MCQ Beats, Class 11 Physics

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Two guitar strings A and B are slightly out of tune and produce beats of frequency 6Hz.The tension of the string found to decrease to 4 Hz. What is the original frequency of B if the frequency of a is 430Hz?

424 Hz

436 Hz

435 Hz

420 Hz

Question 1 of 10

2. When two tuning forks are sounded together 4 beats are heard per second. One tuning fork is of frequency 346 Hz. When its prong is loaded with a little wax, the number of beats is increased to 6 per second. The frequency of the other fork is:

352 Hz

340 Hz

350 Hz

342 Hz

Question 2 of 10

3. What material is tuning fork made of and why?

Iron, ductile

Aluminium, less tensile strength

Elinvar, elasticity of elinvar does not change

Steel, more tensile strength

Question 3 of 10

4. Phenomenon of beats is not used in

Tuning musical instruments

Detecting the presence of dangerous gases in mines

Designing low frequency oscillators

Radars for detecting submarines

Question 4 of 10

5. For the formation of distinct beats, the frequencies of two sources of sound should be

Nearly equal say less than 10

One frequency should be half of other

Of greater variation say 100

Double of each other

Question 5 of 10

6. On adding two sine waves that are exactly the same, what would be the result?

an identical sine wave with half the amplitude

an identical sine wave with double the frequency

an identical sine wave

an identical sine wave with double the amplitude

Question 6 of 10

7. Time interval between two successive maxima of sound waves with frequencies v1and v2 is given by

A

B

C

D

Question 7 of 10

8. Two sound sources fixed at a given distance apart are emitting sound each of wavelength λ. A Listener moves with a velocity v0 along the line joining the two sources , the number of beats heard by him per second is

4v₀/λ

v₀/3λ

v₀/2λ

2v₀/λ

Question 8 of 10

9. Pure sound notes from two sources make the molecules of air at a location vibrate simple harmonically in accordance with the equations.
y₁ = 0.008 sin (604 n t) and
y₂ = 0.007 sin (610 n t) respectively.
The number of beast heard by a person at the location will be:

3

1

2

4

Question 9 of 10

10. Two tuning forks are struck and the sounds from each reach your ears at the same time. One sound has a frequency of 256 Hz, and the second sound has a frequency of 258 Hz. The underlying beat frequency is:

257 Hz

258 Hz

2.0 Hz

256 Hz

Question 10 of 10

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