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MCQ on CSIR NET Life Science for Students
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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