Question : Decibel is the unit used for:
Option 1: speed of light
Option 2: intensity of heat
Option 3: intensity of sound
Option 4: radio wave frequency
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Correct Answer: intensity of sound
Solution : The correct answer is the intensity of sound.
Decibel is the unit of intensity of sound. It is a measure of the loudness of the sound on a logarithmic scale. When the level of sound increases by 3 decibels, the intensity of the sound is doubled. It is abbreviated as 'dB'.
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Question : The SI unit of work is ______.
Option 1: decibel
Option 2: joule
Option 3: pascal
Option 4: hertz
Question : The characteristic invalid for heat radiation is that it travels
Option 1: in a straight line
Option 2: in all directions
Option 3: with the speed of light
Option 4: heating the medium through which it passes
Question : Heat stored in water vapour is:
Option 1: Specific heat
Option 2: Latent heat
Option 3: Absolute heat
Option 4: Relative heat
Question : What is speed?
Option 1: It is the distance covered by an object in a unit of time
Option 2: It is the velocity of an object per unit time
Option 3: It is the force applied on covering a unit distance
Option 4: It is the acceleration of an object per unit time
Question : Of the options listed below, the speed of sound is highest in _____ at 25°C.
Option 1: Ethanol
Option 2: Aluminium
Option 3: Oxygen
Option 4: Hydrogen
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