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Physics MCQs

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61
Medium pms Uploaded: 06 Aug 2026

Which of these has the highest specific heat capacity?

  • A Copper
  • B Aluminum
  • C Iron
  • D Water
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Correct Answer: Option D — Water
Explanation: Water has an exceptionally high specific heat capacity of about 4186 J/kg°C, meaning it requires significant energy to change its temperature. This property makes water an excellent coolant and helps regulate Earth's climate by moderating temperature changes.
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62
Easy pms Uploaded: 17 Aug 2026

Total internal reflection occurs when light travels from a:

  • A Denser medium to a rarer medium at any angle
  • B Rarer medium to a denser medium
  • C Denser medium to a rarer medium at an angle greater than the critical angle
  • D Vacuum to a medium
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Correct Answer: Option C — Denser medium to a rarer medium at an angle greater than the critical angle
Explanation: Total internal reflection occurs when light traveling from a denser to a rarer medium strikes the boundary at an angle greater than the critical angle, causing it to be completely reflected internally.
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63
Easy pms Uploaded: 06 Aug 2026

Which unit is used to express the wavelength of visible light?

  • A Nanometer
  • B Meter
  • C Kilometer
  • D Centimeter
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Correct Answer: Option A — Nanometer
Explanation: Wavelengths of visible light are extremely small and are typically measured in nanometers, ranging roughly from 380 to 700 nanometers. This range spans the visible spectrum from violet at shorter wavelengths to red at longer ones.
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64
Medium pms Uploaded: 17 Aug 2026

In a transverse wave, particle motion is:

  • A Perpendicular to wave direction
  • B Parallel to wave direction
  • C Random
  • D Circular
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Correct Answer: Option A — Perpendicular to wave direction
Explanation: In a transverse wave, the particles of the medium vibrate perpendicular to the direction in which the wave itself travels, as seen in waves on a string or electromagnetic waves like light.
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65
Easy pms Uploaded: 17 Aug 2026

The half-life of a radioactive substance is the time taken for:

  • A All of it to decay
  • B One-fourth of it to decay
  • C Half of it to decay
  • D None of it to decay
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Correct Answer: Option C — Half of it to decay
Explanation: Half-life is defined as the time required for exactly half of the radioactive nuclei in a given sample to undergo decay, and it is a characteristic constant for each radioactive isotope.
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66
Medium pms Uploaded: 06 Aug 2026

What is the term for the total kinetic and potential energy possessed by molecules within a substance?

  • A Heat
  • B Temperature
  • C Internal energy
  • D Specific heat
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Correct Answer: Option C — Internal energy
Explanation: Internal energy represents the sum total of kinetic and potential energy possessed by all the particles within a substance, arising from their random motion and intermolecular interactions, distinct from the substance's overall temperature reading.
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67
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.
Submitted by: PaperMCQs
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