A string of length L and mass M hangs freely from a fixed point. Then the velocity of transverse waves along the string at a distance x from the free end is

1. gL

2. gx

3. gL

4. gx

Subtopic:  Travelling Wave on String |
 79%
From NCERT
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Three waves of equal frequency having amplitudes of 10 μm, 4 μm and 7 μm arrive at a given point with a successive phase difference of π2. The amplitude of the resulting wave in μm is given by:
1. 7
2. 6
3. 5
4. 4

Subtopic:  Standing Waves |
 59%
From NCERT
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An organ pipe that is closed at one end has a fundamental frequency of 1500 Hz. The maximum number of overtones generated by this pipe that a normal person can hear is: 

1. 14 2. 13
3. 6 4. 9
Subtopic:  Standing Waves |
 59%
From NCERT
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Two pulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will be 

1. Zero

2. Purely kinetic

3. Purely potential

4. Partly kinetic and partly potential

Subtopic:  Energy of Waves |
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The diagram below shows the propagation of a wave. Which points are in the same phase :

(1) F, G

(2) C and E

(3) B and G

(4) B and F

Subtopic:  Wave Motion |
 70%
From NCERT
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The correct graph between the frequency n and square root of density (ρ) of wire, keeping its length, radius and tension constant, is :

(1)

(2)

(3)

(4)

Subtopic:  Pressure Wave in Sound |
 72%
From NCERT
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If the speed of the wave shown in the figure is 330m/s in the given medium, then the equation of the wave propagating in the positive x-direction will be (all quantities are in M.K.S. units) :

(1) y=0.05sin2π(4000t12.5x)

(2) y=0.05sin2π(4000t122.5x)

(3) y=0.05sin2π(3300t10x)

(4) y=0.05sin2π(3300x10t)

Subtopic:  Wave Motion |
 70%
From NCERT
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The displacement-time graphs for two sound waves A and B are shown in the figure, then the ratio of their intensities IA/IB is equal to :

1. 1 : 4

2. 1 : 16

3. 1 : 2

4. 1 : 1

Subtopic:  Energy of Waves |
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A wave motion has the function y=a0sin(ωtkx). The graph in figure shows how the displacement y at a fixed point varies with time t. Which one of the labeled points shows a displacement equal to that at the position x=π2k at time t = 0

(1) P

(2) Q

(3) R

(4) S

Subtopic:  Wave Motion |
 60%
From NCERT
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Two loudspeakers L1 and L2 driven by a common oscillator and amplifier, are arranged as shown. The frequency of the oscillator is gradually increased from zero and the detector at D records a series of maxima and minima. If the speed of sound is 330 ms–1 then the frequency at which the first maximum is observed is

(1) 165 Hz

(2) 330 Hz

(3) 496 Hz

(4) 660 Hz

Subtopic:  Doppler's Effect (OLD NCERT) |
 63%
From NCERT
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