AIIMS (All India Institute of Medical Sciences) Physics: Questions 157 - 161 of 500

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Question number: 157

» Electronic Devices » Junction Transistor

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.

10 mA

b.

1.01mA

c.

1.1 mA

d.

0.01 mA

Question number: 158

» Oscillations and Waves » Speed of a Wave

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.

20 cm/s

b.

200 cm/s

c.

100 cm/s

d.

50 cm/s

Question number: 159

» Oscillations and Waves » Speed of a Wave

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.

20N

b.

40N

c.

80N

d.

10N

Question number: 160

» Dual Nature of Matter and Radiation » Black-Body Radiation

Appeared in Year: 2003

MCQ▾

Question

A black body, at a temperature of 227°C, radiates heat at a rate of. When its temperature is raised to 727°C, the heat radiated by it in will be closest to –

Choices

Choice (4) Response

a.

40

b.

640

c.

320

d.

160

Question number: 161

» Communication System » Sky and Space Wave Propagation

Appeared in Year: 2005

MCQ▾

Question

For sky wave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere –

Choices

Choice (4) Response

a.

b.

c.

d.

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