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Physics MCQs

177 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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1
Medium fpsc Uploaded: 17 Aug 2026

The center of mass of a uniform rod lies at:

  • A One end
  • B It has no definite center of mass
  • C Three-fourths of its length
  • D The midpoint
Permalink
Correct Answer: Option D — The midpoint
Explanation: For a uniform rod with evenly distributed mass, the center of mass lies exactly at its geometric midpoint, since the mass distribution is symmetric about that point along the length of the rod.
Submitted by: PaperMCQs
2
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the working principle of a hydraulic press?

  • A Pascal's law
  • B Archimedes' principle
  • C Bernoulli's principle
  • D Newton's third law
Permalink
Correct Answer: Option A — Pascal's law
Explanation: A hydraulic press works on Pascal's Law where pressure applied to an enclosed fluid is transmitted equally in all directions allowing a small force to generate a much larger force.
Submitted by: PaperMCQs
3
Medium fpsc Uploaded: 06 Aug 2026

Which type of mirror is used in vehicle headlights?

  • A Concave mirror
  • B Convex mirror
  • C Plane mirror
  • D Cylindrical mirror
Permalink
Correct Answer: Option A — Concave mirror
Explanation: Concave mirrors are used in vehicle headlights because they can converge light rays from a bulb placed at the focal point into a parallel beam. This produces a strong, focused beam of light that illuminates the road ahead effectively.
Submitted by: PaperMCQs
4
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which particle carries a negative electric charge in an atom?

  • A Proton
  • B Electron
  • C Neutron
  • D Nucleus
Permalink
Correct Answer: Option B — Electron
Explanation: Electrons are subatomic particles carrying a negative electric charge of 1.6 x 10 to the power of minus 19 coulombs and orbit the nucleus of an atom.
Submitted by: PaperMCQs
5
Medium fpsc Uploaded: 17 Aug 2026

Bernoulli's theorem is based on the conservation of:

  • A Energy
  • B Mass
  • C Charge
  • D Momentum
Permalink
Correct Answer: Option A — Energy
Explanation: Bernoulli's theorem is derived from the principle of conservation of energy applied to a flowing fluid, relating pressure, velocity, and height at different points along a streamline in an ideal fluid.
Submitted by: PaperMCQs
6
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the phenomenon where two waves superpose to produce regions of maximum and minimum intensity?

  • A Interference
  • B Diffraction
  • C Refraction
  • D Polarisation
Permalink
Correct Answer: Option A — Interference
Explanation: Interference occurs when two coherent waves superpose to produce alternating regions of constructive interference maximum intensity and destructive interference minimum intensity.
Submitted by: PaperMCQs
7
Medium fpsc Uploaded: 06 Aug 2026

Which type of electromagnetic radiation is used in microwave ovens to heat food?

  • A Microwaves
  • B X-rays
  • C Gamma rays
  • D Ultraviolet rays
Permalink
Correct Answer: Option A — Microwaves
Explanation: Microwave ovens use microwave radiation to excite water molecules within food, causing them to vibrate rapidly and generate heat through friction. This efficient heating method cooks food quickly from the inside as well as outside.
Submitted by: PaperMCQs
8
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which law states that the current through a conductor is directly proportional to the voltage across it?

  • A Faraday's Law
  • B Ohm's Law
  • C Kirchhoff's Law
  • D Coulomb's Law
Permalink
Correct Answer: Option B — Ohm's Law
Explanation: Ohm's Law states that the current I through a conductor is directly proportional to the voltage V across it at constant temperature expressed as V equals IR.
Submitted by: PaperMCQs
9
Hard css fpsc Uploaded: 05 Aug 2026

Which force holds quarks together inside protons and neutrons at subatomic distances?

  • A Weak nuclear force
  • B Strong nuclear force
  • C Gravitational force
  • D Electromagnetic force
Permalink
Correct Answer: Option B — Strong nuclear force
Explanation: The strong nuclear force mediated by gluons holds quarks together inside protons and neutrons and is the strongest of the four fundamental forces operating only at subatomic distances.
Submitted by: PaperMCQs
10
Hard css fpsc Uploaded: 13 Jul 2026

Which fundamental force is responsible for radioactive beta decay?

