CSIR Net Physics Previous Year Question Papers. We covered all the CSIR Net Physics Previous Year Question Papers in this post for free so that you can practice well for the exam.
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CSIR Net Physics Previous Year Question Papers Mock Test for Students
The frequency of an open organ pipe at 15 °C is 156 Hz. At what temperature will its frequency become 160 Hz?
(A) 30 °C
(B) 50 °C
(C) 70 °C
(D) 90 °C
Option a – 30 °C
A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of the air column in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s :
(A) 6
(B) 4
(C) 12
(D) 8
Option a – 6
The number of possible natural oscillations of an air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are (velocity of sound in air = 340 m/s) :
(A) 4
(B) 5
(C) 7
(D) 6
Option d – 6
5 beats per second are produced by vibrating two closed organ pipes simultaneously. If the ratio of their lengths is 21/20. then their frequencies will be :
(A) 100 Hz and 105 Hz
(B) 105 Hz and 100 Hz
(C) 110 Hz and 105 Hz
(D) 105 Hz and 110 Hz
Option a – 100 Hz and 105 Hz
A tuning fork of frequency 340 Hz is vibrated at the open end of a tube 150 cm high. Water is slowly filled into the tube. If the speed of sound in air is 340 m/s then the minimum height of water in the tube necessary for resonance will be :
(A) 25 cm
(B) 45 cm
(C) 75 cm
(D) 95 cm
Option a – 25 cm
On vibrating an air column at 27 °C and a tuning fork simultaneously, 5 beats/second are produced. The frequency of the fork is less than that of the air column. No beats are heard at -3 °C. The frequency of the fork is :
(A) 70 Hz
(B) 92 Hz
(C) 104 Hz
(D) 147 Hz
Option b – 92 Hz
The level of water can be adjusted at any point in a 1.1 m long glass tube. A tuning fork of frequency 660 Hz is vibrated at the open end of the tube. If the velocity of sound is 330 m/s then the maximum number of harmonics produced in the tube will be :
(A) 2
(B) 3
(C) 4
(D) 5
Option c – 4
We covered all the csir net physics previous year question papers above in this post for free so that you can practice well for the exam.
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