Physics-
General
Easy
Question
Figure shows the variation of the internal energy U with density r of one mole of an ideal monatomic gas for thermodynamic cycle ABCA. Here process AB is a part of rectangular hyperbola :-
- process AB is isothermal & net work in cycle is done by gas
- process AB is isobaric & net work in cycle is done by gas
- process AB is isobaric & net work in cycle is done on the gas
- process AB is adiabatic & net work in cycle is done by gas
The correct answer is: process AB is isobaric & net work in cycle is done by gas
For the process AB: Ur = constant (hyperbola)
(monoatomic ideal gas);
Comparing it with ideal gas equation
P-V graph for the cycle is Thus work done in cycle is positive
Related Questions to study
Physics-
Given T–P curve for three processes. If initial and final pressure are same for all processes then work done in process 1, 2 and 3 is respectively. Correct order is
Given T–P curve for three processes. If initial and final pressure are same for all processes then work done in process 1, 2 and 3 is respectively. Correct order is
Physics-General
Physics-
Suppose 0.5 mole of an ideal gas undergoes an isothermal expansion as energy is added to it as heat Q. Graph shows the final volume versus Q. The temperature of the gas is (use n 9 = 2 and R= 25/3 J/mol-K)
Suppose 0.5 mole of an ideal gas undergoes an isothermal expansion as energy is added to it as heat Q. Graph shows the final volume versus Q. The temperature of the gas is (use n 9 = 2 and R= 25/3 J/mol-K)
Physics-General
Physics-
Figure demonstrates a polytropic process (i.e. = constant) for an ideal gas. The work done by the gas will be in process AB is
Figure demonstrates a polytropic process (i.e. = constant) for an ideal gas. The work done by the gas will be in process AB is
Physics-General
Physics-
The gas left in the vessel will be 2g of hydrogen i.e. number of moles
The gas left in the vessel will be 2g of hydrogen i.e. number of moles
Physics-General
Physics-
A vessel contains 14 g (7 moles) of hydrogen and 96 g (3 moles) of oxygen at STP. Chemical reaction is induced by passing electric spark in the vessel till one of the gases is consumed. The temperature is brought back to it's starting value 273 K. The pressure in the vessel is-
A vessel contains 14 g (7 moles) of hydrogen and 96 g (3 moles) of oxygen at STP. Chemical reaction is induced by passing electric spark in the vessel till one of the gases is consumed. The temperature is brought back to it's starting value 273 K. The pressure in the vessel is-
Physics-General
Physics-
A fine steel wire of length 4m is fixed rigidly in a heavy brass frame as shown in figure. It is just taut at . The tensile stress developed in steel wire if whole system is heated to is :–
A fine steel wire of length 4m is fixed rigidly in a heavy brass frame as shown in figure. It is just taut at . The tensile stress developed in steel wire if whole system is heated to is :–
Physics-General
Physics-
Figures shows the expansion of a 2m long metal rod with temperature. The volume expansion coefficient of the metal is :–
Figures shows the expansion of a 2m long metal rod with temperature. The volume expansion coefficient of the metal is :–
Physics-General
Physics-
The figure shows two thin rods, one made of aluminum and the other of steel . Each rod has the same length and the same initial temperature. They are attached at one end to two separate immovable walls. Temperature of both the rods is increased by the same amount, until the gap between the rods vanishes. Where do the rods meet when the gap vanishes?
The figure shows two thin rods, one made of aluminum and the other of steel . Each rod has the same length and the same initial temperature. They are attached at one end to two separate immovable walls. Temperature of both the rods is increased by the same amount, until the gap between the rods vanishes. Where do the rods meet when the gap vanishes?
Physics-General
Physics-
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart .The power supplied to the cart, when its velocity becomes 5 m/sec., is equal to :
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart .The power supplied to the cart, when its velocity becomes 5 m/sec., is equal to :
Physics-General
Physics-
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart .The time at which velocity of cart becomes 2 m/sec, is equal to
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart .The time at which velocity of cart becomes 2 m/sec, is equal to
Physics-General
Physics-
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart .In the above problem, what is the acceleration of cart at this instant –
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart .In the above problem, what is the acceleration of cart at this instant –
Physics-General
Physics-
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart .Velocity of cart at t = 10 sec. is equal to :
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart .Velocity of cart at t = 10 sec. is equal to :
Physics-General
Physics-
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart . Initially the force on the cart is equal to :
on relative change of momentum with respect to surface. Let any instant the velocity of surface is u, then above equation becomes – Based on above concept, in the below given figure, if the cart is frictionless and free to move in horizontal direction, then answer the following :
Given cross-section area of jet velocity of jet ., density of liquid of cart . Initially the force on the cart is equal to :
Physics-General
Physics-
A cylindrical vessel of 90 cm height is kept filled upto the brim. It has four holes 1, 2, 3, 4 which are respectively at heights of 20cm, 30 cm, 40 cm and 50 cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from
A cylindrical vessel of 90 cm height is kept filled upto the brim. It has four holes 1, 2, 3, 4 which are respectively at heights of 20cm, 30 cm, 40 cm and 50 cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from
Physics-General
Physics-
Two forces and act on a thin uniform elastic rod placed in space. Force acts at right end of the rod and acts exactly at centre of the rod as shown (both forces act parallel to length of the rod).
i) causes extension of rod while causes compression of rod.
ii) causes extension of rod and also causes extension of rod.
iii) causes extension of rod while does not change length of rod.
The correct order of True / False in above statements is
Two forces and act on a thin uniform elastic rod placed in space. Force acts at right end of the rod and acts exactly at centre of the rod as shown (both forces act parallel to length of the rod).
i) causes extension of rod while causes compression of rod.
ii) causes extension of rod and also causes extension of rod.
iii) causes extension of rod while does not change length of rod.
The correct order of True / False in above statements is
Physics-General