Work NEET Questions

Physics - Thermodynamics

Work MCQ Questions


1.
In thermodynamics, work done BY the system is defined as:
A.
Change in internal energy alone
B.
Energy transfer brought about by mechanical means (such as moving a piston) that do NOT involve a temperature difference
C.
Total energy content of the system
D.
Heat supplied to the system
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ANSWER :
B. Energy transfer brought about by mechanical means (such as moving a piston) that do NOT involve a temperature difference
2.
Work (ΔW) and heat (ΔQ) in thermodynamics are NOT state variables. Which statement best explains why work is path-dependent?
A.
Work cannot be negative
B.
Work depends only on initial and final states like internal energy
C.
The amount of work done going from state (P₁,V₁) to (P₂,V₂) depends on the path taken — different processes (isothermal, adiabatic, isobaric) between the same endpoints give different work values
D.
Work is always zero for thermodynamic systems
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ANSWER :
C. The amount of work done going from state (P₁,V₁) to (P₂,V₂) depends on the path taken — different processes (isothermal, adiabatic, isobaric) between the same endpoints give different work values
3.
NCERT sign convention for work: ΔW > 0 means:
A.
Work is done BY the system on the surroundings
B.
Heat is supplied to the system
C.
Internal energy decreases
D.
Work is done ON the system by surroundings
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ANSWER :
A. Work is done BY the system on the surroundings
4.
Work done by a gas against constant external pressure P when volume changes by ΔV is:
A.
ΔW = P²ΔV
B.
ΔW = ΔV/P
C.
ΔW = P/ΔV
D.
ΔW = PΔV
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ANSWER :
D. ΔW = PΔV
5.
The work done BY a gas in a process can be calculated from the P-V diagram as:
A.
The product of initial and final pressures
B.
The length of the P-V curve
C.
The slope of the P-V curve
D.
The area under the P-V curve between the initial and final volumes
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ANSWER :
D. The area under the P-V curve between the initial and final volumes
6.
A statement 'a gas in a given state has a certain amount of work' is:
A.
Correct only for adiabatic processes
B.
Correct — work is stored in the gas as potential energy
C.
Correct — work equals internal energy in some processes
D.
Meaningless — work is a mode of energy transfer, not a stored property of a state
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ANSWER :
D. Meaningless — work is a mode of energy transfer, not a stored property of a state