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CSIR Net Physics Previous Year Question Papers Mock Test for Students
An open organ pipe has a frequency of 156 Hz at 15 °C. At what temperature will its frequency increase to 160 Hz?
a) 30 °C
b) 50 °C
c) 70 °C
d) 90 °C
Option a – 30 °C
A pipe that is 85 cm long and closed at one end can support how many natural frequencies below 1250 Hz if the speed of sound in air is 340 m/s?
a) 6
b) 4
c) 12
d) 8
Option a – 6
For a pipe closed at one end with a length of 85 cm, how many natural frequencies will exist under 1250 Hz if sound travels at 340 m/s?
a) 4
b) 5
c) 7
d) 6
Option d – 6
Two closed organ pipes are played together, creating 5 beats per second. If their lengths are in the ratio 21:20, what are their frequencies?
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 340 Hz tuning fork is placed at the open end of a tube 150 cm high. Water is slowly poured in. What is the minimum water height required to achieve resonance? (Speed of sound in air = 340 m/s)
a) 25 cm
b) 45 cm
c) 75 cm
d) 95 cm
Option a – 25 cm
A tuning fork produces 5 beats per second with an air column at 27 °C. When the temperature drops to -3 °C, beats stop. The fork’s frequency is:
a) 70 Hz
b) 92 Hz
c) 104 Hz
d) 147 Hz
Option b – 92 Hz
A glass tube 1.1 m long has adjustable water levels. A tuning fork with 660 Hz is placed near the tube’s open end. How many harmonics can this tube support? (Speed of sound = 330 m/s)
a) 2
b) 3
c) 4
d) 5
Option c – 4
Light passing through a single Nicol prism becomes
a) Unpolarised
b) Elliptically polarised
c) Plane polarised
d) None of these
Option c – Plane polarised
Which of the following waves cannot be polarised?
a) Sound waves
b) Gamma rays
c) Radio waves
d) UV rays
Option a – Sound waves
When a sugar solution rotates the plane of polarisation to the right, the solution is
a) Laevo-rotatory
b) Polarised
c) Dextro-rotatory
d) Unpolarised
Option c – Dextro-rotatory
At the polarising angle, the angle between the reflected and refracted rays is
a) 90°
b) 180°
c) 45°
d) 60°
Option a – 90°
Two Nicol prisms are set so their principal planes are at 30°. What percentage of unpolarised light passes through?
a) 37.5%
b) 75%
c) 100%
d) None of these
Option a – 37.5%
When light strikes a surface at its polarising angle of 57°, the correct angle of incidence is
a) 57°
b) 37°
c) 90°
d) 137°
Option a – 57°
Light is incident on a surface at 60°, and the reflected and refracted rays are perpendicular. The refractive index of the surface is
a) 1.5
b) 2
c) 1.732
d) None of these
Option c – 1.732
When unpolarised light strikes a glass plate (refractive index 1.54) at Brewster’s angle, the polarisation angle is
a) 82°
b) 57°
c) 30°
d) 60°
Option b – 57°
Laser light is called coherent because it consists of
a) Uncoordinated wavelengths
b) Coordinated waves of identical wavelength
c) Mixed wavelengths
d) None of these
Option b – Coordinated waves of identical wavelength
The colourful fringes on floating oil on water are due to light interference. The typical thickness of the oil layer is
a) 10 cm
b) 100 cm
c) 10,000 Å
d) 100 Å
Option c – 10,000 Å
A sugar solution with a specific rotation of 66° has a concentration of 15 grams per 100 cc in a tube 15 cm long. The optical rotation observed is
a) 27.8°
b) 10.8°
c) 14.8°
d) 14.8°
Option d – 14.8°
When a quartz wave plate is placed in a beam of linearly polarised light vibrating at 45°, the outgoing light is
a) Vertical
b) Vertically polarised
c) Right circularly polarised
d) Linearly polarised
Option d – Linearly polarised
The displacement of Raman lines from the incident light depends on the
a) Scattering substance
b) Intensity of incident radiation
c) Spectrograph dispersion
d) None of these
Option a – Scattering substance
To fully polarise reflected light on calm water, the incident light must strike at an angle of
a) 45°
b) 53°
c) 0°
d) 90°
Option b – 53°
In unpolarised light, the electric and magnetic field vectors are arranged
a) Perpendicularly
b) Parallel
c) Opposite
d) None of these
Option a – Perpendicularly
Calcite crystals are classified as
a) Opaque crystals
b) Biaxial crystals
c) Uniaxial crystals
d) Transparent glass
Option c – Uniaxial crystals
If a liquid scatters light with an intensity of 6 units at 500 nm, what will the scattering intensity be at 400 nm?
