Sound Test

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Sound Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

The frequency of sound waves can be expressed in

A
Hz

B
$$\dfrac{\text{Cycles}}{\text{second}}$$

C
$$s^{-1}$$

D
All of these

Solution

The frequency means the number of full cycle of the wave per second. So all the options can be used to express the frequency. They all have same dimensions $$[ T ]^{-1}$$.
Question 2
1 / -0

Hertz is the unit of:

A
Wavelength

B
Amplitude

C
Frequency

D
None of these

Solution

The number of cycles per unit time is known as frequency. The SI unit of frequency is Hertz $$(Hz)$$.
Question 3
1 / -0

When we pluck the wire of a sitar, the waves produced in the wire are

A
Longitudinal

B
Transverse

C
Sometimes longitudinal and sometimes transverse

D
Electromagnetic

Solution

A transverse wave is a moving wave that consists of oscillations occurring perpendicular (or right angled) to the direction of energy transfer. If a transverse wave is moving in the positive x-direction, its oscillations are in up and down directions that lie in the yz plane. In any pluck string instrument we are actually doing the same.
Question 4
1 / -0

If a wave completes $$24$$ cycles in $$0.8 \ s$$, the time period of the above wave would be (in seconds)

A
0.03

B
30

C
0.3

D
none of these

Solution

The time period is simply the time taken to complete one cycle.
Time $$t$$ for $$24$$ cycles $$=0.8 \ s$$
Time $$T$$ for $$1$$ cycle $$=\dfrac{ total \ time \ taken }{number \ of \ cycles} = \dfrac{0.8}{24} $$
$$\therefore$$ Time period $$ T=\dfrac{8}{240}=\dfrac{1}{30}=0.0333 \ s \approx 0.03 \ s$$
Option A is the answer.
Question 5
1 / -0

Echo is produced due to :

A
Reflection of sound

B
Resonance

C
Refraction of sound

D
None of these

Solution

An echo is a reflection of sound, arriving at the listener sometime after the direct sound.
Question 6
1 / -0

The sound propagates in a gaseous medium by

A
Transverse waves

B
Longitudinal waves

C
Both (a) and (b)

D
None of these

Solution

For transverse wave, cohesion is an important property in the medium through which the wave energy can be transported. Gas does not have such a cohesion property. Hence there is no chance for transverse waves to be propagated through gas medium. So the sound propagates in a gaseous medium by longitudinal wave.
Question 7
1 / -0

The waves in which the particles of the medium travel in the same direction as the waves, are :

A
Linear waves

B
Longitudinal waves

C
Transverse waves

D
Electromagnetic waves

Solution

Longitudinal waves are waves in which the individual particles of the medium move in a direction parallel to the direction of propagation of the disturbance. The particles do not move from one place to another but they simply oscillate back and forth about their position of rest.
Question 8
1 / -0

The waves which propagate in metals are

A
Longitudinal

B
Transverse

C
Both (a) and (b)

D
None of these

Solution

In solids, there are two kinds of acoustic waves -- longitudinal [the medium is vibrating in the direction of the acoustic wave] and transverse [the medium is vibrating at right angles to the direction of propagation]. The speed of sound is greater for longitudinal waves. The trend in the speed of sound is: the harder the material and the lower density - the faster is the speed of sound.
Question 9
1 / -0

Fill in the blank.
Sound waves in air are __________waves.

A
Longitudinal

B
Radial

C
Transverse

D
Electromagnetic

Solution

Longitudinal waves are waves in which the motion of the individual particles of the medium is in a direction that is parallel to the direction of energy transport. Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.
Question 10
1 / -0

A sound wave travels by a speed of $$330\ ms^{-1}$$ in air. If the wavelength of the wave is $$110\ cm$$, the frequency of the wave is _______.

A
$$100\ Hz$$

B
$$200\ Hz$$

C
$$300\ Hz$$

D
$$400\ Hz$$

Solution

Given,
Speed of sound n air, $$v = 300\ ms^{-1}$$
Wavelength, $$ \lambda = 110\ cm = 1.1\ m$$
Frequency, $$f$$
We know,
$$v = f \lambda$$

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

$$\implies f=\dfrac{330}{1.1}$$

$$f=300\ Hz$$

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Re-Attempt Weekly Quiz Competition

Sound Test - 29

Result

Sound Test - 29

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SHARING IS CARING

Question 1

Hz

$$\dfrac{\text{Cycles}}{\text{second}}$$

$$s^{-1}$$

All of these

Solution

Question 2

Wavelength

Amplitude

Frequency

None of these

Solution

Question 3

Longitudinal

Transverse

Sometimes longitudinal and sometimes transverse

Electromagnetic

Solution

Question 4

0.03

30

0.3

none of these

Solution

Question 5

Reflection of sound

Resonance

Refraction of sound

None of these

Solution

Question 6

Transverse waves

Longitudinal waves

Both (a) and (b)

None of these

Solution

Question 7

Linear waves

Longitudinal waves

Transverse waves

Electromagnetic waves

Solution

Question 8

Longitudinal

Transverse

Both (a) and (b)

None of these

Solution

Question 9

Longitudinal

Radial

Transverse

Electromagnetic

Solution

Question 10

$$100\ Hz$$

$$200\ Hz$$

$$300\ Hz$$

$$400\ Hz$$

Solution

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