Electromagnetic Induction & Alternating Currents (AIIMS (All India Institute of Medical Sciences) Physics): Questions 14 - 18 of 51

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Question number: 14

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

Appeared in Year: 1995

MCQ▾

Question

The reactance of an inductance of 0.01H for 50 Hz A. C. is – [AIIMS]

Choices

Choice (4) Response

a.

0.84 Ω

b.

3.14 Ω

c.

1.57 Ω

d.

6.28 Ω

Question number: 15

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

Appeared in Year: 1996

MCQ▾

Question

To induce an emf in a coil, the magnetic flux linking [AIIMS]

Choices

Choice (4) Response

a.

Must remain constant

b.

Must increase

c.

Must decrease

d.

Can either increase or decrease

Question number: 16

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

Appeared in Year: 1982

MCQ▾

Question

The current passing through a choke coil of 5 H is decreasing at the rate of. The emf developing across the coil is – [CPMT, MPPMT-90, AIIMS-97]

Choices

Choice (4) Response

a.

2.5 V

b.

– 10 V

c.

10 V

d.

– 2.5 V

Question number: 17

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Appeared in Year: 1997

MCQ▾

Question

In an A. C. circuit containing only capacitance, the current – [AIIMS]

Choices

Choice (4) Response

a.

Lags the voltage by 90°

b.

Leads the voltage by 180°

c.

Leads the voltage by 90°

d.

Remains in phase with the voltage

Question number: 18

» Electromagnetic Induction & Alternating Currents » Lenz's Law

Appeared in Year: 1996

MCQ▾

Question

The bob of a simple pendulum is replaced by a magnet. The oscillations are set along the length of the magnet. A copper coil is added so that one pole of the magnet passes in and out of the coil. The coil is short-circuited. Then which of the following happens? [AIIMS]

Choices

Choice (4) Response

a.

Period decreases

b.

Oscillations are damped

c.

Period does not change

d.

Amplitude increases

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