[2 Mark Questions]

Question 12 Marks

A wave with a frequency of 500 Hz is traveling at a speed of 200 ms-1. What is the wavelength?

Question 22 Marks

A sound wave travels 2000 m in 8 s. What is the velocity of the sound?

Answer

Given data:
Distance travelled by a sound wave d = 2000 m
time taken t = 8s
To find: Velocity of sound V =?
Formula:
Velocity $V =\frac{\operatorname{distance}( d )}{\operatorname{time}( t )}$
$V=\frac{2000}{8}=250 ms ^{-1}$

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Question 32 Marks

Ruthvik and Ruha hear a gunshot 2 second after it is fired. How far away from the gun they are standing? (Speed of sound in air is equal to 330ms^-1)

Answer

Given data: time t = 2s
Speed of sound V = 330 ms^-1
To find: Distanced =?
Formula: Distance = Speed x time
Distance d = 330 x 2 = 660 m

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Question 42 Marks

How does planting trees help in reducing noise pollution?

Answer

Plant parts such as stems, leaves, branches wood, etc., absorb sound.
Rough bark and thick, fleshy leaves are particularly effective at absorbing sound due to their dynamic surface area and helps in reducing noise pollution.

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Question 52 Marks

What are the hazards of noise pollution?

Answer

Noise may cause irritation, stress, nervousness, and headache.
Long-term exposure to noise may change the sleeping pattern of a person.
Sustained exposure to noise may affect hearing ability. Sometimes, it leads to loss of hearing.
Sudden exposure to louder noise may cause a heart attack and unconsciousness.
The noise of horns, loud speakers, etc, causes disturbances leading to lack of concentration.
Noise pollution affects a person’s peace of mind.

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Question 62 Marks

Distinguish between music and noise.

Answer

Music	Noise
1. It is pleasant, smooth and agreeable to the ear.	1. It is harsh, discordant and displeasing to the ear.
2. It is produced by the vibrations which are periodic..	2. It is produced by an irregular succession of disturbances.
3. All the component waves are similar without any sudden change in their wavelength and amplitude.	3. The component wave changes their character suddenly and they are of short duration..
4. The sound level is low (below 30 dB).	4. The sound level is hiah (above 120 dB).

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Question 72 Marks

Give an example to show that light travels faster than sound?

Answer

Lightning:
The most common example of showing that light travels faster than sound is lightning. Whenever lightning strikes, you see the lightning first and then hear the thunder after some time.

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Science [2 Mark Questions]

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