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question_answer1)
Ultrasonic waves have frequency
A)
below 20 Hz done
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B)
between 20 and 20,000 Hz done
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C)
only above 20,000 Hz done
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D)
only above 20,000 MHz done
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question_answer2)
Voice of your friend can be recognized by its
A)
pitch done
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B)
quality done
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C)
intensity done
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D)
velocity done
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question_answer3)
The ratio of the speed of a body to the speed of sound is called
A)
Sonic index done
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B)
Doppler ratio done
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C)
Mach number done
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D)
Refractive index done
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question_answer4)
The velocity of sound is largest in
A)
water done
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B)
air done
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C)
metal done
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D)
vacuum done
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question_answer5)
An underwater explosion is caused near the sea-shore. There are two observers, X under water and Yon land, each at a distance of 1 km from the point of explosion then
A)
X Twill hear the sound earlier done
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B)
y will hear the sound earlier done
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C)
Both will hear the sound at the same time done
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D)
Y will not hear the sound at all done
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question_answer6)
If you are at open-air concert and someone's head gets between you and the orchestra, you can still hear the orchestra because
A)
sound waves pass easily through a head done
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B)
a head is not very large compared with the wavelength of the sound done
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C)
the sound is reflected from the head done
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D)
the wavelength of the sound is much smaller than the head done
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question_answer7)
A thunder clap is heard 5.5 second after the lightening flash. The distance of the flash is (velocity of sound in air =330 m/s)
A)
1780m done
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B)
1815m done
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C)
300m done
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D)
3560m done
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question_answer8)
Which of the following is carried by the waves from one place to another?
A)
Mass done
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B)
Velocity done
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C)
Wavelength done
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D)
Energy done
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question_answer9)
Human ears can sense sound waves travel ling in air having wavelength of
A)
\[{{10}^{-3}}m\] done
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B)
\[{{10}^{-2}}m\] done
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C)
1m done
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D)
\[{{10}^{2}}m\] done
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question_answer10)
The frequency of a wave travelling at a speed of 500 \[m{{s}^{-1}}\] is 25Hz. Its time period is
A)
20s done
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B)
0.05s done
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C)
25s done
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D)
0.04s done
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question_answer11)
The velocity of sound in any gas depends upon
A)
wavelength of sound only done
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B)
density and elasticity of gas done
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C)
intensity of sound waves only done
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D)
amplitude and frequency of sound done
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question_answer12)
What is the effect of humidity on sound waves when humidity increases?
A)
Speed of sound waves is more done
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B)
Speed of sound waves is less done
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C)
Speed of sound waves remains same done
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D)
Speed of sound waves becomes zero done
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question_answer13)
Which of the following is used to find the depth of sea?
A)
RADAR done
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B)
SONAR done
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C)
ECHO done
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D)
None of these done
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question_answer14)
Echo is a type of
A)
reflected sound done
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B)
refracted sound done
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C)
neither reflected sound nor refracted sound done
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D)
None of these done
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question_answer15)
A shrill sound has a ____ pitch and a dull sound has a___ pitch.
A)
high, low done
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B)
low, high done
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C)
low, low done
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D)
high, high done
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question_answer16)
is the characteristic of a musical sound by which a loud sound can be distinguished from a faint sound even though both have the same pitch.
A)
Loudness done
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B)
Pitch done
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C)
Quality done
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D)
None of these done
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question_answer17)
If you go on increasing the stretching force on a wire in a guitar, its frequency.
A)
increases done
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B)
decreases done
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C)
remains unchanged done
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D)
None of these done
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question_answer18)
A vibrating body
A)
will always produce sound done
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B)
may or may not produce sound if the amplitude of vibration is low done
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C)
will produce sound which depends upon frequency done
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D)
None of these done
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question_answer19)
The wavelength of infrasonics in air is of the order of
A)
\[10{}^\circ m\] done
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B)
\[{{10}^{1}}m\] done
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C)
\[{{10}^{-1}}m\] done
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D)
\[{{10}^{-2}}m\] done
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question_answer20)
When a sound wave goes from one medium to another, the quantity that remains unchanged is
A)
frequency done
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B)
amplitude done
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C)
wavelength done
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D)
speed done
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question_answer21)
Resonance is an example of
A)
tuning fork done
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B)
forced vibration done
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C)
free vibration done
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D)
damped vibration done
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question_answer22)
A hollow sphere is filled with water. It is hung by a long thread. As the water flows out of a hole at the bottom, the period of oscillation will
A)
first increase and then decrease done
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B)
first decrease and then increase done
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C)
go on increasing done
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D)
go on decreasing done
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question_answer23)
If a tunnel is dug along the diameter of earth and a piece of stone is dropped into it, then the stone will
A)
come out of the another end of the earth and will escape out in space done
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B)
come to rest at the centre of the earth done
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C)
start oscillating about the centre of the earth done
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D)
stop at another end of the earth done
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question_answer24)
Which of the following statements is incorrect regarding the time period of a simple pendulum oscillating with small amplitude? The time period of the pendulum
A)
is inversely proportional to \[\sqrt{g}\] done
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B)
is directly proportional to \[\sqrt{l}\] done
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C)
does not depend upon the amplitude done
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D)
depends upon its mass, material and shape done
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question_answer25)
Range of audio-frequencies is
A)
1-15 Hz done
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B)
20-20,000 Hz done
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C)
\[{{10}^{3}}-{{10}^{5}}Hz\] done
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D)
\[{{10}^{6}}-{{10}^{8}}Hz\] done
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question_answer26)
The marching soldiers break steps while crossing a bridge because of
A)
damped oscillations done
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B)
resonance done
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C)
echo done
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D)
reverberation done
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