Physics
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:

The heating effect of current alone
Both the heating effect of current and hysteresis loss
Intense sunlight at noon
Hysteresis loss alone

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.
None of these

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