Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?

(a)

stretched strings

(b)

stretched membranes

(c)

air columns

(d)

metal plates

Which of the following statement best describes frequency?

(a)

the number of complete vibrations per second.

(b)

the distance travelled by a wave per second.

(c)

the distance between one crest of wave and the next one.

(d)

the maximum disturbance caused by a wave.

In the sound wave produced by a vibrating turning fork as shown in the diagram, half the wave length is represented by:

(a)

BD

(b)

AB

(c)

AE

(d)

DE

When the pitch of note by a harmonium is lowered, then the wave length of the note

(a)

first decreases and then increases

(b)

decreases

(c)

remains the same

(d)

increases

The velocities of sound waves in four media P, O, Q, R and S are 18,00 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which could be a liquid medium?

(a)

R

(b)

Q

(c)

P

(d)

S

Vibration of object produces_________.

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sound

Number of vibrations produced in one second is ____________

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Frequency

____________ is a medical instrument used for listening to sounds produced in the body.

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Stethoscope

In the inner ear, the pressure variations are turned into electrical signals by the _______ .

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cochlea

Tuning fork

(1)

Longitudinal wave

Ultrasonics

(2)

The sound whose frequency is greater than 20,000 Hz

Amplitude

(3)

The maximum displacement from the mean position - Metre

Frequency

(4)

Number of vibrations produced in unit time - Hertz

Name the device which is used to produce sound in laboratory experiments.

Can sound travel through vacuum?

What is meant by supersonic speed?

A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. Calculate the number of seconds for the splash to be heard?
(Given g = 10 m s^–2 and speed of sound = 340 m s^–1)

List the applications of sound.