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Heat, Light and Sound


13. 

Through a soap film, different colours are seen by white light because of the phenomenon of

Answer : A. Interference

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14. 

A decibel is

Answer : A. the relative intensity of sound

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15. 

Optical fibre works on the principle of

Answer : A. total internal reflection

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16. 

The colour of an opaque object is due to the colour it

Answer : C. reflects

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17. 

Reed instrument without pipe is

Answer : B. Harmonium

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18. 

Arrange the following colours in increasing order of wavelength
i) orange
ii) indigo
iii) yellow
iv) violet

Answer : C. iv,ii,iii,i

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