Physics MCQs

Solved Physics MCQs with answers and explanations. Free practice questions for PPSC, FPSC, CSS and other government job exams on FreeSekho.

1. 1. Which of the following is generally a good insulator of electricity?

   1. Rubber ✓
   2. Copper
   3. Silver
   4. Aluminum

2. 2. What is the branch of physics dealing with the study of sound called?

   1. Acoustics ✓
   2. Optics
   3. Kinematics
   4. Thermodynamics

3. 3. What is the SI unit of luminous intensity?

   1. Lumen
   2. Candela ✓
   3. Lux
   4. Watt

4. 4. What is 'sound' in physics?

   1. A form of energy produced by vibrating objects that travels as a wave through a medium ✓
   2. A form of energy that can travel through a complete vacuum
   3. A type of electromagnetic radiation
   4. A measure of temperature

5. 5. What is an 'inclined plane'?

   1. A flat surface set at an angle, used to raise objects with less force over a longer distance ✓
   2. A vertical wall with no slope
   3. A type of electrical circuit
   4. A device used only to measure sound

6. 6. What is 'potential energy'?

   1. The energy stored in an object due to its position or state, such as height above the ground ✓
   2. The energy possessed by an object due to its motion
   3. The total energy lost to heat
   4. The rate at which work is done

7. 7. Why does an ice cube melt faster in a warm room than in a cold room?

   1. Heat flows from the warmer surroundings to the colder ice, and a greater temperature difference speeds up this heat transfer ✓
   2. Ice always melts at the exact same rate regardless of surrounding temperature
   3. Warm rooms actually slow down the melting process
   4. Melting is unrelated to temperature differences

8. 8. What characterizes a 'gas' state of matter, in terms of shape and volume?

   1. It has neither a fixed shape nor a fixed volume; it expands to fill its container ✓
   2. It has a completely fixed shape and fixed volume
   3. It has a fixed shape but no fixed volume
   4. It has a fixed volume but no fixed shape at all times

9. 9. What is the formula for power?

   1. P = W/t (work divided by time) ✓
   2. P = F × d
   3. P = m × a
   4. P = m × v

10. 10. What is the study of heat and its relationship to other forms of energy called?

    1. Thermodynamics ✓
    2. Electrostatics
    3. Optics
    4. Kinematics

11. 11. Which inventor and engineer is well known for his contributions to the design of the modern alternating current (AC) electricity supply system?

    1. Nikola Tesla ✓
    2. Thomas Edison
    3. Michael Faraday
    4. Alexander Graham Bell

12. 12. What is a 'molecule'?

    1. A group of two or more atoms bonded together ✓
    2. A single, isolated proton
    3. A unit of electric charge
    4. A unit of measurement for temperature

13. 13. Where are electrons typically found in an atom?

    1. Orbiting around the nucleus in energy levels (shells) ✓
    2. Inside the nucleus, alongside protons
    3. Inside the nucleus, alongside neutrons
    4. Completely outside the atom, unattached

14. 14. Why does a hot air balloon rise into the air?

    1. Hot air inside the balloon is less dense than the surrounding cooler air, creating an upward buoyant force ✓
    2. Hot air is always heavier than cold air
    3. The balloon material generates its own upward force
    4. The balloon rises due to magnetic repulsion from the Earth

15. 15. What is the SI unit of frequency?

    1. Hertz ✓
    2. Joule
    3. Newton
    4. Watt

16. 16. What is the SI unit of electrical resistance?

    1. Ohm ✓
    2. Volt
    3. Ampere
    4. Watt

17. 17. Who is considered the founder of classical mechanics, having also made major contributions to optics and mathematics (including calculus)?

    1. Isaac Newton ✓
    2. Galileo Galilei
    3. Albert Einstein
    4. Johannes Kepler

18. 18. What is the electric charge of a neutron?

    1. Neutral (no charge) ✓
    2. Positive
    3. Negative
    4. Both positive and negative

19. 19. What is an 'echo'?

    1. A reflected sound wave that reaches the listener after the original sound ✓
    2. A sound wave that has completely dissipated
    3. The pitch of a sound wave
    4. A sound that cannot be heard by humans

20. 20. Which type of current is typically produced by a standard battery?

    1. Direct Current (DC) ✓
    2. Alternating Current (AC)
    3. Neither AC nor DC
    4. Only static electricity

21. 21. What is the 'law of conservation of energy'?

    1. Energy cannot be created or destroyed, only transformed from one form to another ✓
    2. Energy can be created from nothing under special conditions
    3. Energy is always lost completely in every process
    4. Energy only exists in the form of heat

22. 22. What is 'electromagnetic induction'?

    1. The process of generating an electric current in a conductor by changing the magnetic field around it ✓
    2. The process of generating a magnetic field using only heat
    3. The process of measuring electrical resistance
    4. The process of converting light into electricity only

23. 23. What is a 'lens' in optics?

    1. A transparent optical device that refracts light to converge or diverge it, forming an image ✓
    2. A device that only reflects light
    3. A device used only to measure temperature
    4. A device used only to measure sound

24. 24. What is 'refraction' of light?

    1. The bending of light as it passes from one medium to another with a different density ✓
    2. The bouncing back of light from a surface
    3. The splitting of white light into a spectrum of colors
    4. The complete absorption of light

25. 25. What is the SI unit of work and energy?

    1. Newton
    2. Joule ✓
    3. Watt
    4. Pascal

26. 26. What is a 'scalar quantity'?

    1. A quantity that has only magnitude, no direction ✓
    2. A quantity that has both magnitude and direction
    3. A quantity that has neither magnitude nor direction
    4. A quantity used only in vectors

27. 27. Who is credited with formulating the law of universal gravitation?

    1. Isaac Newton ✓
    2. Albert Einstein
    3. Galileo Galilei
    4. Johannes Kepler

28. 28. What is 'static electricity'?

    1. The buildup of electric charge on the surface of an object, typically due to friction ✓
    2. The continuous flow of electric charge through a conductor
    3. A type of magnetic field
    4. A form of heat energy

29. 29. What is 'reflection' of light?

    1. The bouncing back of light when it hits a surface ✓
    2. The bending of light as it passes from one medium to another
    3. The splitting of light into its component colors
    4. The absorption of light by a surface

30. 30. What is the 'pitch' of a sound related to?

    1. The frequency of the sound wave — higher frequency generally means higher pitch ✓
    2. The loudness of the sound
    3. The speed of the sound
    4. The distance the sound has traveled

31. 31. Who is Ohm's Law named after?

    1. Georg Simon Ohm ✓
    2. Isaac Newton
    3. Michael Faraday
    4. James Clerk Maxwell

32. 32. What is 'myopia' (nearsightedness) in relation to vision?

    1. A condition where distant objects appear blurry because the eye focuses light in front of the retina, often corrected with a concave lens ✓
    2. A condition where all objects appear equally clear at all distances
    3. A condition of complete blindness
    4. A condition affecting only hearing

33. 33. At what temperature does water boil on the Celsius scale (at standard atmospheric pressure)?

    1. 100°C ✓
    2. 0°C
    3. 212°C
    4. 32°C

34. 34. What is the direction of the Earth's magnetic field commonly used for in a compass?

    1. To indicate geographic direction, as the compass needle aligns with the Earth's magnetic poles ✓
    2. To measure temperature
    3. To measure electrical resistance
    4. To measure sound frequency

35. 35. What is a common everyday example of an inclined plane?

    1. A ramp ✓
    2. A light bulb
    3. A battery
    4. A thermometer

36. 36. What is the difference between distance and displacement?

    1. Distance is the total path length traveled, while displacement is the shortest straight-line distance from start to end point ✓
    2. They are exactly the same thing
    3. Distance is a vector, and displacement is a scalar
    4. Displacement is always greater than distance

37. 37. After which physicist are 'bosons' (a class of subatomic particles) named, in recognition of his contributions to quantum statistics?

    1. Satyendra Nath Bose ✓
    2. C.V. Raman
    3. Niels Bohr
    4. Max Planck

38. 38. What type of electromagnetic radiation is used in medical imaging to see inside the human body, such as for broken bones?

    1. X-rays ✓
    2. Radio waves
    3. Infrared radiation
    4. Visible light

39. 39. What is 'diffraction' of light?

