Waves Test

Result

Waves Test - 34

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Weekly Quiz Competition

Question 1
4 / -1

Two sitar strings A and B playing the note “Dha” are slightly out of time and produce beats of frequency 5 hz. The tension of the string B is slightly increased and the beat frequency is found to decrease to 3 hz. What is the original frequency of B if the frequency of A is 427 hz?

A
432

B
422

C
437

D
417
Question 2
4 / -1

A rocket is moving at a speed of 130 m/s towards a stationary target. While moving, it emits a wave of frequency 800 Hz. Calculate the frequency of the sound as detected by the target. ( Speed of wave = 330 m/s)

A
1320 Hz

B
2540 Hz

C
1270 Hz

D
660 Hz

Solution
Question 3
4 / -1

Length of a steel wire is 11 m and its mass is 2.2 kg. What should be the tension in the wire so that the speed of a transverse wave in it is equal to the speed of sound in dry air at 20^o C temperature?

A
2.31 × 10⁴ N

B
2.25 × 10⁴ N

C
2.06 × 10⁴ N

D
2.56 × 10⁴ N

Solution
Question 4
4 / -1

A wire stretched between two rigid supports vibrates with a frequency of 45 Hz. If the mass of the wire is 3.5 × 10^–2 kg and its linear mass density is 4.0 × 10^–2 kg/m, what will be the tension in the wire ?

A
212 N

B
236 N

C
248 N

D
254 N

Solution
Question 5
4 / -1

Tube A has both ends open while tube B has one end closed, otherwise they are identical. The ratio of fundamental frequency of tube A and B is ……..

A
1 : 2

B
1 : 4

C
2 : 1

D
4 : 1

Solution
Question 6
4 / -1

A tuning fork arrangement produces 4 beats/second with one fork of frequency 288 Hz. A little wax is applied on the unknown fork and it then produces 2 beats/s. The frequency of the unknown fork is ……….Hz.

A
286

B
292

C
294

D
288
Question 7
4 / -1

When temperature increases, the frequency of a tuning fork…….

A
Increases

B
Decreases

C
remains same

D
Increases or decreases depending on the material
Question 8
4 / -1

A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beats frequency decreases to 2 beats/s when the tension in the piano string is slightly increased. The frequency of the piano string before increase in the tension was ……..Hz.

A
256 + 2

B
256 – 2

C
256 – 5

D
256 + 5

Solution
Question 9
4 / -1

An observer moves towards a stationary source of sound with a velocity one – fifth the velocity of sound. What is the percentage increase in the apparent frequency?

A
5 %

B
20 %

C
Zero

D
0.5 %

Solution
Question 10
4 / -1

The speed of sound in Oxygen ( O₂) at a certain temperature is 460 m/s. The speed of sound in helium at the same temperature will be …….…….ms^–1 . (Assume both gases to be ideal)

A
330

B
460

C
5002

D
None of these

Solution