Questions and answers for exam Preparation

MCQs

Total Questions : 1058 | Page 100 of 106 pages

Question 991. First law of thermodynamics

Provides relationship between heat, work and internal energy
Does not enable to determine change in entropy
Enables to determine change in internal energy of the system
All of these

Discuss Question

Answer: Option D. -> All of these

Question 992. Zeroth law of thermodynamics

States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
Deals with heat engines
Deals with reversibility and irreversibility of process
Deals with conversion of mass and energy

Discuss Question

Answer: Option A. -> States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

Question 993. The efficiency of Joule cycle is

Greater than Carnot cycle
Less than Carnot cycle
Equal to Carnot cycle
None of these

Discuss Question

Answer: Option B. -> Less than Carnot cycle

Question 994. A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

114 kJ
84 kJ
54 kJ
30 kJ

Discuss Question

Answer: Option C. -> 54 kJ

Question 995. According to Clausius statement of second law of thermodynamics

Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can
Heat can

Discuss Question

Answer: Option D. -> Heat can

Question 996. When the gas is cooled at constant pressure,

Its temperature increases but volume decreases
Both temperature and volume increases
Its volume increases but temperature decreases
Both temperature and volume decreases

Discuss Question

Answer: Option D. -> Both temperature and volume decreases

Question 997. The specific heat at constant volume is

Any one of the above
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
The amount of heat required to raise the temperature of 1 kg of water through one degree
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

Discuss Question

Answer: Option D. -> The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

Question 998. The ratio of molar specific heats for mono-atomic gas is