Waves Test

Result

Waves Test - 5

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Weekly Quiz Competition

Question 1
4 / -1

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is

A
9 : 4

B
2 : 3

C
3 : 2

D
4 : 9
Question 2
4 / -1

A
5

B
5√3

C
10√3

D
10

Solution
Question 3
4 / -1

Sound waves transfer

A
only energy not momentum

B
energy

C
momentum

D
Both (a) and (b)
Question 4
4 / -1

If the speed of a wave doubles as it passes from shallow water into deeper water, its wavelength will be

A
unchanged

B
halved

C
doubled

D
quadrupled
Question 5
4 / -1

The angle between particle velocity and wave velocity in a transverse wave is

A
zero

B
π/4

C
π/2

D
π

Solution
Question 6
4 / -1

A boat at anchor is rocked by waves whose crests are 100 m apart and velocity is 25 ms^-1. The boat bounces up once in every

A
2500 s

B
75 s

C
4 s

D
0.25 s
Question 7
4 / -1

A
A node occurs at x = 0.15 m

B
An antinode occurs at x = 0.3 m

C
The speed wave is 5 ms^–1

D
The wave length is 0.3 m
Question 8
4 / -1

Compressional wave pulses are sent to the bottom of sea from a ship and the echo is heard after 2 s. If bulk modulus of elasticity of water is 2 × 10⁹ Nm^-2 and mean temperature is 4°C, then the depth of the sea will be

A
1014 m

B
1414 m

C
2828 m

D
1825 m
Question 9
4 / -1

At a certain instant, a stationary transverse wave is found to have maximum kinetic energy. The appearance of string at that instant is

A
sinusoidal shape with amplitude a/3

B
sinusoidal shape with amplitude a/2

C
sinusoidal shape with amplitude a

D
straight line
Question 10
4 / -1

If sound wave travel from air to water, which of the following remains unchanged?

A
Velocity

B
Wavelength

C
Requency

D
Intensity