First and Second Laws of Thermodynamics NEET Questions

Physics - Thermodynamics

First and Second Laws of Thermodynamics MCQ Questions


1.
The First Law of Thermodynamics is a statement of:
A.
Conservation of mass
B.
Conservation of heat
C.
Conservation of volume
D.
Conservation of energy
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ANSWER :
D. Conservation of energy
2.
Which of the following processes is impossible according to the second law of thermodynamics?

NEET - 2021

A.
Heat flows from a hot body to a cold body spontaneously
B.
Heat flows from a cold body to a hot body without external work being done
C.
A refrigerator transfers heat from a cold reservoir to a hot reservoir with external work being done
D.
A heat engine converts heat completely into work without any other effect
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ANSWER :
B. Heat flows from a cold body to a hot body without external work being done
3.
Which of the following represents the First Law of Thermodynamics?
A.
ΔU = ΔQ + ΔW
B.
ΔU = ΔW - ΔQ
C.
ΔW = ΔQ + ΔU
D.
ΔQ = ΔU + ΔW
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ANSWER :
D. ΔQ = ΔU + ΔW
4.
In the First Law of Thermodynamics, what does ΔU represent?
A.
Work done on the system
B.
Heat added to the system
C.
Change in temperature
D.
Change in internal energy
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ANSWER :
D. Change in internal energy
5.
The Second Law of Thermodynamics states that:
A.
Heat flows from cold to hot spontaneously
B.
Heat flows from hot to cold spontaneously
C.
Work can be fully converted into heat
D.
Heat cannot be completely converted into work
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ANSWER :
B. Heat flows from hot to cold spontaneously
6.
Which of the following is a correct statement of the second law of thermodynamics?

NEET - 2018

A.
Energy can neither be created nor destroyed
B.
The total entropy of an isolated system can never decrease
C.
The change in internal energy is equal to the heat added minus the work done
D.
The entropy of a system approaches a constant value as the temperature approaches absolute zero
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ANSWER :
B. The total entropy of an isolated system can never decrease