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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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281
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which particle carries a positive electric charge in an atom?

  • A Electron
  • B Neutron
  • C Proton
  • D Photon
Permalink
Correct Answer: Option C — Proton
Explanation: Protons are positively charged subatomic particles located in the nucleus of an atom with a charge equal in magnitude but opposite in sign to that of an electron.
Submitted by: PaperMCQs
282
Medium ppsc Uploaded: 06 Aug 2026

Which quantity remains constant in an isolated system according to the law of conservation of momentum?

  • A Total momentum
  • B Total energy
  • C Total mass
  • D Total force
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Correct Answer: Option A — Total momentum
Explanation: The law of conservation of momentum states that the total momentum of an isolated system remains constant unless acted upon by external forces. This principle applies to collisions, explosions, and various interactions between objects.
Submitted by: PaperMCQs
283
Medium fpsc Uploaded: 17 Aug 2026

According to Bernoulli's principle, as the speed of a fluid increases, its pressure:

  • A Decreases
  • B Increases
  • C Becomes zero
  • D Remains constant
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Correct Answer: Option A — Decreases
Explanation: Bernoulli's principle states that for an ideal flowing fluid, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or potential energy, explaining phenomena like airplane lift.
Submitted by: PaperMCQs
284
Hard pms Uploaded: 17 Aug 2026

A transformer works on the principle of:

  • A Electromagnetic induction
  • B Electrostatic attraction
  • C Thermal conduction
  • D Chemical reaction
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Correct Answer: Option A — Electromagnetic induction
Explanation: A transformer operates on the principle of mutual electromagnetic induction, using a changing current in a primary coil to induce a corresponding voltage in a secondary coil through a shared magnetic core.
Submitted by: PaperMCQs
285
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.
Submitted by: PaperMCQs
286
Hard nts Uploaded: 06 Aug 2026

What is the term for the total energy possessed by a moving fluid, combining pressure, kinetic, and potential energy?

  • A Continuity equation
  • B Fluid dynamics
  • C Bernoulli's principle
  • D Flow rate
Permalink
Correct Answer: Option C — Bernoulli's principle
Explanation: Bernoulli's principle states that within a flowing fluid, an increase in speed occurs simultaneously with a decrease in pressure, reflecting the conservation of total mechanical energy along a streamline in fluid dynamics.
Submitted by: PaperMCQs
287
Medium pms Uploaded: 17 Aug 2026

Sound waves are an example of:

  • A Longitudinal waves
  • B Standing waves only
  • C Electromagnetic waves
  • D Transverse waves
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Correct Answer: Option A — Longitudinal waves
Explanation: Sound waves are longitudinal waves in which the particles of the medium vibrate parallel to the direction of wave propagation, creating alternating regions of compression and rarefaction as the wave travels.
Submitted by: PaperMCQs
288
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
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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.
Submitted by: PaperMCQs
289
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of energy?

  • A Joule
  • B Watt
  • C Newton
  • D Pascal
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Correct Answer: Option A — Joule
Explanation: The Joule is the SI unit of energy defined as the work done when a force of one Newton moves an object one metre in the direction of the force.
Submitted by: PaperMCQs
290
Easy nts Uploaded: 17 Aug 2026

A body moving with uniform velocity has:

  • A Zero acceleration
  • B Zero velocity
  • C Zero displacement
  • D Varying speed
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Correct Answer: Option A — Zero acceleration
Explanation: When a body moves with uniform velocity, both its speed and direction remain constant, meaning there is no change in velocity over time and hence the acceleration of the body is zero.
Submitted by: PaperMCQs
291
Easy fpsc ppsc nts Uploaded: 05 Aug 2026

Which property of a wave is the distance measured from one crest to the next crest?

