AIIMS (All India Institute of Medical Sciences) Physics: Questions 192 - 196 of 500

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Question number: 192

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

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Appeared in Year: 2003

MCQ▾

Question

The maximum distance up to which TV transmission from a TV tower of height h can be received is proportional to –

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 193

» Communication System » Sky and Space Wave Propagation

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Appeared in Year: 2003

MCQ▾

Question

In short wave communication waves of which of the following frequencies will be reflected back by the ionosphere layer having electron density 1011 per m3?

Choices

Choice (4)Response

a.

10 MHz

b.

18 MHz

c.

2 MHz

d.

12 MHz

Question number: 194

» Electronic Devices » Semiconductors

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Appeared in Year: 2003

MCQ▾

Question

To a germanium sample, traces of gallium are added as an impurity. The resultant sample could behave like –

Choices

Choice (4)Response

a.

a p-type semiconductor

b.

a n-type semiconductor

c.

an insulator

d.

a conductor

Question number: 195

» Oscillations and Waves » Longitudinal and Transverse Waves

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Appeared in Year: 1998

MCQ▾

Question

The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as –

Choices

Choice (4)Response

a.

stationary waves

b.

Transverse waves

c.

propagated waves

d.

Longitudinal waves

Question number: 196

» Electronic Devices » Junction Transistor

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Appeared in Year: 2003

MCQ▾

Question

In the following common emitter configuration an ‘NPN’ transistor with current gain is used the output voltage of amplifier will be –

Choices

Choice (4)Response

a.

10V

b.

0.1V

c.

1.0 V

d.

10 mV

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