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MCQ on CSIR NET Physics Online Coaching for Students
The viscosity of gas is due to the transport of
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?
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
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
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
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
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
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
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
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
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
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
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
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