Question # 1

The frequency of silent whistle is:

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20,000 Hz - 25000 Hz

2000 Hz - 25000 Hz

200 Hz - 2000 Hz

25000 Hz

If the intensity of faintest audible sound is Io and of another sound is I then sound level will be:

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K log Io/I

Log Io/I 2K

K log Io/I2

K log I/Io

If there is no extension in the spring then the position is called:

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Equilibrium position

unequilibrium

neutral equilibrium

stable equilibrium

the time period of body attached to spring depend on:

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mass

gravitational constant

length

amplitude

Old people can not hear sound above then _____ Hz

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1000

15000

20000

10000

The advantages of electronic mail are:

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Fast communication

Cost free service

More efficient

All of these

High pitch means:

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High wavelength

High frequency

High time period

High energy

The character by which lound and faint sound can be distinguished is called:

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Pitch

Quality

Loudness

Intensity

The intensity of lawn mover is:

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10^-1 wm^-2

10^-2wm^-2

10^-1wm^-3

10^-3wm^-2

Which is an example of a longitudinal wave?

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Sound wave

Light wave

Radio wave

Water wave

How does sound travel from its source to your ear?

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Byc changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

1 MB =

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1022KB

1023KB

1024KB

1025KB

The energy is transferred from one place of another:

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through matter

through waves

both a and b

through vacuum

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