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Physics MCQs

177 Questions Subject Test
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61
Easy fpsc Uploaded: 17 Aug 2026

Which gas law states that pressure is inversely proportional to volume at constant temperature?

  • A Boyle's law
  • B Gay-Lussac's law
  • C Charles's law
  • D Avogadro's law
Permalink
Correct Answer: Option A — Boyle's law
Explanation: Boyle's law states that at constant temperature, the pressure of a fixed amount of gas is inversely proportional to its volume, meaning that as volume decreases, pressure increases proportionally.
Submitted by: PaperMCQs
62
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which law states that every action has an equal and opposite reaction?

  • A Newton's First Law
  • B Newton's Second Law
  • C Newton's Third Law
  • D Law of Gravitation
Permalink
Correct Answer: Option C — Newton's Third Law
Explanation: Newton's Third Law states that for every action there is an equal and opposite reaction meaning forces always occur in pairs acting on different objects.
Submitted by: PaperMCQs
63
Hard css fpsc Uploaded: 05 Aug 2026

Which phenomenon describes the bending of light around a massive object predicted by general relativity?

  • A Gravitational lensing
  • B Refraction
  • C Diffraction
  • D Polarisation
Permalink
Correct Answer: Option A — Gravitational lensing
Explanation: Gravitational lensing occurs when light from a distant source bends around a massive object confirming Einstein's general relativity and first observed during the 1919 solar eclipse.
Submitted by: PaperMCQs
64
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the terminal velocity of a falling object?

  • A Minimum speed during fall
  • B Speed at which object first starts moving
  • C Speed independent of mass
  • D Maximum speed reached when weight equals air resistance
Permalink
Correct Answer: Option D — Maximum speed reached when weight equals air resistance
Explanation: Terminal velocity is the constant maximum speed reached by a falling object when the downward gravitational force equals the upward air resistance force resulting in zero net force.
Submitted by: PaperMCQs
65
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which law relates the force between two electric charges to the distance between them?

  • A Ohm's Law
  • B Coulomb's Law
  • C Faraday's Law
  • D Ampere's Law
Permalink
Correct Answer: Option B — Coulomb's Law
Explanation: Coulomb's Law states that the electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
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66
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is absolute zero temperature in degrees Celsius?

  • A 0 degrees Celsius
  • B minus 100 degrees Celsius
  • C minus 273 degrees Celsius
  • D minus 373 degrees Celsius
Permalink
Correct Answer: Option C — minus 273 degrees Celsius
Explanation: Absolute zero is minus 273.15 degrees Celsius or 0 Kelvin the theoretical lowest temperature at which particles have minimum thermal motion.
Submitted by: PaperMCQs
67
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which phenomenon occurs when light bends around the edges of an obstacle or aperture?

  • A Refraction
  • B Reflection
  • C Diffraction
  • D Dispersion
Permalink
Correct Answer: Option C — Diffraction
Explanation: Diffraction is the bending of light waves around the edges of an obstacle or through an aperture and is most noticeable when the obstacle size is comparable to the wavelength.
Submitted by: PaperMCQs
68
Easy fpsc Uploaded: 17 Aug 2026

The power of a convex lens is considered:

  • A Undefined
  • B Zero
  • C Positive
  • D Negative
Permalink
Correct Answer: Option C — Positive
Explanation: The optical power of a convex, or converging, lens is conventionally taken as positive because it converges parallel rays of light to a real focal point on the opposite side of the lens.
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69
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which type of radiation has the highest penetrating power?

  • A Alpha radiation
  • B Gamma radiation
  • C Beta radiation
  • D Neutron radiation
Permalink
Correct Answer: Option B — Gamma radiation
Explanation: Gamma radiation is highly penetrating electromagnetic radiation that can pass through most materials and requires dense materials like thick lead or concrete for adequate shielding.
Submitted by: PaperMCQs
70
Medium fpsc Uploaded: 06 Aug 2026

What is the term for the maximum displacement of a wave from its rest position?

  • A Wavelength
  • B Frequency
  • C Amplitude
  • D Period
Permalink
Correct Answer: Option C — Amplitude
Explanation: Amplitude represents the maximum displacement of particles from their equilibrium position as a wave passes through a medium. Greater amplitude corresponds to louder sound or brighter light, depending on the type of wave involved.
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71
Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which effect causes the apparent change in frequency of light from a moving star?

