Sound: MCQ Test (25 questions)

Question 1 of 25

What should be the time interval between the original sound and the echo to hear an echo?

Aequal to 1/10 second
Bless than 1/10-second
Cmore than 1/10-second
DNone of these.

Question 2 of 25

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 3 of 25

If the same note is played on sitar and flute, then the difference in the sound produced by them can be made due to the difference in the following:

Apitch, loudness and quality
Bpitch and loudness only
Csound loudness only
DSound quality only

Question 4 of 25

The velocity of sound in air is approximately-

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

Question 5 of 25

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

AAir
BGranite
CWater
DIron

Question 6 of 25

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

Areverberation
Bdeflection
CRefraction
DDiffraction

Question 7 of 25

What is used to clean the interiors of aircraft?

AUltrasonic wave
Boxalic acid
CInfrasonic wave
Dcarbon dioxide

Question 8 of 25

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 9 of 25

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

A224 feet
B56 feet
C28 feet
D100 feet

Question 10 of 25

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 11 of 25

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 12 of 25

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

AAir
BGranite
CWater
DIron

Question 13 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 14 of 25

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

Awavelength
BExpansion
Cfrequency
Dintensity

Question 15 of 25

Radio tuning station is an example of

Areflection
Bresonance
Creflection
DRefraction

Question 16 of 25

Which process does not occur in both light and sound?

ADiffraction
Breflection
Cpolarization
DRefraction

Question 17 of 25

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 18 of 25

On which principle of sound does the stethoscope work?

Areflection
BRefraction
CDiffraction
Dpolarization

Question 19 of 25

Which of the following causes the most noise pollution?

Amotor vehicle
BRailway Engine
CPop music
Dflying an airplane

Question 20 of 25

Sonar is mostly used in-

Aby astronauts
Bby doctors
Cby engineers
Dby navigators

Question 21 of 25

In which medium sound waves cannot travel?

Asolid medium
Bliquid medium
Cgaseous medium
Dvacuum

Question 22 of 25

A biological method that uses ultrasonic sound?

ASonography
BECG
CEEG.
DX-ray

Question 23 of 25

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 24 of 25

Sound travels fastest through which of the following substances?

AIn steel
Bin the air
Cin a vacuum
Din water

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