Electromagnetic Induction & Alternating Currents (AIIMS Physics): Questions 18 - 21 of 51

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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

Question number: 19

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

Appeared in Year: 1997

MCQ▾

Question

The primary winding of a transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to a supply of 20 V, 50 Hz. The secondary will have an output of – [AIPMT]

Choices

Choice (4) Response

a.

2 V, 5 Hz

b.

2 V, 50 Hz

c.

200 V, 50 Hz

d.

200 V, 500 Hz

Question number: 20

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

Appeared in Year: 1998

MCQ▾

Question

Transformer works on the basis of the following phenomenon –

[AIIMS, RPMT-89]

Choices

Choice (4) Response

a.

Electrical discharge

b.

Mutual induction

c.

Self-induction

d.

Generation of electro-magnetic waves.

Question number: 21

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

Appeared in Year: 2003

MCQ▾

Question

A capacitor of capacitance 2µF is connected in the tank circuit of an oscillator oscillating with a frequency of 1 kHz. If the current flowing in the circuit is 2 mA, the voltage across the capacitor will be – [AIIMS]

Choices

Choice (4) Response

a.

159 V

b.

0.32 V

c.

0.16 V

d.

79.5 V

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