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MCQ on CSIR NET Physics Online Coaching for Students
The viscosity of gas is due to the transport of ( CSIR NET Physics Online Coaching MCQ )
1. Mass
3. Momentum
4. None of above
Option 3 – Momentum
In diffusion the transport of which of the following occurs.
1. heat
2. energy
3. mass
4. momentum
Option 3 – mass
What is the temperature at which the root mean square velocity of the molecules will be zero? ( CSIR NET Physics Online Coaching MCQ )
1. 300°K
2. -273°K
3. -273°C
4. None of the above
Option 3 – -273°C
The vessel containing the gas has a small hole in it causing the gas to leak. When the temperature is increased from 400K to 900K the rate of leakage of the gas will be
1. decreases by a factor of 0.44
2. increases by a factor of 2.25
3. increases by a factor of 1.5
4. remains the same
Option 3 – increases by a factor of 1.5
For a diatomic gas having 3 translational and 2 rotational degrees of freedom, the energy is ( CSIR NET Physics Online Coaching MCQ )
1. KT
2. 5/2 KT
3. 3/2KT
4. KT/2
Option 2 – 5/2 KT
The coefficient of performance of a refrigerator working between 10°C and 20°C is
1. 11.77
2. 9.77
3. 8.77
4. 10.77
Option 3 – 8.77
The specific heat at a constant volume of solids is known to obey Debye’s T³ law ( CSIR NET Physics Online Coaching MCQ )
1. at high pressure
2. at high temperature
3. at low temperature
4. at very low temperature
Option 4 – at very low temperature
A gas behaves as an ideal gas
1. at high pressure and high temperature
2. very low pressure and high temperature
3. high pressure and low temperature
4. low pressure and low temperature
Option 2 – very low pressure and high temperature
The temperature of the inversion of hydrogen and helium is ( CSIR NET Physics Online Coaching MCQ )
1. -80°C, -240°C
2. -80 K, -240 K
3. 80°C, 240 K
4. (1) & (2) only
Option 1 – -80°C, -240°C
In a porous-plug experiment, the change in temperature of the gas depends upon
1. Its thermal conductivity
2. The difference in pressure on either side of the plug
3. Its specific heat
4. None of the above
Option 2 – The difference in pressure on either side of the plug
The following processes are used for cooling ( CSIR NET Physics Online Coaching MCQ )
1. Evaporation
2. Adiabatic demagnetization
3. Adiabatic expansion compressed gas
4. (2) & (3) only
Option 4 – (2) & (3) only
The dimensions of the constant b in Van der Waal’s gas equation are that of
1. Volume
2. Pressure
3. Volume x Pressure
4. Volume / Pressure
Option 1 – Volume
In the porous plug experiment, the temperature of the gas increases after throttling. The correct range for the initial temperature of the gas for this to happen is ( CSIR NET Physics Online Coaching MCQ )
1. Critical temperature to Boyle’s temperature
2. Boiling temperature to critical temperature
3. Below inversion temperature
4. (2) and (3)
Option 4 – (2) and (3)
Joule-Thomson cooling is
1. Temperature independent
2. Temperature-dependent
3. Inversely proportional to molecular weight
4. Dependent on the total mass of gas
Option 2 – Temperature-dependent
A wire of linear density 0.01 gm/em is stretched with a tension of 10N. It resonates at a frequency of 200Hz. The next higher frequency at which it resonates is 240 Hz. Find the length of the wire ( CSIR NET Physics Online Coaching MCQ )
1. 1.25 cm
2. 1.25 m
3. 125 m
4. 1m
Option 2 – 1.25 m
A wave traveling in a rod meets a metallic joint where the Young modulus is twice the value but density remains the same. Calculate the reflection and transmission coefficient of the amplitude
1. 0.17, 0.83
2. 0.88, 0.77
3. 0.83, 0.07
4. 1.17, 1.83
Option 1 – 0.17, 0.83
A stretched string is observed to vibrate with a frequency of 30 c.p.s in the fundamental note when the length of the string is 60 cm. The string has a mass of 0.5 gm/cm. Find the velocity of propagation of the transverse wave and compute the tension of the string ( CSIR NET Physics Online Coaching MCQ )
1. 360 m
2. 3600 cm/sec
3. 3600 m/sec
4. 36 m/sec
Option 2 – 3600 cm/sec
