Q51. Which metal is used for making coins?
Correct: Nickel
Nickel is commonly used in coins.
Q52. What is the unit of capacitance?
Correct: Farad
Capacitance is measured in Farad.
Q53. Which machine part reduces friction?
Correct: Bearing
Bearings reduce friction.
Q54. Which fuel is used in thermal power plants?
Correct: Coal
Coal is commonly used.
Q55. What is the unit of sound intensity?
Correct: Decibel
Sound intensity is measured in decibel.
Q56. Which metal is corrosion resistant?
Correct: Aluminum
Aluminum resists corrosion.
Q57. Which device measures speed of rotation?
Correct: Tachometer
Tachometer measures rotational speed.
Q58. What is the unit of angle?
Correct: Radian
Angle is measured in radian.
Q59. Which law is used in heat transfer?
Correct: Newton's law of cooling
Newton's law of cooling applies to heat transfer.
Q60. Which device stores electrical energy?
Correct: Capacitor
Capacitor stores electrical energy.
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