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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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201
Hard css Uploaded: 17 Aug 2026

Which of the following has the highest penetrating power?

  • A Sound waves
  • B Alpha particles
  • C Beta particles
  • D Gamma rays
Permalink
Correct Answer: Option D — Gamma rays
Explanation: Gamma rays have the highest penetrating power among common forms of radioactive emission because they are high-energy electromagnetic waves that can pass through most materials, requiring dense shielding like lead to block them.
Submitted by: PaperMCQs
202
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the formula for kinetic energy?

  • A mv
  • B mgh
  • C half mv squared
  • D Fxd
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Correct Answer: Option C — half mv squared
Explanation: Kinetic energy is calculated using the formula KE equals half multiplied by mass multiplied by velocity squared showing that kinetic energy increases with the square of speed.
Submitted by: PaperMCQs
203
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The value of the universal gravitational constant G is approximately:

  • A 3 x 10^8 m/s
  • B 1.6 x 10^-19 C
  • C 6.67 x 10^-11 N m^2/kg^2
  • D 9.8 m/s^2
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Correct Answer: Option C — 6.67 x 10^-11 N m^2/kg^2
Explanation: The universal gravitational constant G has an approximate value of 6.67 x 10^-11 N m^2/kg^2, and it appears in Newton's law of gravitation to relate force, mass, and distance between two bodies.
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204
Medium ppsc Uploaded: 06 Aug 2026

Which principle explains how airplanes generate lift?

  • A Bernoulli's Principle
  • B Pascal's Principle
  • C Archimedes' Principle
  • D Newton's First Law
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Correct Answer: Option A — Bernoulli's Principle
Explanation: Bernoulli's Principle explains that faster-moving air over the curved upper surface of a wing creates lower pressure compared to the slower air beneath it, generating lift. This pressure difference, combined with airflow deflection, allows airplanes to fly.
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205
Easy css Uploaded: 06 Aug 2026

What is the term for an object floating in equilibrium where buoyant force equals its weight?

  • A Neutral buoyancy
  • B Sinking
  • C Displacement
  • D Density equilibrium
Permalink
Correct Answer: Option A — Neutral buoyancy
Explanation: Neutral buoyancy occurs when the upward buoyant force acting on a floating or submerged object exactly balances its downward weight, resulting in the object remaining suspended without rising or sinking further in the fluid.
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206
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The mathematical form of Ohm's law is:

  • A V = I/R
  • B V = I + R
  • C V = IR
  • D V = I - R
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Correct Answer: Option C — V = IR
Explanation: Ohm's law is mathematically expressed as V equals I multiplied by R, where V is voltage in volts, I is current in amperes, and R is resistance in ohms, for most conductors at constant temperature.
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207
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which formula correctly represents the relationship between frequency wavelength and speed of a wave?

  • A v equals f divided by wavelength
  • B v equals wavelength divided by f
  • C v equals f times wavelength
  • D f equals v times wavelength
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Correct Answer: Option C — v equals f times wavelength
Explanation: The wave equation states that wave speed v equals frequency f multiplied by wavelength lambda showing that for a given medium as frequency increases wavelength decreases proportionally.
Submitted by: PaperMCQs
208
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Which law states that an object at rest stays at rest unless acted upon by an external force?

  • A Newton's Second Law
  • B Newton's Third Law
  • C Law of Inertia and Momentum
  • D Newton's First Law
Permalink
Correct Answer: Option D — Newton's First Law
Explanation: Newton's First Law, also called the law of inertia, states that an object remains at rest or continues moving at constant velocity unless acted upon by an unbalanced external force, describing the natural resistance to change in motion.
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209
Easy css Uploaded: 17 Aug 2026

A calorimeter is used to measure:

  • A Temperature
  • B Pressure
  • C Volume
  • D Heat energy
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Correct Answer: Option D — Heat energy
Explanation: A calorimeter is a device specifically designed to measure the amount of heat energy released or absorbed during a chemical reaction or physical process, based on temperature changes in a known substance.
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210
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Einstein's theory of relativity introduced the concept of:

  • A Zero gravity in space
  • B Relative space and time
  • C Absolute space and time
  • D Fixed speed of all objects
Permalink
Correct Answer: Option B — Relative space and time
Explanation: Einstein's theory of relativity revolutionized physics by proposing that measurements of space and time are relative to the observer's frame of reference, rather than being absolute and universal as previously believed.
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211
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A scalar quantity has:

  • A Only magnitude
  • B Both magnitude and direction
  • C Neither magnitude nor direction
  • D Only direction
Permalink
Correct Answer: Option A — Only magnitude
Explanation: Scalar quantities such as mass, time, speed, and temperature are fully described by their magnitude alone and do not require a direction, unlike vector quantities like force or velocity.
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212
Hard css fpsc ppsc Uploaded: 13 Jul 2026

What is the phenomenon of resonance in physics?

