Sound Test

Result

Sound Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following measure can be taken to control noise pollution in our surroundings?

A
By using silencers in vehicles

B
Planting trees

C
Using noise mufflers

D
All

Solution

Noise pollution can be reduced by using silencers in vehicles, industrial machines, and home appliances reducing the use of vehicle horns, running TV, radio, and music systems at low volumes. Planting trees along roads and buildings also help to reduce noise pollution.
Question 2
1 / -0

Noise pollution can be harmful to human beings because:

A
it can cause hearing loss

B
it can cause sleeplessness

C
can cause hypertension

D
all

Solution

Noise pollution can lead to a number of health-related problems. Some of them are as follows:
(i) Hearing loss
(ii)inability to sleep
(iii) Hypertension
(iv) Severe headache
(v) Stress
Question 3
1 / -0

When we hit a thin plastic ruler firmly on a bench:

A
the free end of the ruler vibrates and produces sound

B
the end held by hand vibrates and produces sound

C
even after it stops vibrating it continues to produce sound

D
none of the above occur

Solution

When we hit a plastic ruler on a table, due to the vibration of the ruler particles, the free end vibrates up and down and produces sound. Sound will not be produced when the vibration stops.
Question 4
1 / -0

Loud sound can travel a __________ distance as it is associated with_________ energy.

A
Larger, higher

B
Smaller, lower

C
Smaller, higher

D
All can be true according to the conditions.

Solution

Loud sound can travel a larger distance as it is associated with higher energy. A sound wave spreads out from its source. As it moves away from the source, its amplitude as well as its loudness decreases.
Question 5
1 / -0

What is the frequency of a vibrating body whose time-period is 0.05 second?

A
10 Hz

B
20 Hz

C
40 Hz

D
none

Solution

Frequency $$f$$ and time period $$t$$ are reciprocal of each other.
$$f = \dfrac{1}{t} = \dfrac{1}{0.05} = \dfrac{100}{5} = 20 Hz$$
Question 6
1 / -0

In the bell jar experiment, after starting the vacuum pump the sound gradually become fainter and finally we hear a feeble sound. Why?

A
The Vacuum pump absorbs the sound

B
The medium is sucked by the pump

C
The bell jar behaves as isolated medium

D
The bell do not produce such strong sound as it was producing earlier.

Solution

Sound needs a medium to travel. The vacuum pump pumps out the air, and thus the medium through which the sound travels is pumped out and so the sounds get fainter.
Question 7
1 / -0

The loudness or softness of a sound is determined basically by ________.

A
frequency

B
pitch

C
amplitude

D
phase

Solution

Loudness or softness of a sound is determined basically by its amplitude. The amplitude of the sound wave depends upon the force with which an object is made to vibrate. If we strike a table lightly, we hear a soft sound because we produce a sound wave of less energy (amplitude). If we hit the table hard we hear a loud sound.Loud sound can travel a larger distance as it is associated with higher energy.
Question 8
1 / -0

How does sound is produced by humans?

A
In humans sound is produced by the voice box.

B
In humans sound is produced by the larynx.

C
In humans sound is produced by the upper part of the wind pipe.

D
All

Solution

$$\bullet$$In humans sound is produced by the voice box or larynx. It is the upper part of the windpipe.
$$\bullet$$Two vocal cords are stretched across the voice box leaving a narrow slit. When the lungs force air through the slit, it vibrates and produces sound.
Question 9
1 / -0

If a vibrator strikes the water $$50$$ times in $$5s$$, then the frequency of wave is

A
$$10 Hz$$

B
$$0.5 Hz$$

C
$$5 Hz$$

D
$$0.1 Hz$$

Solution

Total number of vibrations, in $$5s$$ is $$50$$.
So, number of vibrations in $$1s$$ is $$\dfrac{50}{5}=10$$
Frequency$$=10Hz$$, (As frequency is defined as the number of oscillations or vibrations per second)
Question 10
1 / -0

A source of wave produces $$1$$ crest and $$1$$ trough in $$16\ s.$$ Find the frequency of the wave.

A
$$0.0625\ Hz$$

B
$$16\ Hz$$

C
$$100\ Hz$$

D
$$10\ Hz$$

Solution

A source of wave produce $$1$$ crest and $$1$$ trough in $$16\ s$$.
$$\implies \text{Time period},\ T=16\ s$$
We know,
Frequency, $$f=\dfrac 1T$$

$$f=\dfrac {1}{16}$$

$$f=0.0625\ Hz$$

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Re-Attempt Weekly Quiz Competition

Sound Test - 37

Result

Sound Test - 37

Score

-

Rank

-

SHARING IS CARING

Question 1

By using silencers in vehicles

Planting trees

Using noise mufflers

All

Solution

Question 2

it can cause hearing loss

it can cause sleeplessness

can cause hypertension

all

Solution

Question 3

the free end of the ruler vibrates and produces sound

the end held by hand vibrates and produces sound

even after it stops vibrating it continues to produce sound

none of the above occur

Solution

Question 4

Larger, higher

Smaller, lower

Smaller, higher

All can be true according to the conditions.

Solution

Question 5

10 Hz

20 Hz

40 Hz

none

Solution

Question 6

The Vacuum pump absorbs the sound

The medium is sucked by the pump

The bell jar behaves as isolated medium

The bell do not produce such strong sound as it was producing earlier.

Solution

Question 7

frequency

pitch

amplitude

phase

Solution

Question 8

In humans sound is produced by the voice box.

In humans sound is produced by the larynx.

In humans sound is produced by the upper part of the wind pipe.

All

Solution

Question 9

$$10 Hz$$

$$0.5 Hz$$

$$5 Hz$$

$$0.1 Hz$$

Solution

Question 10

$$0.0625\ Hz$$

$$16\ Hz$$

$$100\ Hz$$

$$10\ Hz$$

Solution

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