A tuning fork has a frequency of 256 and an amplitude of 0.5 cm. If the velocity of sound is 340 m/s, calculate the energy current (The density of air is 0.001293 gm/cc)
1. 119 J/s/m
2. 119 J/s/m²
3. 119 J/s
4. 109 J/s/m²
Option 2 – 119 J/s/m²
In a non-dispersive medium, the group velocity is ( CSIR NET Physics Online Coaching MCQ )
1. less than the phase velocity
2. greater than the phase velocity
3. equal to the phase velocity
4. independent of phase velocity
Option 3 – equal to the phase velocity
The advantage of a hinged beam is
1. it remains stable
2. it can move easily toward left
3. it can move easily toward the right
4. very cheap
Option 1 – it remains stable
Consider a tank full of water up to a height of h. now, the water load acting on the floor of the tank is ( CSIR NET Physics Online Coaching MCQ )
1. point load
2. uniformly varying load
3. Uniformly concentrated load
4. none
Option 3 – Uniformly concentrated load
A line obtained by the intersection of the neutral surface and plane of bending is called.
1. bending axis
2. neutral axis
3. neutral filament
4. neutral surface
Option 2 – neutral axis
A horizontal beam with one end rigidly fixed and loaded at its free end is called ( CSIR NET Physics Online Coaching MCQ )
1. Longitudinal filament
2. Neutral surface
3. Simple beam
4. Contilever
Option 4 – Contilever
In knife-edge support, the reactions at two edges will be
1. Parallel to the beam surface
2. Perpendicular to the beam surface
3. Inclined to the beam surface
4. None
Option 2 – Perpendicular to the beam surface
In pin-joint support, if the load is vertical, then the reaction will be
1. vertical
2. horizontal
3. inclined
4. none
Option 1 – vertical
If the loads are applied perpendicular to the axis of the beam, then they produce
1. shear
2. bending
3. shear and bending
4. none
Option 3 – shear and bending
If the loads are not applied perpendicular to the beam, they produce
1. shear forces
2. axial forces
3. shear and axial forces
4. none
Option 2 – axial forces
A beam with more than two supports is known as
1. simple beam
2. double overhanging beam
3. continuous beam
4. cantilever beam
Option 3 – continuous beam
The angular velocity of a wheel increases from 1200 to 4500 rev/min in 10 seconds. Calculate its angular acceleration and the number of revolutions made during this time.
1. 475
2. 400
3. 375
4. 175
Option 1 – 475
A mass M is moving constant velocity with parallel to X-axis, its angular momentum with respect to origin.
1. goes in decreasing
2. zero
3. goes in increasing
4. remains constant
Option 4 – remains constant
A metre stick is held vertically with one end on the floor and is then allowed to fall. Find the velocity of the other end. when it hits the floor, assuming that the end on the floor does not slip
1. 2.7 m/s
2.5.4 ms²
3. 4.5 m/s
4. 5.4 m/s
Option 4 – 5.4 m/s
A ring of mass 0.3kg and radius 0.1m and a solid cylinder of mass 0.4kg and of the same radius are given the same kinetic energy and released simultaneously on a flat horizontal surface such that they begin to roll as soon as released towards a wall which is at the same distance from the ring and the cylinder. The rolling fric tion in both cases is negligible. Then
1. the cylinder will reach the wall first
2. both will reach the wall simultaneously
3. the ring will reach the wall first
4. none will reach the wall
Option 2 – both will reach the wall simultaneously
The mass of a balloon with its contents is 1.5kg, it is descending with an acceleration equal to half that of acceleration due to gravity. If it is to go up with same acceleration keeping the volume same, it should be decreased by
1. 0.65kg
2. 0.5kg
3. 1kg
4. 2kg
Option 3 – 1kg
A bomb of mass 9kg explodes into two pieces of mass 3kg and 6kg. The velocity of 3kg mass is 16 m/s. The kinetic energy piece is
1. 192 J
2. 96 J
3. 768 J
4. None of above
Option 1 – 192 J
The speed of particle moving along a circle of radius 20 cms increases at the rate of 10 cm/sec² if the mass is 200 gms find the torque on it.