  • A Photoelectric effect
  • B Compton effect
  • C Zeeman effect
  • D Doppler effect
Permalink
Correct Answer: Option D — Doppler effect
Explanation: The Doppler effect causes light from a star moving away from us to shift to longer wavelengths called red shift while light from an approaching star shifts to shorter wavelengths called blue shift.
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72
Hard css fpsc Uploaded: 13 Jul 2026

What is the unit of magnetic flux density?

  • A Tesla
  • B Weber
  • C Henry
  • D Farad
Permalink
Correct Answer: Option A — Tesla
Explanation: Tesla is the SI unit of magnetic flux density or magnetic field strength representing one weber of magnetic flux per square metre.
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73
Medium fpsc Uploaded: 17 Aug 2026

Which law states that induced EMF is proportional to the rate of change of magnetic flux?

  • A Coulomb's law
  • B Faraday's law
  • C Lenz's law
  • D Ohm's law
Permalink
Correct Answer: Option B — Faraday's law
Explanation: Faraday's law of electromagnetic induction states that the induced electromotive force in a circuit is directly proportional to the rate of change of magnetic flux through that circuit over time.
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74
Hard css fpsc Uploaded: 13 Jul 2026

Which device uses the piezoelectric effect to produce ultrasonic waves?

  • A Loudspeaker
  • B Microphone
  • C Electric motor
  • D Ultrasonic transducer
Permalink
Correct Answer: Option D — Ultrasonic transducer
Explanation: An ultrasonic transducer uses the piezoelectric effect where certain crystals generate mechanical vibrations when an electric voltage is applied producing high frequency sound waves.
Submitted by: PaperMCQs
75
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the unit of electrical resistance?

  • A Volt
  • B Ampere
  • C Watt
  • D Ohm
Permalink
Correct Answer: Option D — Ohm
Explanation: The Ohm named after German physicist Georg Simon Ohm is the SI unit of electrical resistance defined as the resistance that produces a potential difference of one volt per ampere.
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76
Hard css fpsc Uploaded: 05 Aug 2026

What is the phenomenon where a material loses all electrical resistance below a critical temperature?

  • A Semiconduction
  • B Ferromagnetism
  • C Paramagnetism
  • D Superconductivity
Permalink
Correct Answer: Option D — Superconductivity
Explanation: Superconductivity is the phenomenon where certain materials exhibit zero electrical resistance below a critical temperature allowing current to flow indefinitely without energy loss.
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77
Hard css fpsc ppsc Uploaded: 13 Jul 2026

What is the name of the force that holds protons and neutrons together inside the nucleus?

  • A Electromagnetic force
  • B Gravitational force
  • C Strong nuclear force
  • D Weak nuclear force
Permalink
Correct Answer: Option C — Strong nuclear force
Explanation: The strong nuclear force holds protons and neutrons together inside the atomic nucleus and is the strongest of the four fundamental forces operating only at very short ranges.
Submitted by: PaperMCQs
78
Hard css fpsc Uploaded: 13 Jul 2026

What is the phenomenon where certain materials offer zero electrical resistance below a critical temperature?

  • A Semiconduction
  • B Ferromagnetism
  • C Piezoelectricity
  • D Superconductivity
Permalink
Correct Answer: Option D — Superconductivity
Explanation: Superconductivity is the phenomenon where certain materials exhibit zero electrical resistance and expel magnetic fields when cooled below a characteristic critical temperature.
Submitted by: PaperMCQs
79
Easy fpsc Uploaded: 17 Aug 2026

Which mode of heat transfer does not require a medium?

  • A Conduction
  • B Convection
  • C Both conduction and convection
  • D Radiation
Permalink
Correct Answer: Option D — Radiation
Explanation: Radiation is the transfer of heat energy through electromagnetic waves and does not require any physical medium, which is why heat from the Sun can reach Earth through the vacuum of space.
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80
Easy fpsc Uploaded: 17 Aug 2026

The power of a machine that does 1000 J of work in 10 seconds is:

  • A 10 W
  • B 1000 W
  • C 100 W
  • D 10000 W
Permalink
Correct Answer: Option C — 100 W
Explanation: Power equals work divided by time, so 1000 joules divided by 10 seconds gives 100 watts. Power measures the rate at which work is done or energy is transferred in a system.
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