Waves Test

Result

Waves Test - 45

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

A micro-wave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)

A
10⁶ : 1

B
10⁴ : 1

C
10² : 1

D
10 : 1

Solution
Question 2
4 / -1

A wave has velocity u in medium P and velocity 2u in medium Q. If the wave is incident in medium P at an angle of 30°, then the angle of refraction will be

A
30°

B
45°

C
60°

D
90°

Solution
Question 3
4 / -1

An observer standing near the sea shore observes 54 waves per minute. If the wavelength of the water wave is 10m then the velocity of water wave is

A
540 ms^–1

B
5.4 ms^–1

C
0.184 ms^–1

D
9 ms^–1

Solution
Question 4
4 / -1

If the frequency of human heart beat is 1.25 Hz, the number of heart beats in 1 minute is

A
80

B
65

C
90

D
75

Solution
Question 5
4 / -1

The speed of sound in a gas of density ρ at a pressure P is proportional to

A

B

C

D

Solution
Question 6
4 / -1

A progressive wave y = A sin (kx – ωt) is reflected by a rigid wall at x = 0. Then the reflected wave can be represented by

A
y = A sin (kx + ωt)

B
y = A cos (kx + ωt)

C
y = – A sin (kx – ωt)

D
y = – A sin (kx + ωt)

Solution
Question 7
4 / -1

A
4 cm

B
8 cm

C
25 cm

D
12.5 cm

Solution
Question 8
4 / -1

A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 sec and

A
The wavelength is 5 m

B
The frequency is 5 Hz

C
The velocity of propagation is 5 m/s

D
The wavelength is 0.2 m

Solution
Question 9
4 / -1

A
10 sec^–1

B
2 sec^–1

C
1 sec^–1

D
0.01 sec^–1

Solution
Question 10
4 / -1

A wave travelling along the x-axis is described by the equation y (x, t) = 0.005 cos (α x – βt). If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then α and β in appropriate units are

A

B

C

D

Solution