AIIMS (All India Institute of Medical Sciences) Physics: Questions 155 - 159 of 500

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Question number: 155

» Properties of Solids & Liquids » Heat Transfer » Radiation

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Appeared in Year: 2001

MCQ▾

Question

The color of a star is an indication of its [AIIMS, RPMT 1988,1989]

Choices

Choice (4)Response

a.

Weight

b.

Size

c.

Temperature

d.

Distance

Question number: 156

» Oscillations and Waves » Doppler Effect in Sound

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MCQ▾

Question

A vehicle, with a horn of frequency is moving with a velocity of in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency . Then –

(Take velocity of sound in air 300 m/s)

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 157

» Electronic Devices » Junction Transistor

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Appeared in Year: 2005

MCQ▾

Question

Consider an N – P – N transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current –

Choices

Choice (4)Response

a.

1.1 mA

b.

0.01 mA

c.

10 mA

d.

1.01mA

Question number: 158

» Oscillations and Waves » Speed of a Wave

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Appeared in Year: 2002

MCQ▾

Question

A string in a musical instrument is 50 cm long and its fundamental frequency is 800 Hz. If a frequency of 1000 Hz is to be produced, then required length of string is –

Choices

Choice (4)Response

a.

100 cm/s

b.

20 cm/s

c.

200 cm/s

d.

50 cm/s

Question number: 159

» Oscillations and Waves » Speed of a Wave

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Appeared in Year: 2001

MCQ▾

Question

The tension in a piano wire is 10N. What should be the tension in the wire to produce a note of double the frequency?

Choices

Choice (4)Response

a.

40N

b.

80N

c.

10N

d.

20N

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