# Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 69 - 74 of 124

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## Question number: 69

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

### Question

A resistance of 20Ω is connected to a source of an alternating potential V = 220 sin (100πt). The time taken by the current to change from its peak value to r. m. s value is,

### Choices

Choice (4) Response

a.

0.25 sec

b.

0.2 sec

c.

2.5 x 10 -3 sec

d.

25 x 10 -3 sec

## Question number: 70

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

### Question

In an ac circuit . The time required for the current to achieve its peak value will be

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 71

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

### Question

In a circuit, the value of alternating current is measured by hot wire ammeter as 10 ampere. Its peak value will be

### Choices

Choice (4) Response

a.

20 A

b.

14.14 A

c.

7.07 A

d.

10 A

## Question number: 72

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

### Question

The peak value of an alternating e. m. f. E given by E = E 0 cos t is 10 volts and its frequency is 50 Hz. At time , the instantaneous e. m. f. is

### Choices

Choice (4) Response

a.

1 V

b.

10 V

c.

5 V

d.

## Question number: 73

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

### Question

A transformer has turn ratio 100: 1. If secondary coil has 4 amp current then current in primary coil is

### Choices

Choice (4) Response

a.

4 A

b.

0.04 A

c.

400 A

d.

0.4 A

## Question number: 74

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

### Question

An inductor (L = 100 mH), a resistor (R = 100Ω) and a battery (E = 100 V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit 1 ms after the short circuit is

### Choices

Choice (4) Response

a.

1 A

b.

0.1 A

c.

e A

d.

f Page