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Waves

NEET (UG) 2023MCQEasy📈 Topic in 50% papers+4−1
Ques. 1NEET (UG) 2023

The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is

  1. 2:1
  2. 1:3
  3. 3:1
  4. 1:2

Answer

(1) 2:1

Solution

Open pipe: fo = v2L; closed pipe: fc = v4L

fofc = v/2Lv/4L = 21

Answer: (1)

Keep practising — Waves

Ques. 2NEET (UG) 2022

If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is

  1. 1 : 1
  2. 2 : 1
  3. 1 : 2
  4. 1 : 2
Ques. 3NEET (UG) 2022 (Phase 2)

An organ pipe filled with a gas at 27 resonates at 400 Hz in its fundamental mode. If it is filled with the same gas at 90 , the resonance frequency at the same mode will be

  1. 512 Hz
  2. 420 Hz
  3. 440 Hz
  4. 484 Hz
Ques. 4NEET (UG) 2020

In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency increases. If the frequency of A is 530 Hz, the original frequency of B will be :

  1. 524 Hz
  2. 536 Hz
  3. 537 Hz
  4. 523 Hz
Ques. 5NEET 2018

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 27°C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27°C is

  1. 330 m s-1
  2. 339 m s-1
  3. 350 m s-1
  4. 300 m s-1
Ques. 6NEET 2018

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 20 cm, the length of the open organ pipe is

  1. 13.2 cm
  2. 8 cm
  3. 12.5 cm
  4. 16 cm
Ques. 7NEET 2017

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?

  1. 20 Hz
  2. 30 Hz
  3. 40 Hz
  4. 10 Hz
Ques. 8NEET 2017

Two cars moving in opposite directions approach each other with speed of 22 m s-1 and 16.5 m s-1 respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is (velocity of sound is 340 m s-1)

  1. 361 Hz
  2. 411 Hz
  3. 448 Hz
  4. 350 Hz
Out of syllabus
Ques. 9NEET 2016 (Phase 1)

An air column, closed at one end open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is

  1. 150 cm
  2. 200 cm
  3. 66.7 cm
  4. 100 cm
Ques. 10NEET 2016 (Phase 1)

A uniform rope of length L and mass m1 hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the rope. A transverse pulse of wavelength 1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is 2. The ratio 2/ 1 is

  1. m2m1
  2. m1 + m2m1
  3. m1m2
  4. m1 + m2m2
Ques. 11NEET 2016 (Phase 1)

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15 m s-1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330 m s-1)

  1. 838 Hz
  2. 885 Hz
  3. 765 Hz
  4. 800 Hz
Out of syllabus

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