22500+ Important MCQs for NDA

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Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) What type of energy transformation occurs in an electric iron?

  • (A) Mechanical to electrical
  • (B) Electrical to heat
  • (C) Heat to electrical
  • (D) Chemical to heat
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Correct Answer - Option (B)

Explanation :

In an electric iron, electrical energy is converted into heat energy for ironing clothes.

S

Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) Which phenomenon explains the twinkling of stars?

  • (A) Reflection
  • (B) Refraction
  • (C) Dispersion
  • (D) Diffraction
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Correct Answer - Option (B)

Explanation :

Twinkling occurs due to atmospheric refraction — light from stars bends as it passes through layers of air.

S

Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) Which of the following devices converts sound energy into electrical energy?

  • (A) Speaker
  • (B) Microphone
  • (C) Amplifier
  • (D) Transistor
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Correct Answer - Option (B)

Explanation :

A microphone converts sound (mechanical vibrations) into electrical signals.

S

Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) Which color of light has the highest frequency?

  • (A) Red
  • (B) Yellow
  • (C) Violet
  • (D) Green
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Correct Answer - Option (C)

Explanation :

Among visible light, violet has the shortest wavelength and thus the highest frequency.

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