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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 : ( CSIR Net Physics Previous Year QnA )
(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 : ( CSIR Net Physics Previous Year QnA )
(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 : ( CSIR Net Physics Previous Year QnA )
(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
Light transmitted by a single Nicol crystal is ( CSIR Net Physics Previous Year QnA )
1. Unpolarised
2. Elliptically polarised
3. Plane polarised
4. None of above
Option 3 – Plane polarised
Which of the following waves can’t be polarised?
1. Sound waves
2. Gamma rays
3. Radio waves
4. UV-rays
Option 1 – Sound waves
The sugar solution produces the rotation of the plane of polarization towards the right-hand side so the source is ( CSIR Net Physics Previous Year QnA )
1. Laevo-rotatory
2. Polarised
3. Dexto-rotatory
4. Unpolarised
Option 3 – Dexto-rotatory
At the polarising angle, the angle between reflected and refracted ray is
1. 90°
2. 180°
3. 45°
4. 60°
Option 1 – 90°
Two Nicol prisms are oriented with their principal planes making an angle of 30%. Then the percentage of incident unpolarised light which passes through the system is ( CSIR Net Physics Previous Year QnA )
1. 37.5
2. 75
3. 100
4. None of the above
Option 1 – 37.5
For a surface, the polarising angle is 57°. The angle of incidence so that reflected light is plane polarised is
1. 57°
2. 37°
3. 90°
4. 137°
Option 1 – 57°
Light is fall (incident) on a plate at an angle of 60° and the reflected and refracted rays are mutually perpendicular. The refractive index of the plate is ( CSIR Net Physics Previous Year QnA )
1. 1.5
2. 2
3. 1.732
4. None of the above
Option 3 – 1.732
An unpolarised light is incident upon a glass plate of refractive index 1.54 at Brewster’s angle and gets completely plane polarised. The angle of polarisation is
1. 82°
2. 57°
3. 30°
4. 60°
Option 2 – 57°
LASER light is considered to be coherent because it consists of ( CSIR Net Physics Previous Year QnA )
1. unco-ordinated wavelengths
2. co-ordinated waves of exactly the same wavelength
3. different wavelengths
4. none of the above
Option 2 – co-ordinated waves of exactly the same wavelength
Floating oil water shows colored on fringes due to interference of light. The order of magnitude of the thickness of oil for such an effect to be visible is
1. 10 cm
2. 100 cm
3. 10,000 Å
4. 100 Å
Option 3 – 10,000 Å
The specific rotation of the sugar solution angle is 66. What is the angle of optical rotation caused by sugar solution concentration 15 grm/ 100cc filled in a tube length 15cm ( CSIR Net Physics Previous Year QnA )
1. 27.8°
2. 10.8°
3. 14.8°
4. 14.8°
Option 4 – 14.8°
The quartz wave plate vertical axis is inserted into a beam of linearly polarised light oscillating at 45′, then the emerging light 9 will be.
1. vertically
2. vertically polarised
3. right circularly polarised
4. linearly polarised
Option 4 – linearly polarised
The displacement of Raman lines from the exciting radiation is characteristic of the ( CSIR Net Physics Previous Year QnA )
1. Scattered material
2. Exciting radiation intensity
3. Dispersion of the spectrograph
4. None of the above
Option 1 – Scattered material
At what angle should a light beam be incident on a calm water surface so that the reflected light is fully linearly polarized
1. 45°
2. 53°
3. 0°
4. 90°
Option 2 – 53°
When an unpolarised light mutually electric and magnetic field strength vectors are oriented in arbitrary directions in a plane
1. perpendicular
2. parallel
3. opposite
4. none of the above
Option 1 – perpendicular
A calcite crystal is a
1. opaque crystal
2. biaxial crystal
3. uniaxial crystal
4. transparent glass
Option 3 – uniaxial crystal
The scattering intensity of a liquid is 6 units at a wavelength of 500nm, then the scattering intensity at a wavelength of 400nm will be
1. 12
2. 3
3. 6
4. 8
Option 2 – 3
The Brewster angle for a certain material is found to be 60°. If the angle of incidence is 60°. What would be the angle of refraction in the material?
