Electromagnetic Induction & Alternating Currents-Alternating Currents [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 5 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)

Graph of V→T (As Cos Function)

Choices

Choice (4)Response

a.

Diagram of current vs time (choice A)

Diagram of Current vs Time (Choice A)

b.

Diagram of current vs time (Choice B)

Diagram of Current vs Time (Choice B)

c.

Diagram of current vs time (Choice C)

Diagram of Current vs Time (Choice C)

d.

Diagram of current vs time (Choice D)

Diagram of Current vs Time (Choice D)

Question number: 4

» Electromagnetic Induction & Alternating Currents » Alternating Currents

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Assertion-Reason▾

Question

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

Passage

Read the passage given below and answer the questions that follow:

If the voltage in an a c circuit is represented by the eq. , , then

Question number: 5 (1 of 1 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Alternating Currents

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MCQ▾

Question

Frequency of ac is

Choices

Choice (4)Response

a.

75 Hz

b.

c.

d.

50 Hz

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