  • A Gravitational force
  • B Electromagnetic force
  • C Strong nuclear force
  • D Weak nuclear force
Permalink
Correct Answer: Option D — Weak nuclear force
Explanation: The weak nuclear force is responsible for radioactive beta decay where a neutron transforms into a proton by emitting an electron and an antineutrino.
Submitted by: PaperMCQs
11
Medium fpsc Uploaded: 06 Aug 2026

What is the term for the number of protons found in the nucleus of an atom?

  • A Mass number
  • B Atomic mass
  • C Isotope number
  • D Atomic number
Permalink
Correct Answer: Option D — Atomic number
Explanation: The atomic number represents the number of protons present in an atom's nucleus, uniquely identifying each chemical element on the periodic table and determining its position and fundamental chemical behavior and properties.
Submitted by: PaperMCQs
12
Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which effect describes the emission of electrons from a metal surface when light of sufficient frequency falls on it?

  • A Compton effect
  • B Zeeman effect
  • C Photoelectric effect
  • D Doppler effect
Permalink
Correct Answer: Option C — Photoelectric effect
Explanation: The photoelectric effect describes the emission of electrons from a metal surface when light above a threshold frequency strikes it and was explained by Einstein winning him the Nobel Prize.
Submitted by: PaperMCQs
13
Easy fpsc Uploaded: 17 Aug 2026

Which of the following is a good conductor of electricity?

  • A Glass
  • B Wood
  • C Copper
  • D Plastic
Permalink
Correct Answer: Option C — Copper
Explanation: Copper is an excellent electrical conductor due to the presence of many free electrons in its metallic structure, which is why it is extensively used in electrical wiring and circuits.
Submitted by: PaperMCQs
14
Medium fpsc Uploaded: 17 Aug 2026

What is the term for the tendency of a body to resist changes in its rotational motion?

  • A Angular velocity
  • B Moment of inertia
  • C Torque
  • D Angular momentum
Permalink
Correct Answer: Option B — Moment of inertia
Explanation: Moment of inertia is the rotational analogue of mass in linear motion; it measures how much a body resists angular acceleration and depends on both mass and its distribution relative to the axis.
Submitted by: PaperMCQs
15
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which device is used to measure the potential difference between two points in a circuit?

  • A Ammeter
  • B Voltmeter
  • C Galvanometer
  • D Ohmmeter
Permalink
Correct Answer: Option B — Voltmeter
Explanation: A voltmeter is connected in parallel across two points in a circuit to measure the potential difference or voltage between them and has a very high internal resistance.
Submitted by: PaperMCQs
16
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the formula for gravitational potential energy?

  • A half mv squared
  • B mgh
  • C Fxd
  • D mv
Permalink
Correct Answer: Option B — mgh
Explanation: Gravitational potential energy is calculated as mass multiplied by gravitational acceleration multiplied by height expressed as PE equals mgh where g is approximately 9.8 m/s squared.
Submitted by: PaperMCQs
17
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What does a transformer do to alternating current?

  • A Changes the voltage of AC
  • B Converts AC to DC
  • C Converts DC to AC
  • D Changes the frequency of AC
Permalink
Correct Answer: Option A — Changes the voltage of AC
Explanation: A transformer changes the voltage of alternating current using electromagnetic induction between primary and secondary coils stepping voltage up or down depending on the turns ratio.
Submitted by: PaperMCQs
18
Medium fpsc Uploaded: 17 Aug 2026

Which of the following best describes 'latent heat'?

  • A Heat that changes temperature
  • B Heat gained by radiation
  • C Heat lost to surroundings
  • D Heat absorbed or released during a phase change without temperature change
Permalink
Correct Answer: Option D — Heat absorbed or released during a phase change without temperature change
Explanation: Latent heat is the amount of thermal energy absorbed or released by a substance during a change of physical state, such as melting or boiling, without any accompanying change in temperature.
Submitted by: PaperMCQs
19
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
20
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
Permalink
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
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