1. 60°
2. 45°
3. 30°
4. 32°
Option 3 – 30°
The quartz wave plate’s minimum thickness is t, it converted unpolarised light of wavelength 480 nm to circularly polarised light, then the corresponding wave length of the quartz plate is 600 nm to find out the thickness of the quartz plate.
1. 0.56t
2. 1.25 t
3. 1.54t
4. 1.5t
Option 2 – 1.25 t
In the scattering of light, the ratio of the intensity of light scattered at 300nm to that at 600nm is
1. 4
2. 2
3. 8
4. 16
Option 4 – 16
An example of Bosons is
1. Electron
2. Neutron
3. Proton
4. Photon
Option 4 – Photon
Electron is a particle of
1. Boson
2. Fermion
3. both
4. none
Option 2 – Fermion
Pauli’s exclusion principle is obeyed by
1. Fermions
2. Bosons
3. both
4. none
Option 1 – Fermions
The thermoelectric power of iron is 1734 microvolts at 0°C and 1247 micro-volts, and that of copper is 136 microvolts at 0’c and 231 micro-volts at 100°C. Calculate the e.m.f of the iron copper couple between the temperature 0°C and 100°C.
1. 17.4 volts
2. 130.7 mV
3. 130.76 volts
4. None of above
Option 2 – 130.7 mV
According to which of the following laws total energy emitted/sec/area by a perfectly black body corresponding to all wavelengths is directly proportional to the fourth power of the absolute temperature.
1. Wien’s Law
2. Newton’s Law
3. Steafan’s Law
4. Steafan-Boltzman Law
Option 3 – Steafan’s Law
The thermoelectric power of iron against lead is given by (1734-4.87T) and for copper by (136+0.95T), find the emf of iron-copper. Couple with junctions at 20°C and 100°C.
1. 909.2 mV
2. 900 volts
3. 1000 mV
4. 90 volts
Option 1 – 909.2 mV
For high-temperature measurements, thermo couple metals can be used.
1. Platinum
2. Molybdenum
3. Iron
4. (1) and (2)
Option 4 – (1) and (2)
In a double-slit experiment, with white light, a white fringe is observed on a screen kept behind the slits. When the screen is moved away by 0.05 m, this white fringe is.
1. disappears
2. becomes colored
3. does not move at all
4. gets displaced from its earlier position
Option 3 – does not move at all
A fringe is a path of
1. constant amplitude
2. constant phase
3. constant wavelength
4. none of these
Option 2 – constant phase
In Fresnel’s biprism arrangement, two virtual coherent sources are produced by
1. reflection
2. refraction
3. dispersion
4. interference
Option 2 – refraction
The refracting angle of Fresnel’s biprism is
1. nearly 1/2°
2. nearly 180°
3. exactly 179°
4. exactly 90°
Option 1 – nearly 1/2°
The nature of light waves is similar to
1. Alpha rays
2. Cathode rays
3. Gamma rays
4. Cosmic rays
Option 3 – Gamma rays
Two coherent monochromatic light beams of intensities I and 4I are superimposed the maximum and minimum possible intensities in the resulting beam are
1. 5I and I
2.5I and 3I
3. 9I and I
4. 9I and 3I
Option 3 – 9I and I
In the interference pattern, the fringe width is
1. directly proportional to the width of the slits
2. inversely proportional to the distance between the slits
3. inversely proportional to the distance between the slits and the screen
4. all of these
Option 2 – inversely proportional to the distance between the slits
In the following arrangements, coherent sources are obtained using a single monochromatic source, by the method of division of the wavefront.
