Waves Test

Result

Waves Test - 50

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Weekly Quiz Competition

Question 1
4 / -1

If two waves of same frequency and same amplitude respectively, on superimposition produced a resultant disturbance of the same amplitude, the waves differ in phase by

A
π

B
2π/3

C
π/2

D
Zero

Solution
Question 2
4 / -1

A stationary point source of sound emits sound uniformly in all directions in a non-absorbing medium. Two points P and Q are at a distance of 4 m and 9 m respectively from the source. The ratio of amplitudes of the waves at P and Q is

A
3/2

B
4/9

C
2/3

D
9/4

Solution
Question 3
4 / -1

Two waves are propagating to the point P along a straight line produced by two sources A and B of simple harmonic and of equal frequency. The amplitude of every wave at P is \'a\' and the phase of A is ahead by π/3 than that of B and the distance AP is greater than BP by 50 cm. Then the resultant amplitude at the point P will be, if the wavelength is 1 meter

A
2a

B

C

D
a

Solution
Question 4
4 / -1

Coherent sources are characterized by the same

A
Phase and phase velocity

B
Wavelength, amplitude and phase velocity

C
Wavelength, amplitude and frequency

D
Wavelength and phase

Solution
Question 5
4 / -1

The minimum intensity of sound is zero at a point due to two sources of nearly equal frequencies, when

A
Two sources are vibrating in opposite phase

B
The amplitude of two sources are equal

C
At the point of observation, the amplitudes of two S.H.M. produced by two sources are equal and both the S.H.M. are along the same straight line

D
Both the sources are in the same phase

Solution
Question 6
4 / -1

A
0.7 cm

B
0.1 cm

C
0.5 cm

D

Solution
Question 7
4 / -1

If two waves having amplitudes 2A and A and same frequency and velocity, propagate in the same direction in the same phase, the resulting amplitude will be

A
3A

B

C

D
A

Solution
Question 8
4 / -1

Out of the given four waves (1), (2), (3) and (4)
y = a sin (kx + ωt) ... (1)
y = a sin (ωt – kx) ... (2)
y = a cos (kx + ωt) ... (3)
y = a cos (ωt – kx) ... (4)
emitted by four different sources S₁, S₂, S₃, and S₄ respectively, interference phenomena would be observed in space under appropriate conditions when

A
Source S₁ emits wave (1) and S₂ emits wave (2)

B
Source S₃ emits wave (3) and S₄ emits wave (4)

C
Source S₂ emits wave (2) and S₄ emits wave (4)

D
Source S₄ emits wave (4) and S₃ emits wave (3)

Solution
Question 9
4 / -1

Two waves of same frequency and intensity superimpose with each other in opposite phases, then after superposition the

A
Intensity increases by 4 times

B
Intensity increases by two times

C
Frequency increases by 4 times

D
None of the above

Solution
Question 10
4 / -1

The superposing waves are represented by the following equations :
y₁ = 5 sin 2π(10t – 0.1x), y₂ = 10 sin 2π(20t – 0.2x)
Ratio of intensities I_max / I_min will be

A
1

B
9

C
4

D
16