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Physics MCQs

176 Questions
Subject Preparation Guide

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Practice core concepts of measurement, motion, force, energy, waves, electricity, magnetism and modern physics.

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Hard css fpsc ppsc Uploaded: 13 Jul 2026

What is the angle of incidence when a ray of light undergoes total internal reflection?

  • A Less than the critical angle
  • B Equal to 90 degrees
  • C Greater than the critical angle
  • D Equal to 45 degrees
2
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Which phenomenon causes a spinning top to precess rather than fall over immediately?

  • A Conservation of energy
  • B Magnetic force
  • C Gyroscopic effect
  • D Centripetal force only
3
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What is the approximate speed of sound in air at room temperature?

  • A 343 m/s
  • B 150 m/s
  • C 1500 m/s
  • D 3000 m/s
4
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Which law states that energy radiated by a black body is proportional to the fourth power of its temperature?

  • A Stefan-Boltzmann Law
  • B Boltzmann's Law
  • C Wien's Law
  • D Newton's Cooling Law
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Which law states that planets move in elliptical orbits with the sun at one focus?

  • A Newton's Law of Gravitation
  • B Galileo's Law of Motion
  • C Kepler's First Law
  • D Hubble's Law
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Which particle is responsible for carrying the electromagnetic force?

  • A Neutrino
  • B Boson
  • C Photon
  • D Gluon
7
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The focal length of a plane mirror is:

  • A Zero
  • B Infinite
  • C Equal to radius of curvature
  • D Negative
8
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Which device stores electrical energy in an electric field between two conductors?

  • A Inductor
  • B Resistor
  • C Transformer
  • D Capacitor
9
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What does Einstein's mass-energy equivalence equation state?

  • A E equals mv squared
  • B E equals mc squared
  • C E equals half mc squared
  • D E equals mc
10
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Which type of lens converges parallel light rays to a single focal point?

  • A Concave lens
  • B Convex lens
  • C Diverging lens
  • D Cylindrical lens
11
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Resonance occurs when the frequency of an external force matches the:

  • A Speed of a system
  • B Natural frequency of a system
  • C Wavelength of a system
  • D Amplitude of a system
12
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Which colour of visible light has the longest wavelength?

  • A Red
  • B Violet
  • C Blue
  • D Green
13
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According to Kepler's third law, the square of the orbital period of a planet is proportional to:

  • A Its mass
  • B The cube of its distance from the Sun
  • C Its velocity
  • D The square of its distance from the Sun
14
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What is the term for the process of converting alternating current into direct current?

  • A Induction
  • B Amplification
  • C Rectification
  • D Transformation
15
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Which phenomenon explains why the sky appears blue?

  • A Scattering of blue light by atmospheric molecules
  • B Reflection of ocean colour
  • C Absorption of blue light by clouds
  • D Refraction through ice crystals
16
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Which phenomenon explains why objects appear to weigh less when submerged in water?

  • A Surface tension
  • B Buoyancy
  • C Cohesion
  • D Adhesion
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Which particle in an atom has no electric charge?

  • A Proton
  • B Electron
  • C Neutron
  • D Photon
18
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What is polarisation of light?

  • A Splitting light into its spectrum
  • B Restriction of light vibrations to a single plane
  • C Bending of light around obstacles
  • D Total reflection of light
19
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Which property of a body is measured by the amount of matter it contains?

  • A Weight
  • B Density
  • C Mass
  • D Volume
20
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Which principle states that pressure in a static fluid increases with depth depending on fluid density?

  • A Bernoulli's Principle
  • B Archimedes' Principle
  • C Pascal's Principle
  • D Hydrostatic pressure principle