AIIMS Physics: Questions 318 - 321 of 500

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Question number: 318

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A coil of copper having 1600 turns is placed in a magnetic field (B=4×103T) perpendicular to its plane. The cross sectional area of the coil is 0.07 m2. If it turns through 180° in 0.04 sec, then the induced emf in the coil is –

Choices

Choice (4) Response
a.

22.4 V

b.

2.24 V

c.

0.224 V

d.

224 V

Question number: 319

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

MCQ▾

Question

An organ pipe closed at one end has fundamental frequency of 1000 Hz. The maximum number of overtones generated by this pipe which a normal person can hear is –

Choices

Choice (4) Response
a.

10

b.

8

c.

9

d.

5

Question number: 320

» Thermodynamics » Concept of Temperature

MCQ▾

Question

As in figure below shows plates of same size but of two different materials A and B are connected end to end in thermal contact. The open end of A is kept at 50C and open end of B is kept at 1200C . The ratio of thermal conductivity of A and B is given as KAKB=5 .

Two plates of different materials at different temperature

Two Plates of Different Materials at Different Temperature

In figure two plates of same size but of two different materials A and B are connected end to end in thermal contact. The open end of A is kept at 5C and open end of B is kept at 120 C.

The steady – state temperature of the interface is -

Choices

Choice (4) Response
a.

15.50C

b.

28.40C

c.

24.20C

d.

22.20C

Question number: 321

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

The current passing through a choke coil of 9 H is decreasing at the rate of 3amperesecond . The emf developing across the coil is –

Choices

Choice (4) Response
a.

27 V

b.

-27 V

c.

3 V

d.

– 3.0 V

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