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question_answer1)
The velocity of sound in air is not affected by change in
A)
moisture content of the air done
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B)
the temperature of air done
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C)
the atmospheric pressure done
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D)
the composition of air done
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question_answer2)
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_answer3)
It is possible to distinguish between transverse and longitudinal waves by studying the property of
A)
interference done
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B)
diffraction done
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C)
reflection done
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D)
polarization done
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question_answer4)
Mechanical waves having a frequency above the audible range, are called
A)
sonic done
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B)
ultrasonics done
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C)
infrasonics done
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D)
supersonics done
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question_answer5)
Ultrasonic waves produced in a medium can be detected by
A)
Kundt's tube done
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B)
Quincke's Method done
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C)
A Telephone done
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D)
Hebb's method done
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question_answer6)
Ultrasonic waves are used for stirring liquid solutions because
A)
they do not produce noise during the operation done
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B)
they do not produce chemical reactions in the solutions done
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C)
they are easy to produce done
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D)
they can produce perfectly homogeneous solutions done
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question_answer7)
There is no transmission of energy in
A)
electromagnetic wave done
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B)
transverse progressive waves done
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C)
longitudinal progressive wave done
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D)
stationary waves done
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question_answer8)
When ultrasonic, infrasonic and audible waves travel through a medium with speeds \[{{\upsilon }_{u}},{{\upsilon }_{i}}\] and \[{{\upsilon }_{a}}\] respectively, then
A)
\[{{\upsilon }_{u}},{{\upsilon }_{i}}\,and\,{{\upsilon }_{a}}\] are nearly equal done
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B)
\[{{\upsilon }_{u}}\ge {{\upsilon }_{a}}\,\ge \,{{\upsilon }_{i}}\] done
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C)
\[{{\upsilon }_{c}}\le {{\upsilon }_{a}}\,\ge \,{{\upsilon }_{i}}\] done
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D)
\[{{\upsilon }_{a}}\le {{\upsilon }_{u}}\,and\,\,{{\upsilon }_{u}}\approx {{\upsilon }_{i}}\] done
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question_answer9)
At what temperature will the speed of sound in air become double of its speed at \[0{}^\circ C\]?
A)
\[619{}^\circ C\] done
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B)
\[719{}^\circ C\] done
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C)
\[819{}^\circ C\] done
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D)
\[919{}^\circ C\] done
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question_answer10)
The product of the time period of a wave and its frequency is
A)
infinite done
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B)
zero done
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C)
more than unity but less than infinity done
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D)
unity done
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question_answer11)
If a wave completes 20 vibrations in 2.5 s, then its frequency is
A)
20 Hz done
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B)
8 Hz done
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C)
200 Hz done
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D)
50 Hz done
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question_answer12)
Imagine a cannon being fired on the surface of the moon. Then the sound will
A)
be heard at the surface of the earth during all seasons done
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B)
not be heard at the surface of the earth done
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C)
be heard at the surface of the earth during the rainy season done
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D)
not be heard on the earth or of the moon done
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question_answer13)
Stationary waves are formed when
A)
two waves of equal amplitude and equal frequency travel along the same path in opposite direction done
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B)
two waves of equal wavelengths and amplitude travel along the same path with equal speeds in opposite directions done
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C)
two waves of equal wavelength and equal phase travel along the same path with same speed done
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D)
two waves of equal amplitude and speed travel along the same path in opposite directions done
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question_answer14)
Beats are the result of
A)
diffraction done
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B)
destructive interference done
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C)
constructive and destructive interference done
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D)
superposition of two waves of nearly equal frequencies done
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question_answer15)
In which of the following media will sound travel the fastest?
A)
Solid done
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B)
Both solid and liquid done
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C)
Liquid done
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D)
Gas done
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question_answer16)
Sound waves in air are _____________ waves.
A)
longitudinal done
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B)
radio done
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C)
transverse done
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D)
electromagnetic done
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question_answer17)
Sound waves cannot pass through
A)
a solid-liquid mixture done
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B)
an ideal gas done
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C)
a liquid-gas mixture done
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D)
a perfect vacuum done
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question_answer18)
Which of the following frequency 3 not clearly audible to the human ear?
