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Physics MCQs

228 Questions Subject Test
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Medium ppsc Uploaded: 17 Aug 2026

The property of a fluid that resists relative motion between its layers is called:

  • A Viscosity
  • B Buoyancy
  • C Density
  • D Surface tension
Permalink
Correct Answer: Option A — Viscosity
Explanation: Viscosity is the internal resistance of a fluid to flow, arising from friction between adjacent layers moving at different velocities; higher viscosity fluids, like honey, flow more slowly than water.
Submitted by: PaperMCQs
62
Medium css Uploaded: 17 Aug 2026

The impulse of a force equals the change in:

  • A Momentum
  • B Displacement
  • C Kinetic energy
  • D Potential energy
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Correct Answer: Option A — Momentum
Explanation: Impulse is defined as the product of force and the time for which it acts, and by the impulse-momentum theorem, it is exactly equal to the resulting change in the momentum of a body.
Submitted by: PaperMCQs
63
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which principle states that pressure in a static fluid increases with depth depending on fluid density?

  • A Bernoulli's Principle
  • B Archimedes' Principle
  • C Pascal's Principle
  • D Hydrostatic pressure principle
Permalink
Correct Answer: Option D — Hydrostatic pressure principle
Explanation: The hydrostatic pressure principle states that pressure in a static fluid increases linearly with depth depending on fluid density and gravitational acceleration expressed as P equals rho g h.
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64
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which instrument is used to detect and measure very small electric currents?

  • A Voltmeter
  • B Ohmmeter
  • C Ammeter
  • D Galvanometer
Permalink
Correct Answer: Option D — Galvanometer
Explanation: A galvanometer is a sensitive instrument used to detect and measure very small electric currents through the deflection of a needle in a magnetic field.
Submitted by: PaperMCQs
65
Medium ppsc Uploaded: 06 Aug 2026

Which of the following is a vector quantity?

  • A Speed
  • B Energy
  • C Momentum
  • D Temperature
Permalink
Correct Answer: Option C — Momentum
Explanation: Momentum is a vector quantity because it possesses both magnitude and direction, calculated as the product of an object's mass and velocity. Unlike scalar quantities such as speed or temperature, momentum's direction matters in physical calculations and collisions.
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66
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the name of the quantum of electromagnetic radiation?

  • A Electron
  • B Neutron
  • C Proton
  • D Photon
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Correct Answer: Option D — Photon
Explanation: A photon is the quantum or smallest discrete unit of electromagnetic radiation carrying energy proportional to its frequency as described by Planck's equation E equals hf.
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67
Medium ppsc Uploaded: 06 Aug 2026

What is the term for the change in velocity of an object per unit time?

  • A Acceleration
  • B Speed
  • C Momentum
  • D Displacement
Permalink
Correct Answer: Option A — Acceleration
Explanation: Acceleration measures the rate of change of an object's velocity over time, whether the object speeds up, slows down, or changes direction. It is a vector quantity, calculated as change in velocity divided by time.
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68
Medium ppsc Uploaded: 17 Aug 2026

A projectile launched at 45 degrees achieves:

  • A Maximum height
  • B Minimum time of flight
  • C Zero range
  • D Maximum range
Permalink
Correct Answer: Option D — Maximum range
Explanation: For a given initial speed, a projectile launched at a 45-degree angle achieves the maximum horizontal range because it optimally balances the vertical and horizontal components of the initial velocity.
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69
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the principle behind a periscope?

  • A Reflection of light using two parallel mirrors
  • B Diffraction of light
  • C Refraction through lenses
  • D Polarisation of light
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Correct Answer: Option A — Reflection of light using two parallel mirrors
Explanation: A periscope uses two parallel mirrors inclined at 45 degrees to reflect light allowing observation above or around obstacles without direct line of sight.
Submitted by: PaperMCQs
70
Medium nts Uploaded: 06 Aug 2026

What is the phenomenon of bending of light around obstacles called?

  • A Reflection
  • B Dispersion
  • C Diffraction
  • D Refraction
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Correct Answer: Option C — Diffraction
Explanation: Diffraction is the bending and spreading of light waves as they pass around obstacles or through small openings. This phenomenon demonstrates the wave nature of light and becomes more pronounced when the obstacle size is comparable to the wavelength.
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71
Medium fpsc Uploaded: 06 Aug 2026

What is the term for the minimum angle at which total internal reflection occurs?

  • A Angle of incidence
  • B Critical angle
  • C Angle of refraction
  • D Angle of reflection
Permalink
Correct Answer: Option B — Critical angle
Explanation: The critical angle is the specific angle of incidence beyond which light traveling from a denser to a less dense medium is completely reflected internally rather than refracting out, a principle used in optical fibers.
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72
Medium fpsc Uploaded: 17 Aug 2026

The amplitude of a wave determines its:

  • A Pitch
  • B Speed
  • C Loudness or intensity
  • D Wavelength
Permalink
Correct Answer: Option C — Loudness or intensity
Explanation: The amplitude of a sound wave, which is the maximum displacement of particles from their equilibrium position, directly determines the loudness or intensity of the sound as perceived by a listener.
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73
Medium nts Uploaded: 06 Aug 2026

What is the term for the point at which an object experiences zero net force and constant velocity?

  • A Terminal velocity
  • B Free fall
  • C Resonance
  • D Equilibrium
Permalink
Correct Answer: Option D — Equilibrium
Explanation: Equilibrium occurs when an object experiences zero net force acting upon it, resulting in either a state of rest or constant, unchanging velocity, as described by Newton's First Law regarding balanced forces.
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74
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the principle of conservation of momentum?

  • A Momentum increases with velocity only
  • B Total momentum of an isolated system remains constant
  • C Momentum equals mass times acceleration
  • D Momentum decreases with time
Permalink
Correct Answer: Option B — Total momentum of an isolated system remains constant
Explanation: The principle of conservation of momentum states that the total momentum of an isolated system remains constant provided no external forces act on it.
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75
Medium pms Uploaded: 06 Aug 2026

What is the unit used to measure the amount of electric charge?

  • A Ampere
  • B Volt
  • C Coulomb
  • D Ohm
Permalink
Correct Answer: Option C — Coulomb
Explanation: Electric charge is measured in Coulombs, named after French physicist Charles-Augustin de Coulomb. One coulomb represents the charge transported by a steady current of one ampere flowing for one second of time.
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76
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.
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77
Medium css Uploaded: 06 Aug 2026

What is the working principle of a transformer based on?

  • A Electrostatic induction
  • B Mechanical induction
  • C Thermal conduction
  • D Electromagnetic induction
Permalink
Correct Answer: Option D — Electromagnetic induction
Explanation: A transformer works on the principle of electromagnetic induction, discovered by Michael Faraday. It uses a changing magnetic field created by alternating current in the primary coil to induce a voltage in the secondary coil, enabling voltage transformation.
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78
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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79
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.
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80
Medium css Uploaded: 06 Aug 2026

What is the term for the angle at which incident light strikes a reflective surface?

  • A Angle of reflection
  • B Angle of refraction
  • C Angle of incidence
  • D Critical angle
Permalink
Correct Answer: Option C — Angle of incidence
Explanation: The angle of incidence is the angle between an incoming light ray and the normal, an imaginary line perpendicular to the reflecting surface at the point of contact, measured before the light reflects or refracts.
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