Thermodynamics

A. increases
B. decreases
C. remains constant
D. first increases and then decreases
E. first decreases and then increases

A. mass and energy are mutually convertible
B. Carnot engine is most efficient
C. heat and work are mutually convertible
D. mass and light are mutually convertible
E. heat flows from hot substance to cold substance

A. enables to determine change in internal energy of the system
B. does not help to predict whether the system will or not undergo a change
C. does not enable to determine change in entropy
D. provides relationship between heat, work and internal energy
E. all of the above

A. reversible engine
B. irreversible engine
C. new engine
D. petrol engine
E. diesel engine

A. process is thermodynamically in equilibrium
B. process is executed in closed system cycle
C. its entropy will change due to irreversibility
D. sum of heat and work transfer will be zero
E. no work will be done by the system

A. properties of the medium/substance used
B. condition of engine
C. working condition
D. temperature range of operation
E. effectiveness of insulating material around the engine

A. 650°K
B. 600°K
C. 625°K
D. 700°K
E. 750°K

A. justified
B. not possible
C. may be possible with lot of sophistications
D. cost will be very high
E. theroretically possible

A. prevents thermal interaction
B. permits thermal interaction
C. encourages thermal interaction
D. discourages thermal interaction
E. does not exist

Which of the following statements is correct ?
A. The room will be cooled to the temperature inside the refrigerator.
B. The room will be cooled very slightly.
C. The room will be gradually warmed up.
D. The temperature of the air in room will remain unaffected.
E. any one of above is possible depending on the capacity