Q.1.
in stationary wave .. [ BHU 1995]
-
67%
a) strain is maximum at nodes
-
33%
b) strain is maximum at anti nodes
-
0%
c)strain is minimum at nodes
-
0%
d)Amplitude is zero at all points
Q.2.
The resultant amplitude of two waves y1=a sin[ωt+(π/6)] and y2=a cosωt will be [ raj.PMT 1996]
-
0%
a) a
-
67%
b) a√2
-
33%
c) a√3
-
0%
d) 2a
Explanation
Q.3.
two sources of nearly same frequency give beats. Which of the following statements is correct?
-
0%
a)The frequency of beats depends on the position of the observer
-
33%
b) The frequency of beats changes with time
-
33%
c)The amplitude of vibration at any point changes with frequency of the two individual sources
-
33%
d)The amplitude of vibration at any point changes with frequency equal to the difference in the frequency of the two individual sources
Q.4.
Fifty six tuning forks are arranged in a series such that each fork gives six beats per second with the previous one. Assuming the frequency of the last fork to be double of the first, the frequency of the last fork should be [ AMU 1995]
-
0%
a) 440Hz
-
50%
b) 660Hz
-
50%
c)330Hz
-
0%
d)220Hz
Q.5.
A wave of frequency 100Hz is sent along a string towards a fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10cm from the fixed end of the string. The speeds of incident ( and reflected) wave are.. [ CBSE 1994}
-
0%
a) 40 m/s
-
33%
b) 20 m/s
-
67%
c)10 m/s
-
0%
d)5 m/s
Q.6.
There are three sources of sound of equal intensity and with frequencies 500, 502, 500 Hz respectively. The number of beats heard per second is .. [ ISM Dhanbad 1994]
-
0%
a) 4
-
67%
b) 2
-
33%
c) 0
-
0%
d) 3
Q.7.
Two tuning forks of frequencies 256 and 258 vibrations/second are sounded together. Then the time interval between two consecutive maxima heard by an observer is ..[ MPPMT 1988]
-
33%
a)2 second
-
0%
b) 0.5 second
-
33%
c)250 second
-
33%
d)252 second
Q.8.
A vibrating tuning fork of frequency n is placed near the open end of long cylindrical tube. the tube has a side opening and is fitted with a movable reflecting piston. As the piston is moved through 8.75cm, the intensity of sound changes from a maximum to minimum. If the speed of sound is 350 metre per second, then n is
-
0%
a) 500Hz
-
33%
b) 600Hz
-
67%
c)1000Hz
-
0%
d)2000Hz
Q.9.
in a resonance column, the first resonance is obtained when the level of water in the tube is at 16 cm from the open end. the next resonance point will be obtained, when the level of water from the open end is
-
0%
a) 32 cm
-
33%
b) 48 cm
-
33%
c)64 cm
-
33%
d)24 cm
Q.10.
A sound source of frequency 170 Hz is placed near a wall. A man walking from the source towards the wall finds that there is a periodic rise and fall of sound intensity. if the speed of sound in air is 340 m/s the distance separating the two adjacent positions of minimum intensity is .. [ MNR 1992]
-
0%
a) 0.5
-
67%
b) 1
-
0%
c) 3/2
-
33%
d) 2
Q.11.
In stationary waves all particles between two nodes pass through the mean position .. [ MPPMT 1999]
-
0%
a)At different times with different velocities
-
0%
b) At different time with the same velocities
-
0%
c)At the same time with equal velocity
-
100%
d)At the same time with different velocities
Q.12.
Two sound waves of relative intensities 400:1 show interference. the ratio of intensity at the maxima to minima is close to ..[ CPMT 1989]
-
50%
a) 11/9
-
0%
b) 401/399
-
0%
c)21/19
-
50%
d)√ (40/399)
Explanation
Q.13.
Stationary waves are formed when
-
0%
a) Two waves of equal amplitude and equal frequency travel along the same path in opposite directions
-
50%
b) Two waves of equal wavelengths and amplitude travel along the same path with equal speeds in opposite directions
-
50%
c)Two waves of equal wavelengths and equal phase travel along the same path with same speed
-
0%
d)Two waves of equal amplitude and speed travel along the same path in opposite direction
Q.14.
A wave represented by y=acos(kx-vt) is superimposed with another wave to produce stationary waves, such that x=0 is a node. The equation of the other wave is [ BHU 1998]
-
0%
a) y=a sin(kx+vt)
-
0%
b) y=-acos(kx-vt)
-
67%
c) y=-acos(kx+vt)
-
33%
d) y=-asin(kx-vt)
Q.15.
The composition of two simple harmonic motions of equal periods at right angles to each other and with a phase difference of π results in the displacement of the particle along [ CBSE 1990]
-
50%
a)straight line
-
0%
b) circle
-
0%
c)Ellipse
-
50%
d)Figure of eight
Q.16.
