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

The maximum speed of vibrations which produces audible sound will be in

(a)

seawater

(b)

ground glass

(c)

dry air

(d)

Human blood

The sound waves travel faster

(a)

in liquids

(b)

in gases

(c)

in solids

(d)

in vacuum

Which of the following can produce longitudinal waves as well as transverse waves under different conditions?

(a)

TV transmitter

(b)

tuning fork

(c)

water

(d)

slinky

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

The back and forth motion of the object is called ___________.

(a)

Vibration

(b)

Rotation

(c)

Translation

(d)

Linear motion

Vibration of object produces_________.

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sound

Number of vibrations produced in one second is ____________

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Frequency

Loudness is proportional to the square of the ____________.

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Amplitude

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

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Stethoscope

Ultrasounds can also be used to detect cracks and flows in _________ .

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metal blocks

Tuning fork

(1)

Longitudinal wave

Compressions

(2)

The maximum displacement from the mean position - Metre

Ultrasonics

(3)

The sound whose frequency is greater than 20,000 Hz

Amplitude

(4)

Production of sound

Frequency

(5)

Number of vibrations produced in unit time - Hertz

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

What should an object do to produce sound?

Name the physical quantity whose SI unit is ‘hertz’. Define.

What is meant by supersonic speed?

The frequency of a source of sound is 600 Hz. Calculate the number of times it
vibrates in a minute?

What is sound? how it is produced?

What is the condition for hearing Echo.

Radio waves of speed 3 x 10⁸ ms^-1 are reflected off the moon and received back on earth. The time elapsed between the sending of the signal and receiving it back at the earth station is 2.5s. What is the distance of the moon from the earth.

List the applications of sound.

Explain how does SONAR work?