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Question

In which of the following photocell is not used?

A
Burglar alarm
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B
Television camera
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C
Automatic street lights
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D
Vacuum cleaner
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Solution

The correct option is D Vacuum cleaner
Electrical energy is directly used up by the vacuum cleaner as it runs a direct current and photocell is a device converting light into electrical energy by producing a voltage. Thus, the vacuum cleaner has no photocell.

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