Question # 1

Astronauts is space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space.

Sound waves travel very fast in speace

Sound waves cannot travel in space

Sound waves have low frequency in space

After how much time the echo must be heard?

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0.1 s

0.10 s

0.20 s

0.50 s

The product of frequency and wavelength is equal to:

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Time period

Amplitude

Wave speed

Wave energy

The unit of spring constant is:

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m

kg

Nm²

Nm^-1

At mean position of pendulum, the potential energy of the pendulum is:

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Maximum

Minimum

Much more

Both a and c

The force applied on the mass attached with a spring is represented by:

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f_a

f_c

f_ext

f_s

The difference between the loudness of faintest audible sound and loudness of another sound is called:

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Pitch of sound

Quality of sound

Sound level

Intensity of sound

Old people can not hear sound above then _____ Hz

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1000

15000

20000

10000

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly ………. To the wavelength of the wave:

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Two times

Equal

Four times

Half

High pitch means:

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High wavelength

High frequency

High time period

High energy

What is fitted in telephone receiver:

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Electromagnet

Diaphragm

Both a and b

None

1 GB =

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1022MB

1023 MB

1024MB

1025MB

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