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Home » General Knowledge » Physics Mcqs » Aptitude Test - 14
1.A travelling wave in a stretched string is described by the equation y = Asin(kx-ωt). The maximum particle velocity is?
A. Aω
B. ω/k
C. dω/dk
D. Aω
2.A wave represented by the equation y=acos(kx-ωt) is superposed with another wave to form a stationary wave such that point x=0 is a node. The equation for the other wave is?
A. acos(kx-ωt)
B. -acos(kx-ωt)
C. -acos(kx+ωt)
D. acos(kx-ωt)
3.A whistle giving out 450Hz approaches a stationary observer at a speed of 33m/s. The frequency heard by the observer in Hz is (speed of sound = 330m/s).
A. 409
B. 429
C. 517
D. 409
4.The displacement of particles in a string stretched in the x-direction is represented by y. Among the following expressions for y, those describing wave motion are?
A. coskxsinωt
B. k2 ω2-ω2 t2
C. cos2 (kx+ωt)
D. coskxsinωt
5.A tube closed at one end and containing air produces, when excited, the fundamental note of frequency 512Hz. If the tube is open at both ends, the fundamental frequency that can be excited is (in Hz).
A. 1024
B. 512
C. 256
D. 1024
6.A wave y=asin(ωt-kx), on a string meets with another wave producing a node at x = 0. Then, the equation of the unknown wave is?
A. y=asin⁡(ωt+kx)
B. y=-asin⁡(ωt+kx)
C. y=asin⁡(ωt-kx)
D. y=asin⁡(ωt+kx)
7.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
8.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
9.A sound absorber attenuates the sound level by 20dB. The intensity decreases by a factor of?
A. 100
B. 1000
C. 10000
D. 100
10.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
11. 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
12.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
13.The quantity which does not change, when sound enters from one medium to another?
A. Wavelength
B. Speed
C. Frequency
D. Wavelength
14.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
15.y1=4sin⁡(ωt+kx), y2=-4cos⁡(ωt+kx), the phase difference is?
A. π/2
B. 3π/2
C. π
D. π/2
16. A wave equation is y=0.1sin[100πt-kx] and wave velocity is 100m/s, its number is equal to?
A. 1/m
B. 2/m
C. π/m
D. 1/m
17.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
18. 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
19.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
20.Which of the following effects can be used to produce ultrasonic waves?
A. Magnetostriction effect
B. Doppler Effect
C. Magnetic effect
D. Magnetostriction effect
21.When is ultrasonic waves produced using piezo electric oscillator?
A. At constant temperature
B. At resonance
C. At constant pressure
D. At constant temperature
22.Which of the following causes acoustical grating?
A. Magnetic waves
B. Electric waves
C. Magnetostriction effect
D. Magnetic waves
23.What is the principle for measurement of the velocity of ultrasonic waves?
A. Magnetostriction effect
B. Acoustical grating
C. Doppler Effect
D. Magnetostriction effect
24.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
25.What is the other name for ultrasonic flaw detector?
A. Destructive testing
B. Magnetostrictive testing
C. Non-destructive testing
D. Destructive testing
26.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
27.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
28.The device used in the Michaelson Morley experiment was?
A. Telescope
B. Plain Grating
C. Interferometer
D. Telescope
29.How much shift was expected in Michaelson-Morley experiment?
A. 0.01
B. 0.02
C. 0.03
D. 0.01
30.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
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