Sound Wave Questions and Answers Class 10 CBSE 2025

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sound wave Questions and Answers Class 10 cbse for Students

Lightning Flash and Thunder Delay. If lightning is observed and thunder follows after 10 seconds, given the speed of sound as 330 m/s and Light as 3 × 10⁸ m/s, the storm is approximately:

a) About 990 m

b) About 3300 m

c) About 1650 m

d) About 1000 m

Option b – About 3300 m

Time for a 2 kHz sound wave to Travel 211 km (Wavelength 35 cm)

a) 2.1 s

b) 3.0 s

c) 4.1 s

d) 30 s

Option b – 3.0 s

Human Audible Hearing Range

a) 20 Hz – 20 kHz

b) 20 kHz – 200 kHz

c) 20 Hz – 35 kHz

d) 20 Hz – 40 kHz

Option a – 20 Hz – 20 kHz

Property Not True for sound Waves in fluids

a) They Transport energy

b) They require a medium to travel

c) They are transverse

d) They move faster in liquids than in gases

Option c – They are transverse

Characteristic Determining Pitch of a sound wave

a) Speed

b) Loudness

c) Frequency

d) Amplitude

Option c – Frequency

Distance to a Cliff from an Echo Heard After 5 s (sound Speed 340 m/s)

a) 170 m

b) 850 m

c) 1700 m

d) 85 m

Option b – 850 m

Nature of sound and Light Waves in Air

a) sound is longitudinal and Light is transverse

b) Sound is transverse and Light is longitudinal

c) Both are longitudinal

d) Both are transverse

Option a – Sound is longitudinal and Light is transverse

Condition for a Sonic Boom

a) Source travels faster than sound

b) Source travels faster than Light

c) Source travels slower than sound

d) Source travels at the speed of sound

Option a – Source travels faster than sound

Medium Where Sound Travels Fastest

a) Glass

b) Stainless steel

c) Water

d) Oxygen

Option b – Stainless steel

Medium with Maximum Speed of Sound

a) Distilled water

b) Sea water

c) Methanol

d) Drinking water

Option b – Sea water

Time for a 300 Hz Sound wave to Cover 150 Wavelengths

a) 0.5 s

b) 1 s

c) 1.5 s

d) 2 s

Option a – 0.5 s

Correct Statement About High-Pitch Sound

a) High pitch means high frequency

b) High pitch means high amplitude

c) High pitch means high speed

d) High pitch means low frequency and high amplitude

Option a – High pitch means high frequency

Frequency Range of Infrasonic Sound

a) Above 25 kHz

b) 20 kHz to 25 kHz

c) Below 20 Hz

d) 20 Hz to 20 kHz

Option c – Below 20 Hz

Nature of a Sound wave

a) A compression pulse and a rarefaction pulse separated by one wavelength

b) Alternating compression and rarefaction pulses

c) Several rarefaction pulses in sequence

d) Several compression pulses in sequence

Option b – Alternating compression and rarefaction pulses

Phenomenon Causing Prolonged Sound in a Hall

a) Reverberation

b) Dispersion

c) Refraction

d) Diffraction

Option a – Reverberation

Beats Occur When Two Harmonic Waves Have

a) Equal frequencies

b) Nearly identical frequencies

c) Widely different frequencies

d) Frequencies that are multiples of each other

Option b – Nearly identical frequencies

Correct Statement About Sound Propagation

a) Sound travels in vacuum and is transverse in air

b) Sound cannot travel in vacuum and is longitudinal in air

c) Sound travels in vacuum and is longitudinal in air

d) Sound cannot travel in vacuum and is transverse in air

Option b – Sound cannot travel in vacuum and is longitudinal in air

Cause of Reverberation

a) Multiple refraction of sound

b) Multiple reflection of sound

c) Single refraction of sound

d) Single reflection of sound

Option b – Multiple reflection of sound

Unit Same for Ratio of Thrust to Impulse

a) Frequency

b) Speed

c) Wavelength

d) Acceleration

Option a – Frequency

True Statement for Sound Waves in Air

a) Sound is an electromagnetic and transverse wave

b) Sound is a mechanical and longitudinal wave

c) Sound is a mechanical and transverse wave

d) Sound is an electromagnetic and longitudinal wave

Option b – Sound is a mechanical and longitudinal wave

Type of Waves Used by SONAR to Measure Underwater Distance

a) Infrasonic waves

b) Audible sound waves

c) Ultrasonic waves

d) All of the above

Option c – Ultrasonic waves

Question on Sound Speed Misconceptions. Which option below incorrectly describes the speed of sound?

a) Sound travels faster in steel than in water

b) In air, sound speed decreases when temperature rises

c) In air, sound speed increases as temperature rises

d) Sound moves faster in water than in air

Option b – In air, sound speed decreases when temperature rises

Ear Part That Converts Sound to Electrical Signals. Which structure in the human ear converts pressure changes from audible sound into electrical signals?