a) 12
b) 3
c) 6
d) 8
Option b – 3
If the Brewster angle for a material is 60°, what is the angle of refraction when light hits at that angle?
a) 60°
b) 45°
c) 30°
d) 32°
Option c – 30°
A quartz wave plate of minimum thickness t converts unpolarised light of 480 nm to circularly polarised light. For light of 600 nm, the required thickness is
a) 0.56 t
b) 1.25 t
c) 1.54 t
d) 1.5 t
Option b – 1.25 t
In light scattering, what is the ratio of scattered light intensity at 300 nm to that at 600 nm?
a) 4
b) 2
c) 8
d) 16
Option d – 16
Which of the following is an example of a Boson? ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Electron
b) Neutron
c) Proton
d) Photon
Option d – Photon
The electron is classified as which type of particle? ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Boson
b) Fermion
c) Both
d) None
Option b – Fermion
Which particles obey Pauli’s exclusion principle? ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Fermions
b) Bosons
c) Both
d) None
Option a – Fermions
The thermoelectric power of iron is 1734 µV at 0°C and 1247 µV at 100°C. Copper has 136 µV at 0°C and 231 µV at 100°C. Calculate the emf of the iron-copper pair between 0°C and 100°C.
a) 17.4 V
b) 130.7 mV
c) 130.76 V
d) None of these
Option b – 130.7 mV
Which law states that the total energy emitted per unit area per second by a perfect black body is proportional to the fourth power of its absolute temperature? ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Wien’s Law
b) Newton’s Law
c) Stefan’s Law
d) Stefan-Boltzmann Law
Option c – Stefan’s Law
For the thermoelectric power of iron vs lead given as (1734 – 4.87T) and for copper as (136 + 0.95T), calculate the emf of an iron-copper junction between 20°C and 100°C.
a) 909.2 mV
b) 900 V
c) 1000 mV
d) 90 V
Option a – 909.2 mV
Which metals are used in thermocouples for high-temperature measurements? ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Platinum
b) Molybdenum
c) Iron
d) Both a and b
Option d – Both a and b
In a double-slit setup with white light, when the screen is moved 0.05 m away, what happens to the central white fringe?
a) It disappears
b) It becomes coloured
c) It remains stationary
d) It shifts from its original position
Option c – It remains stationary
What does a fringe represent in interference patterns?
a) Constant amplitude
b) Constant phase
c) Constant wavelength
d) None of these
Option b – Constant phase
In Fresnel’s biprism experiment, virtual coherent sources are produced through which process? ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Reflection
b) Refraction
c) Dispersion
d) Interference
Option b – Refraction
The refracting angle of Fresnel’s biprism is approximately
a) 1/2°
b) 180°
c) 179°
d) 90°
Option a – 1/2°
Light waves have properties similar to which of the following? ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Alpha rays
b) Cathode rays
c) Gamma rays
d) Cosmic rays
Option c – Gamma rays
Two coherent monochromatic light beams with intensities I and 4I are superimposed. The maximum and minimum resultant intensities are
a) 5I and I
b) 5I and 3I
c) 9I and I
d) 9I and 3I
Option c – 9I and I
In interference, fringe width is ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Directly proportional to slit width
b) Inversely proportional to slit separation
c) Inversely proportional to screen distance
d) All of these
Option b – Inversely proportional to slit separation
In which setup are coherent sources created using wavefront division?
a) Fresnel’s biprism
b) Lloyd’s mirror
c) Young’s double slit
d) Lloyd’s mirror only
Option b – Lloyd’s mirror
In Newton’s rings, the diameters of successive dark rings vary ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Directly with natural numbers
b) Directly with the square of natural numbers
c) Directly with the square root of natural numbers
d) Inversely with natural numbers
Option c – Directly with the square root of natural numbers
In an air wedge formed by two glass plates, a wire of 0.05 mm diameter separates them at a distance of 15 cm. Using monochromatic light of wavelength 6000 Å, the fringe width is
a) 0.02 cm
b) 0.06 cm
c) 0.03 cm
d) 0.09 cm
Option d – 0.09 cm
In Young’s double slit experiment, if the red light source is replaced with violet light, what happens?
