Waves Test

Result

Waves Test - 35

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Weekly Quiz Competition

Question 1
4 / -1

In a longitudinal wave, pressure variation and displacement variation are………

A
In phase

B
90^o out of phase

C
45^o out of phase

D
180^o out of phase
Question 2
4 / -1

A tuning fork of frequency 480 Hz produces 10 beats/s when sounded with a vibrating sonometer string. What must have been the frequency of the string if a slight increase in tension produces fewer beats per second than before?

A
480 Hz

B
490 Hz

C
460 Hz

D
470 Hz
Question 3
4 / -1

Which of the following functions represents a wave?

A

B

C

D
Question 4
4 / -1

Two sound waves are represented by y = aSin(ωt - kx) and y = aCos(ωt - kx). The phase difference between the waves in water is ……..

A

B

C

D
Question 5
4 / -1

A string of linear density 0.2 kg/m is stretched with a force of 500 N. A transverse wave of length 4.0 m and amplitude 1/l meter is travelling along the string. The speed of the wave is …….. m/s.

A
50

B
62.5

C
2500

D
12.5

Solution
Question 6
4 / -1

Two wires made up of same material are of equal lengths but their radii are in the ratio 1 : 2. On stretching each of these two strings by the same tension, the ratio between their fundamental frequency is ……..

A
1 : 2

B
2 : 1

C
1 : 4

D
4 : 1

Solution
Question 7
4 / -1

The tension in a wire is decreased by 19%, then the percentage decrease in frequency will be ………

A
19%

B
10%

C
0.19%

D
None of these

Solution
Question 8
4 / -1

An open organ pipe has fundamental frequency 100 Hz. What frequency will be produced if its one end is closed?

A
100, 200, 300, ….

B
50, 150, 250….

C
50, 100, 200, 300…

D
50, 100, 150, 200,…..

Solution
Question 9
4 / -1

A closed organ pipe has fundamental frequency 100 Hz. What frequencies will be produced if its other end is also opened?

A
200, 400, 600, 800,…..

B
200, 300, 400, 500, …..

C
100, 300, 500, 700,……

D
100, 200, 300, 400, …….
Question 10
4 / -1

A column of air of length 50 cm resonates with a stretched string of length 40 cm. The length of the same air column which will resonate with 60 cm of the same string at the same tension is ……..

A
100 cm

B
75 cm

C
50 cm

D
25 cm

Solution