The document Previous year questions (2014-19) - Waves NEET Notes | EduRev is a part of the NEET Course Physics 28 Years Past year papers for NEET/AIPMT Class 11.

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**Q 1. A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27Â°C two successive resonances are produced at 20 cm and 73 cm column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27Â°C is:- [2018]A: 330 m/sB: 339 m/sC: 350 m/sD: 300 m/sAns: BSolution**:

**Q 2. The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20cm, the length of the open organ pipe is:- [2018]A: 13.2 cmB: 8 cmC: 12.5 cmD: 16 cmAns:** A

A: 20 Hz

B: 30 Hz

C: 40 Hz

D: 10 Hz

Ans:

Two successive frequencies of closed pipe

A: 361 Hz

B: 411 Hz

C: 448 Hz

D: 350 Hz

Ans:

A: 885Hz

B: 765 Hz

C: 800 Hz

D: 838 Hz

Ans:

Solution:

Since the observer and the wall are stationary so frequency of echo observed by the observer will also be 838 Hz.

A: 200 cm

B: 66.7 cm

C: 100 cm

D: 150 cm

Ans:

The smallest length of the air column is associated with the fundamental mode of vibration of the air column.

The next higher length of the air column is,

**Q 7. A uniform rope of length L and mass m _{1} hangs vertically from a rigid support. A block of mass m_{2} is attached to the free end of the rope. A transverse pulse of wavelength Î»1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is Î»_{2}. The ratio Î»_{1}/Î»_{2} is : [2016]** C

A:

B:

C:

D:

Ans:

A: 140 cm

B: 80 cm

C: 100 cm

D: 120 cm

Ans:

For closed organ pipe fundamental frequency

For open organ pipe fundamental frequency

**Q 9. If n _{1}, n_{2}, and n_{3} are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by: [2014]**

A:

C: D

Solution:

**Q 10. The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are : (velocity of sound = 340 ms ^{âˆ’1}) [2014]A: 7B: 6C: 4D: 5Ans: BSolution:**

**Q 11. A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be: [2014]A: 1412 HzB: 1454 HzC: 1332 HzD: 1372 HzAns:** A

Solu

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