Waves Test

Result

Waves Test - 20

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

When the length of the vibrating segment of a sonometer wire is increased by 1%, the percentage change in its frequency is

A

B

C
1

D
2
Question 2
4 / -1

A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21 A° between them. The wavelength of the standing wave is

A
1.21 A°

B
1.42 A°

C
6.05 A°

D
3.63 A°
Question 3
4 / -1

A

B

C
2

D
Question 4
4 / -1

A string fixed at both ends oscillates in 5 segments, length 10 m and velocity of wave is 20 ms ^-1. What is the frequency?

A
5 Hz

B
15 Hz

C
10 Hz

D
2 Hz
Question 5
4 / -1

A segment of wire vibrates with a fundamental frequency of 450 Hz under a tension of 9 kg–wt. Then, tension at which the fundamental frequency of the same wire becomes 900 Hz is

A
36 kg–wt

B
27 kg–wt

C
18 kg–wt

D
72 kg–wt

Solution
Question 6
4 / -1

A piston fitted in cylindrical pipe is pulled as shown in the figure. A tuning fork is sounded at open end and loudest sound is heard at open length 13 cm, 41 cm and 69 cm, the frequency of tuning fork if velocity of sound is 350 ms^-1 , is

A
1250 Hz

B
625 Hz

C
417 Hz

D
715 Hz
Question 7
4 / -1

In Melde's experiment in the transverse mode, the frequency of the tuning fork and the frequency of the waves in the string are in the ratio

A
2 : 1

B
4 : 1

C
1 : 1

D
1 : 2
Question 8
4 / -1

Two strings A and B of lengths, L_A = 80cm and L_B= x cm respectively are used separately in a sonometer. The ratio of their densities (d A / dB ) is 0.81. The diameter of B is one-half that of A. If the strings have the same tension and fundamental frequency, the value of x is

A
33

B
102

C
144

D
130
Question 9
4 / -1

In an experiment with sonometer a tuning fork of frequency 256 Hz resonates with a length of 25 cm and another tuning fork resonates with a length of 16 cm. Tension of the string remaining constant. The frequency of the second tuning fork is

A
163.84 Hz

B
400 Hz

C
320 Hz

D
204.8 Hz
Question 10
4 / -1

Two closed organ pipe A and B have the same length. A is wider than B. They resonate in the fundamental mode at frequencies v_A and v_B respectively, then

A
v_A = v_B

B
v_A > v_B

C
v_A < v_B

D
either (2) or (3) depending on the ratio of their diameters