# Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 19 - 24 of 124

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## Question number: 19

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

### Question

A 120 Volt ac source is connected across a pure inductor of inductance 0.70 H. If the frequency of the ac source is 60 Hz, the current passing through the inductor is

### Choices

Choice (4) Response

a.

4.55 amp

b.

3.55 amp

c.

0.355 amp

d.

0.455 amp

## Question number: 20

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

### Question

The instantaneous value of current in an A. C. circuit is . The current will be maximum for the first time at,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 21

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

### Question

Two rail tracks, insulated from each other and the ground, are connected to milli voltmeter. What is the reading of the milli voltmeter when a train passes at a speed of 180 km/hr along the track? Given that - the horizontal component of earth’s magnetic field B H is 0.2 x 10 -4 Wb/m 2 and rails are separated by 1 meter.

### Choices

Choice (4) Response

a.

1 V

b.

10 mV

c.

l mV

d.

100 mV

## Question number: 22

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

### Question

The frequency of ac mains in India is

### Choices

Choice (4) Response

a.

50 c/s or Hz

b.

30 c/s or Hz

c.

120 c/s or Hz

d.

60 c/s or Hz

## Question number: 23

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

### Question

A step up transformer has transformation ratio 5: 3. What is voltage in secondary if voltage in primary is 60 V.

### Choices

Choice (4) Response

a.

180 V

b.

20 V

c.

100 V

d.

60 V

## Question number: 24

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

### Question

Three inductances are connected as shown below. Assuming no coupling, the resultant inductance will be- (L 1 = 0.75 H, L 2 = L 3 = 0.5 H)

### Choices

Choice (4) Response

a.

0.75 H

b.

0.01 H

c.

0.25 H

d.

1 H

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