Sound Test

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Sound Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

The part of the violin which vibrates while playing it is :

A
The wire

B
The box of the violin

C
Both the wire and the box

D
None of the above

Solution

Drawing the bow causes the string to vibrate. These vibrations are transferred to the bridge, the front, the soundpost, and the back of the violin. The air inside the hollow body of a violin vibrates at the same frequency.
Question 2
1 / -0

A sound wave completes $$20$$ vibrations in $$2.5\;s$$. Its frequency will be equal to :

A
$$20\;Hz$$

B
$$8\;Hz$$

C
$$200\;Hz$$

D
$$50\;Hz$$

Solution

We have,

$$Frequency=\frac{Number\,of\,vibration}{Time\,taken}$$

It is given that the sound wave completes 20 vibrations in 2.5 seconds

Hence,

$$Frequency=\frac{20}{2.5}=8\,Hz$$
Question 3
1 / -0

A body produces sound only if it is :

A
made of steel

B
made of glass

C
plucked

D
vibrating

Solution

Sound is produced by the vibration of any object in a medium. If the vibration is enough for humans to percieve and the vibration is done within a medium around, it will produce sound. If the vibrating body are in space, they will not produce sound because there is no medium present.
Question 4
1 / -0

Which of the following figures represents a loud sound of low pitch ?
Where y = displacement (m), t = time (s)

A

B

C

D
Question 5
1 / -0

There is no atmosphere on moon. Therefore,

A
no sound can be heard

B
sound can be easily heard

C
sound is sometimes heard

D
all the above statements are correct

Solution

Since sound waves are longitudinal in nature, so it requires a material medium to propagate. As there is no atmosphere on moon, so sound wave cannot propagate on moon. Thus, sound cannot be heard on moon.
Question 6
1 / -0

Consider the following sounds: G -conversation between two girls, P-sound produced by a peacock and M-sound produced by a moving motorcycle. These sounds in the increasing order of frequency are

A
G, P, M

B
P, M, G

C
P, G, M

D
M, G, P

Solution

The Pitch of sound depends on the frequency. We know that the sound produced by a motorcycle has the lowest pitch and the sound produced by a peacock has the highest pitch.
Thus the arrangement in the increasing order of frequency is -
$$\text{Motor Cycle}<\text{Conversation between two girls}<\text{Peacock}$$
$$\therefore M, G, P$$
Question 7
1 / -0

A person is listening to a tone of $$500 \ Hz$$ sitting at a distance of $$450 \ m$$ from the source of the sound. What is the time interval between the successive compression from the source?

A
$$5 \ ms$$

B
$$1 \ ms$$

C
$$2 \ ms$$

D
$$2 \ s$$

Solution

Given - $$ n=500 \ Hz$$ ,

The time interval between two successive compressions or rarefactions is called , time period of wave , which is given by ,

$$T=\dfrac 1n= \dfrac{1}{500}= 0.002 \ s=2 \ ms$$
Question 8
1 / -0

A person is listening to a tone of $$500$$ Hz sitting at a distance of $$450$$ m from the source of the sound. What is the time interval between the successive compression from the source ?

A
$$5$$ milli second

B
$$1$$ milli second

C
$$2$$ milli second

D
$$2$$ second

Solution

Given - $$ f=500Hz$$ ,
The time interval between two successive compressions or rarefactions is the time period of the wave , which is given by ,
$$T=1/f=1/500=0.002s=2\ milli\ second$$
Question 9
1 / -0

The product of the time period of a sound wave and its frequency is equal to:

A
infinite

B
zero

C
more than unity but less than infinity

D
unity

Solution

We have the equation,

$$f=\frac{1}{T}$$

where,

$$f$$ is the frequency

$$T$$ is the time period

Hence the product of the time period of the sound wave and its frequency is equal to unity.
Question 10
1 / -0

The frequency of a wave is 5 Hz. It refers to (type of wave) ___________.

A
ultrasonics

B
microwaves

C
infrasonics

D
radio waves

Solution

The waves below the frequency of 20 Hz are infrasonic waves. So, the wave of 5 Hz is also an infrasonic wave.

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Re-Attempt Weekly Quiz Competition

Sound Test - 33

Result

Sound Test - 33

Score

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Rank

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SHARING IS CARING

Question 1

The wire

The box of the violin

Both the wire and the box

None of the above

Solution

Question 2

$$20\;Hz$$

$$8\;Hz$$

$$200\;Hz$$

$$50\;Hz$$

Solution

Question 3

made of steel

made of glass

plucked

vibrating

Solution

Question 4

Question 5

no sound can be heard

sound can be easily heard

sound is sometimes heard

all the above statements are correct

Solution

Question 6

G, P, M

P, M, G

P, G, M

M, G, P

Solution

Question 7

$$5 \ ms$$

$$1 \ ms$$

$$2 \ ms$$

$$2 \ s$$

Solution

Question 8

$$5$$ milli second

$$1$$ milli second

$$2$$ milli second

$$2$$ second

Solution

Question 9

infinite

zero

more than unity but less than infinity

unity

Solution

Question 10

ultrasonics

microwaves

infrasonics

radio waves

Solution

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