AIIMS Physics: Questions 158 - 162 of 500

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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 20calm2s1 . When its temperature is raised to 727°C, the heat radiated by it in calm2s1 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.

1022m3

b.

1.2×1012m3

c.

106m3

d.

1014m3

Question number: 162

» Oscillations and Waves » Doppler Effect in Sound

Appeared in Year: 2002

MCQ▾

Question

A siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30ms . Frequency of sound to be heard by the listener is (Velocity of sound =330ms )

Choices

Choice (4) Response

a.

644.8 Hz

b.

733.3 Hz

c.

481.2 Hz

d.

286.5 Hz

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