Question 1 :
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 2 :
A list of mediums is given. (i) wood (ii) water (iii) air (iv) vacuum. In which of these mediums can sound travel?

Question 3 :
Voice of which of the following is likely to have minimum frequency?

Question 10 :
State True or False: Unwanted or unpleasant sound is termed as music.

Question 12 :
The shape of the outer part of the ear is like a _____.

Question 15 :
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 17 :
State True or False: For human ears, the audible range is 20 Hz to 20,000 Hz

Question 18 :
For human ear, the range of audible frequencies is roughly from _____ to _____ Hz.

Question 19 :
State True or False: The lower the frequency of vibration, the higher is the pitch.

Question 20 :
If the amplitude of vibration is large, sound is feeble. State true or false.

Question 23 :
Fill in the blank: Shrillness of a sound is determined by the _____ of vibration.

Question 24 :
A pendulum oscillates 40 times in 4 seconds. Find its frequency.

Question 25 :
Suppose a stick is struck against a frying pan in vacuum. Will we be able to hear the sound?

Question 26 :
Loudness of sound is proportional to the square of the amplitude of the vibration producing the sound. State true or false.

Question 27 :
A pendulum oscillates 40 times in 4 seconds. Find its frequency.

Question 32 :
Paheli: When we speak, do we also vibrate any part of our body?

Question 33 :
State True or False: The number of oscillations per second of a vibrating object is called its time period.

Question 35 :
An object is vibrating at 50 hertz. What is its time period?

Question 36 :
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 37 :
The shrillness of a sound is determined by the __________ of vibration.

Question 39 :
Lack of sleep, hypertension, anxiety and many more health disorders may be caused by ______________

Question 43 :
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 45 :
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 47 :
Fill in the blank: Time taken by an object to complete one oscillation is called ______.

Question 48 :
Does the voice of a woman has a higher frequency than that of a man ?

Question 50 :
<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?