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Physics MCQs

442 Questions Subject Test
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Practice core concepts of measurement, motion, force, energy, waves, electricity, magnetism and modern physics.

MechanicsWavesElectricityModern Physics
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121
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
Permalink
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
122
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
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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.
Submitted by: PaperMCQs
123
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
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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
124
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.
Submitted by: PaperMCQs
125
Easy css Uploaded: 06 Aug 2026

What is the term for the change in frequency of a wave due to relative motion between source and observer?

  • A Doppler effect
  • B Reflection effect
  • C Interference effect
  • D Resonance effect
Permalink
Correct Answer: Option A — Doppler effect
Explanation: The Doppler effect describes the apparent change in frequency of a wave, such as sound or light, as perceived by an observer when the source and observer move relative to each other, either approaching or receding.
Submitted by: PaperMCQs
126
Easy pms Uploaded: 17 Aug 2026

The human eye lens is:

  • A Concave
  • B Convex
  • C Cylindrical
  • D Plane
Permalink
Correct Answer: Option B — Convex
Explanation: The lens of the human eye is a convex, converging lens that helps focus incoming light rays onto the retina, and its shape can be adjusted by the ciliary muscles to focus at different distances.
Submitted by: PaperMCQs
127
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.
Submitted by: PaperMCQs
128
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.
Submitted by: PaperMCQs
129
Easy nts Uploaded: 17 Aug 2026

Which law states that the total entropy of an isolated system can never decrease?

  • A Second law of thermodynamics
  • B Zeroth law of thermodynamics
  • C First law of thermodynamics
  • D Third law of thermodynamics
Permalink
Correct Answer: Option A — Second law of thermodynamics
Explanation: The second law of thermodynamics states that the total entropy, a measure of disorder, of an isolated system always increases over time or remains constant in ideal reversible processes, never decreasing.
Submitted by: PaperMCQs
130
Easy fpsc Uploaded: 17 Aug 2026

The SI unit of magnetic flux density is:

  • A Tesla
  • B Weber
  • C Farad
  • D Henry
Permalink
Correct Answer: Option A — Tesla
Explanation: Magnetic flux density, also known as magnetic field strength, is measured in Tesla (T) in the SI system, named in honor of the inventor and engineer Nikola Tesla.
Submitted by: PaperMCQs
131
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.
Submitted by: PaperMCQs
132
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
Permalink
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
133
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
Permalink
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.
Submitted by: PaperMCQs
134
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.
Submitted by: PaperMCQs
135
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.
Submitted by: PaperMCQs
136
Hard fpsc Uploaded: 17 Aug 2026

A transistor is primarily used for:

  • A Storing charge
  • B Generating light
  • C Measuring temperature
  • D Amplification and switching
Permalink
Correct Answer: Option D — Amplification and switching
Explanation: A transistor is a fundamental semiconductor device widely used for amplifying electronic signals and for switching electronic signals on and off, forming the basis of modern digital electronics and computing.
Submitted by: PaperMCQs
137
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the acceleration due to gravity at the surface of the Earth?

  • A 8.9 m/s squared
  • B 10.8 m/s squared
  • C 9.8 m/s squared
  • D 7.8 m/s squared
Permalink
Correct Answer: Option C — 9.8 m/s squared
Explanation: The standard acceleration due to gravity at the Earth's surface is approximately 9.8 metres per second squared commonly rounded to 10 m/s squared in simple calculations.
Submitted by: PaperMCQs
138
Easy ppsc Uploaded: 17 Aug 2026

Gravitational potential energy between two masses is always:

  • A Zero
  • B Infinite
  • C Positive
  • D Negative
Permalink
Correct Answer: Option D — Negative
Explanation: Gravitational potential energy is conventionally taken as negative because it is defined as zero at infinite separation, and energy must be added to separate two attracting masses further apart from each other.
Submitted by: PaperMCQs
139
Easy ppsc Uploaded: 06 Aug 2026

What is the term used for the resistance of a body to change its state of motion?

  • A Inertia
  • B Acceleration
  • C Velocity
  • D Momentum
Permalink
Correct Answer: Option A — Inertia
Explanation: Inertia is the inherent resistance of an object to any change in its state of motion, whether at rest or moving at constant velocity. This property, described in Newton's First Law, depends directly on the mass of the object.
Submitted by: PaperMCQs
140
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.
Submitted by: PaperMCQs
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