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Physics MCQs

228 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
Medium css Uploaded: 17 Aug 2026

A concave lens is also known as a:

  • A Diverging lens
  • B Converging lens
  • C Plane lens
  • D Bifocal lens
Permalink
Correct Answer: Option A — Diverging lens
Explanation: A concave lens, thinner at the center than at the edges, is called a diverging lens because it spreads out parallel rays of light outward rather than focusing them to a point.
Submitted by: PaperMCQs
5
Medium ppsc Uploaded: 17 Aug 2026

A light-emitting diode (LED) converts electrical energy into:

  • A Chemical energy
  • B Sound energy
  • C Light energy
  • D Mechanical energy
Permalink
Correct Answer: Option C — Light energy
Explanation: A light-emitting diode, or LED, is a semiconductor device that emits light energy when an electric current passes through it in the forward direction, due to electron-hole recombination within the material.
Submitted by: PaperMCQs
6
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
7
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
8
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
9
Medium ppsc Uploaded: 17 Aug 2026

The number of complete waves passing a point per second is called:

  • A Wavelength
  • B Frequency
  • C Amplitude
  • D Wave speed
Permalink
Correct Answer: Option B — Frequency
Explanation: Frequency is defined as the number of complete oscillations or wave cycles that pass a fixed point in one second, and it is measured in Hertz (Hz) in the SI system.
Submitted by: PaperMCQs
10
Medium css Uploaded: 17 Aug 2026

Quantum mechanics primarily deals with the behavior of:

  • A Macroscopic objects
  • B Large celestial bodies
  • C Subatomic particles
  • D Fluids in motion
Permalink
Correct Answer: Option C — Subatomic particles
Explanation: Quantum mechanics is the branch of physics that describes the behavior and properties of subatomic particles such as electrons, protons, and photons, where classical Newtonian mechanics no longer applies accurately.
Submitted by: PaperMCQs
11
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
12
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
13
Medium pms Uploaded: 17 Aug 2026

Which mirror is used as a rear-view mirror in vehicles?

  • A Plane mirror
  • B Cylindrical mirror
  • C Convex mirror
  • D Concave mirror
Permalink
Correct Answer: Option C — Convex mirror
Explanation: A convex mirror is used as a rear-view mirror in vehicles because it produces a diminished, upright, virtual image and provides a wider field of view compared to a flat plane mirror.
Submitted by: PaperMCQs
14
Medium pms Uploaded: 17 Aug 2026

The transfer of heat through fluids due to the actual movement of the fluid particles is called:

  • A Conduction
  • B Radiation
  • C Insulation
  • D Convection
Permalink
Correct Answer: Option D — Convection
Explanation: Convection is the process of heat transfer that occurs due to the bulk movement of fluid particles, carrying thermal energy from warmer regions to cooler regions within liquids or gases.
Submitted by: PaperMCQs
15
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
16
Medium pms Uploaded: 06 Aug 2026

What is the term for the electrical potential difference between two points in a circuit?

  • A Current
  • B Resistance
  • C Voltage
  • D Power
Permalink
Correct Answer: Option C — Voltage
Explanation: Voltage, also known as electric potential difference, represents the energy per unit charge required to move electric charge between two points in a circuit. It drives current flow through a conductor when a complete circuit exists.
Submitted by: PaperMCQs
17
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
18
Medium css Uploaded: 17 Aug 2026

Weight of a body is the force of gravity acting on its:

  • A Volume
  • B Area
  • C Density
  • D Mass
Permalink
Correct Answer: Option D — Mass
Explanation: Weight is the gravitational force exerted on the mass of an object by a nearby celestial body such as Earth, calculated as mass multiplied by the local gravitational acceleration, and it varies with location.
Submitted by: PaperMCQs
19
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
20
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
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