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Heat, Light and Sound


7. 

The process in which heat is transmitted without the aid of the intervening medium is

Answer : C. Radiation

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8. 

When a mirror is rotated by an angle of θ, the reflected ray will rotate by

Answer : D. 2θ

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9. 

Sound is not audible in moon. Why?

Answer : B. moon does not have atmosphere

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10. 

Heat waves are otherwise known as

Answer : C. Solar radiation

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11. 

Light from the Laser is

Answer : A. Monochromatic

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12. 

suppose a rocket ship is receding from the earth at a speed of 1/10 of velocity of light. A light in the rocket ship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth?

Answer : C. yellow

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