    1. The bending of light waves around obstacles or through small openings ✓
    2. The bouncing of light off a smooth surface
    3. The complete absorption of light
    4. The splitting of white light into colors using a prism specifically

40. 40. What is the 'mass number' of an atom?

    1. The total number of protons and neutrons in the nucleus ✓
    2. The number of protons only
    3. The number of electrons only
    4. The number of electron shells

41. 41. What is 'uniformly accelerated motion'?

    1. Motion in which the velocity of an object changes at a constant rate over time ✓
    2. Motion at a constant, unchanging velocity
    3. Motion with no velocity at all
    4. Motion only in a circular path

42. 42. What happens to most substances when they are heated, in terms of volume?

    1. They generally expand (thermal expansion) ✓
    2. They always contract
    3. Their volume remains completely unchanged
    4. They always turn into gas immediately

43. 43. What is 'Bernoulli's Principle' primarily concerned with?

    1. The relationship between the speed of a fluid and its pressure — as fluid speed increases, its pressure decreases ✓
    2. The relationship between mass and energy
    3. The relationship between force and acceleration
    4. The relationship between heat and temperature

44. 44. What is 'ultrasound' (or ultrasonic waves)?

    1. Sound waves with frequencies higher than the upper limit of human hearing (above about 20,000 Hz) ✓
    2. Sound waves with frequencies lower than human hearing
    3. A type of light wave
    4. A type of radio wave

45. 45. Which of the following is an example of a scalar quantity?

    1. Mass ✓
    2. Velocity
    3. Force
    4. Displacement

46. 46. What is the 'law of conservation of angular momentum'?

    1. The total angular momentum of a system remains constant if no external torque acts on it ✓
    2. Angular momentum is always lost in rotational motion
    3. Angular momentum can be created without any cause
    4. Angular momentum applies only to linear motion

47. 47. What characterizes a 'liquid' state of matter, in terms of shape and volume?

    1. It has no fixed shape (it takes the shape of its container) but has a fixed volume ✓
    2. It has a completely fixed shape and fixed volume
    3. It has neither a fixed shape nor a fixed volume
    4. It has a fixed shape but no volume

48. 48. What is the approximate value of the acceleration due to gravity on Earth's surface?

    1. 9.8 m/s² ✓
    2. 8.9 m/s²
    3. 10.8 m/s²
    4. 6.7 m/s²

49. 49. Who is credited with the discovery of the neutron?

    1. James Chadwick ✓
    2. J.J. Thomson
    3. Ernest Rutherford
    4. Niels Bohr

50. 50. Why does a metal spoon left in a hot cup of tea become hot itself?

    1. Heat is transferred through the spoon by conduction ✓
    2. Heat is transferred only by radiation in this case
    3. The spoon generates its own heat independently
    4. Heat transfer requires no medium in this case

51. 51. What is the function of a 'generator'?

    1. To convert mechanical energy into electrical energy ✓
    2. To convert electrical energy into mechanical energy
    3. To store electrical charge
    4. To measure electrical resistance

52. 52. Who proposed the nuclear model of the atom, in which a small, dense, positively charged nucleus is surrounded by electrons?

    1. Ernest Rutherford ✓
    2. John Dalton
    3. J.J. Thomson
    4. Niels Bohr

53. 53. What is 'lightning' an example of, in terms of electrical phenomena?

    1. A massive natural discharge of static electricity between clouds or between a cloud and the ground ✓
    2. A steady flow of current through a wire
    3. A type of magnetic field only
    4. A type of sound wave

54. 54. What natural phenomenon is a common example of the dispersion of sunlight, forming a colorful arc in the sky?

    1. A rainbow ✓
    2. A shadow
    3. An eclipse
    4. A mirage

55. 55. What is 'conduction' as a method of heat transfer?

    1. The transfer of heat through direct contact between particles, typically in solids ✓
    2. The transfer of heat through the movement of fluid (liquid or gas)
    3. The transfer of heat through electromagnetic waves without a medium
    4. The transfer of heat only in a vacuum

56. 56. What is 'total internal reflection'?

    1. A phenomenon where light traveling in a denser medium is completely reflected internally at the boundary with a less dense medium, if the angle of incidence exceeds a critical angle ✓
    2. The complete absorption of light by any surface
    3. The bending of light as it enters a new medium
    4. The splitting of light into a color spectrum

57. 57. What instrument is used to measure electrical potential difference (voltage)?

    1. Voltmeter ✓
    2. Ammeter
    3. Ohmmeter
    4. Barometer

58. 58. Which Pakistani physicist won the Nobel Prize in Physics in 1979 for his contribution to the electroweak unification theory?

    1. Abdus Salam ✓
    2. Abdul Qadeer Khan
    3. C.V. Raman
    4. Homi J. Bhabha

59. 59. What is the electric charge of a proton?

    1. Positive ✓
    2. Negative
    3. Neutral (no charge)
    4. Both positive and negative

60. 60. What causes the bending of light during refraction?

    1. A change in the speed of light as it moves between media of different densities ✓
    2. A change in the color of the light
    3. A change in the source of the light
    4. The complete absorption of the light wave

61. 61. Which of the following is generally a good conductor of heat?

    1. Metal (such as copper) ✓
    2. Wood
    3. Plastic
    4. Rubber

62. 62. What instrument is used to measure electric current?

    1. Ammeter ✓
    2. Voltmeter
    3. Ohmmeter
    4. Barometer

63. 63. Why does a helium-filled balloon rise in air while an air-filled balloon of the same size does not?

    1. Helium is less dense than the surrounding air, creating a net upward buoyant force ✓
    2. Helium is heavier than air, making the balloon sink
    3. The balloon material itself determines whether it rises or falls, not the gas inside
    4. Air-filled balloons always rise higher than helium balloons

64. 64. Why can we see our reflection clearly in a plane (flat) mirror?

    1. Because light reflects off the smooth surface of the mirror in a regular, predictable pattern ✓
    2. Because the mirror absorbs all the light that hits it
    3. Because the mirror generates its own light
    4. Because the mirror refracts light instead of reflecting it

65. 65. What is 'energy' defined as?

    1. The capacity to do work ✓
    2. The force applied to an object
    3. The rate of change of velocity
    4. The mass of an object

66. 66. What instrument is used to measure length very precisely, often to a fraction of a millimetre?

    1. Vernier calipers ✓
    2. Thermometer
    3. Barometer
    4. Ammeter

67. 67. What is 'radiation' as a method of heat transfer?

    1. The transfer of heat through electromagnetic waves, which can travel through a vacuum ✓
    2. The transfer of heat only through direct contact
    3. The transfer of heat only through fluid movement
    4. The transfer of heat only in solids

68. 68. What is 'temperature' a measure of?

    1. The average kinetic energy of the particles in a substance ✓
    2. The total heat energy contained in an object
    3. The pressure exerted by a substance
    4. The density of a substance

69. 69. Which scientist's law relates the volume of a gas to its temperature at constant pressure?

    1. Jacques Charles (Charles's Law) ✓
    2. Robert Boyle
    3. Isaac Newton
    4. Albert Einstein

70. 70. What natural process powers the Sun and most stars?

    1. Nuclear fusion (primarily of hydrogen into helium) ✓
    2. Nuclear fission
    3. Simple combustion (burning)
    4. Chemical oxidation

71. 71. What is the formula for gravitational potential energy?

    1. PE = mgh ✓
    2. PE = 1/2 mv²
    3. PE = ma
    4. PE = Fd

72. 72. What is the approximate speed of light in a vacuum?

    1. About 300,000 kilometres per second (3 × 10^8 m/s) ✓
    2. About 343 metres per second
    3. About 3,000 kilometres per second
    4. About 3 kilometres per second

73. 73. What is 'work' defined as in physics?

    1. The product of force applied to an object and the displacement in the direction of that force ✓
    2. The rate at which energy is used
    3. The capacity of a body to do work
    4. The resistance of an object to motion

74. 74. What is 'atomic mass' commonly measured in?

    1. Atomic mass units (amu) ✓
    2. Kilograms only
    3. Litres
    4. Newtons

75. 75. In which year did Abdus Salam receive the Nobel Prize in Physics?

    1. 1979 ✓
    2. 1969
    3. 1989
    4. 1999

76. 76. Why do objects appear to weigh less (or become weightless) in outer space, far from any large celestial body?

