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Q.

The biggest unit of energy is


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a

Joule

b

Kilowatt-hour

c

Erg

d

Electron volt 

answer is B.

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Detailed Solution

The biggest unit of energy is the kilowatt-hour.
Energy is defined as the ability to do some work. Its SI unit is the joule.
Now we convert each of the given units into the joule we get,
1 kilowatt-hour= 3.6×106joule
1 erg= 10-7joule
1 electron-volt= 1.6×10-19joule
So kilowatt-hour is the biggest unit of energy among these.
 
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