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Physics MCQs

42 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
Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which law states that the induced EMF in a conductor is proportional to the rate of change of magnetic flux?

  • A Ohm's Law
  • B Coulomb's Law
  • C Ampere's Law
  • D Faraday's Law
2
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Which effect describes the change in wavelength of X-rays scattered by electrons?

  • A Photoelectric effect
  • B Compton effect
  • C Zeeman effect
  • D Hall effect
3
Hard fpsc Uploaded: 17 Aug 2026

The energy released in nuclear reactions comes from the conversion of:

  • A Sound into light
  • B Chemical energy into heat
  • C Mass into energy
  • D Kinetic energy to heat
4
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What is the critical angle in optics?

  • A Angle at which light travels along the boundary between two media
  • B Angle at which refraction stops
  • C Angle at which a lens focuses parallel rays
  • D Angle of maximum diffraction
5
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Which type of mirror is used in reflecting telescopes?

  • A Plane mirror
  • B Parabolic concave mirror
  • C Convex mirror
  • D Cylindrical mirror
6
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Which principle states that it is impossible to simultaneously know the exact position and momentum of a particle?

  • A Pauli Exclusion Principle
  • B Superposition Principle
  • C Correspondence Principle
  • D Heisenberg Uncertainty Principle
7
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Which type of friction is generally the smallest?

  • A Static friction
  • B Kinetic friction
  • C Sliding friction
  • D Rolling friction
8
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Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

  • A Heisenberg Uncertainty Principle
  • B Superposition Principle
  • C Aufbau Principle
  • D Pauli Exclusion Principle
9
Hard fpsc Uploaded: 06 Aug 2026

Which quantity remains unchanged when a transformer changes voltage in an ideal system?

  • A Power
  • B Current
  • C Resistance
  • D Frequency only
10
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Which of the following travels fastest in vacuum?

  • A Sound waves
  • B Light waves
  • C Seismic waves
  • D Water waves
11
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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
12
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Which fundamental force is responsible for radioactive beta decay?

  • A Gravitational force
  • B Electromagnetic force
  • C Strong nuclear force
  • D Weak nuclear force
13
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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
14
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What is the unit used to measure radioactivity?

  • A Becquerel
  • B Both A and B
  • C Roentgen
  • D Curie
15
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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
16
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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
17
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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
18
Hard fpsc Uploaded: 06 Aug 2026

Which particle is responsible for carrying the electromagnetic force?

  • A Neutrino
  • B Boson
  • C Photon
  • D Gluon
19
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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
20
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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
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