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Photocells are used

A. in burglar alarms

B. in automotive devices for light switches

C. television cameras

D. All the above

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  4. Out of the following which is an insulator?
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  18. The mixing up of two gases as a result of random motion of molecules is called
  19. The loudness of a sound is determined by
  20. A star contains
  21. The spectrum of white light can be studied by
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  23. In the electrical circuit of a house the fuse acts as
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  27. In the fuse of an electrical installation blows out
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