Thermodynamics Test

Result

Thermodynamics Test - 57

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

For which combination of working temperatures the efficiency of Carnot’s engine is highest?

A
80 K, 60 K

B
100 K, 80 K

C
60 K, 40 K

D
40 K, 20 K

Solution
Question 2
4 / -1

The efficiency of Carnot engine when source temperature is T₁ and sink temperature is T₂ will be

A

B

C

D
Question 3
4 / -1

in a mechanical refrigerator, the low temperature coils are at a temperature of – 23°C and the compressed gas in the condenser has a temperature of 27°C. The theoretical coefficient of performance is

A
5

B
8

C
6

D
6.5

Solution
Question 4
4 / -1

If heat Q is added reversibly to a system at temperature T and heat Q’ is taken away from it reversibly at temperature T’, then which one of the following is correct?

A

B

C

D
Question 5
4 / -1

The efficiency of Carnot’s heat engine is 0.5 when the temperature of the source is T₁ and that of sink is T₂. The efficiency of another Carnot’s heat engine is also 0.5. The temperature of source and sink of the second engine are respectively

A

B

C

D

Solution
Question 6
4 / -1

A Carnot cycle has the reversible processes in the following order

A
Isothermal expansion, adiabatic expansion, isothermal compression and adiabatic compression

B
Isothermal compression, adiabatic expansion, isothermal expansion and adiabatic compression

C
Isothermal expansion, adiabatic compression, isothermal compression and adiabatic expansion

D
Adiabatic expansion, isothermal expansion, adiabatic compression and isothermal compression
Question 7
4 / -1

A refrigerator with coefficient of performance 1/3 releases 200 J of heat to a hot reservoir. Then, the work done on the working substance is

A

B

C

D

Solution
Question 8
4 / -1

A
372K and 310K

B
372K and 330K

C
330 K and 268 K

D
310 K and 248 K

Solution
Question 9
4 / -1

200 cal of heat is given to a heat engine so that it rejects 150 cal of heat, if source temperature is 400 K, then the sink temperature is

A
300 K

B
200 K

C
100 K

D
50 K

Solution
Question 10
4 / -1

A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K. It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be

A
Efficiency of Carnot engine cannot be made larger than 50%

B
1200 K

C
750 K

D
600 K

Solution