Thermodynamics Test

Result

Thermodynamics Test - 71

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following is correct in terms of increasing work done for the same initial and final state?

A
Adiabatic < Isothermal < Isobaric

B
Isobaric < Adiabatic < Isothermal

C
Adiabatic < Isobaric < Isothermal

D
None of the above

Solution
Question 2
4 / -1

A sample of gas expands from volume V₁ to V₂. The amount of work done by the gas is greatest when the expansion is

A
Isothermal

B
Isobaric

C
Adiabatic

D
Equal in all cases
Question 3
4 / -1

How much work to be done in decreasing the volume of an ideal gas by an amount of 2.4 × 10^–4 m³ at normal temperature and constant normal pressure of 1 × 10⁵ N/m² ?

A
28 J

B
27 J

C
25 J

D
24 J

Solution
Question 4
4 / -1

Entropy of a thermodynamic system does not change when this system is used for

A
Conduction of heat from a hot reservoir to a cold reservoir

B
Conversion of heat into work isobarically

C
Conversion of heat into internal energy isobarically

D
Conversion of work into heat isobarically
Question 5
4 / -1

Which relation is correct for isometric process?

A
∆Q = ∆U

B
∆W = ∆U

C
∆Q = ∆W

D
None of these

Solution
Question 6
4 / -1

Which is incorrect ?

A
In an isobaric process, ∆P = 0

B
In an isochoric process, ∆W = 0

C
In an isothermal process, ∆T = 0

D
In an isothermal process, ∆Q = 0
Question 7
4 / -1

A Carnot engine working between 300 K and 600 K has work output of 800 J per cycle. What is amount of heat energy supplied to the engine from source per cycle?

A
1800 J/cycle

B
1000 J/cycle

C
2000 J/cycle

D
1600 J/cycle

Solution
Question 8
4 / -1

If the door of a refrigerator is kept open, then which of the following is true?

A
Room is cooled

B
Room is heated

C
Room is either cooled or heated

D
Room is neither cooled nor heated
Question 9
4 / -1

The efficiency of Carnot\'s engine operating between reservoirs, maintained at temperatures 27°C and –123°C, is

A
50%

B
24%

C
0.75%

D
0.4%

Solution
Question 10
4 / -1

A scientist says that the efficiency of his heat engine which operates at source temperature 127°C and sink temperature 27°C is 26%, then

A
It is impossible

B
It is possible but less probable

C
It is quite probable

D
Data is incomplete

Solution