Question:
Fill in the blanks :
v = ? × ?
Sound
Q 1.
Fill in the blanks :
If a body repeats its back and forth, to and fro or up and down motion along a certain path, about a fixed point, in a certain time interval then the motion of such objects is said to be _____________.
Q 2.
Fill in the blanks :
The principle on which stethoscope works is _____ (reflection/ multiple reflection)
Q 3.
What type of wave is represented by density- distance graph?
Q 4.
What is speed of sound in air?
Q 5.
Describe an experiment to show that sound waves can be reflected.What are the laws of reflection of sound waves.
Q 6.
Distinguish between music and noise.
Q 7.
The sonic boom of an aircraft has a time period of 0 00005 s.Calculate the frequency of the sound produced.
Q 8.
Can sound waves travel through vacuum ?
Q 9.
A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?
Q 10.
What is sound ? Discuss the method of its production.
Q 11.
How are compressions and rarefactions produced near a source of sound ?
Q 12.
What are wavefronts?
Q 14.
What is audible range ?
Q 15.
What propagates along with the waves ?
Q 16.
What is acoustical transite ?
Q 17.
What is sonic boom and when is it heard ?
Q 18.
On what factors does the speed of sound in a material depend ?
Q 19.
Fill in the blanks :
Sound having frequency more than 20,000Hz is known as ___________.
Q 20.
How does sound travel in gases and liquids as longitudinal or as transverse waves?
Q 21.
What is reverberation?
Q 22.
Calculate the wavelength of a sound wave having a frequency 300 Hz and speed 330 m/s.
Q 23.
A man fires a gun towards a hill and hears its echo after 5 s.He then moves 340 m towards the hill and fires his gun again.This time he hears the echo after 3 s.Calculate the speed of sound.
Q 24.
Guess which has a higher pitch : a guitar or a car horn ?
Q 25.
Distinguish between loudness and intensity of sound.
Q 26.
The frequency of a source of sound is 100 Hz.How many times does it vibrate in a minute ?
Q 27.
What is a sonic boom ?
Q 28.
What is sound barrier ?
Q 30.
What is Sound? Why it is important for us?
Q 31.
Can sound wave travel in vacuum?
Q 32.
What type of waves can travel in vacuum? Give example(s).
Q 33.
What is the audible range?
Q 34.
A hospital uses an ultrasonic scanner to locate tumors in a tissue. What is the wavelength of sound in a tissue is which the speed of sound is 1.7 km/s. The operating frequency of the scanner is 4.2 MHz. (1MHz = 10
6 Hz).
Q 35.
An engine is approaching a hill at constant speed.When it is at a distance of 0.9 km,it blows a whisde,whose echo is heard by the driver after 5 s.If the speed of sound is 340 m/s,calculate the speed of the engine.
Q 36.
Does sound follow the same laws of reflection as light does ? Explain.
Q 37.
Give two practical applications of reflection of sound waves.
Q 38.
What is reverberation ? How can it be reduced ?
Q 39.
Discuss the role of medium in the propagation of sound.
Q 40.
How can you show that sound waves are longitudinal waves ?
Q 41.
Fill in the blanks :
When we hear music, the medium through which the sound transmitted is __________ (solid, liquid, gas)
Q 42.
Fill in the blanks :
Sound travels as successive ____________ and _____________ in the medium.
Q 43.
Fill in the blanks :
Waves transport _________ not matter.
Q 44.
Fill in the blanks :
In the case of ____________ wave, distance between two consecutive crests or troughs is known as wavelength.
Q 45.
Fill in the blanks :
v = ? × ?
Q 46.
Fill in the blanks :
Loudness of sound is measured in ___________.
Q 47.
Give examples of longitudinal waves.
Q 48.
Among solids, liquids and gases sound travels faster in which medium?
Q 49.
What is infrasonic? Give an example.
Q 50.
Give examples of organisms which can hear infrasonic?
