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Online Tests
11th Class Part 1 Physics Chapter 8 Test Online MCQs With Answers
Question # 1
With increase of temperature, speed of sound.
Choose an answer
Remains constant
Becomes zero
Decreases
Increases
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Question # 2
Speed of sound in aluminum at 20
o
C is.
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3600 m/s
5100 m/s
5130 m/s
3500 m/s
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Question # 3
The waves used in radar speed trap are
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Longitudinal
Sound wave
Micro waves
Matter waves
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Question # 4
Who did give the correct formula for the speed of sound in air?
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Boyle
Laplace
Newton
Einstein
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Question # 5
Wavelength of a wave for closed pipe having length 'l' in the fundamental mode is.
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2 l
1/2
4 l
l
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Question # 6
The distance between the consecutive nodes is
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Question # 7
In stationary waves the points which always remain at rest are.
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Nodes
Antinodes
Crest
Trough
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Question # 8
Two tuning forks of frequencies 240 Hz and 243 Hz are sounded together, the number of beats per second is.
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Zero
2
3
4
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Question # 9
In transverse waves the particles of medium vibrate
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Along the direction of wave
Opposite to direction of wave
Perpendicular to direction of wave
Slowly
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Question # 10
A set of frequencies which are multiples of the fundamental frequency are called.
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Doppler effect
Nodal frequencies
Beat frequencies
Hamonics
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Question # 11
Diffraction is a special type of
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Reflection
Polarization
Interference
Refraction
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Question # 12
Stars moving away from Earth show a
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Green shift
Blue shift
Red shift
Yellow shift
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Question # 13
The error in speed of sound calculated by Newton at STP is about.
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0 %
14 %
15 %
16 %
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Question # 14
Sound wave can not be
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Reflected
Refracted
Diffracted
Polarized
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Question # 15
When two identical travelling waves are superimposed, velocity of resultant wave.
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Decreases
Increases
Remain same
Becomes zero
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Question # 16
An oscillating mass-spring system produces
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Sound waves
Electromagnetic waves
Light waves
Periodic waves
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Question # 17
The wavelength of fundamental note in one end closed pipe in term of length 'l' of pipe is.
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4 l
2l
l
1/4 l
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