  • A Increase in amplitude when driving frequency matches natural frequency
  • B Decrease in amplitude of oscillations over time
  • C The bending of waves around obstacles
  • D Splitting of white light into colours
Permalink
Correct Answer: Option A — Increase in amplitude when driving frequency matches natural frequency
Explanation: Resonance occurs when a system is driven at its natural frequency causing the amplitude of oscillations to increase dramatically and can be seen in musical instruments and bridges.
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213
Medium nts Uploaded: 06 Aug 2026

Which scientist discovered the electron?

  • A Ernest Rutherford
  • B Niels Bohr
  • C James Chadwick
  • D J.J. Thomson
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Correct Answer: Option D — J.J. Thomson
Explanation: J.J. Thomson discovered the electron in 1897 through his cathode ray tube experiments. He demonstrated that cathode rays consisted of negatively charged particles much smaller than atoms, leading to the plum pudding model of atomic structure.
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214
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Which type of energy is transferred through electromagnetic waves without requiring a medium?

  • A Mechanical energy
  • B Chemical energy
  • C Nuclear energy
  • D Radiant energy
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Correct Answer: Option D — Radiant energy
Explanation: Radiant energy, carried by electromagnetic waves such as light, radio waves, and X-rays, can travel through the vacuum of space without requiring a physical medium, unlike mechanical waves which need matter to propagate.
Submitted by: PaperMCQs
215
Easy nts Uploaded: 17 Aug 2026

Which lens is used to correct hyperopia (farsightedness)?

  • A Convex lens
  • B Concave lens
  • C Cylindrical lens
  • D Plane lens
Permalink
Correct Answer: Option A — Convex lens
Explanation: Hyperopia, or farsightedness, occurs when the eye focuses images behind the retina, and it is corrected using a convex (converging) lens that helps focus light rays properly onto the retina.
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216
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which type of nuclear reaction splits a heavy nucleus into smaller nuclei releasing large amounts of energy?

  • A Nuclear fusion
  • B Radioactive decay
  • C Nuclear fission
  • D Beta decay
Permalink
Correct Answer: Option C — Nuclear fission
Explanation: Nuclear fission splits a heavy nucleus such as uranium-235 into smaller nuclei releasing enormous amounts of energy and is the principle behind nuclear power plants and atomic bombs.
Submitted by: PaperMCQs
217
Medium pms Uploaded: 06 Aug 2026

Which wave property determines the pitch of a sound?

  • A Amplitude
  • B Wavelength
  • C Frequency
  • D Speed
Permalink
Correct Answer: Option C — Frequency
Explanation: The frequency of a sound wave determines its pitch, with higher frequencies producing higher-pitched sounds and lower frequencies producing lower-pitched sounds. Frequency is measured in Hertz, representing the number of wave cycles per second.
Submitted by: PaperMCQs
218
Hard ppsc Uploaded: 17 Aug 2026

A body floats in a liquid when its weight is:

  • A Less than the buoyant force
  • B Independent of buoyant force
  • C Greater than the buoyant force
  • D Equal to the buoyant force
Permalink
Correct Answer: Option D — Equal to the buoyant force
Explanation: A floating body is in equilibrium when the weight of the body acting downward exactly equals the upward buoyant force from the displaced fluid, according to Archimedes' principle of flotation.
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219
Easy ppsc Uploaded: 17 Aug 2026

Like charges:

  • A Repel each other
  • B Neutralize each other
  • C Attract each other
  • D Have no interaction
Permalink
Correct Answer: Option A — Repel each other
Explanation: According to the fundamental laws of electrostatics, like electric charges, whether both positive or both negative, exert a repulsive force on each other, pushing away from one another.
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220
Hard css fpsc Uploaded: 13 Jul 2026

What is the unit of luminous intensity in the SI system?

  • A Lux
  • B Lumen
  • C Watt
  • D Candela
Permalink
Correct Answer: Option D — Candela
Explanation: The Candela is the SI base unit of luminous intensity representing the power emitted by a light source in a particular direction per unit solid angle.
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