Physics-
General
Easy
Question
Carnot cycle (reversible) of a gas represented by a Pressure-Volume curve is shown in the diagram
Consider the following statements
I).Area ABCD = Work done on the gas
II).Area ABCD = Net heat absorbed
III).Change in the internal energy in cycle = 0
Which of these are correct
- I only
- II only
- II and III
- I, II and III
The correct answer is: II and III
Work done by the gas (as cyclic process is clockwise) \ DW = Area ABCD
So from the first law of thermodynamics DQ (net heat absorbed) = DW = Area ABCD
As change in internal energy in cycle DU = 0.
Related Questions to study
physics-
A cyclic process ABCD is shown in the figure P-V diagram. Which of the following curves represent the same process
A cyclic process ABCD is shown in the figure P-V diagram. Which of the following curves represent the same process
physics-General
physics-
A cyclic process for 1 mole of an ideal gas is shown in figure in the V-T, diagram. The work done in AB, BC and CA respectively
A cyclic process for 1 mole of an ideal gas is shown in figure in the V-T, diagram. The work done in AB, BC and CA respectively
physics-General
physics-
In the following indicator diagram, the net amount of work done will be
In the following indicator diagram, the net amount of work done will be
physics-General
physics-
An ideal gas is taken through the cycle A ® B ® C ® A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is
An ideal gas is taken through the cycle A ® B ® C ® A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is
physics-General
physics-
The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from A ® B ® C is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is
The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from A ® B ® C is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is
physics-General
physics-
In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively, are
In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively, are
physics-General
physics-
Four curves A, B, C and D are drawn in the adjoining figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are
Four curves A, B, C and D are drawn in the adjoining figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are
physics-General
physics-
P-V plots for two gases during adiabatic process are shown in the figure. Plots 1 and 2 should correspond respectively to
P-V plots for two gases during adiabatic process are shown in the figure. Plots 1 and 2 should correspond respectively to
physics-General
physics-
A thermodynamic process is shown in the figure. The pressures and volumes corresponding to some points in the figure are : 
and 
In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be
A thermodynamic process is shown in the figure. The pressures and volumes corresponding to some points in the figure are : and
In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be
physics-General
physics-
An ideal gas of mass m in a state A goes to another state B via three different processes as shown in figure. If 
and 
denote the heat absorbed by the gas along the three paths, then
An ideal gas of mass m in a state A goes to another state B via three different processes as shown in figure. If and denote the heat absorbed by the gas along the three paths, then
physics-General
physics-
The P-V diagram shows seven curved paths (connected by vertical paths) that can be followed by a gas. Which two of them should be parts of a closed cycle if the net work done by the gas is to be at its maximum value
The P-V diagram shows seven curved paths (connected by vertical paths) that can be followed by a gas. Which two of them should be parts of a closed cycle if the net work done by the gas is to be at its maximum value
physics-General
physics-
A system goes from A to B via two processes I and II as shown in figure. If 
and 
are the changes in internal energies in the processes I and II respectively, then
A system goes from A to B via two processes I and II as shown in figure. If and are the changes in internal energies in the processes I and II respectively, then
physics-General
physics-
Following figure shows on adiabatic cylindrical container of volume 
divided by an adiabatic smooth piston (area of cross-section = A) in two equal parts. An ideal gas 
is at pressure P1 and temperature T1 in left part and gas at pressure P2 and temperature T2 in right part. The piston is slowly displaced and released at a position where it can stay in equilibrium. The final pressure of the two parts will be (Suppose x = displacement of the piston)
Following figure shows on adiabatic cylindrical container of volume divided by an adiabatic smooth piston (area of cross-section = A) in two equal parts. An ideal gas is at pressure P1 and temperature T1 in left part and gas at pressure P2 and temperature T2 in right part. The piston is slowly displaced and released at a position where it can stay in equilibrium. The final pressure of the two parts will be (Suppose x = displacement of the piston)
physics-General
physics-
A cylindrical tube of uniform cross-sectional area A is fitted with two air tight frictionless pistons. The pistons are connected to each other by a metallic wire. Initially the pressure of the gas is P0 and temperature is T0, atmospheric pressure is also P0. Now the temperature of the gas is increased to 2T0, the tension in the wire will be
A cylindrical tube of uniform cross-sectional area A is fitted with two air tight frictionless pistons. The pistons are connected to each other by a metallic wire. Initially the pressure of the gas is P0 and temperature is T0, atmospheric pressure is also P0. Now the temperature of the gas is increased to 2T0, the tension in the wire will be
physics-General
maths-
The shaded region in the figure represents
The shaded region in the figure represents
maths-General