1. 0.04 N-m
2. 0.004 N-m
3. 0.0004 N-m
4. None of above
Option 3 – 0.0004 N-m
A ballet dancer spins about a vertical axis at the rate of 1 revolution per second with her arms out stretched. When her arms are folded her moment of inertia about the vertical axis decreases by 60%. Compute the new rate of revolution.
1. 1 Rev/sec
2. 2 Rev/sec
3. 1.82 Rev/sec
4. 2.5 Rev/sec
Option 4 – 2.5 Rev/sec
If the earth suddenly contracts to half its radius what would be the length of the day. By how much would the duration of day be decreased.
1. 22 hours
2. 18 hours
3. 9 hours
4. 6 hours
Option 2 – 18 hours
Lakes freeze in cold countries in winter, leaving the water underneath at:
(a) 0ºC
(b) 0°F
(c) 4°C
(d) 4°F
Option c – 4°C
The device used to change the speed of an electric fan is:
(a) Regulator
(b) Amplifier
(c) Rectifier
(d) Switch
Option a – Regulator
The modulus of rigidity is the ratio of:
(a) Volume stress to volume strain
(b) Shearing stress to tensile strain
(c) Tensile stress to tensile strain
(d) Longitudinal stress to longitudinal strain
Option b – Shearing stress to tensile strain
It is difficult to cook rice:
(a) At the sea level
(b) Under a mine
(c) At the top of a mountain
(d) Same anywhere
Option c – At the top of a mountain
The hair of a shaving brush clings together when removed from water due to:
(a) Viscosity
(b) Surface tension
(c) Friction
(d) Elasticity
Option b – Surface tension
The weakest of all fundamental forces is:
(a) Magnetic force
(b) Nuclear force
(c) Gravitational force
(d) Electrostatic force
Option c – Gravitational force
An object moving in a circular path with constant speed has:
(a) Variable acceleration
(b) Uniform acceleration
(c) Uniform retardation
(d) Centrifugal acceleration
Option a – Variable acceleration
A ball pen functions on the principle of:
(a) Gravitational force
(b) Boyle’s law
(c) Viscosity
(d) Surface tension
Option d – Surface tension
A copper disc has a hole. If the disc is heated, the size of the hole:
(a) Increases
(b) Decreases
(c) No change
(d) First increases and then decreases
Option a – Increases
Bats can sense obstacles because they produce:
(a) Micro sound waves
(b) Supersonic sound waves
(c) Infrasonic sound waves
(d) Ultrasonic sound waves
Option d – Ultrasonic sound waves
The four-stroke petrol engine is based on:
(a) Diesel cycle
(b) Boyle’s cycle
(c) Otto cycle
(d) Carnot cycle
Option c – Otto cycle
The amount of water vapour in the atmosphere is measured in terms of:
(a) Humidity
(b) Droplets
(c) Smog
(d) All of these
Option a – Humidity
The process of production of energy in the sun is:
(a) Radioactivity
(b) Nuclear fusion
(c) Ionization
(d) Nuclear fission
Option b – Nuclear fusion
If a body moves with a constant speed in a circle:
(a) No work is done on it
(b) No force acts on it
(c) Its velocity remains constant
(d) No acceleration is produced in it
Option c – Its velocity remains constant
Rainbow is formed due to:
(a) Scattering and refraction
(b) Refraction and reflection
(c) Diffraction and refraction
(d) Refraction and dispersion
Option b – Refraction and reflection
The Dynamo converts:
(a) Mechanical energy to electrical energy
(b) Electrical energy to mechanical energy
(c) Mechanical energy into magnetic energy
(d) None of these
We feel cool when we sit near a fan because:
(a) Fan gives cool air
(b) We feel cool when air touches the body
(c) Fan cools surrounding air
(d) Air evaporates the sweat on our body
Option d – Air evaporates the sweat on our body
An object covers a distance directly proportional to the square of time. Its acceleration is:
(a) Constant
(b) Zero
(c) Increasing
(d) Decreasing
Option a – Constant
Which of the following devices can be used to detect radiant heat?
