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Physics MCQs

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What is the SI unit of electric current?

  • A Volt
  • B Ohm
  • C Ampere
  • D Watt
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Correct Answer: Option C — Ampere
Explanation: The Ampere named after French physicist Andre-Marie Ampere is the SI base unit of electric current representing the flow of one coulomb of charge per second.
Submitted by: PaperMCQs
122
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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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123
Easy nts Uploaded: 17 Aug 2026

The SI unit of temperature is:

  • A Celsius
  • B Kelvin
  • C Joule
  • D Fahrenheit
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Correct Answer: Option B — Kelvin
Explanation: The Kelvin scale is the SI unit of temperature, with its zero point set at absolute zero, the theoretical point where all molecular motion ceases, making it essential for scientific calculations.
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124
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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125
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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.
Submitted by: PaperMCQs
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