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Primary and Secondary Cell

Fill in the b...

Question

Fill in the blanks:
1 kg coal can light up 1 bulb for _____ hours.

A

6

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B

8

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C

7

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D

5

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Solution

The correct option is B 8
1 kg of coal can light the bulb for 8 hours whereas 1 kg of uranium can light the bulb for 3 x 10 $^{4}$ years.

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Standard VII Physics

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