Waves Test

Result

Waves Test - 66

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Weekly Quiz Competition

Question 1
4 / -1

An observer is moving towards the stationary source of sound, then

A
Apparent frequency will be less than the real frequency

B
Apparent frequency will be greater than the real frequency

C
Apparent frequency will be equal to real frequency

D
Only the quality of sound will change

Solution
Question 2
4 / -1

A person feels 2.5% difference of frequency of a motor-car horn. If the motor-car is moving to the person and the velocity of sound is 320 m/sec, then the velocity of car will be

A
8 m/s (approx.)

B
800 m/s

C
7 m/s

D
6 m/s (approx.)

Solution
Question 3
4 / -1

Two passenger trains moving with a speed of 108 km/hour cross each other. One of them blows a whistle whose frequency is 750 Hz. If sound speed is 330 m/s, then passengers sitting in the other train, after trains cross each other will hear sound whose frequency will be

A
900 Hz

B
625 Hz

C
750 Hz

D
800 Hz

Solution
Question 4
4 / -1

With what velocity an observer should move relative to a stationary source so that he hears a sound of double the frequency of source?

A
Velocity of sound towards the source

B
Velocity of sound away from the source

C
Half the velocity of sound towards the source

D
Double the velocity of sound towards the source

Solution
Question 5
4 / -1

A source of sound emitting a note of frequency 200 Hz moves towards an observer with a velocity v equal to the velocity of sound. If the observer also moves away from the source with the same velocity v, the apparent frequency heard by the observer is

A
50 Hz

B
100 Hz

C
150 Hz

D
200 Hz
Question 6
4 / -1

Doppler phenomena is related with

A
Pitch (Frequency)

B
Loudness

C
Quality

D
Reflection
Question 7
4 / -1

A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is of three times the original frequency. The velocity of sound is v m/sec. The speed of source will be

A

B

C

D

Solution
Question 8
4 / -1

Two trains, each moving with a velocity of 30 ms^–1 , cross each other. One of the train gives a whistle whose frequency is 600 Hz. If the speed of sound is 330 ms^–1, the apparent frequency for passengers sitting in the other train before crossing would be

A
600 Hz

B
630 Hz

C
920 Hz

D
720 Hz

Solution
Question 9
4 / -1

A train is moving at 30 ms^–1 in still air. The frequency of the locomotive whistle is 500 Hz and the speed of sound is 345 ms^–1. The apparent wavelength of sound in front of and behind the locomotive are respectively

A
0.80 m, 0.63 m

B
0.63 m, 0.80 m

C
0.50 m, 0.85 m

D
0.63 m, 0.75 m

Solution
Question 10
4 / -1

The Doppler\'s effect is applicable for

A
Light waves

B
Sound waves

C
Space waves

D
Both (a) and (b)