    1. Because the gravitational force from nearby massive bodies (like Earth) becomes negligible at that distance, or objects are in a state of continuous free-fall (as in orbit) ✓
    2. Because there is no matter at all in outer space
    3. Because objects in space have no mass whatsoever
    4. Because gravity does not exist anywhere in the universe

77. 77. What are the two poles of a magnet commonly called?

    1. North pole and South pole ✓
    2. Positive pole and Negative pole
    3. Upper pole and Lower pole
    4. Left pole and Right pole

78. 78. What is 'viscosity' a measure of?

    1. A fluid's resistance to flow ✓
    2. A solid's resistance to melting
    3. A gas's resistance to compression
    4. The color of a substance

79. 79. What is 'melting point'?

    1. The temperature at which a solid changes into a liquid ✓
    2. The temperature at which a liquid changes into a gas
    3. The temperature at which a gas changes into a liquid
    4. The temperature at which a substance freezes

80. 80. Which physicist proposed the Bohr model of the atom, with electrons orbiting the nucleus in specific energy levels?

    1. Niels Bohr ✓
    2. Ernest Rutherford
    3. J.J. Thomson
    4. John Dalton

81. 81. What is the fixed point around which a lever pivots called?

    1. The fulcrum ✓
    2. The axle
    3. The wedge
    4. The screw thread

82. 82. What is a 'semiconductor'?

    1. A material with electrical conductivity between that of a conductor and an insulator, such as silicon ✓
    2. A material that always conducts electricity perfectly
    3. A material that never conducts electricity under any condition
    4. A material used only for magnetic applications

83. 83. Why does a person's voice sound different when played back on a recording compared to how they hear it while speaking?

    1. While speaking, a person hears their voice partly through bone conduction, in addition to sound traveling through air, which is not captured the same way in a recording ✓
    2. Recording devices always change the pitch of a voice significantly
    3. Sound waves cannot be recorded accurately at all
    4. The human ear cannot process any sound above a whisper

84. 84. What allows a submarine to submerge and resurface in water?

    1. Adjusting its buoyancy by controlling the amount of water in its ballast tanks ✓
    2. Using only its engines to push it downward or upward
    3. Changing the salinity of the surrounding water
    4. Using magnets to attract or repel from the seafloor

85. 85. What does Newton's Third Law of Motion state?

    1. For every action, there is an equal and opposite reaction ✓
    2. Force equals mass times acceleration
    3. An object in motion stays in motion unless acted upon
    4. Energy cannot be created or destroyed

86. 86. In a series circuit, what happens to the current at every point in the circuit?

    1. The current remains the same throughout the circuit ✓
    2. The current increases at each component
    3. The current decreases to zero after each component
    4. The current is different at every single point

87. 87. What is 'friction'?

    1. A force that opposes the relative motion between two surfaces in contact ✓
    2. A force that always increases the speed of an object
    3. The force of gravity acting on an object
    4. The energy stored in a compressed spring

88. 88. Who formulated the three laws of motion?

    1. Isaac Newton ✓
    2. Albert Einstein
    3. Galileo Galilei
    4. James Clerk Maxwell

89. 89. What are the three common temperature scales used to measure temperature?

    1. Celsius, Fahrenheit, and Kelvin ✓
    2. Metre, Litre, and Gram
    3. Newton, Joule, and Watt
    4. Volt, Ampere, and Ohm

90. 90. What is a 'simple machine'?

    1. A basic mechanical device that changes the direction or magnitude of a force to make work easier ✓
    2. A complex electronic device with many moving parts
    3. A device that generates energy from nothing
    4. A device used only to measure temperature

91. 91. What is another common name for Newton's First Law of Motion?

    1. The Law of Inertia ✓
    2. The Law of Action-Reaction
    3. The Law of Gravitation
    4. The Law of Conservation of Energy

92. 92. What is the SI unit of temperature?

    1. Celsius
    2. Fahrenheit
    3. Kelvin ✓
    4. Rankine

93. 93. Which physicist is known for his contributions to electromagnetism, including Maxwell's equations that describe electric and magnetic fields?

    1. James Clerk Maxwell ✓
    2. Michael Faraday
    3. Isaac Newton
    4. Albert Einstein

94. 94. What are the six classical simple machines commonly identified in physics?

    1. Lever, wheel and axle, pulley, inclined plane, wedge, and screw ✓
    2. Only the lever and the pulley
    3. Computer, telephone, television, radio, camera, and clock
    4. Battery, generator, motor, transformer, wire, and switch

95. 95. What is 'absolute zero' on the Kelvin scale?

    1. 0 Kelvin, the theoretical temperature at which particles have minimal thermal motion ✓
    2. 100 Kelvin
    3. 273 Kelvin
    4. -273 Kelvin

96. 96. What is a material that resists the flow of heat called?

    1. An insulator ✓
    2. A conductor
    3. A semiconductor
    4. A superconductor

97. 97. What is the difference between mass and weight?

    1. Mass is the amount of matter in an object and remains constant, while weight is the force of gravity on that mass and can vary ✓
    2. Mass and weight are exactly the same thing everywhere
    3. Weight is constant everywhere while mass varies
    4. Mass is measured in Newtons and weight in kilograms

98. 98. What is 'infrasound'?

    1. Sound waves with frequencies lower than the lower limit of human hearing (below about 20 Hz) ✓
    2. Sound waves with frequencies higher than human hearing
    3. A type of light wave
    4. A type of visible sound

99. 99. What does the Second Law of Thermodynamics generally state regarding heat flow?

    1. Heat naturally flows from a hotter object to a colder one, not the reverse, without external work ✓
    2. Heat always flows from cold objects to hot objects spontaneously
    3. Heat can never be transferred between objects
    4. Heat only flows in a vacuum

100. 100. Who developed the three laws of planetary motion, describing the orbits of planets around the Sun?

     1. Johannes Kepler ✓
     2. Galileo Galilei
     3. Isaac Newton
     4. Nicolaus Copernicus

101. 101. What is the main reason for using a grounding (earthing) wire in electrical appliances?

     1. To provide a safe path for excess electric current to flow into the ground, reducing the risk of electric shock ✓
     2. To increase the voltage supplied to the appliance
     3. To generate additional electricity for the appliance
     4. To make the appliance lighter in weight

102. 102. What is an 'insulator' of electricity?

     1. A material that strongly resists or blocks the flow of electric current, such as rubber or glass ✓
     2. A material that allows electric current to flow through it easily
     3. A material used only to generate electricity
     4. A material that has zero resistance

103. 103. What instrument is used to measure atmospheric pressure?

     1. Barometer ✓
     2. Thermometer
     3. Ammeter
     4. Voltmeter

104. 104. What is the 'law of conservation of momentum'?

     1. The total momentum of an isolated system remains constant if no external force acts on it ✓
     2. Momentum is always destroyed in a collision
     3. Momentum can be created from nothing
     4. Momentum only applies to objects at rest

105. 105. Which Italian-American physicist is known for creating the first controlled nuclear chain reaction?

     1. Enrico Fermi ✓
     2. J. Robert Oppenheimer
     3. Albert Einstein
     4. Niels Bohr

106. 106. What is 'density' defined as?

     1. Mass per unit volume of a substance ✓
     2. Weight per unit area of a substance
     3. Volume per unit mass of a substance
     4. Force per unit area of a substance

107. 107. What is a 'lever' used for?

     1. To amplify an input force to provide a greater output force, or to change its direction, using a fixed point called a fulcrum ✓
     2. To generate electricity from mechanical motion
     3. To measure the temperature of an object
     4. To store electrical charge

108. 108. How many fundamental (base) quantities are there in the SI system?

     1. 5
     2. 6
     3. 7 ✓
     4. 8

109. 109. What is 'terminal velocity'?

     1. The constant maximum velocity reached by an object falling through a fluid (like air) when the force of gravity is balanced by resistance ✓
     2. The initial velocity of an object at the start of its motion
     3. The velocity of an object at the exact moment it stops
     4. The velocity of light in a vacuum

110. 110. Which type of radioactive radiation (alpha, beta, or gamma) generally has the greatest penetrating power?

     1. Gamma radiation ✓
     2. Alpha radiation
     3. Beta radiation
     4. All three have identical penetrating power

111. 111. What is 'radioactivity'?

