21000+ Important MCQs for UPSC

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Learn UPSC MCQs with answers [Page 2938 ]

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Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) Which of the following is not a scalar quantity?

  • (A) Mass
  • (B) Velocity
  • (C) Temperature
  • (D) Energy
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Correct Answer - Option (B)

Explanation :

Velocity is a vector quantity because it has both magnitude and direction.

S

Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) Which instrument is used to measure electric current?

  • (A) Voltmeter
  • (B) Ammeter
  • (C) Galvanometer
  • (D) Ohmmeter
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Correct Answer - Option (B)

Explanation :

An ammeter measures electric current and is connected in series with the circuit.

S

Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) Who discovered the law of universal gravitation?

  • (A) Albert Einstein
  • (B) Isaac Newton
  • (C) Galileo Galilei
  • (D) Niels Bohr
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Correct Answer - Option (B)

Explanation :

Sir Isaac Newton formulated the law of universal gravitation describing the attraction between two masses.

S

Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) Which property of light proves that it travels in a straight line?

  • (A) Reflection
  • (B) Refraction
  • (C) Rectilinear propagation
  • (D) Interference
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Correct Answer - Option (C)

Explanation :

Rectilinear propagation explains that light travels in straight lines, proven by the formation of shadows.

S

Sikhar Chaudhary • 5.88K Points
Tutor III Physics

Q) Which of the following is an example of periodic motion?

  • (A) A ball rolling on a floor
  • (B) A pendulum swinging
  • (C) A car moving on a road
  • (D) A stone dropped from a height
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Correct Answer - Option (B)

Explanation :

A pendulum’s motion repeats at regular intervals, making it periodic motion.

S

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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