MCQ
SI unit of electrical energy is:
- AJoule
- BKilowatt hour
- CKiloJoule
- DWatt hour
Explanation:
SI unit of electrical energy is Joule.
1 Joule = 1 Volt × 1 ampere × 1 second.
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To find the focal length of a concave mirror, Sita should choose which one of the following set-ups?
The correct properties are: