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0
votes
Zeroth law of thermodynamics helped in the creation of which scale?
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A carnot engine extracts 1200J of energy from a hot reservoir. What is the amount of work done by it? Temperatures of hot and cold reservoirs are 200K and 150K respectively.
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Which of the following states of matter has the maximum value of mean free path?
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A force given by: F = -2(x – 1)^2acts on a particle at rest. Select the correct option regarding the same. (a) Force acts on particle along the positive x direction (b) Force is never zero
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
What is the time period of kinetic energy of a particle in SHM,if the time period of SHM is 4s?
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
All waves require material for propagation. True or False?
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A string has a mass of 100gm & is under a tension of 10N. What should be its length if the speed of transverse waves is to be 10m/s on the string.
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Why is the speed of longitudinal waves sound in solids greater than that in liquids?
answered
Oct 7, 2021
in
Class X
cbse
0
votes
The escape velocity for an object to leave the surface of the earth does not depend on its size, shape, mass or direction of projection of the body. (a) True (b) False
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Gravitational potential energy can be zero but gravitational potential can never be zero. (a) True (b) False
answered
Oct 7, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A 4kg eagle picks up a 75g snake and raises it 2.5 m from the ground to a branch. What is the work done by the eagle on the snake? (Assume g = 10 m/s^2)
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
The maximum value of gravitational potential energy is zero.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A satellite is seen after every 8 hours. If it rotates opposite to that of the earth, what is its angular velocity about the centre of the earth?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Assume that a satellite executes perfectly circular orbits around a perfectly circular sphere. The work done by the satellite in 1 complete revolution is _____
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
A wire has a cross sectional area ‘A’, length ‘L’ and young’s modulus ‘Y’. It is pulled by a force ‘F’ which causes a total extension of length ‘l’. The force F is so adjusted that the wire is only slowly stretched.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Viscosity is said to be internal friction between fluid layers. What type of force is it?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
An ice cube is kept on the surface of an aluminium block and another ice cube on the surface of a plastic block. Both blocks have the same temperature. Select the correct statement.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
Why is mercury used in thermometers?
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
For a constant volume gas thermometer select the correct statement.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
0
votes
For a constant volume gas thermometer select the correct statement.
answered
Oct 6, 2021
in
Class-XI-PHYSICS
cbse
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