Sound Test

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Sound Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following sound is NOT a cause of noise pollution?

A
loud speaker

B
horn of vehicle

C
explosion

D
television

Solution

Television has the lowest volume , out of the given , and it also doesn't disturb other people therefore generally it is not a cause of noise pollution. Where other causes are generally very loud so they are the causes of noise pollution.
Question 2
1 / -0

$$Hertz$$ stands for:

A
$$second$$

B
$$second^{-1}$$

C
$$meter$$

D
$$meter^{1}$$

Solution

Hertz is the unit of frequency and frequency is defined as number of vibrations per second ,
$$f=$$number of vibrations/ time (in second) ,

Hence unit of frequency is,

$$second^{-1}=Hertz$$
Question 3
1 / -0

In humans, the sound is produced by:

A
larynx

B
wind pipe

C
vocal cords

D
lungs

Solution

$$\textbf{Correct option: Option (A).}$$

$$\textbf{Explanation:}$$

In humans, the sound is produced by larynx. It is located in our throat. It has two vocal cords stretched across it leaving a narrow slit. When the air passes through it, the cords vibrate to produce sound.

$$\textbf{Thus, option (A) is correct.}$$
Question 4
1 / -0

The velocity of sound in vacuum is:

A
$$332 ms^{-1}$$

B
$$330 ms^{-1}$$

C
$$288 ms^{-1}$$

D
0

Solution

We know that mechanical wave requires medium to travel. Sound is also a mechanical wave and vacuum means absence of medium therefore sound cannot travel in vacuum i.e. velocity of sound in vacuum is zero .
Question 5
1 / -0

Time taken to complete 6 successive compressions if the time between two successive compressions of a wave is 4 sec is :

A
20 s

B
50 s

C
70 s

D
15 s

Solution

The time period of a longitudinal wave is defined as the time between two successive compressions or rarefactions.
As given the time between two successive compressions is 4s,
therefore time period of the wave will be $$T=4 \ s $$.
The time between 6 successive compressions will be equal to 5 time periods,
i.e. $$=5\times4=20s$$
Question 6
1 / -0

An object attached to one end of a spring makes 20 vibrations in 10s. Its frequency is

A
2Hz

B
10s

C
0.05Hz

D
2s

Solution

Answer is A.

The frequency (f) of a wave is the number of full wave forms generated per second. This is the same as the number of repetitions per second or the number of oscillations per second.
In this case, an object attached to one end of a spring makes 20 vibrations in 10 s. That is, 20 vibration in 10 seconds. S in one second it makes 2 vibrations.
Therefore, the frequency of the object is 2 Hertz.
Question 7
1 / -0

Fill in the blank.
The time taken by ___ oscillation to complete is called time period.

A
One

B
Two

C
Three

D
Four

Solution

Time period can be defined as time to complete one full oscillation. Hence A is the correct answer.
Question 8
1 / -0

Trees must be removed from the road sides and around buildings to reduce the harmful effects of noise pollution.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

Trees absorb and block noise and reduce glare. A well-placed tree can reduce noise by as much as 40 percent.
Vegetation reduces noise pollution through a phenomenon called sound attenuation, which is the reduction of sound intensity. Leaves, twigs, and branches on trees, shrubs, and herbaceous growth absorb and deflect sound energy.
Question 9
1 / -0

The number of cycles an oscillator completes in each second is called its _______________.

A
Frequency

B
Velocity

C
Amplitude

D
Angular velocity

Solution

The number of cycles an oscillator completes in each second is called its frequency.
The frequency (f) of a wave is the number of full wave forms generated per second. This is the same as the number of repetitions per second or the number of oscillations per second.
Question 10
1 / -0

A person is listening to a tone 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 - $$ n=500Hz$$ ,
the time interval between two successive compressions or rarefactions is called , time period of wave , which is given by ,
$$T=1/n=1/500=0.002s=2millisecond$$

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Re-Attempt Weekly Quiz Competition

Sound Test - 13

Result

Sound Test - 13

Score

-

Rank

-

SHARING IS CARING

Question 1

loud speaker

horn of vehicle

explosion

television

Solution

Question 2

$$second$$

$$second^{-1}$$

$$meter$$

$$meter^{1}$$

Solution

Question 3

larynx

wind pipe

vocal cords

lungs

Solution

Question 4

$$332 ms^{-1}$$

$$330 ms^{-1}$$

$$288 ms^{-1}$$

0

Solution

Question 5

20 s

50 s

70 s

15 s

Solution

Question 6

2Hz

10s

0.05Hz

2s

Solution

Question 7

One

Two

Three

Four

Solution

Question 8

True

False

Ambiguous

Data insufficient

Solution

Question 9

Frequency

Velocity

Amplitude

Angular velocity

Solution

Question 10

5 milli second

1 milli second

2 milli second

2 second

Solution

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