Sound: MCQ Test (50 questions)

Question 1 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 2 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 3 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 4 of 50

Mach numbers are used in relation to velocity.

Aof sound
Bof the vessel
Cof the aircraft
Dof the spacecraft

Question 5 of 50

The nature of sound waves is-

Atransverse
Blongitudinal
Celectromagnetic
Dnon-progressive

Question 6 of 50

Supersonic aircraft fly in-

Aat the speed of sound
Bat a speed less than the speed of sound
Cfaster than the speed of sound
Dat the speed of light

Question 7 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 8 of 50

Sound travels fastest through which of the following substances?

AIn steel
Bin the air
Cin a vacuum
Din water

Question 9 of 50

The instrument used to detect submerged objects is called-

Aradar
BSonar
CKyasar
DPulsator

Question 10 of 50

A biological method that uses ultrasonic sound?

ASonography
BECG
CEEG.
DX-ray

Question 11 of 50

If Va, Vw and Vs are the velocity of sound in air, water and steel respectively, then-

AVa < Vw < Vs.
BVs < Vw < Va
CVw < Vs < Va
DVs < Vw < Va

Question 12 of 50

How far should a person stand from the reflecting surface to hear his echo?

A224 feet
B56 feet
C28 feet
D100 feet

Question 13 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 14 of 50

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 15 of 50

What causes sound waves to produce echoes?

ARefraction
BDiffraction
Creflection
DNone of these

Question 16 of 50

Radio tuning station is an example of

Areflection
Bresonance
Creflection
DRefraction

Question 17 of 50

In which medium does sound travel fastest?

ASolid
Bfluid
Cgas
DAir

Question 18 of 50

Ultrasonic waves compared to audible sound waves-

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

Question 19 of 50

When the army crosses a bridge, the soldiers are instructed not to march in step because-

AThere is a risk of the bridge collapsing due to increased pressure.
BThere is a danger of the bridge breaking due to resonance of the sound produced by the feet
CThere is a danger of bridge collapse due to Dander effect.
Dnone of these

Question 20 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 21 of 50

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

Afrequency
BDimensions
Cwavelength
Dintensity

Question 22 of 50

While shouting, a person always keeps his palm near his mouth because-

AIn that case the sound energy will be pointing in only one direction.
BSound fullness of sound increases
CThe fluctuations in the sound tone increase.
DThis action has no effect on the sound.

Question 23 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 24 of 50

On which principle of sound does the stethoscope work?

Areflection
BRefraction
CDiffraction
Dpolarization

Question 25 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 26 of 50

Used to drive away insects and harmful elements from homes

Aultrasonic wave
Bradio waves
Cinfrared wave
DSubsonic wave

Question 27 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 28 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 29 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 30 of 50

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

Awavelength
BExpansion
Cfrequency
Dintensity

Question 31 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 32 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 33 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 34 of 50

When we place a pitcher under water to fill it, we hear a distinctive sound as it fills. This is because:

ARefraction
Binterference
Cresonance
Dreflection

Question 35 of 50

Which one of the following statements is not correct?

AThe velocity of sound in air increases with increase in temperature
BThe velocity of sound in air does not depend on pressure.
CThe velocity of sound in air decreases with increase in humidity.
DThe velocity of sound in air is not affected by changes in amplitude and frequency.

Question 36 of 50

The whistle of an approaching train increases in volume, while that of a departing train decreases. This phenomenon is an example of:

ARaman effect
BJoule Thomson effect
CCrompton effect
Dof the Doppler effect

Question 37 of 50

Noise or noise pollution is measured by-

Ain phone
Bin Desi
Cin decibels
Din decimals

Question 38 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 39 of 50

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 40 of 50

The maximum limit of sound intensity in decibels above which a person cannot hear is-

A50dB
B70 dB
C85 dB.
D95 dB

Question 41 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 42 of 50

What is used to clean the interiors of aircraft?

AUltrasonic wave
Boxalic acid
CInfrasonic wave
Dcarbon dioxide

Question 43 of 50

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

Apolarization
BDiffraction
Creflection
DRefraction

Question 44 of 50

Bats can fly in the dark because-

AHe can see clearly in the dark
BThe pupil of his eye is very large.
CThey produce very intense sound waves that control it.
DAny bird can do this.

Question 45 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 46 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 47 of 50

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

AAir
BGranite
CWater
DIron

Question 48 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 49 of 50

The reason for resonance is-

Areflection of sound
BRefraction of sound
CAbsorption of sound
Dspeed of sound

Question 50 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