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Q.

When an electric bulb is turned on

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a

90% of electricity is converted in to light

b

10%  of electricity is converted in to light

c

None

d

20% of electricity is converted in to light

answer is A.

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Detailed Solution

When an electric bulb is turned on only 10 % of electricity was utilized and 90% of electricity was wasted in the form of heat.
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