Sound Test

Result

Sound Test - 64

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Weekly Quiz Competition

Question 1
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 2
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.
$$T=\dfrac{t}{n}$$

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

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

$$n=10$$
Question 3
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 4
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 5
1 / -0

When a sound wave enters from one medium to another, the following parameters will vary

A
frequency and wavelength

B
frequency and wave velocity

C
velocity and wavelength

D
velocity and frequency

Solution

We know that for a wave, $$\text{Velocity} = \text{frequency}\times \text{wavelength}$$
The frequency of a sound wave is the characteristic of the source and it does not vary when the wave moves from one medium to another medium.
So, the velocity and the wavelength of the sound wave changes by changing the medium.

The correct option is (c)
Question 6
1 / -0

A sonar echo takes $$5s$$ to return from a submarine. If the speed of sound in water is $$1500 \,ms^{-1}$$, then the distance of submarine from the sonar station is:

A
$$7500 \,m$$

B
$$3500 \,m$$

C
$$3750 \,m$$

D
$$300 \,m$$

Solution

distance travelled $$= 2x$$
time taken $$= 5$$ seconds

$$s=\dfrac{ d}{t}; s= 1500 \,m/s$$

$$\therefore d = s \times t$$
$$d= 1500 \times 5 $$
$$= 7500 \,m$$

$$\therefore$$ position of submarine $$= \dfrac{7500}{2} = 3750 \,m$$
Question 7
1 / -0

A wave moving in gas:

A
Must be longitudinal

B
May be longitudinal

C
Must be transverse

D
May be transverse

Solution

A wave moving in gas must be longitudinal and not transverse because longitudinal waves can travel through gas whereas transverse sound waves can only travel through solids and surfaces of liquids but not through gas or air.
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
1 / -0

The relation between frequency $$f$$, wavelength $$\lambda$$, and velocity of propagation $$v$$ of a wave is:

A
$$f = v\lambda $$

B
$$f = \dfrac{\lambda }{v}$$

C
$$f = \dfrac{v}{\lambda }$$

D
$$f = \dfrac{1}{{v\lambda }}$$
Question 10
1 / -0

Hearing of repetition of sound after reflection from a distant object is called :

A
reverberation

B
resonance

C
echo

D
none of the above.

Solution

The repetition of original sound which is heard after the sound is reflected from a distant, dense and rigid object like high building, cliff etc. is called an echo.

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Re-Attempt Weekly Quiz Competition

Sound Test - 64

Result

Sound Test - 64

Score

-

Rank

-

SHARING IS CARING

Question 1

25 sec

10 sec

5 sec

50 sec

Solution

Question 2

$$10$$ waves

$$5$$ waves

$$1$$ wave

$$3$$ waves

Solution

Question 3

$$2.5\ s$$

$$0.1\ s$$

$$0.25\ s$$

$$4\ s$$

Solution

Question 4

5 Hz

0.5 Hz

20 Hz

2 Hz

Solution

Question 5

frequency and wavelength

frequency and wave velocity

velocity and wavelength

velocity and frequency

Solution

Question 6

$$7500 \,m$$

$$3500 \,m$$

$$3750 \,m$$

$$300 \,m$$

Solution

Question 7

Must be longitudinal

May be longitudinal

Must be transverse

May be transverse

Solution

Question 8

$$2.5\ s$$

$$2.5\ ms$$

$$2.5\ \mu s$$

$$25\ s$$

Solution

Question 9

$$f = v\lambda $$

$$f = \dfrac{\lambda }{v}$$

$$f = \dfrac{v}{\lambda }$$

$$f = \dfrac{1}{{v\lambda }}$$

Question 10

reverberation

resonance

echo

none of the above.

Solution

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