# Electromagnetic Induction & Alternating Currents-Resonance [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 6 of 7

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## Question number: 1

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MCQ▾

### Question

The coefficient of induction of a choke coil is 0.1 H and resistance is 12Ω. If it is connected to an alternating current source of frequency 60 Hz, then power factor is approximately

### Choices

Choice (4)Response

a.

0.1

b.

0.30

c.

0.2

d.

0.4

## Question number: 2

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MCQ▾

### Question

This circuit will resonate at ω equal to,

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 3

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MCQ▾

### Question

The resonant frequency of a circuit is f. If the capacitance is made 4 times the initial values, then the resonance frequency will become

### Choices

Choice (4)Response

a.

f

b.

c.

174

d.

Both b. and c. are correct

## Question number: 4

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MCQ▾

### Question

A 10 ohm resistance, 5 mH inductance coil and 10 µF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency

### Choices

Choice (4)Response

a.

is halved

b.

c.

remains unchanged

d.

is doubled

## Question number: 5

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MCQ▾

### Question

The power factor of LCR circuit at resonance is

### Choices

Choice (4)Response

a.

1

b.

0.707

c.

0.5

d.

Zero

## Question number: 6

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MCQ▾

### Question

The phase difference between the current and voltage of LCR circuit in series combination at resonance is

### Choices

Choice (4)Response

a.

b.

π

c.

d.

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