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Heat, Light and Sound

1. 

The speed of light will be minimum while passing through

A. glass B. vacuum C. water D. air

Answer : A. glass

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2. 

"Decibal" is a unit of

A. sound intensity B. Light C. Heat D. Electricity

Answer : A. sound intensity

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3. 

The unit of refractive index is

A. Metre B. Degree C. No unit D. Second

Answer : C. No unit

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4. 

Light year is the unit of

A. distance B. time C. weight D. intensity of light

Answer : A. distance

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5. 

The unit of power of a lens is

A. decibal B. pascal C. diopter D. stoke

Answer : C. diopter

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6. 

Doppler effect in sound produces apparent change in

A. amplitude B. frequency C. wavelength D. intensity

Answer : B. frequency

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