a) Bands become brighter
b) Bands move closer
c) Intensities increase
d) None of these
Option b – Bands move closer
In a Michelson interferometer, the angle between the mirrors is
a) 45°
b) 90°
c) 180°
d) 360°
Option b – 90°
Newton’s rings observed in transmitted light appear as ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Ellipses
b) Similar to reflected light rings
c) Concentric rings
d) Hyperbolas
Option c – Concentric rings
An air wedge with an angle of 0.02 mm radian is illuminated by monochromatic light. If the fringe width is 0.015 mm, the wavelength used is
a) 6000 Å
b) 4000 Å
c) 5000 Å
d) 3000 Å
Option a – 6000 Å
The central spot in Newton’s rings seen by reflected light appears ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Black
b) White
c) Bright
d) Coloured
Option a – Black
Newton’s rings observed through transmitted light appear as
a) Elliptical shapes
b) Similar rings as seen in reflected light
c) Circular rings
d) Hyperbolic patterns
Option c – Circular rings
The mirrors in a Michelson interferometer are positioned at an angle of ( CSIR Net Physics Previous Year Question Papers MCQ )
a) 45°
b) 90°
c) 180°
d) 360°
Option b – 90°
Which of the following devices offers the highest resolving power?
a) Prism
b) Diffraction Grating
c) Telescope
d) Fabry-Perot Interferometer
Option d – Fabry-Perot Interferometer
In which experiment are interference patterns formed due to the division of wavefronts?
a) Young’s Double Slit Experiment
b) Fresnel’s Biprism Experiment
c) Lloyd’s Mirror Experiment
d) Newton’s Rings
Option d – Newton’s Rings
If Young’s double slit experiment is done in air and then repeated in water, the fringe spacing will
a) Remain unchanged
b) Decrease
c) Increase
d) Disappear completely
Option b – Decrease
Two coherent sources have intensity ratios of 81:1. The ratio of maximum to minimum intensity in the interference pattern will be ( CSIR Net Physics Previous Year Question Papers MCQ )
a) 8:1
b) 9:1
c) 10:8
d) 25:16
Option d – 25:16
If two coherent sources have intensities I and 4I, the ratio of maximum to minimum intensity in their interference pattern will be
a) 9:1
b) 4:1
c) 16:1
d) 1:1
Option a – 9:1
Which scientist first demonstrated the interference of light? ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Foucault
b) Huygens
c) Young
d) Newton
Option c – Young
Which of the following can function as coherent sources?
a) A 60W bulb and a 100W bulb
b) Two separate 60W bulbs
c) Two halves of a 60W bulb
d) Two virtual sources created by Fresnel’s Biprism
Option d – Two virtual sources created by Fresnel’s Biprism
The interference pattern is a direct result of which fundamental principle?
a) Conservation of Energy
b) Conservation of Momentum
c) Conservation of Angular Momentum
d) Rectilinear Propagation of Light
Option a – Conservation of Energy
If the amplitude ratio of two superimposed waves is 2:1, the ratio of maximum to minimum intensity will be ( CSIR Net Physics Previous Year Question Papers MCQ )
a) 2:1
b) 4:1
c) 3:1
d) 9:1
Option d – 9:1
In which interference setup is a real source combined with its virtual image to create the pattern?
a) Young’s Double Slit Experiment
b) Lloyd’s Mirror Experiment
c) Fresnel’s Biprism Experiment
d) Fresnel’s Double Mirror Experiment
Option b – Lloyd’s Mirror Experiment
When light reflects off a denser medium, the additional phase shift is ( CSIR Net Physics Previous Year Question Papers MCQ )
a) π/2
b) 2π
c) 3π/2
d) π
Option d – π
The central fringe in Newton’s rings observed in reflected light appears
a) Black
b) White
c) Bright
d) Colored
Option a – Black
The colorful appearance of oil films floating on water is mainly due to ( CSIR Net Physics Previous Year Question Papers MCQ )
a) Light analysis
b) Interference
c) Diffraction
d) Polarization
Option b – Interference
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