Mechanical Waves

Q.

To and fro motion of an object is also known as :

1. Circular motion

2. Accelerated motion

3. None of the above

4. Oscillatory motion

Q. Sound is a form of energy. Substantiate this statement with example. (5marks)

Q. The distance between a compression and the next rarefaction will be:
$\lambda :$ Wavelength

1. $\frac{\lambda }{4}$
2. $\lambda$
3. $\frac{\lambda }{2}$
4. $2\lambda$

Q. waves require a medium for their propagation.

1. Mechanical
2. Non-mechanical
3. Light

Q.

When a mechanical wave travels through a given medium, it loses energy to the medium.

1. True

2. False

Q.

Compression is a region of:

1. No pressure
2. High pressure
3. Low pressure
4. High frequency

Q.

Why are light waves able to travel in the vacuum not sound waves ?

Q.

Identify the part which vibrates to produce sound in Dholak

Q. In which of the following media can sound travel through?
(i) Glass of water
(ii) Balloon full of air
(iii) Iron bar
(iv) Vacuum

1. (i), (ii), (iii), and (iv)
2. (i), (ii), and (iii) only
3. (i) and (ii) only
4. (ii) and (iii) only

Q. Mechanical waves can not travel in .

1. vacuum
2. air
3. water

Q. What type of waves are sound waves: Longitudinal or Transverse? Explain your answer.

Q. waves require a medium for their propagation.

1. Mechanical
2. Non-mechanical
3. Light

Q.

do mechanical waves lose energy as they travel through a medium? Why/why not?

Q.

Why are sound waves called mechanical waves?

Q. Sound cannot travel through some solids, liquids and gases.

1. False
2. True

Q.

Sound is produced due to the vibrations of particles.

1. True

2. False

Q. Why can't I hear any thing even if someone whispered to one of the match box when the thread connecting it is slack?

Q. Sound waves are mechanical waves.

1. True
2. False

Q. Mexican waves observed in stadiums are analogous to waves.

1. transverse
2. longitudinal
3. non-mechanical

Q. Mexican waves observed in stadiums are analogous to waves.

1. transverse
2. non-mechanical
3. longitudinal

Q. Mexican waves observed in stadiums are analogous to waves.

1. non-mechanical
2. longitudinal
3. transverse

Q. Identify the part which vibrates to produce sound​ in the following instruments.​ [3 marks]

Q. Why does the sound reflect from hard surfaces as it can pass through it.

Q. Sound cannot travel through some solids, liquids and gases.

1. True
2. False