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Physics MCQs

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81
Hard css fpsc Uploaded: 13 Jul 2026

What is the SI unit of inductance?

  • A Farad
  • B Tesla
  • C Weber
  • D Henry
Permalink
Correct Answer: Option D — Henry
Explanation: The Henry is the SI unit of inductance named after American scientist Joseph Henry defined as the inductance that produces an EMF of one volt when current changes at one ampere per second.
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82
Easy css Uploaded: 06 Aug 2026

Which particle has no electric charge?

  • A Neutron
  • B Proton
  • C Electron
  • D Positron
Permalink
Correct Answer: Option A — Neutron
Explanation: The neutron is a subatomic particle found in the nucleus of an atom that carries no net electric charge. Along with protons, neutrons contribute to the atomic mass, but unlike protons, they do not affect the atom's overall charge.
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83
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the half-life of a radioactive substance?

  • A Time for the substance to completely decay
  • B Time for the radiation to halve in intensity only
  • C Time for half the nuclei to decay
  • D Time for temperature to reduce by half
Permalink
Correct Answer: Option C — Time for half the nuclei to decay
Explanation: Half-life is the time required for half of the radioactive nuclei in a sample to decay and it is a constant characteristic value specific to each radioactive isotope.
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84
Easy css Uploaded: 06 Aug 2026

What is the term for a material that allows electric current to pass through easily?

  • A Insulator
  • B Conductor
  • C Semiconductor
  • D Superconductor
Permalink
Correct Answer: Option B — Conductor
Explanation: Conductors, such as copper and aluminum, allow electric current to flow easily due to the presence of free electrons that can move through the material. They are widely used in electrical wiring and circuits.
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85
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which experiment demonstrated that light behaves as a wave by producing an interference pattern?

  • A Young's double slit experiment
  • B Rutherford's gold foil experiment
  • C Millikan's oil drop experiment
  • D Compton scattering experiment
Permalink
Correct Answer: Option A — Young's double slit experiment
Explanation: Young's double slit experiment demonstrated light's wave nature by producing alternating bright and dark fringes on a screen when coherent light passed through two closely spaced slits.
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86
Easy css Uploaded: 17 Aug 2026

The de Broglie hypothesis proposed that particles such as electrons exhibit:

  • A No measurable properties
  • B Only wave nature
  • C Both wave and particle nature
  • D Only particle nature
Permalink
Correct Answer: Option C — Both wave and particle nature
Explanation: Louis de Broglie proposed that all matter, including particles like electrons, exhibits wave-like properties in addition to particle properties, introducing the fundamental concept of wave-particle duality in quantum theory.
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87
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Who explained the photoelectric effect and won the Nobel Prize for it in 1921?

  • A Albert Einstein
  • B Max Planck
  • C Niels Bohr
  • D Ernest Rutherford
Permalink
Correct Answer: Option A — Albert Einstein
Explanation: Albert Einstein explained the photoelectric effect in 1905 by proposing that light consists of discrete packets of energy called photons and won the Nobel Prize in Physics in 1921 for this work.
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88
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which principle explains why an aircraft wing generates lift?

  • A Pascal's principle
  • B Bernoulli's principle
  • C Archimedes' principle
  • D Newton's first law only
Permalink
Correct Answer: Option B — Bernoulli's principle
Explanation: Bernoulli's principle explains that faster moving air over the curved upper wing surface has lower pressure than the slower air beneath creating a net upward lift force.
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89
Easy css Uploaded: 06 Aug 2026

Which phenomenon explains why the sky appears blue during the day?

  • A Reflection
  • B Refraction
  • C Diffraction
  • D Scattering
Permalink
Correct Answer: Option D — Scattering
Explanation: The sky appears blue due to Rayleigh scattering, where shorter blue wavelengths of sunlight are scattered more strongly by gas molecules in the atmosphere than longer wavelengths like red, spreading blue light across the sky.
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90
Medium css Uploaded: 17 Aug 2026

What happens to the kinetic energy of a body when its velocity is doubled?

  • A Triples
  • B Doubles
  • C Becomes four times
  • D Remains the same
Permalink
Correct Answer: Option C — Becomes four times
Explanation: Since kinetic energy is proportional to the square of velocity, doubling the velocity of a body increases its kinetic energy by a factor of four, assuming the mass remains unchanged throughout.
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91
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which scientist developed the theory of general relativity extending special relativity to include gravity?