     1. The spontaneous emission of radiation from the nucleus of an unstable atom ✓
     2. The controlled generation of electricity from a battery
     3. The reflection of light off a surface
     4. The process of chemical bonding between atoms

112. 112. What physical principle allows an airplane wing to generate lift as air flows over and under it?

     1. Bernoulli's Principle (relating to differences in air pressure and speed) ✓
     2. Newton's Third Law alone
     3. Archimedes' Principle
     4. Ohm's Law

113. 113. What is 'projectile motion'?

     1. The motion of an object thrown into the air, subject to gravity, following a curved (parabolic) path ✓
     2. The motion of an object moving in a perfectly straight line at constant speed
     3. The motion of an object that remains stationary
     4. The motion of an object only along a vertical axis

114. 114. What causes the phenomenon of a mirage, such as the appearance of water on a hot road in the distance?

     1. The refraction (bending) of light due to layers of air at different temperatures and densities near the ground ✓
     2. The actual presence of water that then disappears
     3. A reflection of clouds onto the road surface
     4. An optical illusion caused entirely by the color of the road

115. 115. Why does a compass needle point roughly toward the geographic North?

     1. Because it aligns itself with the Earth's magnetic field, which is roughly aligned with the geographic poles ✓
     2. Because it is attracted to the Sun
     3. Because it is repelled by the Earth's core
     4. Because it points toward the nearest large city

116. 116. Which scientist's experiments with electromagnetic induction laid the groundwork for the electric generator and transformer?

     1. Michael Faraday ✓
     2. James Clerk Maxwell
     3. Georg Simon Ohm
     4. Nikola Tesla

117. 117. What is 'Archimedes' Principle'?

     1. A body submerged in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced ✓
     2. Objects always sink in water regardless of density
     3. Pressure in a fluid is the same at all depths
     4. Force equals mass times acceleration

118. 118. What is the SI unit of pressure?

     1. Newton
     2. Joule
     3. Pascal ✓
     4. Watt

119. 119. Which type of current is typically supplied to homes through the electrical grid?

     1. Alternating Current (AC) ✓
     2. Direct Current (DC) only
     3. Neither AC nor DC
     4. Only static electricity

120. 120. Which scientist is often credited as the 'father of the atomic bomb' for his leadership of the Manhattan Project?

     1. J. Robert Oppenheimer ✓
     2. Albert Einstein
     3. Niels Bohr
     4. Enrico Fermi

121. 121. Why does thunder appear to come after lightning during a storm, even though they occur at nearly the same time?

     1. Light travels much faster than sound, so the flash of lightning is seen before the sound of thunder is heard ✓
     2. Sound always travels faster than light
     3. Lightning and thunder occur at completely different, unrelated times
     4. Thunder is generated well after lightning strikes the ground

122. 122. What is 'matter' generally defined as in physics?

     1. Anything that has mass and occupies space (volume) ✓
     2. Only substances that can be seen with the naked eye
     3. Only liquids and gases
     4. A form of energy with no mass

123. 123. Why is the sky blue during a clear day?

     1. Because shorter (blue) wavelengths of sunlight are scattered more by the gases and particles in Earth's atmosphere ✓
     2. Because the sky itself is naturally colored blue with no light involved
     3. Because blue light is absorbed more than other colors
     4. Because the ocean's color is reflected onto the sky

124. 124. What is the difference between 'alternating current' (AC) and 'direct current' (DC)?

     1. AC periodically reverses direction, while DC flows steadily in one direction only ✓
     2. AC and DC are exactly the same thing
     3. DC periodically reverses direction while AC flows in one direction
     4. AC can only be generated by batteries

125. 125. What is 'torque'?

     1. A measure of the rotational force applied to an object, causing it to rotate about an axis ✓
     2. The linear force applied to an object
     3. The energy stored in a rotating object
     4. The mass of a rotating object

126. 126. What is a 'screw' as a simple machine?

     1. An inclined plane wrapped around a cylinder, used to fasten materials together or lift objects ✓
     2. A straight rod with no threads
     3. A type of pulley system with multiple wheels
     4. A device used only to measure pressure

127. 127. Which scientist is considered a founder of quantum theory, having introduced the concept of energy quanta?

     1. Max Planck ✓
     2. Isaac Newton
     3. Albert Einstein
     4. Michael Faraday

128. 128. What is the electric charge of an electron?

     1. Negative ✓
     2. Positive
     3. Neutral (no charge)
     4. Both positive and negative

129. 129. What is the principle behind the functioning of optical fibers, commonly used in telecommunications?

     1. Total internal reflection ✓
     2. Simple reflection only
     3. Dispersion of light
     4. Diffraction of light

130. 130. At what temperature does water boil on the Fahrenheit scale (at standard atmospheric pressure)?

     1. 212°F ✓
     2. 100°F
     3. 32°F
     4. 0°F

131. 131. What is a 'wedge' as a simple machine?

     1. A tool with two inclined planes joined together, used to split or cut objects, such as an axe ✓
     2. A wheel that rotates around an axle
     3. A device used to generate electricity
     4. A type of lever with three fixed points

132. 132. Why does a straight stick appear bent when partially submerged in water?

     1. Due to the refraction of light as it passes from water into air (different densities) ✓
     2. Due to the reflection of light off the water's surface only
     3. Because the stick physically bends when wet
     4. Due to the dispersion of light into colors

133. 133. Which physicist developed a famous thought experiment involving a cat, used to illustrate concepts in quantum superposition?

     1. Erwin Schrödinger ✓
     2. Werner Heisenberg
     3. Niels Bohr
     4. Max Planck

134. 134. Does sound require a medium (such as air, water, or a solid) to travel through?

     1. Yes, sound requires a medium and cannot travel through a vacuum ✓
     2. No, sound can travel through a complete vacuum
     3. Sound only travels through solids
     4. Sound only travels through liquids

135. 135. What is the SI unit of electrical potential difference (voltage)?

     1. Ampere
     2. Volt ✓
     3. Ohm
     4. Watt

136. 136. What does Hooke's Law state, in simple terms?

     1. The extension of a spring is directly proportional to the force applied to it, within its elastic limit ✓
     2. A spring always returns to double its original length
     3. Springs cannot be compressed, only stretched
     4. Force applied to a spring is always constant

137. 137. What is a material that allows heat to pass through it easily called?

     1. A conductor ✓
     2. An insulator
     3. A semiconductor
     4. A superconductor

138. 138. Who is known as the 'father of modern physics'?

     1. Galileo Galilei (or in some contexts, Albert Einstein) ✓
     2. Isaac Newton
     3. Aristotle
     4. Charles Darwin

139. 139. Which Italian scientist is credited with significant contributions to the study of motion and improvements to the telescope, and famously supported the heliocentric model?

     1. Galileo Galilei ✓
     2. Isaac Newton
     3. Nicolaus Copernicus
     4. Johannes Kepler

140. 140. What is the difference between a 'series circuit' and a 'parallel circuit'?

     1. In a series circuit, components are connected end-to-end in a single path; in a parallel circuit, components are connected across multiple paths ✓
     2. There is no difference between the two types of circuits
     3. A series circuit always has more resistance paths than a parallel circuit
     4. A parallel circuit can only have one component

141. 141. What is the mathematical formula for Newton's Second Law of Motion?

     1. F = ma ✓
     2. E = mc²
     3. F = mv
     4. P = mv

142. 142. What is 'convection' as a method of heat transfer?

     1. The transfer of heat through the movement of fluid particles (liquids or gases) ✓
     2. The transfer of heat through direct contact in solids only
     3. The transfer of heat through electromagnetic waves without a medium
     4. The transfer of heat only through metals

143. 143. What is 'electrical resistance'?

     1. The opposition offered by a material to the flow of electric current ✓
     2. The total flow of electric charge
     3. The stored electric charge in a capacitor
     4. The rate at which electrical energy is used

144. 144. What is a 'pulley' used for?

     1. To change the direction of a force, often used to lift heavy loads more easily ✓
     2. To generate heat energy
     3. To measure electrical resistance
     4. To store chemical energy

145. 145. What is the SI unit of power?

     1. Joule
     2. Newton
     3. Watt ✓
     4. Pascal

146. 146. What is 'specific heat capacity'?

     1. The amount of heat required to raise the temperature of a unit mass of a substance by one degree ✓
     2. The total heat contained in an object
     3. The temperature at which a substance melts
     4. The rate at which heat is transferred

147. 147. What is 'alpha radiation' composed of?

