Introduction to Sound

Q. Which of the following statements is incorrect?

1. Sound transfer momentum
2. Sound travels in form of wave
3. Sound is a form of energy
4. Sound travels faster in vacuum than in air

Q. When sound waves travel in a medium

1. particles of medium travel from one place to another
2. there is no moisture in the atmosphere
3. disturbance travels from one place to another
4. both particles as well as disturbance travel from one place to another

Q.

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

1. linear waves

2. longitudinal waves

3. transverse waves

4. electromagnetic waves

Q. The hero of a western movie listens for an oncoming train by putting his ear to the track. Why does this method give an earlier warning of the approach of a train than just listening in the usual way?

1. Because frequency if sound is more inside the iron tracks

2. Sound travels faster in solids

3. Because it looks cool

4. None of these

Q. If I put a ringing bell inside a jar and seal the jar air tight will I be able to hear the ringing of the bell from outside?

1. True

2. False

Q. Velocity of sound in O_{​​​​​​2 ​​​​​​}gas at 0 degree is 320m/s. What will be the velocity of sound in mixture of two parts by volume of hydrogen and one part by volume of oxygen at the same temperature?

Q.

What do you understand by the following term:

Space

Q. Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels faster than light.

1. i & ii only
2. i, ii & iii only
3. ii, iii & iv only
4. i, ii & iv only

Q.

When we hear music, the medium through which the sound is transmitted is ____________

Q.

A stone is dropped into a well in which the level of water is below the top of the well. If v is the velocity of the sound then the time T after dropping the stone is.?

Q.

deduce an expression for newtons formula related to speed of sound and discuss the correction to this forlmul made by laplace

Q. A list of mediums is given below.
(i) wood (iii) air
(ii) water (iv) vacuum
In which of these mediums can sound travel?

1. iii & iv only
2. ii, iii & iv only
3. i & ii only
4. i, ii & iii only

Q. The hero of a western movie listens for an oncoming train by putting his ear to the track. Why does this method give an earlier warning of the approach of a train than just listening in the usual way?

1. Because frequency of sound is more inside the iron tracks
2. Sound travels faster in solids
3. Because it looks cool
4. None of these

Q. If I put a ringing bell inside a jar and seal the jar air tight will I be able to hear the ringing of the bell from outside?

1. True
2. False

Q. Why is the celling and wall behind the stage of good conference halls or concert halls made curved?

1. construction is efficient
2. to reflect sound in a specific direction,
3. it looks good
4. it absorbs sound effectively

Q. Sound travels in air with -

1. disturbance travels from one place to another.
2. particles of the air travels from one place to another.
3. both particles and disturbance travels from one place to another.
4. None of these

Q. Sound waves cannot travel in:

1. metal
2. vacuum
3. air
4. water
5. wood

Q. The shape of the sound board kept behind the speaker on the stage of a big hall is.

1. concave
2. convex
3. plain
4. uneven

Q. Mark the correct match.

1. Good reflectors of sound - Tiles, Marble slabs.
2. Bad reflectors of sound - Thick curtains, thick carpets.
3. Good absorbers of sound - Holed cardboard.
4. All

Q. If I put a ringing bell inside a jar and seal the jar air tight will I be able to hear the ringing of the bell from outside?

1. True
2. False

Q. Why are sound waves called mechanical waves?

Q.

A bucket kept under a running tap is getting filled with water. A person sitting at a distance is able to get an idea when the bucket is about to be filled.

What change takes place in the sound to give this idea?

Q.

A boy 2 km from a train puts his ear on the rails. He finds that the sound of train coming through the tracks is decreasing. He concludes that

1. The train is moving towards him

2. The train is moving away from him

3. the train is stationary

4. none of the above

Q. Sound waves cannot pass through

1. A solid-liquid mixture
2. An ideal gas
3. A liquid-gas mixture
4. A perfect vacuum

Q. What does the broken glass window Suggest?

Q. Elastic waves can travel through

1. solids only
2. gases only
3. liquids only
4. solids, liquids and gases

Q. Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room ?