(a) Constant volume air thermometer
(b) Thermopile
(c) Liquid thermometer
(d) Six’s maximum and minimum thermometer
Option b – Thermopile
The word ‘insolation’ means:
(a) Incoming solar radiation
(b) Matters which insulate
(c) Insoluble matters
(d) None of these
Option a – Incoming solar radiation
In a conductor:
(a) The forbidden energy gap is very narrow
(b) The forbidden energy gap is very wide
(c) There is no conduction band
(d) The valence band and the conduction band overlap each other
Option d – The valence band and the conduction band overlap each other
A real gas can act as an ideal gas in:
(a) Low pressure and high temperature
(b) Low pressure and low temperature
(c) High pressure and high temperature
(d) High pressure and low temperature
Option a – Low pressure and high temperature
The motion of the wheels of a bullock cart while moving on the road is an example of:
(a) Translatory and rotatory motion
(b) Oscillatory motion
(c) Vibratory motion
(d) Translatory motion
Option a – Translatory and rotatory motion
The unit of noise pollution is:
(a) ppm
(b) Decimal
(c) Decibel
(d) None of these
Option c – Decibel
Negative feedback in amplifiers:
(a) Decreases bandwidth and increases noise
(b) Decreases bandwidth and decreases noise
(c) Increases bandwidth and decreases noise
(d) Increases bandwidth and increases noise
Option c – Increases bandwidth and decreases noise
An athlete runs before a long jump to get advantage on:
(a) Moment of force
(b) Principle of moments
(c) Inertia of motion
(d) Frictional force
Option c – Inertia of motion
What is viewed through an electron microscope?
(a) Structure of bacteria and viruses
(b) Electrons and other elementary particles
(c) Inside of the human eye
(d) Inside of the human stomach
Option a – Structure of bacteria and viruses
The following particles move with the same kinetic energy. Which of them has maximum momentum?
(a) Proton
(b) Deuteron
(c) Electron
(d) Alpha particle
Option d – Alpha particle
When a ship enters the sea from a river:
(a) It rises a little
(b) It sinks a little
(c) It remains at the same level
(d) It rises or sinks depending on the material it is made of
Option a – It rises a little
The spokes used in the wheel of a bicycle increase its:
(a) Moment of inertia
(b) Acceleration
(c) Momentum
(d) Velocity
Option a – Moment of inertia
For a person having hypermetropia, the near point is:
(a) Greater than 25 cm
(b) Greater than 50 cm
(c) Less than 25 cm
(d) Infinity
Option a – Greater than 25 cm
When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to:
(a) Refraction
(b) Forced vibrations
(c) Reflection
(d) Damped vibrations
Option b – Forced vibrations
The plastic material commonly used for making gear wheels is:
(a) Nylon
(b) Polyester
(c) Polystyrene
(d) Bakelite
Option a – Nylon
Flight recorder is technically called:
(a) Black box
(b) Dark box
(c) Blind box
(d) Altitude meter
Option a – Black box
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