1. Fresnel’s biprism
2. Lloyd’s mirror
3. Young’s the double slit
4. all of these
Option 2 – Lloyd’s mirror
In Newton’s rings the diameters of successive dark rings are
1. proportional to natural numbers
2. proportional to the square of natural numbers
3. proportional to the square root of natural numbers
4. inversely proportional to natural numbers
Option 3 – proportional to the square root of natural numbers
Two glass plates enclose a wedge-shaped air film touching at one edge and are separated by a wire of 0.05 mm diameter at a distance of 15cm from the edge. If a monochromatic light of wavelength 6000 Å from a broad source is incident on the air film, the fringe width is
1.0.02 cm
2.0.06 cm
3.0.03 cm
4. 0.09 cm
Option 4 – 0.09 cm
In Young’s double slit experiment, the first red-colored source is used. If the red source is replaced with a violet source
1. The bands become brighter
2. The bands become closer
3. Intensities increase
4. None of these
Option 2 – The bands become closer
The angle between the mirrors in the Michaelson interferometer is
1. 45°
2. 90°
3. 180°
4. 360°
Option 2 – 90°
Newton’s ring formed due to transmitted light
1. elliptical
2. as the rings due to reflected light
3. rings
4. hyperbolas
Option 3 – rings
An air wedge of angle 0.02 mm radian illuminated monochromatic light falling normally on it. If the fringe width is 0.015 mm, the wavelength of light used is
1. 6000 A
2. 4000 A
3.5000 A
4. 3000 A
Option 1 – 6000 A
The middle spot in Newton’s rings formed due to the reflected light is
1. Black
2. White
3. Bright
4. Colored
Option 1 – Black
Newton’s ring formed due to transmitted light
1. elliptical
2. as the rings due to reflected light
3. rings
4. hyperbolas
Option 3 – rings
The angle between the mirrors in the Michaelson interferometer is
1. 45°
2. 90°
3. 180°
4. 360°
Option 2 – 90°
Which of the following has a more resolving power
1. Prism
2. Grating
3. Telescope
4. Fabry-Perot interferometer
Option 4 – Fabry-Perot interferometer
In which of the following experiments the interference patterns are formed due to the division of vibrational limits
1. Young’s experiment
2. Fresnel’s biprism experiment
3. Lloyd’s mirror experiment
4. Newton rings
Option 4 – Newton rings
Young’s experiment is first conducted in the air. Then if it is dipped in water, the width of the interfering bands in the interference pattern
1. doesn’t change
2. decreases
3. increases
4. no bands are formed
Option 2 – decreases
The intensities of two coherent sources are in the ratio 81 : 1. The ratio of intensities of maxima and minima in the interference pattern is
1. 8 : 1
2. 9 : 1
3. 10 : 8
4. 25 : 16
Option 4 – 25 : 16
Two coherent sources have intensities I and 4I. If they produce an interference pattern, calculate the ratio of intensities of maxima and minima
1. 9 : 1
2. 4 : 1
3. 16 : 1
4. 1 : 1
Option 1 – 9 : 1
The scientist first proved the phenomenon of interference
1. Focolt
2. Huygens
3. Young
4. Newton
Option 3 – Young
Which of the following can act as coherent sources
1. 60W bulb and 100W bulb
2. Two bulbs of 60W
3. Two halves of a 60W bulb.
4. Two imaginary images formed by Fresnel’s biprism.
Option 4 – Two imaginary images formed by Fresnel’s biprism
The interference pattern is based on one of the following laws
1. Law of conservation of energy
2. Law of conservation of momentum
3. Law of conservation of angular momentum
4. Straight-line traveling of light
Option 1 – Law of conservation of energy
The ratio of vibrational limits of two is 2 : 1. The ratio of superposing waves intensities of maxima and minima
1. 2 : 1
2. 4 : 1
3. 3 : 1
4. 9 : 1
Option 4 – 9 : 1
The interference experiment in which a real source and an imaginary source are used is
1. Young’s experiment
2. Lloyd’s mirror
3. Fresnel’s biprism
4. Fresnel’s bimirror
Option 2 – Lloyd’s mirror
The excess phase difference is due to the reflection at the denser plane
1. π/2
2. 2π
3. 3π/2
4. π
Option 4 – π
The middle spot in Newton’s rings formed due to the reflected light is
1. Black
2. White
3. Bright
4. Colored
Option 1 – Black
Reason for colors of oil films on water ( Best Study Material for CSIR NET Life Sciences MCQ )
1. Analysis of light
2. Interference
3. Diffraction
4. Polarisation
Option 2 – Interference
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