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Hassan
1.The speed of sound in oxygen (O2) at a certain temperature is 460m/s. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal).
A. 460m/s
B. 500m/s
C. 650m/s
D. 460m/s
2.Length of a string tied to two rigid supports is 40cm. Maximum length (wavelength in cm) of a stationary wave produced on it is?
A. 20
B. 80
C. 40
D. 20
3.A sound absorber attenuates the sound level by 20dB. The intensity decreases by a factor of?
A. 100
B. 1000
C. 10000
D. 100
4.The ratio of velocity of sound in hydrogen and oxygen at STP is?
A. 16:1
B. 8:1
C. 4:1
D. 16:1
5. It takes 2 seconds for a second wave to travel between two fixed points when the day temperature is 10°C. If the temperature rises to 30°C, the sound wave travels between the same fixed parts in?
A. 1.9 sec
B. 2 sec
C. 2.1 sec
D. 1.9 sec
6.The disc of a siren containing 60holes rotates at a constant speed of 360rpm. The emitted sound is in unison with a tuning fork of frequency.
A. 10Hz
B. 360Hz
C. 216Hz
D. 10Hz
7.The quantity which does not change, when sound enters from one medium to another?
A. Wavelength
B. Speed
C. Frequency
D. Wavelength
8.If wave y=Acos(ωt+kx) Is moving along x-axis, the shapes of a pulse at t=0 and t=2s.
A. Are different
B. Are same
C. May not be the same
D. Are different
9.y1=4sin⁡(ωt+kx), y2=-4cos⁡(ωt+kx), the phase difference is?
A. π/2
B. 3Ï€/2
C. π
D. π/2
10. A wave equation is y=0.1sin[100Ï€t-kx] and wave velocity is 100m/s, its number is equal to?
A. 1/m
B. 2/m
C. π/m
D. 1/m
11.A particle on the trough of a wave at any instant will come to the mean position after a time (T=time period).
A. T/2
B. T/4
C. T
D. T/2
12. A string is tied on a sonometer, second end is hanging downward through a pulley with tension T. The velocity of the transverse wave produced is proportional to?
A. 1/√T
B. √T
C. T
D. 1/√T
13.The fundamental frequency of a sonometer wire is n. If the tension is made 3 times and length and diameter are also increased 3 times, the new frequency will be?
A. 3n
B. n/3√3
C. n/3
D. 3n
14.Which of the following effects can be used to produce ultrasonic waves?
A. Magnetostriction effect
B. Doppler Effect
C. Magnetic effect
D. Magnetostriction effect
15.When is ultrasonic waves produced using piezo electric oscillator?
A. At constant temperature
B. At resonance
C. At constant pressure
D. At constant temperature
16.Which of the following causes acoustical grating?
A. Magnetic waves
B. Electric waves
C. Magnetostriction effect
D. Magnetic waves
17.What is the principle for measurement of the velocity of ultrasonic waves?
A. Magnetostriction effect
B. Acoustical grating
C. Doppler Effect
D. Magnetostriction effect
18.What is cold welding?
A. Welding at very low temperature
B. Welding using ultrasonic waves
C. Welding under water
D. Welding at very low temperature
19.What is the other name for ultrasonic flaw detector?
A. Destructive testing
B. Magnetostrictive testing
C. Non-destructive testing
D. Destructive testing
20.An ultrasound pulse sent by a source in sea is reflected by a submerged target at a distance 597.50m and reaches the source after 0.83seconds. Find the velocity of sound in sea water.
A. 495.925m/s
B. 719.879m/s
C. 110m/s
D. 495.925m/s
21.Which of the following were one of the conclusions of the Michaelson Morley experiment?
A. All laws of physics remain invariant in all inertial frames
B. Light propagates with different speeds in different directions
C. Ether has no observable properties
D. All laws of physics remain invariant in all inertial frames
22.The device used in the Michaelson Morley experiment was?
A. Telescope
B. Plain Grating
C. Interferometer
D. Telescope
23.How much shift was expected in Michaelson-Morley experiment?
A. 0.01
B. 0.02
C. 0.03
D. 0.01
24.The fringes of equal inclination produced by using Michaelson Interferometer are called as?
A. Equi-inclination Fringes
B. Michaelson’s Fringes
C. Haidinger’s Fringes
D. Equi-inclination Fringes
25.When the movable mirror of a Michaelson Interferometer is shifted through 0.0589 mm, 200 fringes cross the field. What is the wavelength of the light?
A. 5890 â„«
B. 5245 â„«
C. 4965 â„«
D. 5890 â„«
26.In Michaelson interferometer, the position of mirror read 0.6025mm and 0.8970mm for a pair of consecutive bright. Mean wavelength of light is 5393 â„«. The difference between the two wavelengths is?
A. 3 â„«
B. 4 â„«
C. 5 â„«
D. 3 â„«
27.As an object approaches the speed of light, it’s mass becomes?
A. Zero
B. Double
C. Remains Same
D. Zero
28.If the sun radiates energy at the rate of 4 x 1026 Js-1, what is the rate at which its mass is decreasing?
A. 5.54 x 109 kgs-1
B. 4.44 x 109 kgs-1
C. 3.44 x 109 kgs-1
D. 5.54 x 109 kgs-1
29.According to Einstein’s Special Theory of Relativity, laws of physics can be formulated based on?
A. Inertial Frame of Reference
B. Non-Inertial Frame of Reference
C. Both Inertial and Non-Inertial Frame of Reference
D. Inertial Frame of Reference
30.For Einstein’s relation, E2 – p2c2 =?
A. moc2
B. mo2c4
C. moc4
D. moc2
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