When a system is taken from state i to a state f along path iaf, Q = 50 J and W = 20 J. Along path ibf, Q = 35 J. If W = –13 J for the curved return path f i, Q for this path is
(1) 33 J
(2) 23 J
(3) – 7 J
(4) – 43 J
An ideal gas is taken from point A to point B, as shown in the P-V diagram. The work done in the process is:
1.
2.
3.
4.
Consider a process shown in the figure. During this process the work done by the system -
(1) Continuously increases
(2) Continuously decreases
(3) First increases, then decreases
(4) First decreases, then increases
Six moles of an ideal gas perform a cycle shown in figure. If the temperature are TA = 600 K, TB = 800 K, TC = 2200 K and TD = 1200 K, the work done per cycle is -
(1) 20 kJ
(2) 30 kJ
(3) 40 kJ
(4) 60 kJ
In the following figure, four curves A, B, C and D are shown. The curves are
(1) Isothermal for A and D while adiabatic for B and C
(2) Adiabatic for A and C while isothermal for B and D
(3) Isothermal for A and B while adiabatic for C and D
(4) Isothermal for A and C while adiabatic for B and D
P-V diagram of a cyclic process ABCA is as shown in figure. Choose the correct statement
(1) = negative
(2) = positive
(3) = negative
(4) All of these
In the following P-V diagram two adiabatics cut two isothermals at temperatures T1 and T2 (fig.). The value of will be
(1)
(2)
(3)
(4) VbVc
An ideal gas with adiabatic exponent undergoes a process in which work done by the gas is same as increase in internal energy of the gas. The molar heat capacity of gas for the process is –
1.
2.
3.
4.
The molar heat capacity for an ideal gas
1. cannot be negative
2. must be equal to either or
3. must lie in the range
4. may have any value between and
An ideal gas expands according to the law = const. The molar heat capacity C is :
1.
2.
3.
4.