Waves Test

Result

Waves Test - 58

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Weekly Quiz Competition

Question 1
4 / -1

Frequency of a sonometer wire is n. Now its tension is increased 4 times and its length is doubled then new frequency will be

A
n/2

B
4n

C
2n

D
n

Solution
Question 2
4 / -1

A device used for investigating the vibration of a fixed string or wire is

A
Sonometer

B
Barometer

C
Hydrometer

D
None of these
Question 3
4 / -1

To increase the frequency from 100 Hz to 400 Hz the tension in the string has to be changed by

A
4 times

B
16 times

C
20 times

D
None of these

Solution
Question 4
4 / -1

A second harmonic has to be generated in a string of length l stretched between two rigid supports. The point where the string has to be plucked and touched are

A

B

C

D

Solution
Question 5
4 / -1

Transverse waves of same frequency are generated in two steel wires A and B. The diameter of A is twice of B and the tension in A is half that in B. The ratio of velocities of wave in A and B is

A

B

C
1 : 2

D

Solution
Question 6
4 / -1

A sonometer wire resonates with a given tuning fork forming standing waves with five antinodes between the two bridges when a mass of 9 kg is suspended from the wire. When this mass is replaced by a mass M, the wire resonates with the same tuning fork forming three antinodes for the same positions of the bridges. The value of M is

A
25 kg

B
5 kg

C
12.5 kg

D
1/25 kg

Solution
Question 7
4 / -1

The tension of a stretched string is increased by 69%. In order to keep its frequency of vibration constant, its length must be increased by

A
20%

B
30%

C
√69%

D
69%

Solution
Question 8
4 / -1

The length of a sonometer wire tuned to a frequency of 250 Hz is 0.60 metre. The frequency of tuning fork with which the vibrating wire will be in tune when the length is made 0.40 metre is

A
250 Hz

B
375 Hz

C
256 Hz

D
384 Hz

Solution
Question 9
4 / -1

Length of a string tied to two rigid supports is 40 cm. Maximum length (wavelength in cm) of a stationary wave produced on it is

A
20

B
80

C
40

D
120

Solution
Question 10
4 / -1

Two wires are in unison. If the tension in one of the wires is increased by 2%, 5 beats are produced per second. The initial frequency of each wire is

A
200 Hz

B
400 Hz

C
500 Hz

D
1000 Hz

Solution