Sound Test

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Sound Test - 41

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Weekly Quiz Competition

Question 1
1 / -0

An empty vessel produces louder sound than a filled one because.

A
The liquid in the filled vessel absorbs the vibrations of the liquid molecules

B
The air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel

C
The density of air is less than the density of liquid contained in the vessel when filled

D
The kinetic energy of particles constituting the air column is greater as compared to the kinetic energy of particles of liquid column

Solution

An empty vessel produces louder sound than a filled one because the air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel
Question 2
1 / -0

The tip of a pencil attached to a spring oscillates vertically, thereby etching an overlapping straight line on a white sheet of paper. The length of this line is $5 \ cm$ . What is the amplitude of the vibration

A
$5 \ cm$

B
$10 \ cm$

C
$2.5 \ cm$

D
Cannot be found

Solution

The line length gives the distance between two extremes = twice the amplitude of the vibration. Thus, amplitude of vibration $$= \dfrac{5}{2} = 2.5 \ cm$$

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

The maximum displacement of a particle in a vibratory motion is known as

A
Time period

B
Wavelength

C
Amplitude

D
frequency

Solution

As seen in above figure the maximum displacement of a particle from it's mean position in a vibratory motion is known as amplitude.

The correct option is (c)
Question 4
1 / -0

A particle completes one vibration in 2 secs. How long does it take to vibrate 25 vibrations

A
25 sec

B
10 sec

C
5 sec

D
50 sec

Solution

For completing one vibration, time taken = $2\ S$
Total time taken to complete 25 vibration $= 2 \times 25 = 50 sec$

The correct option is (d)
Question 5
1 / -0

A particle performs $20$ vibrations in $5\ s$ . The time period of vibration is:

A
$2.5\ s$

B
$0.1\ s$

C
$0.25\ s$

D
$4\ s$

Solution

Given,
Number of vibrations $=20$
Time taken to complete $20$ vibrations $=5\ s$
Time taken to complete $1$ vibration is known as time period $T$ .
Time taken to complete $1$ vibration, $T=\dfrac{5}{20}$
$T=0.25\ s$
Question 6
1 / -0

A sound wave has a speed of 200 m/s in a medium and it travels a distance of 1 m. What is the time taken by the wave to cross the medium

A
50 ms

B
100 ms

C
10 ms

D
5 ms

Solution

We know that wave velocity = distance/Time taken
$200= 1/t \implies t = 1/200 = 0.005 s$

The correct option is (d)
Question 7
1 / -0

A particle takes 0.01 s to complete 5 vibrations, what is its frequency

A
5 Hz

B
10 Hz

C
50 Hz

D
500 Hz

Solution

Given:
Number of vibration = $5$
Time $t=0.01\ s$
Frequency= $\dfrac{\text{Number of vibration}}{\text{Time}}=\dfrac{5}{0.01} = 500 Hz$

The correct option is (d)
Question 8
1 / -0

The period of a source of a sound wave whose frequency is $400 Hz$

A
$2.5\ s$

B
$2.5\ ms$

C
$2.5\ \mu s$

D
$25\ s$

Solution

Given the frequency of the wave is $f = 400\ Hz$

We know that time period is
$T = \dfrac{1}{f}$

$T = \dfrac{1}{400} \, = \, 2.5 \times 10^{-3} = 2.5\ ms$

So B is the correct answer.
Question 9
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Directions For Questions

Ultrasonic and Infrasonic Waves: The sound having frequency between $20$ Hz to $20$ kHz is called audible sound. Human ear cannot hear sound of frequencies lying outside this range. The limits of audibility of sound vary from individual. Generally the upper limit decreases with increase of age of individual; usually and people can not hear sound of frequency more than $15$ kHz.
Sound of frequencies below $20$ Hz are called infrasonics, while frequencies beyond $20$ kHz are called ultrasonics. Ultrasonics can be heard by dogs, cat, bats, etc. Bats detect the path by means of ultrasonics. Ultrasonics can be used for diagnosis of turnover and other abnormalities within our body. This is known as ultrasonography. Ultrasonics are used to cure various diseases and to measure depth of oceans to detect submarines.

...view full instructions

Ultrasonics can be detected by:

A
Bats only

B
Human beings only

C
Bats and human beings

D
Neither bats nor human beings

Solution

Ultrasonic sound can be detected by Bats. They use ultrasonic waves to navigate and find insect prey.
Question 10
1 / -0

A sound wave, whose time period is $3\ s$ passes through a medium for $30\ s$ . The number of waves that had passed through is:

A
$10$ waves

B
$5$ waves

C
$1$ wave

D
$3$ waves

Solution

Given,
Time period, $T=3\ s$
Total time, $t=30\ s$
Number of waves, $n$

We know,
The time taken by the wave for one complete oscillation of the density or pressure of the medium is called the time period.
$T=\dfrac{t}{n}$

$\implies n=\dfrac{t}{T}$

$n=\dfrac{30}{3}$

$n=10$

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Re-Attempt Weekly Quiz Competition

Sound Test - 41

Result

Sound Test - 41

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SHARING IS CARING

Question 1

The liquid in the filled vessel absorbs the vibrations of the liquid molecules

The air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel

The density of air is less than the density of liquid contained in the vessel when filled

The kinetic energy of particles constituting the air column is greater as compared to the kinetic energy of particles of liquid column

Solution

Question 2

5 cm5 \ cm5 cm

10 cm10 \ cm10 cm

2.5 cm2.5 \ cm2.5 cm

Cannot be found

Solution

Question 3

Time period

Wavelength

Amplitude

frequency

Solution

Question 4

25 sec

10 sec

5 sec

50 sec

Solution

Question 5

2.5 s2.5\ s2.5 s

0.1 s0.1\ s0.1 s

0.25 s0.25\ s0.25 s

4 s4\ s4 s

Solution

Question 6

50 ms

100 ms

10 ms

5 ms

Solution

Question 7

5 Hz

10 Hz

50 Hz

500 Hz

Solution

Question 8

2.5 s2.5\ s2.5 s

2.5 ms2.5\ ms2.5 ms

2.5 μs2.5\ \mu s2.5 μs

25 s25\ s25 s

Solution

Question 9

Bats only

Human beings only

Bats and human beings

Neither bats nor human beings

Solution

Question 10

101010 waves

555 waves

111 wave

333 waves

Solution

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$5 \ cm$

$10 \ cm$

$2.5 \ cm$

$2.5\ s$

$0.1\ s$

$0.25\ s$

$4\ s$

$2.5\ s$

$2.5\ ms$

$2.5\ \mu s$

$25\ s$

$10$ waves

$5$ waves

$1$ wave

$3$ waves