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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.

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341
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which scientist is known as the Father of Physics?

  • A Isaac Newton
  • B Albert Einstein
  • C Galileo Galilei
  • D Archimedes
Permalink
Correct Answer: Option C — Galileo Galilei
Explanation: Galileo Galilei is widely regarded as the Father of Physics for his pioneering experimental approach to the study of motion mechanics and astronomy in the 16th and 17th centuries.
Submitted by: PaperMCQs
342
Easy nts Uploaded: 17 Aug 2026

The law of conservation of linear momentum applies to a system when:

  • A Mass is constant only
  • B External force is maximum
  • C External force is zero
  • D Internal forces are zero
Permalink
Correct Answer: Option C — External force is zero
Explanation: Linear momentum of a system is conserved when the net external force acting on it is zero, meaning the total momentum before an event, such as a collision, equals the total momentum after it.
Submitted by: PaperMCQs
343
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which process transfers heat through the movement of fluid currents?

  • A Convection
  • B Conduction
  • C Radiation
  • D Sublimation
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Correct Answer: Option A — Convection
Explanation: Convection transfers heat through the movement of fluids as warmer less dense fluid rises and cooler denser fluid sinks creating convection currents that distribute thermal energy.
Submitted by: PaperMCQs
344
Hard fpsc Uploaded: 06 Aug 2026

What is the unit used to measure radioactivity?

  • A Becquerel
  • B Both A and B
  • C Roentgen
  • D Curie
Permalink
Correct Answer: Option B — Both A and B
Explanation: Both the Curie (Ci) and Becquerel (Bq) are units used to measure radioactivity. The Becquerel is the SI unit, representing one radioactive decay per second, while the Curie is an older unit equal to 3.7 x 10^10 decays per second.
Submitted by: PaperMCQs
345
Easy css Uploaded: 06 Aug 2026

What is the term for the force per unit area exerted on a surface?

  • A Force
  • B Energy
  • C Work
  • D Pressure
Permalink
Correct Answer: Option D — Pressure
Explanation: Pressure is defined as the force exerted perpendicular to a surface divided by the area over which it acts, measured in Pascals. It plays a critical role in fluids, gases, and structural engineering applications.
Submitted by: PaperMCQs
346
Medium fpsc Uploaded: 17 Aug 2026

The splitting of white light into its component colors is called:

  • A Reflection
  • B Refraction
  • C Diffraction
  • D Dispersion
Permalink
Correct Answer: Option D — Dispersion
Explanation: Dispersion is the phenomenon where white light separates into its constituent colors, forming a spectrum, because different wavelengths of light refract by different amounts when passing through a prism or similar medium.
Submitted by: PaperMCQs
347
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which type of nuclear reaction combines light nuclei to form a heavier nucleus releasing energy?

  • A Nuclear fusion
  • B Nuclear fission
  • C Radioactive decay
  • D Alpha decay
Permalink
Correct Answer: Option A — Nuclear fusion
Explanation: Nuclear fusion combines light nuclei such as hydrogen isotopes to form heavier nuclei releasing vast amounts of energy and is the process powering the sun and hydrogen bombs.
Submitted by: PaperMCQs
348
Medium ppsc Uploaded: 06 Aug 2026

What is the unit of electrical energy commonly used by power companies?

  • A Kilowatt-hour
  • B Joule
  • C Watt
  • D Ampere-hour
Permalink
Correct Answer: Option A — Kilowatt-hour
Explanation: The kilowatt-hour is a practical unit representing the energy consumed by a one-kilowatt device operating for one hour. Power companies use this unit to measure and bill household and industrial electricity consumption accurately.
Submitted by: PaperMCQs
349
Medium css Uploaded: 17 Aug 2026

The SI unit of viscosity is:

  • A Joule
  • B Watt
  • C Newton
  • D Pascal second
Permalink
Correct Answer: Option D — Pascal second
Explanation: Viscosity is measured in Pascal-seconds (Pa路s) in the SI system, representing the resistance of a fluid to gradual deformation caused by shear or tensile stress applied within the fluid.
Submitted by: PaperMCQs
350
Medium nts Uploaded: 17 Aug 2026

Unlike charges:

  • A Cancel gravity
  • B Attract each other
  • C Have no interaction
  • D Repel each other
Permalink
Correct Answer: Option B — Attract each other
Explanation: Unlike electric charges, meaning one positive and one negative, attract each other according to Coulomb's law, forming the basis for how atoms and molecules are held together through electrostatic forces.
Submitted by: PaperMCQs
351
Easy pms Uploaded: 17 Aug 2026

Which of Newton's laws explains the concept of inertia?