The equation represents .. [ MNR 1994]
-
0%
a) transverse progressive wave
-
33%
b) longitudinal progressive wave
-
67%
c)longitudinal stationary wave
-
0%
d)transverse stationary wave
Q.17.
Stationary waves are set up in air column, velocity of sound in air is 330 m/s and frequency is 165Hz. Then distance between the nodes is .. [ EAMCET 1995]
-
33%
a) 2 m
-
33%
b) 1 m
-
33%
c)0.5 m
-
0%
d)4 m
Q.18.
Two simple harmonic motions A and B are represented by y1=a sin ( ωt + π/6)y2=a sin(ωt + 3π/6) The maximum displacement of A will be .. [APPMT 1988]
-
0%
a) At the same time as for B
-
0%
b) Earlier than that for B by T/6 second
-
50%
c)Later that for B by T/6 seconds
-
50%
d)Later than that for B by T/3 second
Q.19.
A stretched string is vibrating according to the equation y=5sin(πx/2)cos40πt, where y and x are in cm and t in seconds. the distance between to consecutive nodes on the string is .. [ MPPET 1999]
-
0%
a) 5 cm
-
0%
b) 4 cm
-
50%
c) 3 cm
-
50%
d) 2 cm
Q.20.
Stationary waves are produced in medium. Which of the following statement is correct?
-
0%
a)Rarefactions occur at antinodes
-
0%
b) Condensations occur at anodes
-
0%
c)Strain at antinodes is zero
-
100%
d)Strain at antinode is maximum
Q.21.
The equation of plane progressive wave is y=0.09sin8π(t-x/20). When it is reflected at a rigid support, its amplitude becomes 2/3 rd of its previous value. The equation of the reflected wave is :
-
33%
a)
-
33%
b)
-
33%
c)
-
0%
d)
Explanation
Q.22.
If two waves of the same frequency and same amplitude respectively, on superimposition produce a resultant disturbance of the same amplitude. The waves differ in phase by [ MPPMT 1990]
-
0%
a) π
-
0%
b) 2π/3
-
50%
c) π/3
-
50%
d)zero
Explanation
Q.23.
Two vibrating tuning forks produce progressive waves given by y1=4sin(500πt) and y2=2sin(506πt) are held near the ear of a person. if the number of beats heard per second be b and the ratio of maximum to minimum intensity be A, then [ CPMT 1988]
-
0%
a) B=3 and A=2
-
0%
b) B=3 and A=9
-
0%
c) B=6 and A=2
-
100%
d) B=6 and A=9
Q.24.
The equation of wave traveling in a string can be be written as y=3cosπ(100t-x). Its wavelength is ..[ MNR 1985]
-
25%
a)100 cm
-
75%
b) 2 cm
-
0%
c)5 cm
-
0%
d)None of the above
Explanation
Q.25.
Transverse waves can propagate .. [ CPMT 1984]
-
0%
a) Both in a gas and a metal
-
0%
b) In a gas but not in a metal
-
0%
c)Not in a gas but in metal
-
100%
d)Neither in a gas nor in metal
Q.26.
The displacement y ( in cm) produced by a simple harmonic wave is given by y=(10/π) sin(2000πt - πx/17) The periodic time and maximum velocity of the particles in the medium will respectively be ... [ CPMT 1986]
-
0%
a)10-3 sec and 340 m/s
-
50%
b) 10-4 and 20 m/s
-
50%
c)10-3 and 200 m/s
-
0%
d)10-2 and 2000,/sec
Q.27.
The velocities of sound of an ideal gas at temperature T1 and T2 K are found to be V1 and V2 respectively. If the root mean square speeds of the same gas at the same temperature T1 and T2 are v1 and v2 respectively then .. [ CPMT 1986]
-
0%
a) v2 / v1=V2 / V1
-
0%
b) v2 / v1=V1 / V2
-
100%
c) v2 / v1=[ (√V2) / V1]
-
0%
d) v2 / v1=[ (√V1) / V2]
Q.28.
A transverse wave is described by the equation Y=Yosin2π(ft- x/λ). The maximum particle velocity is equal to four times the wave velocity if ... [ MPPMT 1998]
-
50%
a)λ=πYo/4
-
0%
b) λ=πYo/2
-
0%
c)λ=πYo
-
50%
d)λ=2πYo
Q.29.
Which of the following properties of sound is affected by change in air temperature ..[ AMU 1995]
-
0%
a) Amplitude
-
0%
b) Frequency
-
50%
c)Wavelength
-
50%
d)Intensity
Q.30.
Ultrasonic waves are used for stirring liquid solution because
-
0%
a) They don not produce noise during the operation
-
0%
b) They are easy to produce
-
50%
c)They can produce perfectly homogeneous solutions
-
50%
d)They do not produce chemical reactions in the solutions