Sound: MCQ Test (50 questions)

Question 1 of 50

Which of the following properties of sound is affected by change in air temperature?

Awavelength
BExpansion
Cfrequency
Dintensity

Question 2 of 50

The fluctuations in the frequency of a sound source are called-

ARaman effect
BDoppler effect
CCrampton effect
Dphotoelectric effect

Question 3 of 50

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

Aradio waves
Bmicrowave
Cinfrared wave
DNone of these

Question 4 of 50

The ratio of the velocity of an object to the velocity of sound in the same medium and under the same conditions is called-

APlace number
BDurability Number
Coctane number
DMach number

Question 5 of 50

The walls, ceiling and floor of a good auditorium should be made of fibrous material, carpet, glass etc.

ABeautify the auditorium
BReducing the cost of construction
CFire safety in the auditorium
DAbsorbing sound to prevent echoes

Question 6 of 50

A jet aircraft is flying through the air at Mach 2. What is the speed of the aircraft when the speed of sound is 332 m/s?

A166m/s
B66.4m/s
C332m/s
D664m/s

Question 7 of 50

Velocity of sound in different mediums-

Ais the same
Bvaries and is highest in solids
CIt varies and is lowest in liquids.
Dvaries and is highest in gases

Question 8 of 50

Echo is produced due to the _______ of waves.

ARefraction
BAbsorption
Creflection
DDiffraction

Question 9 of 50

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 10 of 50

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 11 of 50

The velocity of sound in moist air is greater than that in dry air because in moist air-

Ahas a higher density than dry air
Bhas a lower density than dry air
CThe pressure is higher than that of dry air
DLower pressure than dry air

Question 12 of 50

When two loudspeakers are used simultaneously at a place, a listener sitting at a particular place cannot hear their sound. This is because:

Areflection
Binterference
CRefraction
Dresonance

Question 13 of 50

Radio tuning station is an example of

Areflection
Bresonance
Creflection
DRefraction

Question 14 of 50

In which medium sound waves cannot travel?

Asolid medium
Bliquid medium
Cgaseous medium
Dvacuum

Question 15 of 50

Ultrasonic waves are those sound waves whose frequency is-

Ais less than 20 Hz
Bis greater than 20 kHz.
CMore than 20,000 Hz
Dis between 20 Hz and 1000 Hz

Question 16 of 50

The working system of radar is based on the following principle-

ARefraction of radio waves
BReflection of radio waves
CDoppler effect
DRaman effect

Question 17 of 50

Which one of the following statements is not correct about sound?

Asound travels slower than the speed of light
BSound travels faster in humid air than in dry air
Csound waves are longitudinal waves
Dsound waves are longitudinal waves

Question 18 of 50

The velocity of sound in air is approximately-

A330m/s
B220m/s
C110m/s
D232m/s

Question 19 of 50

How long does the effect of sound last in the human ear?

A1/5 second
B1/10 second
C1/20 second
D1/2 second

Question 20 of 50

Sonar is mostly used in-

Aby astronauts
Bby doctors
Cby engineers
Dby navigators

Question 21 of 50

Who first produced ultrasonic waves by whistling?

ANewton
BGalton
CHertz
DFaraday

Question 22 of 50

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 23 of 50

In which medium will the speed of sound be maximum at a temperature of about 20°C?

AAir
BGranite
CWater
DIron

Question 24 of 50

Mach numbers are used in relation to velocity.

Aof sound
Bof the vessel
Cof the aircraft
Dof the spacecraft

Question 25 of 50

Ships enter silence zones, where the sound of sirens is inaudible. These silent zones are created by what property of sound waves?

Areflection
Binterference
CRefraction
Dresonance

Question 26 of 50

Which of the following statements is true for sound waves?

AAll the above statements are true
BIts speed at 0°C is 332 m/s
CIt can operate in vacuum.
DThese can be polarized

Question 27 of 50

The reverberation time of Dead Hall is-

A0.8 seconds
B0.8 seconds
C1.8 seconds
D8 seconds

Question 28 of 50

What phenomenon do bats or dolphins use to detect prey, predators, or obstacles?

ARefraction of sound
Bformation of beats
Cscattering of sound
DDetermination of resonance

Question 29 of 50

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 30 of 50

Which process does not occur in both light and sound?

ADiffraction
Breflection
Cpolarization
DRefraction

Question 31 of 50

The speed of sound in air is 332 meters per second. If the pressure is doubled, the speed of sound will be

A664m/s
B332m/s
C166m/s
D100m/s

Question 32 of 50

To hear a clear echo, the minimum distance between the reflecting surface and the sound source should be-

A10 meters
B17 meters
C24 meters
D30 meters

Question 33 of 50

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 34 of 50

The frequency or sharpness of the whistle of an approaching train increases, due to which phenomenon does this happen?

ABig Bang Theory
BDoppler effect
CArchimedes' law
DCharles's Law

Question 35 of 50

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 36 of 50

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 37 of 50

Which waves cannot propagate in vacuum?

ALight
Belectromagnetic
Csound
Dheat

Question 38 of 50

Velocity of sound in air-

Adecreases with increase in temperature
Bincreases with decreasing temperature
Cis not dependent on temperature
Ddecreases with decreasing temperature

Question 39 of 50

On which principle of sound does the stethoscope work?

Areflection
BRefraction
CDiffraction
Dpolarization

Question 40 of 50

Which of the following statements regarding the propagation of sound waves is not correct?

ASound waves can travel through water.
BSound waves can travel through air.
Csound waves can travel through steel
Dsound waves can travel through vacuum

Question 41 of 50

The property of sound waves which determines the pitch of the sound is the sound's/ki-

Afrequency
BDimensions
Cwavelength
Dintensity

Question 42 of 50

The instrument used to detect submerged objects is called-

Aradar
BSonar
CKyasar
DPulsator

Question 43 of 50

The standard sound level for humans is-

A90dB
B60dB
C120 dR
D100 aB

Question 44 of 50

On what does the pitch of sound depend?

Afrequency
Bintensity
CDimensions
Dvelocity

Question 45 of 50

Which of the following statements is correct? Velocity of sound-

ADoes not depend on the nature of the medium
BIt is maximum in gases and minimum in liquids
CIt is maximum in solids and minimum in liquids
DIt is maximum in solids and minimum in gases

Question 46 of 50

Why is the voice of a small child more pleasant than the voice of a young man?

AThe pitch of a child's voice is lower than that of a man's voice.
BThe pitch of a child's voice is higher than that of a man's voice
CThe child has more strength
Dnone of the above

Question 47 of 50

Ultrasonic waves by humans-

Acan be heard
Bcannot be heard
Ccan sometimes be heard
Dnone of these

Question 48 of 50

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

Areverberation
Bdeflection
CRefraction
DDiffraction

Question 49 of 50

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

Aυ=λν
Bυ=λν2
Cυ=λ/ν
Dυ=ν/λ

Question 50 of 50

The relationship between the reverberation time and the volume of the hall has been formulated by-

AThe dollar
BNewton
CMavin
DLaplace