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

A) the heating effect of current alone
B) hysteresis loss alone
C) both the heating effect of current and hysteresis loss
D) intense sunlight at noon

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Pa(Pascal) is the unit for

A) thrust
B) pressure
C) frequency
D) conductivity

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Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

A) will overflow
B) will not rise
C) depressed
D) change its meniscus

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Nuclear sizes are expressed in a unit named.

A) Fermi
B) angstrom
C) newton
D) tesla

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Mirage is due to

A) unequal heating of different parts of the atmosphere
B) magnetic disturbances in the atmosphere
C) depletion of ozone layer in the atmosphere
D) equal heating of different parts of the atmosphere

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