Sound: MCQ Test (25 questions)

Question 1 of 25

Echo sounding is used in-

Ato produce vibrations in sound
Bto increase the frequency of sound
Cto measure the depth of the sea
Dnone of the above

Question 2 of 25

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 3 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 4 of 25

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 5 of 25

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

Afrequency
BDimensions
Cwavelength
Dintensity

Question 6 of 25

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

AAir
BGranite
CWater
DIron

Question 7 of 25

Radio tuning station is an example of

Areflection
Bresonance
Creflection
DRefraction

Question 8 of 25

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 9 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 10 of 25

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

ARaman effect
BDoppler effect
CCrampton effect
Dphotoelectric effect

Question 11 of 25

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

Afrequency
BDimensions
Cwavelength
Dintensity

Question 12 of 25

Which of the following causes the most noise pollution?

Amotor vehicle
BRailway Engine
CPop music
Dflying an airplane

Question 13 of 25

What is used to clean the interiors of aircraft?

AUltrasonic wave
Boxalic acid
CInfrasonic wave
Dcarbon dioxide

Question 14 of 25

Due to which characteristic of sound a sound becomes thick or thin?

Aintensity
Bpitch
Cquality
DNone of these

Question 15 of 25

The nature of sound waves is-

Atransverse
Blongitudinal
Celectromagnetic
Dnon-progressive

Question 16 of 25

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 17 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 18 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 19 of 25

What is the instrument called which is used for identification and alignment of sound waves?

Aradar
BSonar
CPucker
DNone of these

Question 20 of 25

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 21 of 25

It is said that when Tansen sang, window panes or glass glasses would shatter into pieces. If this were even possible, what property of sound would cause it?

Areflection
BRefraction
Cresonance
Dinterference

Question 22 of 25

Decibel is used to measure which of the following?

Aspeed of light
Bintensity of sound
Cfrequency of radio waves
Dheat intensity

Question 23 of 25

Noise or noise pollution is measured by-

Ain phone
Bin Desi
Cin decibels
Din decimals

Question 24 of 25

On which principle of sound does the stethoscope work?

Areflection
BRefraction
CDiffraction
Dpolarization

Question 25 of 25

The standard sound level for humans is-

A90dB
B60dB
C120 dR
D100 aB