Waves Test

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Waves Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

The phenomenon of interference is shown by

A
longitudinal mechanical waves only

B
transverse mechanical waves only

C
non mechanical transverse waves only

D
all the above types of waves

Solution
Question 2
1 / -0

In ordinary talk, the amplitude of vibration is approximately:

A
$$10^{-12} m $$

B
$$10^{-11} m $$

C
$$10^{-8} m $$

D
$$10^{-7} m $$

Solution

In ordinary talk, the amplitude of vibration is about $$10^{-8}$$ $$m$$.
Question 3
1 / -0

'Which is not true for a wave ?

A
Wave velocity v = n$$\lambda$$

B
Energy is transferred during wave motion

C
All waves can pass through vacuum

D
Unit of wave velocity is $$m/s$$

Solution

(A) In a wave , frequency and wavelength are related by , $$v=n\lambda$$ .
(B) During wave motion , a disturbance (energy) is transferred by medium particles in a wave .
(C) Mechanical waves cannot travel through vacuum , because they are dependent on the properties of medium , so it is a wrong statement .
(D) Wave velocity is given by , $$v=n(s^{-1})\lambda(m)=m/s$$
Question 4
1 / -0

The velocity of sound in a gas is 4 times that in air at the same temperature. When a tuning fork is sounded in a wave of frequency 480 and wavelength $$\lambda_1$$ is produced. The same fork is sounded in the gas and of $$\lambda_2$$ is the wavelength of the wave, then $$\lambda_2\,/\, \lambda_1$$ is :

A
1

B
2

C
4

D
1/2

Solution

We have , $$v=f\lambda$$ ,
when tuning fork is sounded in air ,
$$v_{a}=f\lambda_{1}$$ , ........................eq1
when tuning fork is sounded in gas ,
$$v_{g}=f\lambda_{2}$$ , .......................eq2 ,
frequency will remain same as the source of sound is same ,
dividing eq2 by eq1 ,
$$v_{g}/v_{a}=\lambda_{2}/\lambda_{1}$$ ,....................eq3
now given , $$v_{g}=4v_{a}$$ ,
putting , $$v_{g}=4v_{a}$$ in eq3,
we get , $$4v_{a}/v_{a}=\lambda_{2}/\lambda _{1}$$ ,
or $$4=\lambda_{2}/\lambda _{1}$$
Question 5
1 / -0

In the following properties of a wave, the one which is independent of the other is

A
amplitude

B
velocity

C
wavelength

D
frequency

Solution

We know that velocity of wave $$(v)=$$ frequency $$(f) \times $$ wavelength $$(\lambda)$$.
Thus, we can say that the amplitude (A) is independent of other means it is not related to the other quantities.
Question 6
1 / -0

Time period of a sound wave having the wavelength $$0.2 m$$ and frequency $$10$$ Hz will be

A
$$2s$$

B
$$0.2s$$

C
$$0.1s$$

D
$$0.02s$$

Solution

Given - $$ n=10Hz$$ ,
we have , time period , $$T=1/n=1/10=0.1s$$
Question 7
1 / -0

The stethoscope used by doctors works on the principle of

A
Refraction of sound

B
Reflection of sound

C
Interference of sound

D
Absorption of sound

Solution

A stethoscope has an air filled tube with a diaphragm at its one end . When this diaphragm is placed on the chest of a patient , it vibrates due to faint sound coming from the chest , these vibrations are channelised through the air filled tube and amplified by multiple reflections by the inner walls of the tube , thus it is based on the principle of reflection .
Question 8
1 / -0

Two waves represented by $$y_1= a sin\omega t $$ and $$ y_2 = a sin(\omega t+ \phi) $$ and $$ \phi =\dfrac{\pi}{2} $$ are superposed at any point at a particular instant. The resultant amplitude is

A
$$ a$$

B
$$4a$$

C
$$\sqrt{2} a$$

D
$$zero$$

Solution

Since the angle between them is $$90$$, so $$cos\ 90^0=0$$
So, $$R=\sqrt {a^2+a^2}=\sqrt 2a$$
Question 9
1 / -0

The SI unit of amplitude of oscillation is :

A
$$cm$$

B
$$m$$

C
$$km$$

D
$$\mu m$$

Solution

amplitude is nothing but displacement and si unit of displacement is metres 'm'
Question 10
1 / -0

A source of frequency $$500 Hz$$ emits waves of wavelength $$0.2 \ m$$. The time the wave takes to travel a distance of $$300\ m$$ is :

A
75 seconds

B
60 seconds

C
12 seconds

D
3 seconds

Solution

We have , speed of wave , $$v=n\lambda$$ ,
where $$n=$$ frequency of wave ,
$$\lambda=$$ wavelength of wave ,
given $$n=500Hz , \lambda=0.2m , d=300m$$ ,
hence $$v=500\times0.2=100m/s$$ ,
therefore , time taken to cover a distance of 300m ,
$$t=d/v=300/100=3s$$

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Re-Attempt Weekly Quiz Competition

Waves Test - 12

Result

Waves Test - 12

Score

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Rank

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SHARING IS CARING

Question 1

longitudinal mechanical waves only

transverse mechanical waves only

non mechanical transverse waves only

all the above types of waves

Solution

Question 2

$$10^{-12} m $$

$$10^{-11} m $$

$$10^{-8} m $$

$$10^{-7} m $$

Solution

Question 3

Wave velocity v = n$$\lambda$$

Energy is transferred during wave motion

All waves can pass through vacuum

Unit of wave velocity is $$m/s$$

Solution

Question 4

1

2

4

1/2

Solution

Question 5

amplitude

velocity

wavelength

frequency

Solution

Question 6

$$2s$$

$$0.2s$$

$$0.1s$$

$$0.02s$$

Solution

Question 7

Refraction of sound

Reflection of sound

Interference of sound

Absorption of sound

Solution

Question 8

$$ a$$

$$4a$$

$$\sqrt{2} a$$

$$zero$$

Solution

Question 9

$$cm$$

$$m$$

$$km$$

$$\mu m$$

Solution

Question 10

75 seconds

60 seconds

12 seconds

3 seconds

Solution

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