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CBSE Class 8 Science Worksheet

Sound

1.
To hear a train approaching from far away, why is it more convenient to put the ear to the track?
2.
Choose the correct answer: The magnitude of normal breathing sound is approximately _______________.
A) 5dB B) 10dB C) 55dB D) 20dB
3.
Fill in the blanks: Sound is produced by _______________ objects.
4.
Choose the correct answer: Loudness of sound is determined by its _______________.
A) Frequency B) Time period C) Amplitude D) Pitch
5.
State True or False: When the amplitude of vibration is large, the sound produced is loud.
A) true B) false
6.
Fill in the blanks: The part of our body which vibrates when we speak is _______________.
7.
Why can a sound not be heard on the moon?
8.
Fill in the blanks: The average rate of oscillations of a simple pendulum is 200 oscillations per seconds. Its time period in milliseconds is ____________.
9.
Choose the correct answer: What magnitude of noise can be physically harmful?
A) 30dB B) 50dB C) 90dB D) 40dB
10.
State True or False: Speed of sound is more in the air than in water.
A) true B) false
11.
Which of the following frequency of sound is heard by dogs, not humans?
A) 2.7kHz B) 15kHz C) 320Hz D) 22kHz
12.
State True or False: Sound can be produced by beating an object irrespective of whether there are vibrations or not.
A) true B) false
13.
Choose the correct answer: Unpleasant sound is called _________________.
A) Music B) Pitch C) Noise D) None of these
14.
Fill in the blanks: Time taken to complete one oscillation is called ____________ of the sound wave.
15.
State True or False: Speed of light is very high as compared to that of sound.
A) true B) false
16.
Fill in the blanks: The unit which is used to measure the loudness of sound is ______________.
17.
Choose the correct answer: What is determined by the frequency of the sound?
A) Amplitude B) Shrillness C) Vibration D) Oscillation
18.
Fill in the blanks: In humans, the sound vibrations make ____________ of ear vibrate.
19.
Why is lightning seen earlier and thunder is heard later when both take place in the sky at the same time?
20.
Write three sources of noise pollution.

CBSE Class 8 Science Worksheet

Sound

Answers

1.
Because sound travels faster through railway track (metal ) than through air.
2.
Option B

3.
Vibrating
4.
Option C
5.
Option A

6.
Larynx
7.
Because of the absence of air which is a medium for propagation for sound.
8.
5.0
9.
Option C
10.
Option B
11.
Option D
12.
Option B
13.
Option C

14.
Time period
15.
Option A

16.
Decibel
17.
Option B

18.
Eardrum
19.
Because light travels much faster than sound.
20.
(i) Bursting of crackers (ii) Vehicles without silencers (iii) Loudspeakers
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