AIIMS Physics: Questions 193 - 197 of 500

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Question number: 193

» Communication System » Sky and Space Wave Propagation

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.

2 MHz

b.

12 MHz

c.

10 MHz

d.

18 MHz

Question number: 194

» Electronic Devices » Semiconductors

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.

an insulator

b.

a p-type semiconductor

c.

a n-type semiconductor

d.

a conductor

Question number: 195

» Oscillations and Waves » Longitudinal and Transverse Waves

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.

propagated waves

b.

Longitudinal waves

c.

Transverse waves

d.

stationary waves

Question number: 196

» Electronic Devices » Junction Transistor

Appeared in Year: 2003

MCQ▾

Question

In the following common emitter configuration an ‘NPN’ transistor with current gain β=100 is used the output voltage of amplifier will be –

Choices

Choice (4) Response

a.

0.1V

b.

10V

c.

10 mV

d.

1.0 V

Question number: 197

» Electronic Devices » Semiconductors

Appeared in Year: 2005

MCQ▾

Question

In semiconducting material the mobility of electrons and holes are μe and μh respectively. Which of the following is true?

Choices

Choice (4) Response

a.

μe<μh

b.

μe=μh

c.

μe<0;μh>0

d.

μe>μh

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