Class 9 Practice Level 1 – Sound

Total questions: 40

Which of the following is a longitudinal wave?

Topic: Nature of Sound

Light waves

Sound waves

Radio waves

X-rays

None

Sound cannot travel through:

Topic: Propagation of Sound

Solids

Liquids

Gases

Vacuum

None

The speed of sound is highest in:

Air

Water

Iron

Vacuum

None

The frequency of a sound wave determines its:

Topic: Frequency and Pitch

Speed

Loudness

Pitch

Amplitude

None

Which of the following is not a characteristic of a musical sound?

Topic: Characteristics of Sound

Pitch

Loudness

Quality

Brightness

None

The part of the human ear that converts sound vibrations into electrical signals is the:

Topic: Human Ear

Eardrum

Cochlea

Auditory canal

Ear ossicles

None

The phenomenon of echo is due to:

Topic: Reflection of Sound

Refraction of sound

Reflection of sound

Absorption of sound

Diffraction of sound

None

Sound travels fastest in:

Topic: Sound in Different Mediums

Air

Water

Steel

Rubber

None

The loudness of a sound is determined by its:

Topic: Properties of Sound

Frequency

Wavelength

Amplitude

Velocity

None

10.

Sound is produced by:

Topic: Vibrations and Sound

Static objects

Vibrating objects

Transparent objects

Non-vibrating objects

None

11.

In which medium is the speed of sound the lowest?

Topic: Speed of Sound

Air

Water

Iron

Vacuum

None

12.

The device used to reflect sound waves in a particular direction is called:

Topic: Reflection of Sound

Microphone

Loudspeaker

Megaphone

Stethoscope

None

13.

The unit of frequency is:

Topic: Sound Wave Properties

Hertz

Decibel

Meter

Joule

None

14.

Which part of the musical instrument vibrates to produce sound?

Topic: Sound Production

Strings in a guitar

Membrane in a drum

Air column in a flute

All of the above

None

15.

The minimum distance required between the source and the reflecting surface to hear an echo is approximately:

Topic: Echo

10 meters

17 meters

34 meters

50 meters

None

16.

The audible range of human hearing is:

Topic: Audible Range

0-20 Hz

20-20,000 Hz

20-200,000 Hz

200-2,000 Hz

None

17.

Sounds with frequencies higher than 20,000 Hz are called:

Topic: Ultrasonic Sound

Infrasonic

Ultrasonic

Audible

Subsonic

None

18.

The loudness of a sound is measured in:

Topic: Sound Intensity

Hertz

Decibels

Meters

Joules

None

19.

Ultrasonic waves are used in:

Topic: Applications of Sound

Radar

Sonar

Lasers

Radio

None

20.

The medium through which sound travels the slowest is:

Topic: Sound Transmission

Solid

Liquid

Gas

Vacuum

None

21.

The frequency of a vibrating string can be increased by:

Topic: Musical Instruments

Increasing the length

Increasing the tension

Increasing the mass

Decreasing the tension

None

22.

The term "timbre" refers to the:

Topic: Sound Properties

Loudness of sound

Frequency of sound

Quality of sound

Speed of sound

None

23.

A tuning fork vibrates to produce sound. What type of vibrations does it produce?

Topic: Vibrations

Transverse

Longitudinal

Circular

Random

None

24.

When a body vibrates with its natural frequency due to an external force, it is called:

Topic: Resonance

Reflection

Refraction

Resonance

Diffraction

None

25.

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

Topic: Sound Wave Properties

Wavelength

Frequency

Amplitude

Velocity

None

26.

Which of the following determines the intensity of sound?

Topic: Sound Intensity

Amplitude

Frequency

Wavelength

Velocity

None

27.

Sound travels faster in:

Topic: Sound and Medium

Hot air

Cold air

Vacuum

Outer space

None

28.

Echoes are more distinct when:

Topic: Echo

Reflecting surface is smooth and hard

Reflecting surface is rough and soft

Reflecting surface is uneven

Reflecting surface is irregular

None

29.

The pitch of a sound is determined by its:

Topic: Sound Wave Properties

Amplitude

Frequency

Wavelength

Velocity

None

30.

Which part of the drum vibrates to produce sound?

Topic: Musical Instruments

The shell

The drumhead

The drumsticks

The base

None

31.

Human ears are most sensitive to which frequency range?

Topic: Sound Perception

20-200 Hz

2,000-5,000 Hz

2,000-20,000 Hz

20-20,000 Hz

None

32.

In which of the following does sound travel fastest?

Topic: Sound and Medium

Cold air

Warm water

Ice

Hot air

None

33.

The unit used to measure sound intensity is:

Topic: Sound Properties

Hertz

Decibel

Joule

Newton

None

34.

A sound wave consists of:

Topic: Sound Wave Properties

Crests and troughs

Compressions and rarefactions

Nodes and antinodes

Peaks and valleys

None

35.

Echoes are used in:

Topic: Echo

Radio

Sonar

Television

Mobile phones

None

36.

Ultrasonic waves are used for:

Topic: Ultrasonic Sound

Communication

Cleaning delicate objects

Listening to music

Viewing movies

None

37.

Sound travels faster in:

Topic: Sound and Medium

Solids than in liquids

Liquids than in solids

Gases than in liquids

Gases than in solids

None

38.

The speed of sound in air at room temperature is approximately:

Topic: Speed of Sound

150 m/s

340 m/s

1,500 m/s

3,000 m/s

None

39.

The part of the ear that vibrates first in response to sound waves is the:

Topic: Human Ear

Cochlea

Eardrum

Ear ossicles

Auditory nerve

None

40.

The quality of sound that distinguishes two sounds of the same pitch and loudness is called:

Topic: Characteristics of Sound

Frequency

Amplitude

Timbre

Velocity

None

1 out of 40

Time's up

Class 9 Practice Level 1 – Sound

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