GENERAL INSTRUCTIONS (Please read the following instructions very carefully)
1. Question marks are mentioned with each Question.
2. Please write neat and clean hand-writing on Answer Sheet. Use Margin on right side and left side of Answer Sheet.
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4. Do not click the button Submit Test before completing the paper on Answer Sheet.
5. This is a ONE TIME attempt test. Once started, it cannot be reversed or attempted again.
6. Take photo of all the Sheets and make single pdf file.
1
In order to reduce the loudness of a sound we have to
Decrease its frequency of vibration of the sound.
Increase its frequency of ibration of the sound.
Decrease its amplitude or vibration of the sound
Increase its amlitude of vabration of the sound
2
________________ is the part of a longitudinal wave in which the particles of the medium are closer to one another than they normally are and it is the region of high pressure.
Compression
Rarefaction
Both (a) and (b) are correct.
None of these.
3
Sound cannot travel in __________________ .
Air
Glass
Iron
Vacuum
4
Speed of sound at constant temperature depends :
Pressure
Density of gas
Humidity
None of these
5
If the amplitude of vibration is large, sound is ______________
feeble
loud
shril
none of these
6
A thunder clap is heard 5.5 second after the lighting the flash.The distance of the flash is (velocity of sound in air = 330 m/s
1780 m
1815 m
300 m
3560 m
7
If you are at open - air concert and someone's head gets between you and the orchestra, you can still hear the orchestra because :
Sound waves pass easily through a head
A head is not very large compared with the wavelength of the sound
The sound is reflected from the head
The wavelength of the sound is much smaller than the head
8
Sound can travel through
Gases only
Solids only
Liquids only
Solids, liquids and gases.
9
In which of the following gases will the speed of sound be highest ?
CO
10
The frequency of a source 20 kHz. The frequencies of sound wave produced by it on water and air will be __________________
Same as that of source = 20 kHz
> 20 kHz
< 20 kHz
Depends upon velocity
11
Pitch of sound depends upon _______ of a vibrating body.
Amplitude
Wavelength
Frequency
Refraction
12
The maximum possible displacement of a vibrating body from its mean position during its motion is equal to ____________
Its amplitude
Half its amplitude
Twice its amplitude
Its frequency
13
Assertion (A) : The pitch of the sound produced by the vibration string can be changed.
Reason (R) : The pitch of the sound can be changed by chaning the length, tension and thickness of the vibration string.
Both A and R correct and R is the correct explanation of A.
Both A and R correct and R is not the correct explanation of A.
A is correct and R is incottect
Both A and R are incorrect
14
Which of the following are correct :
(a) Sound needs a medium to propagate or travels
(b) Sound travels through solid liquid and gas
(c) Sound travels through vacuum.
Only (a) is correct.
Only (a) and (b) is correct.
Only (c) is correct.
Only (a) and (c) is correct.
15
(a) Transverse waves can be produced only in solids and liquids but not in gases.
(b) Longitudinal waves can be produced in all the three media such as solids, liquids and gases.
(c) Transverse waves can be produced in all the three media such as solids, liquids and gases.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.
All of these.