Test Details

Sound

Feb 11, 1:45 PM

30 minutes

Feb 11, 2:15 PM

60.0 marks

MCQ

30 questions

Sambhu Sir,

Class Details

General Science

Class VIII

General Science

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Question Text

Question 4 :
A simple pendulum makes 10 oscillations in 20 seconds. What is the time period and frequency of its oscillation?

Question 6 :
The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

Question 7 :
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 slower than light.

Question 8 :
Noise pollution may cause partial hearing impairment. Is that correct ?

Question 9 :
State True or False: For human ears, the audible range is 20 Hz to 20,000 Hz

Question 10 :
Presence of excessive or unwanted sounds in the environment is called ______

Question 13 :
State True or False: The lower the frequency of vibration, the higher is the pitch.

Question 14 :
State True or False: Noise pollution may cause partial hearing impairment.

Question 15 :
Presence of excessive noise in the surroundings may cause many health related problems. True or false ?

Question 16 :
A list of mediums is given. (i) wood (ii) water (iii) air (iv) vacuum. In which of these mediums can sound travel?

Question 19 :
State True or False: Unwanted or unpleasant sound is termed as music.

Question 21 :
An object is vibrating at 50 hertz. What is its time period?

Question 22 :
For human ear, the range of audible frequencies is roughly from _____ to _____ Hz.

Question 26 :
A pendulum oscillates 40 times in 4 seconds. Find its time period.

Question 28 :
Boojho saw a cracker burst at night at a distance from his house. He heard the sound of the cracker a little later after seeing the cracker burst. Give reason for the delay in hearing the sound.

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