Test Details

Sound

Feb 04, 1:30 PM

60 minutes

Feb 05, 2:30 PM

100.0 marks

MCQ

50 questions

Prabhat Dadhich

science/maths/answer creator

Class Details

Science

Class 8th

Science

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Question Text

Question 2 :
How can we recognize many familiar sounds without seeing the objects producing them?

Question 3 :
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.

Question 5 :
Presence of excessive or unwanted sounds in the environment is called ______

Question 8 :
Suppose a stick is struck against a frying pan in vacuum. Will the frying pan vibrate?

Question 10 :
When sound enters into ear, it travels down a canal at the end of which there is a thin stretched membrane. It is called the __________.

Question 11 :
A pendulum oscillates 40 times in 4 seconds. Find its frequency.

Question 12 :
A simple pendulum makes 10 oscillations in 20 seconds. What is the time period and frequency of its oscillation?

Question 14 :
State True or False: The number of oscillations per second of a vibrating object is called its time period.

Question 16 :
Fill in the blank: Time taken by an object to complete one oscillation is called ______.

Question 19 :
Presence of excessive noise in the surroundings may cause many health related problems. True or false ?

Question 21 :
Does the voice of a woman has a higher frequency than that of a man ?

Question 23 :
The shape of the outer part of the ear is like a _____.

Question 24 :
Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house would you suggest your parents should buy?

Question 26 :
Time taken by an object to complete one oscillation is called __________.

Question 27 :
We have a stringed musical instrument. The string is plucked in the middle first with a force of greater magnitude and then with a force of smaller magnitude. In which case would the instrument produce a louder sound?

Question 29 :
When we strike the membrane of a 'mridangam', we hear some sound. It's the sound of

Question 30 :
State True or False: The lower the frequency of vibration, the higher is the pitch.

Question 31 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0abf59b460d7261f333.jpeg' /> In the above figure an alarm bell is kept inside a vessel. A person standing close to it can distinctly hear the sound of alarm. Now if the air inside the vessel is removed completely how will the loudness of alarm get affected for the same person?

Question 34 :
Fill in the blank: Shrillness of a sound is determined by the _____ of vibration.

Question 36 :
Which of the following voices is likely to have minimum frequency?

Question 37 :
The to and fro motion of an object is known as _______ motion.

Question 38 :
A pendulum oscillates 40 times in 4 seconds. Find its time period.

Question 44 :
Lack of sleep, hypertension, anxiety and many more health disorders may be caused by ______________

Question 47 :
Paheli: When we speak, do we also vibrate any part of our body?

Question 48 :
The shrillness of a sound is determined by the __________ of vibration.

Question 49 :
In order to reduce the loudness of a sound we have to

Question 50 :
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?

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