When the amount of work done is 333 cal and change in internal energy is 167 cal, then the heat supplied is -

(1) 166 cal

(2) 333 cal

(3) 500 cal

(4) 400 cal

Concept Questions :-

First law of thermodynamics
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First law thermodynamics states that

(1) System can do work

(2) System has temperature

(3) System has pressure

(4) Heat is a form of energy

Concept Questions :-

First law of thermodynamics
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A thermo-dynamical system is changed from state (P1, V1) to (P2, V2) by two different process. The quantity which will remain same will be

(1) ΔQ

(2) ΔW

(3) ΔQ + ΔW

(4) ΔQ – ΔW

Concept Questions :-

First law of thermodynamics
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If 150 J of heat is added to a system and the work done by the system is 110 J, then change in internal energy will be 

(1) 260 J

(2) 150 J

(3) 110 J

(4) 40 J

Concept Questions :-

First law of thermodynamics
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If ΔQ and ΔW represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as 

(1) ΔQ = ΔU + ΔW

(2) ΔQ = ΔU – ΔW

(3) ΔQ = ΔW – ΔU

(4) ΔQ = –ΔU – ΔW

where ΔU is the internal energy

Concept Questions :-

First law of thermodynamics
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Which of the following can not determine the state of a thermodynamic system 

(1) Pressure and volume

(2) Volume and temperature

(3) Temperature and pressure

(4) Any one of pressure, volume or temperature

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Which of the following is not a thermodynamics co-ordinate ?

(1) P

(2) T

(3) V

(4) R

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In a given process for an ideal gas, dW = 0 and dQ < 0. Then for the gas -

(1) The temperature will decrease

(2) The volume will increase

(3) The pressure will remain constant

(4) The temperature will increase

Concept Questions :-

First law of thermodynamics
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Which of the following statements is correct for any thermodynamic system ?

(1) The internal energy changes in all processes

(2) Internal energy and entropy are state functions

(3) The change in entropy can never be zero

(4) The work done in an adiabatic process is always zero

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In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules absorb 30 J of heat and 10 J of work is done by the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be -

(1) 30 J

(2) 20 J

(3) 60 J

(4) 40 J

Concept Questions :-

First law of thermodynamics
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