A)
30 Hz done
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B)
30,000 Hz done
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C)
300 Hz done
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D)
3000 Hz done
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question_answer19)
The frequency of sound waves can be expressed in
A)
Hz done
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B)
cycles/second done
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C)
\[{{\text{s}}^{-\text{1}}}\] done
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D)
all of these done
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question_answer20)
Frequency (v) and time period (T) are related as
A)
\[v\times T=1\] done
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B)
\[\frac{v}{T}=1\] done
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C)
\[v={{T}^{2}}\] done
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D)
\[v={{T}^{-2}}\] done
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question_answer21)
A body produces sound only if, it is
A)
made of steel done
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B)
made of glass done
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C)
plucked done
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D)
vibrating done
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question_answer22)
If the time period of a wave increases, then its frequency will
A)
increase done
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B)
decrease done
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C)
remain the same done
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D)
first increases then decreases done
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question_answer23)
A pulse is a wave
A)
of high duration done
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B)
of short duration done
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C)
which travels in vacuum only done
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D)
which travels in solids only done
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question_answer24)
Frequency of the sinusoidal wave, \[y=0.40\,\,\cos \,\,(2000t+0.080)\]would be
A)
\[\text{1}00\text{ 7}\pi \text{ Hz}\] done
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B)
\[\text{2000}\,\,\text{Hz}\] done
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C)
\[\text{20}\,\,\text{Hz}\] done
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D)
\[\frac{1000}{\pi }\,\,\text{Hz}\] done
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question_answer25)
The speed of sound waves in an atmosphere of helium at \[0{}^\circ C\] and 1 aim. Pressures is (4g helium under STP has a volume of \[22.4\]liter and \[\lambda =1.67\]for He)
A)
1073 m/sec done
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B)
973 m/sec done
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C)
873 m/sec done
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D)
773 m/sec done
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question_answer26)
A sound has an intensity of \[3\times {{10}^{-8}}W/{{m}^{2}}\].What is the sound level in dB (decibels)? (Given,\[\log \,\,3=0.477\])
A)
4.477 dB done
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B)
0.4477 dB done
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C)
44.77 dB done
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D)
44.7 dB done
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question_answer27)
If the frequency of a wave is doubled, then its wavelength
A)
becomes doubled done
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B)
remains same done
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C)
becomes half of the original done
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D)
none of these done
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question_answer28)
A man fires a shot and hears an echo from a cliff after 2 seconds. He walks 85 m towards the cliff and echo of a second shot is now heard after \[1.5\]second. What is the velocity of sound?
A)
85 m/sec done
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B)
170 m/sec done
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C)
340 m/sec done
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D)
680 m/sec done
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question_answer29)
The tones that are separated by three octaves have a frequency ratio of
A)
8 done
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B)
16 done
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C)
3 done
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D)
6 done
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question_answer30)
Speed of Sound wave in a given medium is
A)
directly proportional to its frequency done
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B)
inversely proportional to its frequency done
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C)
directly proportional to the square of frequency done
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D)
independent of its frequency done
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question_answer31)
Supersonic means
A)
frequencies less than 20 Hz done
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B)
same as ultrasonic done
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C)
frequencies much more than that of ultrasonics done
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D)
same as infrasonics done
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question_answer32)
In ordinary talk, amplitude of the vibration approximately
A)
\[\text{1}0.\text{7}\]metres done
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B)
\[\text{1}0.\text{9}\]metres done
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C)
\[\text{1}0.\text{11}\]metres done
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D)
\[\text{1}0.\text{13}\]metres done
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question_answer33)
pluck then wire of a sitar, the waves produced in the wire are
A)
longitudinal done
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B)
transverse done
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C)
sometimes longitudinal and sometimes transverse done
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D)
electromagnetic done
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question_answer34)
The term reverberation time is generally Understood to be the reverberation time at which of the following frequencies?
A)
1024 Hz done
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B)
2048 Hz done
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C)
512 Hz done
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D)
256Hz done
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question_answer35)
Toning fork for A has frequency 1% greater than that of standard fork B while tuning fork C has frequency 2% smaller than that of B. When A and B are sounded together, then number of beats heard per second is 5. The frequency of tuning fork C is approximately
A)
93 Hz done
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B)
163 Hz done
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C)
233 Hz done
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D)
283 Hz done
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question_answer36)
If frequency of a wave is 5 Hz, then it is
A)
Ultrasonics done
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B)
Microwaves done
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C)
Infrasonics done
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D)
Radio waves done
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question_answer37)
When a vibrating tuning fork is placed on a table, then a large sound is heard due to
A)
forced vibrations done
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B)
resonance done
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C)
beats done
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D)
reflection done
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question_answer38)
If a wave completes 24 cycles in 0.8 s, then frequency of the wave is
A)
30 Hz done
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B)
8 Hz done
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C)
24 Hz done
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D)
12 Hz done
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question_answer39)
The time period of the above wave would be
A)
\[\frac{1}{30}s\] done
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B)
30 s done
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C)
\[\frac{1}{24}s\] done
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D)
none of these done
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question_answer40)
Relation between frequency (\[v\]) and wavelength\[\lambda \]is
A)
\[\upsilon =v\times \lambda \] done
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B)
\[\upsilon =\frac{\lambda }{v}\] done
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C)
\[\upsilon =\frac{v}{{{\lambda }^{2}}}\] done
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D)
none of these done
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question_answer41)
Pitch of the sound depends upon its
A)
wavelength done
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B)
frequency done
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C)
amplitude done
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D)
periodicity and regularity done
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question_answer42)
The waves in which the particles of the medium travel in the same direction as the waves, are
A)
linear waves done
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B)
longitudinal waves done
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C)
