Waves 2 – LearnITbyTests

1. Explain how a stationary wave is formed?

When 2 waves merge

When 2 equal progressive waves travelling in opposite direction are superimposed on each other

It occurs when 2 waves collide

None of the above

Question 1 of 28

2. Explain what type of diffraction will take place when a sound wave passes through a small aperture/hole which is almost equal to its wavelength.

It shall be diffracted as plane waves

It shall be diffracted as circular waves

It shall be refracted as circular waves

All the above

Question 2 of 28

3. Which property in a stationary vibrating wave does this formula represent? (Lambda/2)

Distance of a wavelength

Distance between successive nodes

Distance between successive antinodes

No idea

Question 3 of 28

4. What is the name of the lowest frequency that can be obtained when a musical instrument is played and forms the fundamental note?

Harmonic

Overtone

Fundamental frequency

None

Question 4 of 28

5. Define constructive interference?

Occurs when the amplitude of the resulting pulse is bigger than that of the individual pulses

When 2 waves collide and create things

When 2 waves merge and the resulting pulse has zero amplitude

None of the mentioned

Question 5 of 28

6. Explain how a sound wave undergoes refraction during the night?

The layer of air close to the ground is cooler than the air higher above

As sound produced in the higher parts of the wave fronts move faster than in the lower parts due to the lower temperature below

Sound waves is refracted downwards due to the difference due to the difference in velocity hence sounds are louder and clearer at night?

All of the above

Question 6 of 28

7. Which property of wave which describes it as travelling in a straight line and perpendicular to the wave front?

Refraction

Rectilinear propagation

Diffraction of waves

Rectilinear of waves

Question 7 of 28

8. The distance between successive nodes or antinodes is (Lambda/2). The distance between a node and the next antinode is (Lambda/4).

False

True

Maybe

None

Question 8 of 28

9. Which of the following is among the properties of a travelling wave?

Rectilinear propagation

Refraction

Diffraction

All of the above

Question 9 of 28

10. Which of the following statements is CORRECT about a water wave travelling from a deep region to shallow region?

A decrease in wavelength is observed

A decrease in speed in the shallow region since V = f x Lambda

The frequency of the water wave remains the same both in deep and shallow region

All of the above

Question 10 of 28

11. Mention what occurs when waves move from one medium to another?

Reflection of waves

Rectilinear propagation

Refraction

Diffraction of waves

Question 11 of 28

12. Which property in a stationary vibrating wave does this formula represent? (Lambda/4)

Distance between successive nodes (NN)

Distance between successive antinodes (AA)

Distance between node and the nearest antinode

Distance of successive wavelength

Question 12 of 28

13. Mention the 2 types of interference

Constructive interference

Collision interference

Destructive interference

no idea

Question 13 of 28

14. Which of the following is a CORRECT statement about a water wave which has been reflected (reflection properties of waves)?

Water waves are reflected from an obstacle in their path just like light and sound waves.

Water waves which have been reflected obey the laws of reflection

All wave motions can be reflected

All of the above

Question 14 of 28

15. Which property of a sound wave helps you to hear a sound round a corner or in another room even without seeing the source?

Reflection of sound wave

Refraction of sound wave

Rectilinear propagation of sound waves

Diffraction of sound waves

Question 15 of 28

16. Which of the following is not a condition for formation of stationary waves?

Two progressive waves should have should have same speed

Two progressive waves should have the same frequency

Two progressive waves should not be moving

Two progressive waves should be travelling in opposite directions

Question 16 of 28

17. Mention the properties of stationary wave

It is produced by superposition of 2 waves when a travelling wave is reflected back along its incident path.

A stationary wave has nodes at points of zero displacement and antinodes at points of maximum displacement

In a stationary wave, vibrations of particles at points between successive nodes are in phase.

All of the above

Question 17 of 28

18. Explain what type of diffraction which will take place when a sound wave passes through a wider aperture/ hole/ orifice?

It shall be diffracted as plane waves

It shall be diffracted as circular waves

It shall be refracted as circular waves

nothing shall happen

Question 18 of 28

19. Explain how a sound wave undergoes refraction during the day?

All of the below

The layer of air close to the ground is much warmer than the air higher above

A sound produced in the lower parts of the wave fronts move faster than in the upper parts due to the higher temperature below.

Sound waves is refracted upwards due to the difference in velocity

Question 19 of 28

20. Some points in a stationary wave where the wave has a maximum amplitude is called?

Antidote

Node

Antinode

None

Question 20 of 28

21. What is the name given to a note whose frequency is a whole number times the fundamental frequency?

Overtone

Harmonics

Note

None of the mentioned

Question 21 of 28

22. The first, second and third higher frequencies above the fundamental note are called?

First overtone

Second overtone

Third overtone

All of above

Question 22 of 28

23. Some points in a stationary wave where the wave is always at rest is called?

Antidote

Node

Antinode

None

Question 23 of 28

24. Which of the following differentiates a stationary wave from a progressive wave?

The distance between 2 successive nodes or antinodes in a stationary wave is (Lambda/2) while in progressive wave the distance between successive troughs or crests is Lambda.

In a stationary wave, vibrations of particles at points between successive nodes are in phase between progressive waves in phase of particles near each other are different.

In stationary wave, the amplitudes of particles between successive nodes is different but in progressive wave the amplitude of any 2 particles which are in phase are the same.

All of the above

Question 24 of 28

25. Define destructive interference?

When 2 waves merge and the resulting pulse has zero amplitude

When 2 waves collide and destroy things

When 2 waves merge and the resulting pulse has amplitude smaller than that of individual pulses

nothing shall happen

Question 25 of 28

26. Why is diffraction of light waves not a common phenomenon?

Light waves have very wide wavelength compared to water/ sound waves

Light waves have very long wavelength compared to water/ sound waves

Light waves have very short wavelength compared to water/ sound waves

None

Question 26 of 28

27. What is an interference of waves?

It occurs when a wave passes through an obstacle

It occurs when 2 waves merge

It occurs when 2 waves travel in opposite directions

None

Question 27 of 28

28. What is the name of the note which accompanies the fundamental note but are smaller in amplitude and of higher frequencies?

Harmonic

Overtone

Fundamental frequency

None

Question 28 of 28

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