  • A Law of gravitation
  • B Third law
  • C Second law
  • D First law
Permalink
Correct Answer: Option D — First law
Explanation: Newton's first law states that an object remains at rest or in uniform motion unless acted upon by an external force, which is the fundamental definition of inertia, the resistance of a body to change its state of motion.
Submitted by: PaperMCQs
352
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which law states that the pressure of a gas is inversely proportional to its volume at constant temperature?

  • A Boyle's Law
  • B Charles's Law
  • C Avogadro's Law
  • D Gay-Lussac'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 doubling pressure halves the volume.
Submitted by: PaperMCQs
353
Medium fpsc Uploaded: 06 Aug 2026

What is the term for a substance that does not allow heat or electricity to pass through it easily?

  • A Conductor
  • B Insulator
  • C Semiconductor
  • D Superconductor
Permalink
Correct Answer: Option B — Insulator
Explanation: Insulators, such as rubber, glass, and wood, resist the flow of heat or electric current due to a lack of freely moving charge carriers. They are commonly used to protect wiring and prevent unwanted energy transfer.
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354
Medium css Uploaded: 17 Aug 2026

The unit used to measure the loudness of sound is:

  • A Decibel
  • B Hertz
  • C Watt
  • D Newton
Permalink
Correct Answer: Option A — Decibel
Explanation: The decibel (dB) is the standard unit used to express the intensity or loudness of sound on a logarithmic scale, accounting for the wide range of sound intensities perceivable by the human ear.
Submitted by: PaperMCQs
355
Easy nts Uploaded: 17 Aug 2026

The process by which two light nuclei combine to form a heavier nucleus is called:

  • A Nuclear fission
  • B Nuclear fusion
  • C Alpha decay
  • D Radioactive decay
Permalink
Correct Answer: Option B — Nuclear fusion
Explanation: Nuclear fusion is the process where two light atomic nuclei, such as hydrogen isotopes, combine under extreme temperature and pressure to form a heavier nucleus, releasing enormous amounts of energy, as occurs in stars.
Submitted by: PaperMCQs
356
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which law of thermodynamics states that heat naturally flows from a hotter body to a cooler body?

  • A First Law
  • B Zeroth Law
  • C Second Law
  • D Third Law
Permalink
Correct Answer: Option C — Second Law
Explanation: The Second Law of Thermodynamics states that heat naturally flows from a hot body to a cooler one and entropy of an isolated system tends to increase over time.
Submitted by: PaperMCQs
357
Easy ppsc Uploaded: 17 Aug 2026

The work-energy theorem states that the work done on a body equals its:

  • A Change in momentum
  • B Change in potential energy
  • C Change in kinetic energy
  • D Total mechanical energy
Permalink
Correct Answer: Option C — Change in kinetic energy
Explanation: The work-energy theorem states that the net work done on an object by all forces equals the change in its kinetic energy, connecting the concepts of force, displacement, and motion energy directly.
Submitted by: PaperMCQs
358
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which kinetic theory explains that gas pressure results from molecular collisions with container walls?

  • A Boyle's Law
  • B Avogadro's Law
  • C Charles's Law
  • D Kinetic molecular theory
Permalink
Correct Answer: Option D — Kinetic molecular theory
Explanation: The kinetic molecular theory explains that gas pressure results from the constant random motion and elastic collisions of gas molecules with the walls of their container.
Submitted by: PaperMCQs
359
Hard nts Uploaded: 06 Aug 2026

What is the term for the total internal reflection angle beyond which light cannot exit a medium?

  • A Incident angle
  • B Reflection angle
  • C Refractive angle
  • D Critical angle
Permalink
Correct Answer: Option D — Critical angle
Explanation: The critical angle is the angle of incidence beyond which light traveling from a denser to a rarer medium is completely internally reflected rather than refracted. This principle underlies technologies like optical fibers used in modern communication systems.
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360
Medium fpsc Uploaded: 06 Aug 2026

Which quantity describes the turning effect of a force around a pivot point?

  • A Torque
  • B Momentum
  • C Impulse
  • D Velocity
Permalink
Correct Answer: Option A — Torque
Explanation: Torque measures the rotational or turning effect produced by a force applied at a distance from a pivot point, calculated by multiplying force by the perpendicular distance from the axis of rotation, often called the lever arm.
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