Electromagnetic Induction & Alternating Currents-Alternating Currents (NEET Physics): Questions 1 - 4 of 9

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

Question

The instantaneous value of current in an A. C. circuit is I=2sin(100πt+π3)A . The current will be maximum for the first time at,

Choices

Choice (4) Response
a.

t=1100s

b.

t=1600s

c.

t=1400s

d.

t=1200s

Question number: 2

» 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: 3

» Electromagnetic Induction & Alternating Currents » Alternating Currents

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)

Here in figure voltage across a pure inductor is represented.

Choices

Choice (4) Response
a.
Diagram of current vs time (choice 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)

Diagram of Current vs Time (Choice B)

In figure current i→t (time) graph is indicate.

c.
Diagram of current vs time (Choice 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)

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

Assertion-Reason▾

Assertion (Ꭺ)

The alternating current lags behind the emf by a phase angle of π2 , 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 but Ꭱ is NOT the correct explanation of Ꭺ

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