Class 12

25. Alternating Current question bank (Physics)

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Q1.

The power is transmitted from a power house on high voltage ac because

(A)

Electric current travels faster at higher volts

(B)

It is more economical due to less power wastage

(C)

It is difficult to generate power at low voltage

(D)

Chances of stealing transmission lines are minimized

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Q2.

The potential difference \( V \) and the current \( i \) flowing through an instrument in an ac circuit of frequency \( f \) are given by
\( V = 5 \cos \omega t \) volts and \( I = 2 \sin \omega t \) amperes, where \( \omega = 2\pi f \). The power dissipated in the instrument is

(A)

Zero

(B)

10 W

(C)

5 W

(D)

2.5 W

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