Waves Test

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Waves Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

A stationary wave is the sum of

A
two opposite direction travelling wave

B
two opposite direction travelling wave with same frequency

C
two same direction travelling wave

D
none of the above

Solution

standing wave patterns are produced as the result of the repeated interference of two waves of identical frequency while moving in opposite directions along the same medium.
so the answer is B.
Question 2
1 / -0

A closed organ pipe is excited to produce the third overtone of the air column.Then it will have,

A
Three nodes and three antinodes

B
Four nodes and four antinodes

C
Four nodes and three antinodes

D
none of the above

Solution

Four nodes and three anti nodes
Question 3
1 / -0

Wave motion happens due to

A
propagation of energy

B
propagation of matter

C
propagation of both energy and matter.

D
None of these.

Solution

A wave propagates due to transmission of disturbance across the particles. This disturbance is an oscillation of the particles of the medium (or the wave in case of electromagnetic waves). When a wave propagates the successive particles get energy and start oscillating about their mean position hence it is energy which is transferred across the medium. In a wave propagation particles only vibrate across their positions but do not travel in the direction of the propagation of the wave. Matter does not actually travel across the medium.
Question 4
1 / -0

Which of the following is different from others?

A
Wavelength

B
Velocity

C
Frequency

D
Amplitude

Solution

Amplitude is independent of wavelength, velocity and frequency of oscillation.
Question 5
1 / -0

In stationary waves, nodes are the points where there is:

A
maximum displacement and minimum pressure change

B
minimum displacement and maximum pressure change

C
minimum displacement and minimum pressure change

D
maximum displacement and maximum pressure change

Solution

In physics, a standing wave or stationary wave is a wave that oscillates in time. But whose peak amplitude profile does not move in the space. The peak amplitude of the wave oscillations at any point is constant. Its oscillations at different points throughout the wave are in phase.
At the nodes in stationary waves, the pressure change is maximum while the displacement will be minimum. Therefore, option B is the correct statement.

Option B is correct.
Question 6
1 / -0

The figure shows a surface $$XY$$ separating two transparent media, medium - $$1$$ and medium - $$2$$. The lines $$ab$$ and $$cd$$ represent wavefronts of a light wave travelling in medium - $$1$$ and incident on $$XY$$. The lines $$ef$$ and $$gh$$ represents wavefronts of the light wave in medium - $$2$$ after refraction.
Light travels as a:

A
Parallel beam in each medium

B
Convergent beam in each medium

C
Divergent beam in each mediu,

D
Divergent beam in one medium and convergent beam in the other medium

Solution

Light travels in a parallel beam in each medium because the path difference between two waveform is equal in both the cases.
Question 7
1 / -0

A particle is executing SHM with an amplitude 4 cm. What time does it take to reach the distance equal to amplitude, if the particle starts from rest at t = 0 from the mean position

A
T

B
T/2

C
T/4

D
3T/4

Solution

Total time taken for one oscillation is T. Since the distance between the mean position and the amplitude = Total distance / 4, time taken =T/4

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

Which of the following waves does not travel in vacuum?

A
Seismic waves

B
X-rays

C
Light

D
Radio waves

Solution

Light, X-rays and radio waves are electromagnetic waves. They do not require medium for their propagation. They can travel through vacuum, seismic waves are mechanical waves. They require medium for their propagation. They do not travel in vacuum.
Question 9
1 / -0

Which of the following waves is udsed in sonography?

A
Radio waves

B
X-rays

C
Ultrasonic waves

D
Gamma rays

Solution

Ultrasonic waves are used in sonography.
Question 10
1 / -0

Two identical sinusoidal waves each of amplitude $$10 mm$$ with a phase difference of $$90^o$$ are travelling in the same direction in string. The amplitude of the resultant wave is :

A
$$5 mm$$

B
$$10 \sqrt{2} mm$$

C
$$15 mm$$

D
$$20 mm$$

Solution

Since the two waves are identical, they have same amplitudes with phase difference of $$90^o$$.
The amplitude of the resultant wave is,

$$A=\sqrt { a^2+b^2 } =\sqrt { a^2+a^2 } =a\sqrt { 2 } $$

Here, $$a=10 mm, A= 10 \sqrt{2} mm$$

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Re-Attempt Weekly Quiz Competition

Waves Test - 18

Result

Waves Test - 18

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SHARING IS CARING

Question 1

two opposite direction travelling wave

two opposite direction travelling wave with same frequency

two same direction travelling wave

none of the above

Solution

Question 2

Three nodes and three antinodes

Four nodes and four antinodes

Four nodes and three antinodes

none of the above

Solution

Question 3

propagation of energy

propagation of matter

propagation of both energy and matter.

None of these.

Solution

Question 4

Wavelength

Velocity

Frequency

Amplitude

Solution

Question 5

maximum displacement and minimum pressure change

minimum displacement and maximum pressure change

minimum displacement and minimum pressure change

maximum displacement and maximum pressure change

Solution

Question 6

Parallel beam in each medium

Convergent beam in each medium

Divergent beam in each mediu,

Divergent beam in one medium and convergent beam in the other medium

Solution

Question 7

T

T/2

T/4

3T/4

Solution

Question 8

Seismic waves

X-rays

Light

Radio waves

Solution

Question 9

Radio waves

X-rays

Ultrasonic waves

Gamma rays

Solution

Question 10

$$5 mm$$

$$10 \sqrt{2} mm$$

$$15 mm$$

$$20 mm$$

Solution

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