     1. Two protons and two neutrons (equivalent to a helium nucleus) ✓
     2. High-energy electrons
     3. High-energy electromagnetic waves with no mass
     4. Neutrons only

148. 148. What is the SI unit of frequency for sound and other waves?

     1. Hertz (Hz) ✓
     2. Decibel (dB)
     3. Metre (m)
     4. Watt (W)

149. 149. What type of electromagnetic radiation is commonly associated with sunburn and is filtered by the ozone layer?

     1. Ultraviolet (UV) radiation ✓
     2. Infrared radiation
     3. Radio waves
     4. Microwaves

150. 150. What is the term for the branch of physics that studies forces and their effect on motion?

     1. Dynamics ✓
     2. Kinematics
     3. Optics
     4. Acoustics

151. 151. What physical principle explains why a ship made of steel, which is denser than water, can still float?

     1. Archimedes' Principle (buoyancy based on the weight of displaced water, related to the ship's overall shape and volume) ✓
     2. Bernoulli's Principle
     3. Newton's First Law
     4. Ohm's Law

152. 152. What instrument is used to measure temperature?

     1. Thermometer ✓
     2. Barometer
     3. Hygrometer
     4. Ammeter

153. 153. What does Newton's First Law of Motion describe?

     1. An object remains at rest or in uniform motion unless acted upon by an external force (law of inertia) ✓
     2. Force equals mass times acceleration
     3. Every action has an equal and opposite reaction
     4. Energy cannot be created or destroyed

154. 154. What is the formula for work done?

     1. W = F × d (force times displacement) ✓
     2. W = m × a
     3. W = m × v
     4. W = F × t

155. 155. What are the three main types of radioactive decay/radiation commonly discussed in basic physics?

     1. Alpha, beta, and gamma radiation ✓
     2. Infrared, ultraviolet, and visible radiation
     3. Sound, heat, and light radiation
     4. Positive, negative, and neutral radiation

156. 156. Who proposed the heliocentric (Sun-centered) model of the solar system, challenging the earlier geocentric view?

     1. Nicolaus Copernicus ✓
     2. Galileo Galilei
     3. Johannes Kepler
     4. Isaac Newton

157. 157. What does Charles's Law state about a gas at constant pressure?

     1. The volume of a gas is directly proportional to its absolute temperature ✓
     2. The volume of a gas is inversely proportional to its temperature
     3. The volume of a gas is unrelated to temperature
     4. The pressure of a gas always remains constant regardless of volume

158. 158. What is 'surface tension' a property of, primarily?

     1. Liquids, referring to the tendency of their surface to behave like a stretched elastic sheet ✓
     2. Solids only
     3. Gases only
     4. Plasma only

159. 159. What is the SI unit of magnetic flux density?

     1. Tesla ✓
     2. Weber
     3. Henry
     4. Farad

160. 160. What is 'light' in physics?

     1. A form of electromagnetic radiation that is visible to the human eye ✓
     2. A form of sound energy
     3. A form of heat energy only
     4. A type of magnetic field

161. 161. Which of the following is an example of a vector quantity?

     1. Distance
     2. Speed
     3. Displacement ✓
     4. Time

162. 162. What is 'acceleration' defined as?

     1. The rate of change of velocity with respect to time ✓
     2. The rate of change of distance with respect to time
     3. The total distance traveled by an object
     4. The force applied to an object

163. 163. What type of electromagnetic radiation is commonly used in remote controls and thermal imaging, associated with heat?

     1. Infrared radiation ✓
     2. Ultraviolet radiation
     3. Gamma rays
     4. Radio waves

164. 164. What did Albert Einstein's famous equation E = mc² describe?

     1. The equivalence of mass and energy ✓
     2. The relationship between force and acceleration
     3. The relationship between voltage and current
     4. The relationship between pressure and volume

165. 165. What is the formula relating voltage, current, and resistance, known as Ohm's Law?

     1. V = IR (Voltage = Current × Resistance) ✓
     2. V = I/R
     3. V = I + R
     4. V = I - R

166. 166. Which type of electromagnetic wave has the shortest wavelength and highest energy?

     1. Gamma rays ✓
     2. Radio waves
     3. Visible light
     4. Infrared waves

167. 167. What is an 'electromagnet'?

     1. A magnet created by passing an electric current through a coil of wire, often wrapped around an iron core ✓
     2. A permanent magnet that never loses its magnetism
     3. A magnet that only works using heat
     4. A magnet found only in nature

168. 168. What is the 'frequency' of a sound wave?

     1. The number of vibrations (or wave cycles) occurring per second ✓
     2. The loudness of the sound
     3. The speed at which the sound travels
     4. The distance the sound travels

169. 169. What does 'buoyancy' refer to?

     1. The upward force exerted by a fluid that opposes the weight of an object immersed in it ✓
     2. The downward force of gravity on an object
     3. The resistance of a surface to sliding motion
     4. The capacity of an object to conduct heat

170. 170. What is the physics principle behind the functioning of a simple see-saw?

     1. The principle of the lever, balancing torque on either side of a central pivot (fulcrum) ✓
     2. The principle of buoyancy
     3. The principle of electromagnetic induction
     4. The principle of nuclear fission

171. 171. What is 'pressure' defined as?

     1. Force applied per unit area ✓
     2. Mass per unit volume
     3. The rate of change of velocity
     4. The capacity to do work

172. 172. What is the term for the branch of physics that studies the motion of objects without considering the forces causing the motion?

     1. Kinematics ✓
     2. Dynamics
     3. Statics
     4. Thermodynamics

173. 173. At what temperature does water freeze on the Fahrenheit scale?

     1. 32°F ✓
     2. 0°F
     3. 100°F
     4. 212°F

174. 174. What does Newton's Second Law of Motion state?

     1. Force equals mass multiplied by acceleration (F = ma) ✓
     2. For every action, there is an equal and opposite reaction
     3. An object at rest stays at rest unless acted upon
     4. Energy is conserved in a closed system

175. 175. What is the formula for momentum?

     1. p = mv ✓
     2. F = ma
     3. E = mc²
     4. W = Fd

176. 176. What is the purpose of a 'wheel and axle' as a simple machine?

     1. To reduce the force needed to move an object by rotating a larger wheel connected to a smaller axle ✓
     2. To generate electrical energy directly
     3. To measure the speed of light
     4. To convert heat into light

177. 177. What is 'nuclear fission'?

     1. The splitting of a heavy atomic nucleus into two or more smaller nuclei, releasing energy ✓
     2. The combining of two light nuclei to form a heavier nucleus
     3. The process of chemical bonding between atoms
     4. The emission of light from an atom

178. 178. What type of mirror is commonly used in torches, headlights, and telescopes to focus light?

     1. A concave mirror ✓
     2. A convex mirror
     3. A plane (flat) mirror
     4. None of these

179. 179. What is 'gamma radiation'?

     1. A form of high-energy electromagnetic radiation emitted from the nucleus during radioactive decay ✓
     2. A stream of helium nuclei
     3. A stream of high-speed electrons
     4. A form of sound energy

180. 180. What are the three basic subatomic particles that make up an atom?

     1. Proton, neutron, and electron ✓
     2. Proton, photon, and neutron
     3. Electron, molecule, and neutron
     4. Atom, molecule, and ion

181. 181. What is the formula for density?

     1. Density = Mass / Volume ✓
     2. Density = Volume / Mass
     3. Density = Mass × Volume
     4. Density = Force / Area

182. 182. What is the SI unit of electric current?

     1. Volt
     2. Ampere ✓
     3. Ohm
     4. Watt

183. 183. What is 'evaporation'?

     1. The process by which a liquid changes into vapor at a temperature below its boiling point ✓
     2. The process by which a solid changes directly into a gas
     3. The process by which a gas changes into a liquid
     4. The process by which a liquid freezes into a solid

184. 184. What happens to the magnetic field of an electromagnet when the electric current is switched off?

     1. The magnetic field disappears (or greatly weakens) ✓
     2. The magnetic field becomes permanently stronger
     3. The magnetic field remains completely unchanged
     4. The magnetic field reverses direction permanently

185. 185. What is 'dispersion' of light?

     1. The splitting of white light into its component colors (spectrum) when passed through a medium like a prism ✓
     2. The bouncing of light off a mirror
     3. The complete absorption of light by a black surface
     4. The bending of light in a straight line

186. 186. Who formulated the law of universal gravitation after allegedly observing a falling apple?

