Q.4 If ‘Q’ is the amount of heat supplied to a system and ‘W’ is the work done, then change in internal energy can be defined as
A) Q/W C) W/Q
A) Q/W C) W/Q
B) Q – W D) 1 + Q/W
Q.5 A heat engine operating according to second law of thermodynamics rejects one fourth of the heat taken from high temperature reservoir. What is the percentage efficiency of heat engine?
A) 100% C) 50%
B) 25% D) 75%
Q.6 First law of thermodynamics under adiabatic conditions can be mathematically written as:
A) Q = W C) Q = U + W
B) Q = ∆U D) W = ̶ ∆U
A) 100% C) 50%
B) 25% D) 75%
Q.6 First law of thermodynamics under adiabatic conditions can be mathematically written as:
A) Q = W C) Q = U + W
B) Q = ∆U D) W = ̶ ∆U
Q.7 What is the factor upon which change in internal energy of an ideal gas depends?
A) Change in volume C) Change in temperature
A) Change in volume C) Change in temperature
B) Change in temperature and volume D) Path followed to change internal energy
Q.9 For a heat engine ‘A’ ratio of Q1 to Q2 is 2/3 while that of heat engine ‘B’, ratio of Q2 to Q1 is 1/3. What is the value ηA : ηB?
A) 1:3 C) 2:3
B) 1:2 D) 2:1
A) 1:3 C) 2:3
B) 1:2 D) 2:1