Home
Class 12
PHYSICS
A perfect gas goes from state A to anoth...

A perfect gas goes from state A to another state B by absorbing 8 x `10^5` J of heat and doing 6.5 x `10^5` J of external work. It is now transferred between the same two states in another process in which it absorbs `10^5` J of heat. Then in the second process,

A

work done on gas is `10^(5)` J

B

work done on gas is `0.5 xx 10^(5) ` J

C

work done by gas is `10^(5) `J

D

work done by gas is `0.5 xx 10^(5) `J

Text Solution

Verified by Experts

The correct Answer is:
b
`dU = dQ - dW = 8 xx 10^(5) - 6.5 xx 10^(5) = 1.5 xx 10^(5) J`.
In the 2nd process, dU remains the same.
` :. dW = dQ - dU = 10^(5) - 1.5 xx 10^(5) = - 0.5 xx 10^(5) J`
Negative sign shows that work is done on the gas.
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    MTG-WBJEE|Exercise WB JEE WORKOUT ( CATEGORY 2 : Single Option Correct Type (2 Mark )|15 Videos

  • THERMODYNAMICS

    MTG-WBJEE|Exercise WB JEE WORKOUT ( CATEGORY 3 : One or Mare than One Option Correct Type (2 Mark )|10 Videos

  • SOLID STATE ELECTRONS

    MTG-WBJEE|Exercise WB JEE Previous Years Questions (CATEGORY 1 : Single Option Correct Type)|15 Videos

  • WAVE OPTICS

    MTG-WBJEE|Exercise WB JEE PREVIOUS YEARS QUESTION (MCQ.s)|9 Videos

Similar Questions

Explore conceptually related problems

A perfect gas goes from a state A to another state B by absorbing 8 × 105 J of heat and doing 6.5 × 105 J of external work. It is now transferred between the same two states in another process in which it absorbs 105 J of heat. In the second process

A certain mass of is taken from an initial thermodynamics state A to another state B by process I and II. In process I for the gas does 5 J of work and absorbs 4 J of heat energy. In process II, the gas absorbs 5 J of heat. The work done by the gas in process II is

A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse process of B to A:

A gas expends from 1.5 to 6.5 L against a constant pressure of 0.5 atm and during this process the gas also absorbs 100 J of heat. The change in the internal energy of the gas is

When a gas is taken from one state a to another state b via one path, it absorbs 25 calories of heat while doing 70J of work. How much heat much heat has to be supplied in taking the same gas from state a to state b via another path when it performs 200J of work?

A gas undergoes a change of state during which 100J of heat is supplied to it and it does 20J of work. The system is brough back to its original state through a process during which 20 J of heat is released by the gas. What is the work done by the gas in the second process?

When a system goes from state A to state B, it is supplied with 400 J of heat and it does 100 J of work. (a) For this transition, what is the system's change in internal energy? (b) If the system moves from B to A, what is the change in internal energy? (c) If in moving from A to B along a different path in which W_(AB)^'=400J of work is done on the system, how much heat does it absorb?

In changing the state of a gas adiabatically from an equilibrium state A to another equilibrium state B an amount of work equal to 22.3 J is done on the system.If the gas is taken from state A to B via a process in which the net heat absorbed by the system is 9.35 cal then the net work done by the system in latter case is (Take 1 case =4.2 J)