# Alternating Current Mcqs

This set of Multiple choice questions and answers focuses on study of Alternating Current in Physics. These questions are chosen from a collection of most authoritative and best reference books on Physics. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Chemical industry job interviews. One should practice our Mcqs to assimilate knowledge on Alternating Current in Physics comprehensively.

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32?

62?

50?

100?

220V

220/ ??2V

110V

220 ??2V

0.9sec

15 sec

1.5x105sec

0.9x102sec

## 4. A changing magnetic flux produces around itself an induced

Magnetic field

Electric field

Electromagnetic force

Artificial gravitational field

## 5. A choke is used as a resistance in

DC circuit

AC circuits

Both AC and DC circuit

Full wave rectifier circuit

Remains

Becomes infinite

Becomes zero

Increases

V?/?2R

V?/?2?R

V?2/?2R

V?2/?2?R

(R+2?fL)

R+1/2?fL

(R2+f2L2)

(R2+4?2f2L2)

## 9. Ammeter connected in an AC circuit measures

Exact value of current

Rms value of current

Net value of current

Peak value of current

1?

5?

7?

7/?2?

I = 2I?Sin(?t/2)

I = 2I?Sin(2?t)

I = 2ISin?t

I = I?sin(2?t)

2A

A

20A

20.66A

6.66A

5.66A

## 14. An alternating current or voltage

Fluctuates off and on

Varies in magnitude alone

Changes its direction again and again

Changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals.

## 15. An alternating potential difference is connected across a pure resistor and the frequency of the supply is varied but the rms value of the voltage is kept constant. The mean rate of heat dissipated from the resistor is

Directly proportional to f

Directly proportional to ??f

Directly proportional to f2

Inversely proportional to f

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