Class 9 Practice Level 2 - Sound - Set 1

Total questions: 25

How does the speed of sound in air change with temperature?

Topic: Speed of Sound

It increases with an increase in temperature.

It decreases with an increase in temperature.

It remains constant regardless of temperature.

It increases then decreases.

None

Which characteristic of sound changes when we increase the volume of the sound?

Topic: Sound Wave Properties

Frequency

Wavelength

Amplitude

Velocity

None

The three tiny bones in the middle ear that transmit sound vibrations are collectively known as:

Topic: Human Ear

Malleus, Incus, and Stapes

Cochlea, Eardrum, and Auditory nerve

Hammer, Anvil, and Stirrup

Both a and c

None

Which of the following is a practical application of the reflection of sound?

Topic: Sound Reflection

Hearing aid

Megaphone

Stethoscope

All of the above

None

Which of the following is an example of resonance?

Topic: Resonance

A singer breaking a glass with their voice

An echo in a canyon

Sound traveling faster in water than in air

The Doppler effect

None

If the frequency of a sound wave is doubled, what happens to its pitch?

Topic: Frequency and Pitch

It remains the same.

It is halved.

It is doubled.

It becomes inaudible.

None

Why does sound travel faster in water than in air?

Topic: Sound and Medium

Water is denser than air.

Water has higher elasticity than air.

Both a and b.

Neither a nor b.

None

Ultrasonic waves are commonly used in which medical application?

Topic: Ultrasonic Sound

X-rays

MRI scans

Ultrasound imaging

CT scans

None

The threshold of hearing for humans is approximately

Topic: Sound Intensity

0 decibels

10 decibels

20 decibels

30 decibels

None

10.

The change in frequency or wavelength of a sound wave due to the relative motion of the source and the observer is called:

Topic: Doppler Effect

Resonance

Echo

Doppler effect

Reflection

None

11.

Which of the following does not affect the speed of sound in a medium?

Topic: Properties of Sound

Temperature

Pressure

Density

Frequency

None

12.

The frequency of a vibrating string is inversely proportional to its:

Topic: Musical Instruments

Length

Tension

Density

Thickness

None

13.

In a sound wave, the region where particles are closest together is called:

Topic: Sound Wave Properties

Compression

Rarefaction

Wavelength

Thickness

None

14.

Sound travels in air by the process of:

Topic: Sound Propagation

Conduction

Convection

Radiation

Wave motion

None

15.

The speed of sound in a medium is directly proportional to:

Topic: Sound and Medium

Density

Temperature

Wavelength

Amplitude

None

16.

The loudness of a sound is measured in terms of its:

Topic: Characteristics of Sound

Frequency

Wavelength

Intensity

Velocity

None

17.

Which part of the ear converts sound vibrations into electrical signals?

Topic: Human Ear

Eardrum

Cochlea

Ear canal

Ossicles

None

18.

Which of the following is an example of reflection of sound?

Topic: Reflection of Sound

Echo

Refraction

Diffraction

Absorption

None

19.

The distance between two consecutive compressions in a sound wave is called:

Topic: Sound Waves

Amplitude

Frequency

Wavelength

Period

None

20.

If the intensity of a sound wave is increased by a factor of 10, the sound level increases by:

Topic: Sound Intensity

1 decibel

10 decibels

20 decibels

100 decibels

None

21.

Which of the following is a use of ultrasonic waves?

Topic: Ultrasonic Sound

Communication

Sonar

Radio broadcasting

None of the above

None

22.

The characteristic of sound that enables us to distinguish between different musical instruments playing the same note is:

Topic: Characteristics of Sound

Loudness

Pitch

Timbre

Amplitude

None

23.

The part of the ear that amplifies sound vibrations is the:

Topic: Human Ear

Eardrum

Cochlea

Ear canal

Ossicles

None

24.

The unit used to measure the frequency of a sound wave is:

Topic: Sound Wave Properties

Decibel

Hertz

Meter

Joule

None

25.

Which of the following materials would sound travel through the fastest?

Topic: Sound Propagation

Air

Water

Wood

Steel

None

1 out of 25

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Class 9 Practice Level 2 - Sound - Set 1

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