  • A Isaac Newton
  • B Albert Einstein
  • C Niels Bohr
  • D Max Planck
Permalink
Correct Answer: Option B — Albert Einstein
Explanation: Albert Einstein developed the theory of general relativity in 1915 describing gravity as a curvature of spacetime caused by mass and energy rather than a force between objects.
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92
Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which type of spectrum consists of specific discrete wavelengths emitted by excited atoms?

  • A Continuous spectrum
  • B Line emission spectrum
  • C Absorption spectrum
  • D Band spectrum
Permalink
Correct Answer: Option B — Line emission spectrum
Explanation: A line emission spectrum consists of discrete bright lines at specific wavelengths produced when electrons in excited atoms fall to lower energy levels releasing photons of specific energies.
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93
Easy css Uploaded: 17 Aug 2026

The color with the longest wavelength in the visible spectrum is:

  • A Blue
  • B Red
  • C Green
  • D Violet
Permalink
Correct Answer: Option B — Red
Explanation: Among the colors of the visible light spectrum, red has the longest wavelength, approximately 700 nanometres, while violet has the shortest wavelength, near 400 nanometres, at the opposite end.
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94
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the Doppler effect in the context of sound waves?

  • A Change in speed of sound due to medium
  • B Change in amplitude of sound near a source
  • C Echo formation from hard surfaces
  • D Apparent change in frequency due to relative motion between source and observer
Permalink
Correct Answer: Option D — Apparent change in frequency due to relative motion between source and observer
Explanation: The Doppler effect describes the apparent change in frequency of sound or light when the source and observer are in relative motion with frequency increasing as they approach and decreasing as they move apart.
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95
Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which phenomenon explains the formation of mirages in deserts?

  • A Reflection of light
  • B Diffraction of light
  • C Total internal reflection due to air density layers
  • D Dispersion of light
Permalink
Correct Answer: Option C — Total internal reflection due to air density layers
Explanation: Mirages form due to total internal reflection when light rays from the sky refract through layers of air with varying temperature and density creating the illusion of water on the ground.
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96
Hard css Uploaded: 17 Aug 2026

The value of acceleration due to gravity decreases as one moves:

  • A Toward the equator
  • B Toward the Earth's center from the surface
  • C At sea level only
  • D Away from Earth's surface into space
Permalink
Correct Answer: Option D — Away from Earth's surface into space
Explanation: Gravitational acceleration decreases with increasing altitude above Earth's surface because the distance from Earth's center increases, following the inverse square relationship in Newton's law of universal gravitation.
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97
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is simple harmonic motion?

  • A Motion in a circle at constant speed
  • B Oscillatory motion where restoring force is proportional to displacement
  • C Uniform linear motion
  • D Random motion under multiple forces
Permalink
Correct Answer: Option B — Oscillatory motion where restoring force is proportional to displacement
Explanation: Simple harmonic motion is a type of oscillatory motion where the restoring force is directly proportional to the displacement from equilibrium and directed toward the equilibrium position.
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98
Easy css Uploaded: 06 Aug 2026

What is the term for the resistance offered by a fluid to an object moving through it?

  • A Buoyancy
  • B Drag
  • C Tension
  • D Viscosity
Permalink
Correct Answer: Option B — Drag
Explanation: Drag is the resistive force exerted by a fluid, such as air or water, opposing the motion of an object moving through it. It depends on the object's shape, speed, and the properties of the fluid.
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99
Medium css Uploaded: 17 Aug 2026

Sublimation refers to the direct change of state from:

  • A Gas to liquid
  • B Solid to gas
  • C Solid to liquid
  • D Liquid to gas
Permalink
Correct Answer: Option B — Solid to gas
Explanation: Sublimation is the process by which a substance transitions directly from a solid state to a gaseous state without passing through the intermediate liquid phase, as seen with dry ice.
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100
Medium css Uploaded: 17 Aug 2026

The electron was discovered by:

  • A Niels Bohr
  • B J.J. Thomson
  • C James Chadwick
  • D Ernest Rutherford
Permalink
Correct Answer: Option B — J.J. Thomson
Explanation: J.J. Thomson discovered the electron in 1897 through his experiments with cathode rays, identifying it as a negatively charged subatomic particle much smaller than the atom itself.
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