Sound Test

Result

Sound Test - 73

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Weekly Quiz Competition

Question 1
1 / -0

A gun is fired and the echo is heard after $$2.5\ s$$. The distance of the gun from the cliff is if the velocity of sound in air is $$332\ ms^{-1}$$.

A
$$415m$$

B
$$830m$$

C
$$420m$$

D
$$840m$$

Solution

Suppose reflecting surface is at $$x$$ distance from shooter.
For echo, sound must travel $$2x$$.
$$t = 2.5\ s$$; time for echo after fire
$$v = 332\ ms^{-1}$$; speed of the sound
So,
$$v = \dfrac{2x}{t}$$

$$\Rightarrow x = \dfrac{vt}{2}$$

$$\Rightarrow x = \dfrac{332 \times 2.5}{2}$$

$$\Rightarrow x = 415\ m$$
Question 2
1 / -0

It is possible to recognise a person by hearing his voice even if he is hidden behind a wall. This is due to the fact that his voice

A
Has a definite pitch

B
Has a definite quality

C
Has a definite loudness

D
Can penetrate the wall

Solution

The waveforms produced by different persons are different. Even if the pitch and loudness of two waves produced by two different persons are the same, their quality will be different.
Question 3
1 / -0

Objects that have hard-to-reach places for cleaning are placed in _________ and ultrasound waves are sent there.

A
cleaning solution

B
salt solution

C
acid solution

D
basic solution

Solution

Ultrasound is used to clean parts located in hard-to-reach places (i.e.) spiral tube, odd shaped parks, electronic components etc. Objects to be cleaned are placed in a cleaning solutions and ultrasonic waves are sent into the solutions.This helps in cleaning microscopic dirt and dust of the objects.
Question 4
1 / -0

Th eardrum sends the vibrations to the _______?

A
Brain

B
Outer ear

C
Nerve Cell

D
Middle ear

Solution

The middle ear is right after the eardrum. So, the eardrum sends vibrations to the middle ear.
Hence the option $$D$$ is correct.
Question 5
1 / -0

Which of these correctly represents the definition of frequency?

A
The number of oscillations per second

B
The number of oscillations per minute

C
The number of oscillations per hour

D
The number of oscillations per day

Solution

The number of oscillations per second is called the frequency of oscillation.
Question 6
1 / -0

Which of these is not a function of the ear drum?

A
Send vibrations to the inner ear

B
Comprehend the vibrations of any sound

C
Vibrate when sound enters

D
None of these

Solution

Sound vibrations make the eardrum vibrates and it also sends vibrations to the inner ear, however, the brain comprehends the signals hence option $$B$$ is correct.
Question 7
1 / -0

Which of the following is not a property of ultrasound that makes it useful in medicine?

A
High frequency

B
Ability to travel along path even with obstacles

C
The waves are transverse

D
None of these

Solution

Ultrasounds are high frequency waves and are able to travel along welldefined paths even in the presence of obstacles, therefore, they are used extensively in industries and for medical purposes, hence option $$C$$ is correct.
Question 8
1 / -0

Frequency is expressed in?

A
Seconds (s)

B
Kelvin (K)

C
Hertz (Hz)

D
Metre (m)

Solution

Frequency is expressed in
hertz (Hz), hence option $$C$$ is correct.
Question 9
1 / -0

Which of the following correctly describes a wave?

A
It is a medium

B
It is a disturbance

C
It is a motion

D
None of these

Solution

A wave is a disturbance that moves through a medium when the particles of the medium set neighbouring particles into motion.
Hence, option $$B$$ is correct.
Question 10
1 / -0

Sound waves are also called?

A
Longitudinal waves

B
Transverse waves

C
Mechanical waves

D
Microwaves

Solution

Sound waves are characterized by the motion of particles in the medium and are called mechanical waves, hence option $$C$$ is correct.

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Re-Attempt Weekly Quiz Competition

Sound Test - 73

Result

Sound Test - 73

Score

-

Rank

-

SHARING IS CARING

Question 1

$$415m$$

$$830m$$

$$420m$$

$$840m$$

Solution

Question 2

Has a definite pitch

Has a definite quality

Has a definite loudness

Can penetrate the wall

Solution

Question 3

cleaning solution

salt solution

acid solution

basic solution

Solution

Question 4

Brain

Outer ear

Nerve Cell

Middle ear

Solution

Question 5

The number of oscillations per second

The number of oscillations per minute

The number of oscillations per hour

The number of oscillations per day

Solution

Question 6

Send vibrations to the inner ear

Comprehend the vibrations of any sound

Vibrate when sound enters

None of these

Solution

Question 7

High frequency

Ability to travel along path even with obstacles

The waves are transverse

None of these

Solution

Question 8

Seconds (s)

Kelvin (K)

Hertz (Hz)

Metre (m)

Solution

Question 9

It is a medium

It is a disturbance

It is a motion

None of these

Solution

Question 10

Longitudinal waves

Transverse waves

Mechanical waves

Microwaves

Solution

User

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