CBSE Class 11 Physics Waves Quiz 2

1. Four wires of identical lengths, diameters and material and stretched on a sonometer box. The ratio of their tension is 1 : 4 : 9 : 16. the ratio of their fundamental frequencies is

A 1 : 6 : 9 : 16 B 4 : 3 : 2 : 1 C 1 : 2 : 3 : 4 D 1 : 4 : 9 : 16

2. The equation of wave traveling along string is y = 3 cos p (100t - x) in C.G.S. unit then wavelength is

A 1 m B 2 cm C 5 cm D None of above

3. A resonating column of air contains

A Stationary longitudinal waves B Stationary transverse waves C Transverse progressive waves D Longitudinal progressive waves

4. A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer in Hz is

A 409 B 429 C 517 D 500

5. When a compression is incident on rigid wall it is reflected as

A Compression with a phase change of p B Compression with no phase change C Rarefaction with a phase change of p D Rarefaction with no phase change

6. To demonstrate the phenomenon of beats we need

A Two sources which emit radiation of nearly the same frequency B Two sources which emit radiation of exactly the same frequency C Two sources which emit radiation of exactly the same frequency and have a definite phase relationship D Two sources which emit radiation of exactly the same wavelength

7. Transverse are generated in two uniform wires A and B by attaching their free ends to a vibrating source of frequency 600 Hz. The diameter of wire A is one-third that of wire B and tension in the wire A is double that in wire B. What is the ratio of velocities of waves of waves in wire A and B?

A √3 : 2 B 2 : √3 C 3 : √2 D √2 : 3

8. The extension in a string, obeying Hookes law is X. The speed of sound in the stretched string is V. If the extension in the string is increased to 1.5 X, the speed of sound will be

A 1.22 V B 0.61 V C 1.50 V D 0.75 V

9. String is in fundamental mode of vibration then velocity is directly proportional to _______

A Square root of tension B Square root of length C Square of tension D Square root of linear density

10. With the increase in temperature, the frequency of the sound from an organ pipe

A Decreases B Increases C Remain unchanged D Changes erratically