transverse waves done
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D)
electromagnetic waves done
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question_answer43)
There are three sources of sound of equal intensity with frequencies 400, 401, 402 vibrations /sec. The number of beats heard per second I s
A)
1 done
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B)
2 done
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C)
3 done
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D)
0 done
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question_answer44)
A tuning fork of unknown frequency when sounded ' with another of 256 Hz gives 4 beats/sec. When a loaded with a certain amount of wax it is found give 2 beats. The unknown frequency is
A)
240 Hz done
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B)
250 Hz done
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C)
260 Hz done
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D)
270 Hz done
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question_answer45)
Velocity of sound is maximum in
A)
iron done
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B)
mercury done
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C)
water done
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D)
air done
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question_answer46)
The waves which propagate in metals are
A)
longitudinal done
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B)
transverse done
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C)
both [a] and [b] done
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D)
none of these done
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question_answer47)
Velocity of sound is minimum in
A)
nitrogen done
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B)
hydrogen done
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C)
air done
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D)
carbon dioxide done
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question_answer48)
The distance between two consecutive points in the same phase is called
A)
pitch done
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B)
velocity done
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C)
wavelength done
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D)
period done
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question_answer49)
The sound takes maximum time to travel from one place to another
A)
at night done
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B)
during summer done
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C)
during winter done
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D)
all the time same done
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question_answer50)
The sound propagates in a gaseous medium by
A)
transverse waves done
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B)
longitudinal waves done
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C)
both [a] and [b] done
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D)
none of these done
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question_answer51)
If a wave of wavelength \[\lambda \] is travelling in a medium with velocity V, then its frequency is
A)
\[\frac{V}{\lambda }\] done
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B)
\[V\lambda \] done
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C)
\[\frac{\lambda }{V}\] done
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D)
\[\frac{1}{V}\] done
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question_answer52)
If a wave of time period T travels with a velocity V, then the wavelength is
A)
\[\frac{V}{T}\] done
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B)
\[VT\] done
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C)
\[\frac{1}{VT}\] done
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D)
\[\frac{V}{T}\] done
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question_answer53)
The persistence of hearing for human beings is not more than
A)
1 s done
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B)
\[\frac{1}{5}s\] done
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C)
\[\frac{1}{10}s\] done
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D)
\[\frac{1}{2}s\] done
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question_answer54)
Vibrations, whose amplitudes of oscillations decrease with time are called
A)
free vibrations done
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B)
forced vibrations done
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C)
damped vibrations done
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D)
none of these done
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question_answer55)
Waves produced due to the earthquake are known as
A)
seismic waves done
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B)
shock waves done
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C)
infrasonic waves done
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D)
none of these done
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question_answer56)
Which of the following type of waves is different from others?
A)
Light waves done
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B)
X-rays done
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C)
Radio waves done
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D)
Sound waves done
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question_answer57)
Waves that can not travel in vacuum are
A)
X-rays done
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B)
infra sonics done
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C)
ultraviolet done
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D)
radio waves done
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question_answer58)
If the pitch of the sound of a source appears to drop by 10% to a moving person, then the velocity of motion is (velocity of sound = 330 m/sec)
A)
33 m/sec done
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B)
47 m/sec done
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C)
56 m/sec done
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D)
63 m/sec done
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question_answer59)
A sound wave is travelling from East to West. In which direction do the molecules in the air move?
A)
East to West done
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B)
West to East done
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C)
North to South done
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D)
South to North done
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question_answer60)
Two engines each other travelling in opposite directions at 72 km/hr. One engine sounds a whistle of frequency 1088 cps. If the speed of sound is \[340m/\sec \] then frequency heard by the observer on the other engine after crossing will be
A)
9670 Hz done
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B)
967 Hz done
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C)
96.7 Hz done
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D)
9.67 Hz done
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question_answer61)
Two trains move towards each other with the same speed. The speed of sound is 340 m/sec. If the height of the tone of the whistle of one of them heard on the other changes 9/8 times, then the speed of each train should be
A)
2000 m/sec done
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B)
200 m/sec done
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C)
20 m/sec done
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D)
2 m/sec done
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question_answer62)
Echo is produced due to
A)
reflection of sound done
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B)
resonance done
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C)
refraction of sound done
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D)
none of these done
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question_answer63)
The echo will be heard if the original sound reflected by an obstacle reaches our ears after
A)
10 s done
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B)
5 s done
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C)
1 s done
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D)
0.1 s done
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question_answer64)
SONAR is based on the principle of
A)
echo done
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B)
resonance done
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C)
reverberation done
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D)
none of these done
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question_answer65)
Which of the following frequency of sound can't be heard by human beings?
A)
5 Hz done
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B)
10 Hz done
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C)
100 Hz done
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D)
1000 Hz done
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question_answer66)
Which of the following frequency of sound can't be heard by human beings?
A)
40 Hz done
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B)
400 Hz done
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C)
4000 Hz done
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D)
40,000 Hz done
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question_answer67)
Velocity of sound in air is about
A)
330 m/s done
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B)
300 m/s done
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C)
270 m/s done
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D)
180 m/s done
clear
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