# Electromagnetic Induction & Alternating Currents-Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 22

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## Question number: 1

» Electromagnetic Induction & Alternating Currents » Alternating Currents

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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: 2

» Electromagnetic Induction & Alternating Currents » Alternating Currents

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MCQ▾

### Question

The frequency of ac mains in India is

### Choices

Choice (4) Response

a.

60 c/s or Hz

b.

50 c/s or Hz

c.

120 c/s or Hz

d.

30 c/s or Hz

## Question number: 3

» Electromagnetic Induction & Alternating Currents » Alternating Currents

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MCQ▾

### Question

The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current? Graph of v→T (As Cos Function) Here in figure voltage across a pure inductor is represented.

### Choices

Choice (4) Response

a. Diagram of Current vs Time (Choice A) In figure current i→t (time) graph is indicate.

b. Diagram of Current vs Time (Choice B) In figure current i→t (time) graph is indicate.

c. Diagram of Current vs Time (Choice C) In figure current i→t (time) graph is indicate.

d. Diagram of Current vs Time (Choice D) In figure current i→t (time) graph is indicate.

## Question number: 4

» Electromagnetic Induction & Alternating Currents » Alternating Currents

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Assertion-Reason▾

### Assertion (Ꭺ)

The alternating current lags behind the emf by a phase angle of , when ac flows through an inductor.

### Reason (Ꭱ)

The inductive reactance increases as the frequency of ac source decreases.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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