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Physics MCQs

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81
Hard css fpsc Uploaded: 13 Jul 2026

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
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Correct Answer: Option D — Heisenberg Uncertainty Principle
Explanation: Heisenberg's Uncertainty Principle states that the more precisely the position of a particle is determined the less precisely its momentum can be known and vice versa.
Submitted by: PaperMCQs
82
Hard nts Uploaded: 17 Aug 2026

A standing wave is formed by the superposition of:

  • A Two waves of different amplitudes only
  • B Two identical waves traveling in opposite directions
  • C Two waves of different frequencies
  • D A wave and a particle
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Correct Answer: Option B — Two identical waves traveling in opposite directions
Explanation: A standing wave results from the interference of two waves of equal frequency and amplitude traveling in opposite directions along the same medium, creating fixed points called nodes and antinodes.
Submitted by: PaperMCQs
83
Hard nts Uploaded: 17 Aug 2026

Which of the following is a common type of transistor?

  • A LED
  • B BJT
  • C LCD
  • D LDR
Permalink
Correct Answer: Option B — BJT
Explanation: The Bipolar Junction Transistor (BJT) is one of the most common types of transistors, consisting of three semiconductor regions and widely used for amplification and switching applications in electronic circuits.
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84
Hard pms Uploaded: 17 Aug 2026

The gravitational force between two objects increases when:

  • A Distance between them increases
  • B Distance between them decreases
  • C Mass of both objects decreases
  • D Distance and mass both decrease
Permalink
Correct Answer: Option B — Distance between them decreases
Explanation: According to Newton's law of gravitation, gravitational force is inversely proportional to the square of the distance between two objects, so as the distance decreases, the force of attraction between them increases.
Submitted by: PaperMCQs
85
Hard fpsc Uploaded: 17 Aug 2026

Which type of friction is generally the smallest?

  • A Static friction
  • B Kinetic friction
  • C Sliding friction
  • D Rolling friction
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Correct Answer: Option D — Rolling friction
Explanation: Rolling friction is typically much smaller than static or kinetic sliding friction because rolling objects, like wheels, experience less deformation and resistance at the contact point compared to sliding surfaces.
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86
Hard css fpsc Uploaded: 13 Jul 2026

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
Permalink
Correct Answer: Option D — Pauli Exclusion Principle
Explanation: The Pauli Exclusion Principle states that no two electrons in an atom can have identical sets of all four quantum numbers meaning each orbital can hold at most two electrons with opposite spins.
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87
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
Permalink
Correct Answer: Option A — Power
Explanation: In an ideal transformer, the input power equals the output power since no energy is lost, meaning any increase in voltage is accompanied by a proportional decrease in current, keeping overall power constant.
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88
Hard fpsc Uploaded: 17 Aug 2026

Which of the following travels fastest in vacuum?

  • A Sound waves
  • B Light waves
  • C Seismic waves
  • D Water waves
Permalink
Correct Answer: Option B — Light waves
Explanation: Light waves, being electromagnetic radiation, travel at approximately 3 x 10^8 metres per second in a vacuum, far faster than mechanical waves like sound, which require a physical medium to propagate.
Submitted by: PaperMCQs
89
Hard pms Uploaded: 17 Aug 2026

The freezing point of water on the Celsius scale is:

  • A 0 degrees
  • B 273 degrees
  • C 100 degrees
  • D 32 degrees
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Correct Answer: Option A — 0 degrees
Explanation: On the Celsius temperature scale, water freezes at 0 degrees Celsius under standard atmospheric pressure, forming the lower reference point of this widely used temperature measurement system.
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