Sound Test

Result

Sound Test - 42

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Weekly Quiz Competition

Question 1
1 / -0

Which of these picture shows the way of sound vibrations travel

A

B

C

D

Solution

Sound waves travel in all directions after being produced by a source. The fourth figure depicts that the sound is travelling in all directions.
Hence, the correct figure is the fourth one.
Question 2
1 / -0

A vibrating particle displacement is zero in every 2 secs. The frequency of vibration is

A
5 Hz

B
0.5 Hz

C
20 Hz

D
2 Hz

Solution

The statement means the particle returns to its position every 2 secs.
Time period $$T= 2\ s$$
Frequency $$f=\dfrac{1}{T}= \dfrac{1}{2}= 0.5 Hz$$

The correct option is (b)
Question 3
1 / -0

Sound waves having the following frequency are audible to human beings:

A
$$5$$ cycles/sec

B
$$27000$$ cycles/sec

C
$$5000$$ cycles/sec

D
$$50,000$$ cycles/sec

Solution

Audible range of frequency is $$ 20 \mathrm{Hz} $$ to $$ 20 \mathrm{kHz} $$
So, the audible frequency will consist of 5000 cycles/sec.
Question 4
1 / -0

An astronaut can not hear his companion's sound at the surface of moon because:

A
produced frequencies are above the audio frequency

B
sound wave does not propagate through vaccum

C
temperature is too low during night and high during day

D
none of the above

Solution

As there is no atmosphere on the surface of moon so sound wave cannot travel through vacuum as they are mechanical wave and need medium to travel that's why an astronaut cannot hear his companion's sound at the surface of moon.
Question 5
1 / -0

A musical instrument is producing a continuous note. This note can not be heard by a person having a normal hearing range. This note must then be passing through:

A
water

B
wax

C
vacuum

D
empty vessel

Solution

Sound is a mechanical wave and it needs a medium for propagation.
The vacuum does not allow sound to propagate. Hence the note must be passing through vacuum.
Option (C) is correct.
Question 6
1 / -0

Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?

A
Stretched strings

B
Stretched membranes

C
Metal plates

D
Air columns

Solution

Metal plates vibrate when a musical note is produced by the cymbals in an orchestra.
Cymbal is a musical instrument that produces sound when being struck.
Question 7
1 / -0

The loudness of sound is determined by the

A
Amplitude of vibration

B
The ratio of amplitude and frequency of vibration

C
Frequency of vibration

D
Product of amplitude and frequency of vibration

Solution

Loudness is directly proportional to amplitude of sound waves.
Question 8
1 / -0

The audible range for a normal human being is :

A
$$ 10 $$ Hz to $$ 20, 000 $$ Hz

B
$$ 20 $$ Hz to $$ 20 $$ KHz

C
$$ 10 $$ Hz to $$ 50 $$ KHz

D
$$ 20 $$ Hz to $$ 1000 $$ Hz

Solution

The audible range for a normal human being is $$ 20 $$ Hz to $$ 20 $$ KHz
Question 9
1 / -0

We can hear sound of frequency

A
$$ 10 \,Hz $$

B
$$ 500 \,Hz $$

C
$$ 100,000\,Hz $$

D
$$ 50,000\,Hz $$

Solution

People can hear sounds at frequencies from about $$20\ Hz$$ to $$20,000\ Hz$$, though we hear sounds best from $$1,000\ Hz$$ to $$5,000\ Hz$$, where human speech is centered.

So, option B is correct as it is in the range from $$20\ Hz$$ to $$20,000Hz$$.
Question 10
1 / -0

The safe limit of loudness of audible sound is

A
0 to 80 db

B
above 80 db

C
120 db

D
above 120 db

Solution

The safe limit of loudness of audible sound is $$0 \, to \, 80 \, db$$

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Re-Attempt Weekly Quiz Competition

Sound Test - 42

Result

Sound Test - 42

Score

-

Rank

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SHARING IS CARING

Question 1

Solution

Question 2

5 Hz

0.5 Hz

20 Hz

2 Hz

Solution

Question 3

$$5$$ cycles/sec

$$27000$$ cycles/sec

$$5000$$ cycles/sec

$$50,000$$ cycles/sec

Solution

Question 4

produced frequencies are above the audio frequency

sound wave does not propagate through vaccum

temperature is too low during night and high during day

none of the above

Solution

Question 5

water

wax

vacuum

empty vessel

Solution

Question 6

Stretched strings

Stretched membranes

Metal plates

Air columns

Solution

Question 7

Amplitude of vibration

The ratio of amplitude and frequency of vibration

Frequency of vibration

Product of amplitude and frequency of vibration

Solution

Question 8

$$ 10 $$ Hz to $$ 20, 000 $$ Hz

$$ 20 $$ Hz to $$ 20 $$ KHz

$$ 10 $$ Hz to $$ 50 $$ KHz

$$ 20 $$ Hz to $$ 1000 $$ Hz

Solution

Question 9

$$ 10 \,Hz $$

$$ 500 \,Hz $$

$$ 100,000\,Hz $$

$$ 50,000\,Hz $$

Solution

Question 10

0 to 80 db

above 80 db

120 db

above 120 db

Solution

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