  • A Amplitude
  • B Frequency
  • C Wavelength
  • D Speed
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Correct Answer: Option C — Wavelength
Explanation: Wavelength is the distance between two successive identical points on a wave such as crest to crest and is inversely related to frequency for waves travelling at the same speed.
Submitted by: PaperMCQs
292
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the function of an optical fibre?

  • A To store electrical energy
  • B To transmit light signals over long distances using total internal reflection
  • C To measure temperature
  • D To amplify sound waves
Permalink
Correct Answer: Option B — To transmit light signals over long distances using total internal reflection
Explanation: Optical fibres transmit light signals over long distances using total internal reflection within a glass or plastic fibre and are the backbone of modern high-speed internet communications.
Submitted by: PaperMCQs
293
Hard fpsc Uploaded: 06 Aug 2026

What is the term for the minimum energy needed to remove an electron from a metal surface?

  • A Ionization energy
  • B Binding energy
  • C Work function
  • D Activation energy
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Correct Answer: Option C — Work function
Explanation: Work function is the minimum energy required to remove an electron from the surface of a metal, a concept crucial to understanding the photoelectric effect. It varies between different metals and determines their electron emission properties under light exposure.
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294
Medium nts Uploaded: 06 Aug 2026

Which unit measures the rate of energy transfer in an electrical circuit?

  • A Volt
  • B Watt
  • C Ampere
  • D Ohm
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Correct Answer: Option B — Watt
Explanation: The watt is the unit measuring the rate of energy transfer or power consumption within an electrical circuit, calculated by multiplying voltage and current. It quantifies how quickly electrical devices use or generate energy.
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295
Medium fpsc Uploaded: 17 Aug 2026

The critical angle is the angle of incidence for which the angle of refraction is:

  • A 90 degrees
  • B 0 degrees
  • C 180 degrees
  • D 45 degrees
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Correct Answer: Option A — 90 degrees
Explanation: The critical angle is defined as the specific angle of incidence in a denser medium at which the refracted ray travels exactly along the boundary, making the angle of refraction equal to 90 degrees.
Submitted by: PaperMCQs
296
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
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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.
Submitted by: PaperMCQs
297
Easy pms Uploaded: 06 Aug 2026

Which principle explains that pressure applied to an enclosed fluid is transmitted equally in all directions?

  • A Archimedes' Principle
  • B Pascal's Law
  • C Bernoulli's Principle
  • D Boyle's Law
Permalink
Correct Answer: Option B — Pascal's Law
Explanation: Pascal's Law states that pressure applied to an enclosed, incompressible fluid is transmitted undiminished throughout the fluid in all directions. This principle underlies the operation of hydraulic systems including car brakes and lifts.
Submitted by: PaperMCQs
298
Medium nts Uploaded: 17 Aug 2026

The specific heat capacity of water is approximately:

  • A 2 cal/g degree C
  • B 1 cal/g degree C
  • C 0.1 cal/g degree C
  • D 0.5 cal/g degree C
Permalink
Correct Answer: Option B — 1 cal/g degree C
Explanation: Water has a specific heat capacity of approximately 1 calorie per gram per degree Celsius, which is relatively high compared to most substances, allowing it to absorb or release large amounts of heat.
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299
Medium nts Uploaded: 17 Aug 2026

The SI unit of magnetic flux is:

  • A Tesla
  • B Farad
  • C Weber
  • D Henry
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Correct Answer: Option C — Weber
Explanation: Magnetic flux, which represents the total magnetic field passing through a given area, is measured in Weber (Wb) in the SI system, named after German physicist Wilhelm Eduard Weber.
Submitted by: PaperMCQs
300
Easy nts Uploaded: 17 Aug 2026

Torque is the rotational equivalent of which linear quantity?

  • A Velocity
  • B Force
  • C Momentum
  • D Acceleration
Permalink
Correct Answer: Option B — Force
Explanation: Torque is the rotational analogue of force in linear motion; it is calculated as the product of force and the perpendicular distance from the axis of rotation, causing angular acceleration in a body.
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