Waves Test

Result

Waves Test - 83

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Weekly Quiz Competition

Question 1
4 / -1

A stretched wire of length 110 cm is divided into three segments whose frequencies are in ratio 1 : 2 : 3. Their lengths must be

A
20 cm ; 30 cm; 60 cm

B
60 cm; 30 cm; 20 cm

C
60 cm ; 20 cm ; 30 cm

D
30 cm ; 60 cm; 20 cm

Solution
Question 2
4 / -1

Unlike a laboratory sonometer, a stringed instrument is seldom plucked in the middle. Supposing a sitar string is plucked at about 1/4 th of its length from the end. The most prominent harmonic would be

A
Eighth

B
Fourth

C
Third

D
Second
Question 3
4 / -1

If n₁, n₂, n₃ are the frequencies of segments of a stretched string, the frequency n of the string is given by

A

B

C

D
None of the above
Question 4
4 / -1

A
6 cm

B
4 cm

C
3 cm

D
1.5 cm

Solution
Question 5
4 / -1

An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at 50 km/h, and the enemy submarine at 70 km/h. The Indian sub sends out a sonar signal (sound wave in water) at 1000 Hz. Sonar waves travel at 5500 km/h. What is the frequency detected by the Indian submarine

A
1.04 kHz

B
2 kHz

C
2.5 kHz

D
4.7 kHz

Solution
Question 6
4 / -1

Two trains, one coming towards and another going away from an observer both at 4 m/s produce whistle simultaneously of frequency 300 Hz. Find the number of beats produced

A
5

B
6

C
7

D
12

Solution
Question 7
4 / -1

A source of sound emits 400 πW power which is uniformly distributed over a sphere of 10 m radius. What is the loudness of sound on the surface of a sphere?

A
200 dB

B
200 π dB

C
120 dB

D
120 π dB

Solution
Question 8
4 / -1

In the 3rd overtone of an open organ pipe, there are (N-stands for nodes and A -for antinodes)

A
2N, 3A

B
3N, 4A

C
4N, 5A

D
5N, 4A
Question 9
4 / -1

A sine wave has an amplitude A and wavelength λ. Let V be the wave velocity and v be the maximum velocity of a particle in the medium. Then

A

B

C

D
V cannot be equal to v

Solution
Question 10
4 / -1

A

B

C

D
2

Solution