     1. Isaac Newton ✓
     2. Albert Einstein
     3. Galileo Galilei
     4. Johannes Kepler

187. 187. What is a 'transformer' used for in electrical systems?

     1. To increase (step up) or decrease (step down) the voltage of alternating current (AC) ✓
     2. To convert AC to DC only
     3. To generate electricity from nothing
     4. To measure electrical resistance

188. 188. Who is credited with the discovery of the electron?

     1. J.J. Thomson ✓
     2. Ernest Rutherford
     3. James Chadwick
     4. Niels Bohr

189. 189. What is 'beta radiation' composed of?

     1. High-energy electrons (or positrons) ✓
     2. Helium nuclei
     3. High-energy electromagnetic waves with no mass
     4. Protons only

190. 190. What is 'inertia'?

     1. The tendency of an object to resist a change in its state of motion ✓
     2. The force that pulls objects toward the Earth
     3. The rate of change of velocity
     4. The capacity to do work

191. 191. What term describes the direct change of a substance from a solid to a gas, without passing through the liquid phase?

     1. Sublimation ✓
     2. Melting
     3. Boiling
     4. Condensation

192. 192. What is the smallest unit of an element that retains the chemical properties of that element?

     1. An atom ✓
     2. A molecule
     3. An electron
     4. A neutron

193. 193. What is a 'concave lens' (diverging lens) generally used for?

     1. To diverge (spread out) light rays, often used to correct nearsightedness ✓
     2. To always converge light rays to a single point
     3. To completely block all light
     4. To measure sound frequency

194. 194. What is 'polarization' of light?

     1. The process of restricting the vibrations of light waves to a single plane ✓
     2. The complete absorption of all light waves
     3. The splitting of light into a color spectrum
     4. The bouncing of light off a rough surface

195. 195. What is the formula for pressure?

     1. Pressure = Force / Area ✓
     2. Pressure = Force × Area
     3. Pressure = Mass / Volume
     4. Pressure = Mass × Acceleration

196. 196. Which of the following is generally a good insulator of heat?

     1. Wood ✓
     2. Copper
     3. Silver
     4. Aluminum

197. 197. Who is credited with the discovery of radioactivity?

     1. Henri Becquerel ✓
     2. Marie Curie
     3. Albert Einstein
     4. Isaac Newton

198. 198. Which of the following is generally a good conductor of electricity?

     1. Copper ✓
     2. Rubber
     3. Glass
     4. Wood

199. 199. What is the SI unit of electric charge?

     1. Ampere
     2. Volt
     3. Coulomb ✓
     4. Ohm

200. 200. What is a 'convex lens' (converging lens) generally used for?

     1. To converge (focus) light rays to a point, often used in magnifying glasses and to correct farsightedness ✓
     2. To always spread light rays apart
     3. To completely block all light
     4. To measure the speed of light

201. 201. What is a 'conductor' of electricity?

     1. A material that allows electric current to flow through it easily, such as most metals ✓
     2. A material that completely blocks the flow of electric current
     3. A material used only to store electric charge
     4. A material that generates its own electric current spontaneously

202. 202. What is the branch of physics that deals with electric charges at rest called?

     1. Electrostatics ✓
     2. Electrodynamics
     3. Optics
     4. Acoustics

203. 203. Why does ice float on water?

     1. Because ice is less dense than liquid water ✓
     2. Because ice is denser than liquid water
     3. Because ice and water have exactly the same density
     4. Because ice contains trapped air bubbles only, unrelated to density

204. 204. What is a fourth state of matter, found in stars and other extremely high-energy environments, consisting of ionized gas?

     1. Plasma ✓
     2. Crystal
     3. Vapor
     4. Colloid

205. 205. What physical principle explains why passengers in a moving vehicle lurch forward when the vehicle suddenly stops?

     1. Inertia (the tendency of a body to resist a change in its state of motion) ✓
     2. Gravity
     3. Friction reduction
     4. Magnetic repulsion

206. 206. What is a 'circuit' in electricity?

     1. A closed path through which electric current can flow ✓
     2. An open path where current cannot flow at all
     3. A type of insulating material
     4. A unit of electrical resistance

207. 207. In a parallel circuit, what happens to the voltage across each parallel branch?

     1. The voltage remains the same across each parallel branch ✓
     2. The voltage decreases progressively across each branch
     3. The voltage is always zero across each branch
     4. The voltage increases infinitely

208. 208. What allows noise-cancelling headphones to reduce unwanted background sound?

     1. They generate sound waves that are the inverse (out of phase) of the ambient noise, causing destructive interference ✓
     2. They physically block all sound from entering the ear completely
     3. They amplify all incoming sound to overpower background noise
     4. They convert sound waves into light waves

209. 209. Which physicist is known for his 'uncertainty principle', stating that certain pairs of properties (like position and momentum) cannot both be precisely known at once?

     1. Werner Heisenberg ✓
     2. Albert Einstein
     3. Niels Bohr
     4. Erwin Schrödinger

210. 210. What are the three primary methods of heat transfer?

     1. Conduction, convection, and radiation ✓
     2. Reflection, refraction, and diffraction
     3. Fusion, fission, and combustion
     4. Evaporation, condensation, and sublimation

211. 211. What is the unit commonly used to measure the loudness (intensity) of sound?

     1. Decibel (dB) ✓
     2. Hertz (Hz)
     3. Watt (W)
     4. Metre (m)

212. 212. What is 'condensation'?

     1. The process by which a gas (vapor) changes into a liquid ✓
     2. The process by which a liquid changes into a gas
     3. The process by which a solid changes into a liquid
     4. The process by which a liquid freezes

213. 213. What is the approximate speed of sound in air at room temperature?

     1. About 343 metres per second ✓
     2. About 3,000 metres per second
     3. About 300,000 kilometres per second
     4. About 34 metres per second

214. 214. What is the First Law of Thermodynamics primarily concerned with?

     1. The conservation of energy — energy cannot be created or destroyed, only converted from one form to another ✓
     2. The direction of heat flow only
     3. The absolute zero temperature
     4. The speed of sound in different mediums

215. 215. What is 'half-life' in the context of radioactive decay?

     1. The time required for half of the radioactive atoms in a sample to decay ✓
     2. The total lifetime of a radioactive substance
     3. The time it takes for a substance to become completely stable
     4. The time required for a substance to double in mass

216. 216. Which physicist developed the theory of general and special relativity?

     1. Albert Einstein ✓
     2. Isaac Newton
     3. Niels Bohr
     4. Max Planck

217. 217. Who is credited with discovering the phenomenon of electromagnetic induction?

     1. Michael Faraday ✓
     2. Isaac Newton
     3. Albert Einstein
     4. Georg Simon Ohm

218. 218. What is the function of an 'electric motor'?

     1. To convert electrical energy into mechanical energy (motion) ✓
     2. To convert mechanical energy into electrical energy
     3. To store electrical charge
     4. To measure voltage

219. 219. What does Boyle's Law state about a gas at constant temperature?

     1. The pressure of a gas is inversely proportional to its volume ✓
     2. The pressure of a gas is directly proportional to its volume
     3. The pressure of a gas is unrelated to its volume
     4. The volume of a gas always remains constant regardless of pressure

220. 220. What is the process called when a solid changes directly into a gas without passing through the liquid state?

     1. Sublimation ✓
     2. Melting
     3. Evaporation
     4. Condensation

221. 221. What are the seven colors of the visible spectrum of light, often remembered by the acronym VIBGYOR?

     1. Violet, Indigo, Blue, Green, Yellow, Orange, Red ✓
     2. Red, Green, Blue only
     3. Black and White only
     4. Violet and Red only

222. 222. What is a 'fuse' used for in an electrical circuit?

     1. To protect the circuit by breaking the connection if the current exceeds a safe level ✓
     2. To increase the voltage in a circuit
     3. To store electric charge
     4. To generate electricity

223. 223. Which type of radioactive radiation generally has the least penetrating power and can be stopped by a sheet of paper?

     1. Alpha radiation ✓
     2. Beta radiation
     3. Gamma radiation
     4. All three have identical penetrating power

224. 224. What instrument is used to measure electrical resistance directly?

