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Online Tests
Physics Fsc Part 1 Chapter 8 Online Test MCQs With Answers
Question # 1
If a stretched string 4 m long and it has 4 loops of stationary waves, then the wave length is.
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1m
2 m
3 m
4 m
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Question # 2
Increase in the velocity of sound in air for 1
o
C rise in temperature is.
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61 ms-1
0.61 ms-1
161 ms-1
261 ms-1
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Question # 3
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 # 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
Two tunign forks of frequencies 260 Hz and 256 Hz are sounded together , the number of beats per second is.
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2
258
516
4
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Question # 6
Teh speed of sound in air is 340 m/s. If the pressure of air is doubled then the speed becomes.
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Double
Half
Four times
Remains same
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Question # 7
Which of the following is mechanical wave
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Heat
Light
Sound
None of these
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Question # 8
The speed of sound increases with the increase of in
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Pressure
Volume
Temperature
Density
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Question # 9
The periodic variations of sound between maximum and minimum loudness are called.
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Doppler's effect
reflection
Laplace correction
Beats
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Question # 10
the example of mechanical waves is
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Water waves
Infrared waves
Radio waves
Ultraviolet waves
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Question # 11
When two waves having same frequency traveling in same direction combine, phenomenon is called
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Wave motion
Combination of waves
Interference
Diffraction
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Question # 12
If the wave motion is 0.01 sec and wave speed is 100 ms-1 then frequency of wave is.
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0.5 Hz
1 Hz
10 Hz
100 Hz
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Question # 13
If 332 waves pass through a medium in 1 second with speed of 332 ms-1 then wavelength will be
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7 m
332 m
664 m
1 m
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Question # 14
Sound travel faster in
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CO2
H2
O2
He
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Question # 15
The speed of stars and galaxies can be calculated by
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Compton effect
Stefan's law
Doppler's effect
Pascal's law
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Question # 16
A stationary waves is established din a string which vibrates in four segments at a frequency of 120 Hz, Its fundamental frequency is.
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15 Hz
30 HZ
60 Hz
480 Hz
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Question # 17
Stars moving away from Earth show a
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Green shift
Blue shift
Red shift
Yellow shift
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