Medium

Q.

Speed of sound is maximum in which among the following?

1. Gases

2. Vacuum

3. Liquids

4. Solids

Q.

When sound waves travel from a rarer medium to a denser medium, its speed

1. decreases

2. remain constant

3. increases

4. may increase or decrease

Q. Sound produced in a neighbouring room is audible where as the candle lit in the neighbouring room is not visible why??

Q.

Sound travels the fastest in which of the following mediums?

1. Water

2. Steel

3. Air

4. Kerosene oil

Q.

Place a ringing bell in a closed jar and then remove air completely from the jar through vaccum pump. Can we hear the ringing sound. Give the reason. [3 MARKS]

Q.

Arrange the materials in the decreasing order of the speed with which sound will travel through them: metal rod, air, water.

1. Metal rod, air, water.

2. Air , water, metal rod .

3. Metal rod , water, air.

4. Water, air, metal rod .

Q.

Loud noise can break glass panes. Which of the following conclusions can be drawn from this?

I. Sound is a form of energy.

II. Sound can’t travel through vacuum.

III. Sound can be used to do work.

1. Only III

2. I and II

3. I and III

4. I, II and III

Q.

Waves produced in the air are ________ (transverse/longitudinal).

Q. In which of the following medium sound will travel the fastest?

1. Air
2. Iron
3. Salt water
4. Water

Q.

Why are sound waves not transverse?

Q. Which of the following statement is correct regarding the propagation of sound waves?

1. By a particle moving from one place to another
2. By a particle moving about its fixed position, and influencing the particle next to it to do the same, and passing the trend to subsequent particles.
3. None of the above
4. Both A and B

Q. Sound is a

1. Longitudinal wave
2. Mechanical wave
3. Both A and B
4. Transverse wave

Q.

Statement 1: Sound needs a medium for its propagation.
Statement 2: Sound cannot propagate through vacuum as vacuum does not have particles which can vibrate.

1. Only statement 1 is true

2. Only statement 2 is true

3. Both the statements are true

4. Both the statements are false

Q. A mechanical wave needs a medium for propagation

1. True
2. False

Q.

Sound will travel in which of the following?

1. Oil

2. Iron

3. Water

4. Vacuum

Q.

Sound waves cannot travel through:

1. Liquids

2. Gases

3. Vacuum

4. Solids

Q.

Sound waves are always longitudinal in nature.

1. True

2. False

Q. A mechanical wave needs a medium for its propagation.

1. True
2. False

Q.

The speed of sound is different in different media.

1. True

2. False

Q.

There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously on both the phones, but sound comes only from box B. This is because:

Statement 1: In box B there are air particles to vibrate but in box A there is a vacuum.
Statement 2: Sound needs a medium for propagation.

1. Statement 1 is true and statement 2 is the correct explanation of statement 1

2. Statement 1 is true but statement 2 is not the correct explanation of statement 1

3. Statement 1 is true but statement 2 is false

4. Statement 1 is false but statement 2 is true

Q.

A mechanical wave needs a medium for propagation

1. False

2. True

Q.

A drum vibrates with a lower frequency as compared to a whistle. Then, we can say that:

1. The sound produced by the drum is louder than the whistle.

2. The sound produced by the whistle is louder than the drum.

3. The sound produced by the drum has a higher pitch than the whistle.

4. The sound produced by the whistle has a higher pitch than the drum.

Q.

Statement 1: Sound needs a medium for its propagation.
Statement 2: Sound does not propagate in a vacuum, as it does not have particles to vibrate.

1. Only statement 1 is true

2. Only statement 2 is true

3. Both the statements are true

4. Both the statements are false