Sound: MCQ Test (25 questions)

Question 1 of 25

What is the phenomenon called when sound created in a large hall persists due to repeated reflections?

Areverberation
Bdeflection
CRefraction
DDiffraction

Question 2 of 25

Which one of the following types of waves is used in night vision devices?

Aradio waves
Bmicrowave
Cinfrared wave
DNone of these

Question 3 of 25

What causes sound waves to produce echoes?

ARefraction
BDiffraction
Creflection
DNone of these

Question 4 of 25

Which of the following cannot be the unit of frequency of a sound wave?

AdB
Bs-1
CHz
Dmin-¹

Question 5 of 25

Explosions on the Moon are not heard far from the surface.

ADue to the absence of atmosphere
BDue to the absence of atmosphere
CDue to the low intensity of sound waves
Dnone of the above

Question 6 of 25

An astronaut cannot hear his classmate on the surface of the moon because-

AThe frequency produced is higher than the sound frequency
BThe temperature is very low at night and very high during the day.
Cis not a medium for propagating sound
DThere are many craters on the surface of the Moon.

Question 7 of 25

Which one of the following is not produced by sound waves in air?

Apolarization
BDiffraction
Creflection
DRefraction

Question 8 of 25

We listen to programs from different stations by turning the radio knob. This is possible through:

Adue to resonance
Bdue to beat
Cdue to interference
DCauses of diffraction

Question 9 of 25

Beats is a phenomenon that occurs when the frequencies of two harmonic waves are-

Abe equal
Bthere is a considerable difference in
Cbe multiples of each other
Dbe approximately the same

Question 10 of 25

Radio tuning station is an example of

Areflection
Bresonance
Creflection
DRefraction

Question 11 of 25

The frequency of infrasonic waves is-

ALess than 20 Hz
BMore than 20 Hz
CMore than 20,000Hz
D20 Hz to 20,000 Hz

Question 12 of 25

What is the approximate speed of boiling in distilled water at 25°C (77°F)?

A1284 m/s
B3980 m/s
C1598 m/s
D1498 m/s.

Question 13 of 25

Echo is produced due to the _______ of waves.

ARefraction
BAbsorption
Creflection
DDiffraction

Question 14 of 25

Which one of the following statements is not correct?

ASound waves in gases are longitudinal in nature.
BSound waves with a frequency less than 20 Hz are called ultrasonic waves.
CSound waves with higher amplitudes are louder
DSound waves with high audible frequencies are sharp.

Question 15 of 25

Who first produced ultrasonic waves by whistling?

ANewton
BGalton
CHertz
DFaraday

Question 16 of 25

The voice of women is thinner than that of men because the voice of women-

Ahas a higher frequency
Bhas a greater wavelength.
Chas a greater amplitude
Dhas a greater velocity

Question 17 of 25

What is the relation between frequency v, wavelength λ and speed of sound?

Aυ=λν
Bυ=λν2
Cυ=λ/ν
Dυ=ν/λ

Question 18 of 25

When we sit inside a room, we may not see the people talking in the adjacent room, but we can certainly hear their voices. This is because of sound—

Areflection
BRefraction
Cinterference
DDiffraction

Question 19 of 25

What is used to clean the interiors of aircraft?

AUltrasonic wave
Boxalic acid
CInfrasonic wave
Dcarbon dioxide

Question 20 of 25

Assertion (A): The steam emitted from a train engine is visible first, and the whistle is heard later. Reason (R): The speed of sound waves is much lower than that of light waves.

ABoth A and R are correct and R is the correct explanation of A
BBoth A and R are correct, but R is not the correct explanation of A
CA is correct, but R is incorrect
DA is wrong, but R is correct

Question 21 of 25

The instrument used to detect submerged objects is called-

Aradar
BSonar
CKyasar
DPulsator

Question 22 of 25

On hearing thunder, a person opens his mouth so that-

Acan dispel fear
BTo equalize the air pressure on the eardrums of both ears
CTo equalize the air pressure on the eardrums of both ears
Dto expel air through the mouth

Question 23 of 25

The sound of thunder is heard long after the lightning strikes. This is because:

Aclouds block sound waves
BThunder comes later,
Clight can travel in a vacuum but sound cannot
Dthe speed of light is much greater than the speed of sound

Question 24 of 25

Women's voice is sharper than men's because women's voice has-

AThe amplitude is reduced
BThe amplitude is higher
CThe pitch is low,
Dthe pitch is higher

Question 25 of 25

Ultrasonic waves compared to audible sound waves-

Ahave higher speeds
Bhave higher frequency
Chave longer wavelengths
Dhave both higher speed and higher frequency