     1. Ohmmeter ✓
     2. Voltmeter
     3. Ammeter
     4. Barometer

225. 225. Why do we wear light-colored clothes in summer rather than dark-colored clothes?

     1. Light colors reflect more heat/light and absorb less, keeping the wearer cooler ✓
     2. Dark colors always keep a person cooler than light colors
     3. Clothing color has no effect on heat absorption
     4. Light colors absorb more heat than dark colors

226. 226. What is the SI unit of acceleration?

     1. Metre per second squared (m/s²) ✓
     2. Metre per second (m/s)
     3. Newton (N)
     4. Joule (J)

227. 227. What is the SI unit of time?

     1. Minute
     2. Hour
     3. Second ✓
     4. Day

228. 228. What does the 'c' represent in Einstein's equation E = mc²?

     1. The speed of light in a vacuum ✓
     2. The mass of an electron
     3. The charge of a proton
     4. The specific heat capacity of water

229. 229. What is 'Hooke's Law' related to?

     1. The relationship between the force applied to a spring and the resulting extension or compression, within its elastic limit ✓
     2. The relationship between force and acceleration
     3. The relationship between energy and mass
     4. The relationship between pressure and volume of a gas

230. 230. What is an 'electric cell' (or battery)?

     1. A device that converts chemical energy into electrical energy ✓
     2. A device that converts electrical energy into chemical energy only
     3. A device used only to measure current
     4. A device used only to measure resistance

231. 231. What is 'elasticity' in physics?

     1. The property of a material that allows it to return to its original shape after being deformed by a force ✓
     2. The property of a material to permanently deform under any force
     3. The property of a material to conduct electricity
     4. The property of a material to absorb heat

232. 232. Who is credited with inventing the telephone?

     1. Alexander Graham Bell ✓
     2. Thomas Edison
     3. Guglielmo Marconi
     4. Nikola Tesla

233. 233. What is 'electric current' defined as?

     1. The rate of flow of electric charge through a conductor ✓
     2. The total amount of electric charge stored in an object
     3. The resistance offered by a conductor
     4. The force between two charges

234. 234. Does light require a medium to travel through?

     1. No, light can travel through a vacuum (unlike sound) ✓
     2. Yes, light requires a medium and cannot travel through a vacuum
     3. Light can only travel through solids
     4. Light can only travel through liquids

235. 235. What is the SI unit of mass?

     1. Gram
     2. Kilogram ✓
     3. Pound
     4. Tonne

236. 236. What is the SI unit of force?

     1. Joule
     2. Newton ✓
     3. Watt
     4. Pascal

237. 237. What is a 'prism' commonly used for in optics?

     1. To disperse white light into its component colors (spectrum) ✓
     2. To completely block light from passing through
     3. To measure the speed of sound
     4. To measure temperature

238. 238. What is 'quantum mechanics' broadly concerned with?

     1. The behavior of matter and energy at the atomic and subatomic scale ✓
     2. The motion of large, everyday objects like cars and balls
     3. The study of only electrical circuits
     4. The study of only heat transfer

239. 239. What is the electromagnetic spectrum, in order of increasing wavelength, generally arranged as?

     1. Gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves, radio waves ✓
     2. Only visible light and nothing else
     3. Sound waves, light waves, heat waves
     4. Only radio waves and microwaves

240. 240. What instrument is used to measure humidity in the air?

     1. Hygrometer ✓
     2. Barometer
     3. Thermometer
     4. Ammeter

241. 241. What is the SI unit of velocity?

     1. Metre per second (m/s) ✓
     2. Metre per second squared (m/s²)
     3. Newton (N)
     4. Kilogram (kg)

242. 242. What is the difference between speed and velocity?

     1. Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude and direction) ✓
     2. They are exactly the same thing
     3. Speed is always greater than velocity
     4. Velocity is a scalar and speed is a vector

243. 243. What is 'capillary action'?

     1. The ability of a liquid to flow in narrow spaces without the assistance of external forces like gravity, often against gravity ✓
     2. The process of a liquid boiling rapidly
     3. The process of a gas condensing into a solid directly
     4. The measurement of a liquid's temperature

244. 244. What is 'heat' in physics?

     1. A form of energy that is transferred between objects due to a temperature difference ✓
     2. The measure of how hot or cold an object is
     3. The total kinetic energy of all particles in an object
     4. A type of electromagnetic radiation only

245. 245. At what temperature does water freeze on the Celsius scale?

     1. 0°C ✓
     2. 32°C
     3. 100°C
     4. -273°C

246. 246. Which physicist's law describes the relationship between the pressure and volume of a gas at constant temperature?

     1. Robert Boyle (Boyle's Law) ✓
     2. Isaac Newton
     3. Albert Einstein
     4. James Clerk Maxwell

247. 247. Which type of electromagnetic wave has the longest wavelength and lowest energy?

     1. Radio waves ✓
     2. Gamma rays
     3. X-rays
     4. Ultraviolet rays

248. 248. Who is credited with pioneering long-distance radio transmission and is often called a father of radio?

     1. Guglielmo Marconi ✓
     2. Alexander Graham Bell
     3. Thomas Edison
     4. James Clerk Maxwell

249. 249. What is 'boiling point'?

     1. The temperature at which a liquid changes into a gas (vapor) ✓
     2. The temperature at which a solid changes into a liquid
     3. The temperature at which a gas changes into a liquid
     4. The temperature at which a substance sublimates

250. 250. What part of the human eye controls the amount of light entering the eye?

     1. The iris (which adjusts the size of the pupil) ✓
     2. The retina
     3. The cornea
     4. The optic nerve

251. 251. What is the SI unit of capacitance?

     1. Farad ✓
     2. Henry
     3. Ohm
     4. Tesla

252. 252. What is the 'atomic number' of an element?

     1. The number of protons in the nucleus of an atom ✓
     2. The number of neutrons in the nucleus of an atom
     3. The total mass of the atom
     4. The number of electron shells in an atom

253. 253. What is the 'law of reflection'?

     1. The angle of incidence is equal to the angle of reflection ✓
     2. The angle of incidence is always greater than the angle of reflection
     3. Light always reflects at a 90-degree angle
     4. Light cannot be reflected by smooth surfaces

254. 254. Which of the following is considered one of the six classical simple machines?

     1. Lever ✓
     2. Computer
     3. Telephone
     4. Battery

255. 255. What is 'nuclear fusion'?

     1. The combining of two light atomic nuclei to form a heavier nucleus, releasing energy ✓
     2. The splitting of a heavy nucleus into smaller parts
     3. A type of chemical reaction only
     4. The process of radioactive decay

256. 256. Which method of heat transfer can occur through a vacuum (empty space), such as heat from the Sun reaching Earth?

     1. Radiation ✓
     2. Conduction
     3. Convection
     4. None of these can occur in a vacuum

257. 257. What are 'isotopes'?

     1. Atoms of the same element with the same number of protons but different numbers of neutrons ✓
     2. Atoms of different elements with the same mass number
     3. Atoms with no neutrons at all
     4. Atoms with no protons at all

258. 258. What is 'gravity'?

     1. The force of attraction between any two masses, notably the force pulling objects toward the Earth ✓
     2. The resistance of an object to motion
     3. The energy stored in an object due to its position
     4. The rate of change of momentum

259. 259. Who proposed the model of the atom in which electrons orbit the nucleus in fixed, quantized energy levels (shells)?

     1. Niels Bohr ✓
     2. Ernest Rutherford
     3. J.J. Thomson
     4. John Dalton

260. 260. What is the 'amplitude' of a sound wave related to?

     1. The loudness (or intensity) of the sound ✓
     2. The pitch of the sound
     3. The speed of the sound
     4. The wavelength of the sound

261. 261. What type of mirror is commonly used as a car's side/rear-view mirror to give a wider field of view?

     1. A convex mirror ✓
     2. A concave mirror
     3. A plane (flat) mirror
     4. A parabolic mirror only

262. 262. Which inventor is widely credited with developing the practical incandescent light bulb?

     1. Thomas Edison ✓
     2. Nikola Tesla
     3. Alexander Graham Bell
     4. Michael Faraday

263. 263. What is the SI unit of amount of substance?

     1. Mole ✓
     2. Gram
     3. Litre
     4. Kilogram

264. 264. What is 0 Kelvin approximately equal to in Celsius?

