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Heat, Light and Sound


19. 

Audio cassettes are coated with which oxide?

Answer : D. iron

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20. 

Transfer of heat by molecular collision is

Answer : B. conduction

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21. 

Colour formation in the films is due to

Answer : C. Interference

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22. 

The one used in the preparation of lenses and prisms

Answer : B. Flint glass

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23. 

Name the organism which flies with the help of ultrasonics?

Answer : B. bat

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24. 

Which of the following regulates and controls the entry of light into human eye?

Answer : B. iris

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