a) Cochlea

b) Auditory nerve

c) Eustachian tube

d) Eardrum

Option a – Cochlea

Measuring the Amplitude of Sound. Amplitude of a sound wave is expressed in which of these units?

a) Distance

b) Pressure

c) Time

d) Speed

Option a – Distance

Speed of Sound Characteristics in a Medium. Which statement best describes how the speed of sound behaves in a single medium?

a) It stays the same for all frequencies

b) It becomes higher at greater frequencies

c) It becomes lower at greater frequencies

d) It becomes lower at longer wavelengths

Option a – It stays the same for all frequencies

Flute-Related Incorrect Statement. Identify the statement that is not correct regarding how a flute produces sound.

a) The loudness depends on the momentum of waves in the blowing jet

b) The pitch depends on the arrival time of waves in the blowing jet

c) Sound is produced by a vibrating column of air inside the flute

d) Sound is produced by a vibrating column of air inside and outside the flute

Option d – Sound is produced by a vibrating column of air inside and outside the flute

Echo Formation. Which condition results in an echo?

a) Reflection of sound waves

b) Sound traveling through a Solid

c) Sound traveling through a liquid

d) Sound moving through a vacuum

Option a – Reflection of sound waves

Fastest Speed of Sound at 25 °C. At 25 °C, in which material does sound travel the fastest?

a) Nickel

b) Steel

c) Iron

d) Aluminium

Option d – Aluminium

Incorrect Sound Statement. Which of these statements about sound is incorrect?

a) Sound can propagate through a vacuum

b) In humans, sound is produced by vibrating vocal cords

c) Unpleasant sounds are referred to as noise

d) Frequency is measured in hertz

Option a – Sound can propagate through a vacuum

Loudness–Amplitude Link. Loudness of a sound is proportional to which function of vibration amplitude?

a) Cube root

b) Cube

c) Square

d) Square root

Option c – Square

Study of Sound Waves. The branch of science dealing with the production and movement of sound waves is called:

a) Optics

b) Photonics

c) Acoustics

d) Astrophysics

Option c – Acoustics

Frequency from 10 Oscillations per Second. An object making 10 oscillations each second has what frequency in kilohertz?

a) 1

b) 0.01

c) 0.1

d) 10

Option b – 0.01

Source of Only Odd Harmonics. Which source produces only odd harmonics?

a) Air column in a closed organ pipe

b) Vibrating string fixed at both ends

c) Air column in an open organ pipe

d) Vibrating rod fixed at both ends

Option a – Air column in a closed organ pipe

Speed of Sound in Distilled Water. Approximate speed of sound in distilled water at 25 °C (77 °F) is:

a) 1498 m/s

b) 1284 m/s

c) 1598 m/s

d) 3980 m/s

Option a – 1498 m/s

Bats’ Navigation Waves. Bats locate prey in the dark using which type of sound waves?

a) Sonic waves

b) Hypersonic waves

c) Subsonic waves

d) Ultrasonic waves

Option d – Ultrasonic waves

Velocity of Sound in Air. What is the approximate speed of sound in air?

a) 220 m/s

b) 232 m/s

c) 110 m/s

d) 343 m/s

Option d – 343 m/s

Thunder vs. Lightning. Why is thunder heard after the flash of lightning?

a) Sound travels much slower than Light

b) Sound is three times faster than Light

c) Sound is twice as fast as Light

d) Sound and Light move at the same speed

Option a – Sound travels much slower than light

Accurate Wave Statement. Which of these statements about wave motion is correct?

a) Particles oscillating along the direction of wave travel form a transverse wave

b) The shortest distance between two points in the same phase is the wavelength

c) Particles oscillating perpendicular to wave direction form a longitudinal wave

d) Frequency equals the number of oscillations per minute of each particle

Option b – The shortest distance between two points in the same phase is the wavelength

Wave Speed in Water. The rate at which a wave moves through water, expressed in knots, is called:

a) Wave height

b) Wave crest and trough

c) Wave speed

d) Wave frequency

Option c – Wave speed

Frequency of 100 Oscillations in 5 s. If an object oscillates 100 times in 5 seconds, its frequency is:

a) 20 Hz

b) 200 Hz

c) 100 Hz

d) 50 Hz

Option a – 20 Hz

Time for Sound to Travel 1.5 km. How long does a sound wave take to cover 1.5 km if its frequency is 5 kHz and wavelength is 6 cm?

a) 50 seconds

b) 25 seconds

c) 2.5 seconds

d) 5 seconds

Option d – 5 seconds

Frequency for 0.04 s Period. A wave with a period of 0.04 seconds has a frequency of:

a) 50 Hz

b) 25 Hz

c) 40 Hz

d) 100 Hz

Option b – 25 Hz

Wave with Parallel Oscillation. Which wave oscillates parallel to its direction of propagation?

a) Electromagnetic wave

b) Transverse wave

c) Mechanical wave

d) Longitudinal wave

Option d – Longitudinal wave

Term for Oscillations per Second. The number of oscillations per second is termed:

a) Pitch

b) Hertz