     1. -273°C ✓
     2. 0°C
     3. 100°C
     4. 273°C

265. 265. Which Indian physicist won the Nobel Prize in Physics in 1930 for his work on the scattering of light, now known as the 'Raman effect'?

     1. C.V. Raman ✓
     2. Homi J. Bhabha
     3. Satyendra Nath Bose
     4. Abdus Salam

266. 266. What is 'weight' in physics?

     1. The force of gravity acting on an object's mass ✓
     2. The amount of matter contained in an object
     3. The resistance of an object to a change in motion
     4. The capacity of an object to do work

267. 267. What are the three common states of matter typically studied at a basic level?

     1. Solid, liquid, and gas ✓
     2. Hot, warm, and cold
     3. Light, medium, and heavy
     4. Fast, slow, and stationary

268. 268. What is an 'electromagnetic wave'?

     1. A wave consisting of oscillating electric and magnetic fields that can travel through a vacuum ✓
     2. A wave that requires a physical medium like air or water to travel
     3. A wave produced only by vibrating strings
     4. A wave used only to transmit sound

269. 269. Why is it generally recommended to let go of an electrical wire quickly rather than gripping it tightly if accidentally touched while live?

     1. Muscle contractions caused by electric current can make it difficult to let go once gripped tightly, increasing exposure to the shock ✓
     2. Electric current has no effect on human muscles
     3. Letting go quickly increases the severity of an electric shock
     4. Gripping tightly always reduces the effect of a shock

270. 270. What is 'Pascal's Principle' (or Pascal's Law)?

     1. A change in pressure applied to an enclosed fluid is transmitted equally throughout the fluid in all directions ✓
     2. Pressure decreases as depth in a fluid increases
     3. Fluids always flow from low pressure to high pressure
     4. Gases cannot be compressed

271. 271. What is a common everyday example of static electricity?

     1. The crackling and clinging of clothes after being removed from a dryer, or hair standing up after rubbing a balloon on it ✓
     2. The steady glow of a light bulb
     3. The flow of water through a river
     4. The reflection of light in a mirror

272. 272. What is the SI unit of inductance?

     1. Farad
     2. Henry ✓
     3. Ohm
     4. Tesla

273. 273. Who developed the theory of relativity, including the famous equation E = mc²?

     1. Albert Einstein ✓
     2. Isaac Newton
     3. Niels Bohr
     4. Max Planck

274. 274. What does the term 'free fall' describe?

     1. The motion of an object falling under the influence of gravity alone, with no other forces (like air resistance) acting on it ✓
     2. An object floating motionless in the air
     3. An object moving at a constant horizontal velocity
     4. An object that has come to a complete stop

275. 275. What characterizes a 'solid' state of matter, in terms of shape and volume?

     1. It has a fixed shape and a fixed volume ✓
     2. It has no fixed shape but has a fixed volume
     3. It has neither a fixed shape nor a fixed volume
     4. It has a fixed shape but no volume at all

276. 276. What is an example of a commonly used semiconductor material in electronics?

     1. Silicon ✓
     2. Copper
     3. Rubber
     4. Glass

277. 277. In which medium does sound generally travel fastest?

     1. Solids ✓
     2. Liquids
     3. Gases
     4. A vacuum

278. 278. What is the formula for kinetic energy?

     1. KE = 1/2 mv² ✓
     2. KE = mgh
     3. KE = ma
     4. KE = Fd

279. 279. What is 'hyperopia' (farsightedness) in relation to vision?

     1. A condition where nearby objects appear blurry because the eye focuses light behind the retina, often corrected with a convex lens ✓
     2. A condition where all objects appear equally clear at all distances
     3. A condition of complete blindness
     4. A condition affecting only hearing

280. 280. What is 'escape velocity'?

     1. The minimum speed an object needs to escape the gravitational pull of a celestial body without further propulsion ✓
     2. The maximum speed any object can travel in the universe
     3. The speed of light in a vacuum
     4. The average speed of a falling object on Earth

281. 281. What happens when unlike poles of two magnets (e.g., North and South) are brought close together?

     1. They attract each other ✓
     2. They repel each other
     3. They have no effect on each other
     4. They cancel out each other's magnetism

282. 282. What is the SI unit of length?

     1. Metre ✓
     2. Centimetre
     3. Kilometre
     4. Foot

283. 283. What is 'kinetic energy'?

     1. The energy possessed by an object due to its motion ✓
     2. The energy stored in an object due to its position or state
     3. The total energy of a closed system
     4. The energy lost due to friction

284. 284. What is a 'magnet'?

     1. An object that produces a magnetic field and attracts materials like iron, nickel, and cobalt ✓
     2. An object that repels all types of metal
     3. An object that only conducts heat
     4. An object used only to measure temperature

285. 285. What is 'momentum' defined as?

     1. The product of an object's mass and its velocity ✓
     2. The product of an object's mass and its acceleration
     3. The rate of change of velocity
     4. The capacity of a body to do work

286. 286. What is 'power' defined as in physics?

     1. The rate at which work is done or energy is transferred ✓
     2. The total amount of work done, regardless of time
     3. The force applied to an object
     4. The capacity of an object to store energy

287. 287. What is 'centripetal force'?

     1. The force that acts on an object moving in a circular path, directed toward the center of the circle ✓
     2. A force that pushes objects away from the center of a circular path
     3. A force that only acts on stationary objects
     4. The force of gravity acting vertically

288. 288. What type of electromagnetic wave is used for cooking food quickly in a common kitchen appliance?

     1. Microwaves ✓
     2. Gamma rays
     3. X-rays
     4. Ultraviolet rays

289. 289. Which scientist, along with her husband, conducted pioneering research on radioactivity and discovered the elements polonium and radium?

     1. Marie Curie ✓
     2. Rosalind Franklin
     3. Lise Meitner
     4. Dorothy Hodgkin

290. 290. What is the primary reason a vacuum flask (thermos) keeps liquids hot or cold for extended periods?

     1. It minimizes heat transfer through conduction, convection, and radiation using a vacuum layer and reflective surfaces ✓
     2. It generates its own heat or cold internally
     3. It uses electricity to actively regulate temperature
     4. It relies solely on the color of the liquid inside

291. 291. What is the branch of physics concerned with the equilibrium of forces on stationary bodies called?

     1. Statics ✓
     2. Dynamics
     3. Kinematics
     4. Optics

292. 292. What is a 'vector quantity'?

     1. A quantity that has both magnitude and direction ✓
     2. A quantity that has only magnitude
     3. A quantity that has only direction with no magnitude
     4. A quantity that never changes

293. 293. Why do we feel cooler when standing in front of a fan on a hot day, even though the fan does not cool the air?

     1. The moving air increases the rate of evaporation of sweat from our skin, which has a cooling effect ✓
     2. The fan actually lowers the temperature of the room significantly
     3. The fan generates cold air through a chemical reaction
     4. The fan removes all heat from the body directly through contact

294. 294. What happens when like poles of two magnets (e.g., North and North) are brought close together?

     1. They repel each other ✓
     2. They attract each other
     3. They have no effect on each other
     4. They merge into a single pole

295. 295. What part of the human eye contains light-sensitive cells and forms the image?

     1. The retina ✓
     2. The iris
     3. The pupil
     4. The cornea

296. 296. What is the branch of physics dealing with the study of light called?

     1. Optics ✓
     2. Acoustics
     3. Kinematics
     4. Electrostatics

297. 297. Where are protons and neutrons located within an atom?

     1. In the nucleus (center) of the atom ✓
     2. Orbiting around the nucleus
     3. Outside the atom entirely
     4. In the electron cloud only

298. 298. What term describes an object that is in motion and not changing its speed or direction (moving in a straight line at constant speed)?

     1. Uniform motion ✓
     2. Accelerated motion
     3. Circular motion
     4. Random motion

299. 299. What was Abdus Salam's field of major theoretical contribution, for which he shared the Nobel Prize in Physics?

     1. Electroweak unification theory (unifying electromagnetism and the weak nuclear force) ✓
     2. The theory of relativity
     3. The discovery of the electron
     4. The invention of the telephone

300. 300. What is the approximate range of frequencies audible to the average human ear?

     1. About 20 Hz to 20,000 Hz ✓
     2. About 1 Hz to 100 Hz
     3. About 1,000,000 Hz to 2,000,000 Hz
     4. About 0 Hz to 5 Hz