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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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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 css Uploaded: 06 Aug 2026

Which law relates force, mass, and acceleration?

  • A Newton's First Law
  • B Newton's Second Law
  • C Newton's Third Law
  • D Law of Gravitation
Permalink
Correct Answer: Option B — Newton's Second Law
Explanation: Newton's Second Law states that force equals mass multiplied by acceleration, describing how the net force applied to an object determines its rate of acceleration, with heavier objects requiring more force for equal acceleration.
Submitted by: PaperMCQs
5
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
6
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
7
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
8
Easy pms Uploaded: 06 Aug 2026

What is the term for the bending of light as it passes from one medium to another?

  • A Reflection
  • B Diffraction
  • C Dispersion
  • D Refraction
Permalink
Correct Answer: Option D — Refraction
Explanation: Refraction occurs when light changes speed and direction as it passes between media of different densities, such as air and water. This bending effect explains why a straw appears bent when partially submerged in water.
Submitted by: PaperMCQs
9
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
10
Easy css Uploaded: 17 Aug 2026

Lenz's law is a consequence of the conservation of:

  • A Mass
  • B Energy
  • C Momentum
  • D Charge
Permalink
Correct Answer: Option B — Energy
Explanation: Lenz's law states that the direction of an induced current opposes the change in magnetic flux that produced it, which is a direct consequence of the law of conservation of energy.
Submitted by: PaperMCQs
11
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
12
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
13
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
14
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
15
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
16
Hard css Uploaded: 17 Aug 2026

The SI unit of angular velocity is:

  • A degree/s
  • B m/s
  • C rev/s
  • D rad/s
Permalink
Correct Answer: Option D — rad/s
Explanation: Angular velocity measures how fast an object rotates and is expressed in radians per second in the SI system, representing the rate of change of angular displacement over time for a rotating body.
Submitted by: PaperMCQs
17
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
18
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
19
Easy nts Uploaded: 06 Aug 2026

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

  • A Faraday's Law
  • B Kirchhoff's Law
  • C Lenz's Law
  • D Ohm's Law
Permalink
Correct Answer: Option D — Ohm's Law
Explanation: Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it, provided temperature remains constant, expressed as V=IR. This fundamental relationship is essential for analyzing electrical circuits.
Submitted by: PaperMCQs
20
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
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