First and Second Laws of Thermodynamics NEET Questions

Physics - Thermodynamics

First and Second Laws of Thermodynamics MCQ Questions


7.
Which of the following statements is meaningless according to NCERT?
A.
'A gas in a given state has a certain amount of heat'
B.
'A gas in a given state has a certain amount of internal energy'
C.
'A certain amount of heat is supplied to the system'
D.
'A certain amount of work was done by the system'
😑 View Answer Rough Work Error
ANSWER :
A. 'A gas in a given state has a certain amount of heat'
8.
The two ways of changing the internal energy of a gas in a cylinder with a movable piston are:
A.
Changing temperature and changing mass
B.
Changing pressure and changing volume
C.
Adding more gas molecules and removing some
D.
Supplying heat (from temperature difference) and doing work (by mechanical means such as pushing piston)
😑 View Answer Rough Work Error
ANSWER :
D. Supplying heat (from temperature difference) and doing work (by mechanical means such as pushing piston)
9.
NCERT distinguishes heat from work as two distinct modes of energy transfer. Heat (ΔQ) differs from work (ΔW) because:
A.
Work always increases temperature; heat may or may not
B.
Heat flows only in liquids; work only in gases
C.
Heat is energy transfer due to temperature difference; work is energy transfer by mechanical means that do NOT involve a temperature difference
D.
Heat increases temperature while work does not
😑 View Answer Rough Work Error
ANSWER :
C. Heat is energy transfer due to temperature difference; work is energy transfer by mechanical means that do NOT involve a temperature difference
10.
The First Law of Thermodynamics is stated as:
A.
ΔQ = ΔW − ΔU
B.
ΔQ = ΔU × ΔW
C.
ΔQ = ΔU − ΔW
D.
ΔQ = ΔU + ΔW
😑 View Answer Rough Work Error
ANSWER :
D. ΔQ = ΔU + ΔW
11.
In the First Law ΔQ = ΔU + ΔW, the sign convention followed in NCERT is:
A.
All quantities are always positive
B.
ΔQ > 0: heat supplied to system; ΔW > 0: work done BY system on surroundings
C.
ΔQ > 0: heat removed; ΔW < 0: work done by system
D.
ΔQ > 0: heat removed from system; ΔW > 0: work done on system
😑 View Answer Rough Work Error
ANSWER :
B. ΔQ > 0: heat supplied to system; ΔW > 0: work done BY system on surroundings
12.
The First Law of Thermodynamics is described in NCERT as:
A.
The general law of conservation of energy applied to any system in which energy transfer from or to surroundings is taken into account
B.
Only applicable to ideal gases
C.
Only applicable to reversible processes
D.
A new law unique to thermodynamics with no parallel in mechanics
😑 View Answer Rough Work Error
ANSWER :
A. The general law of conservation of energy applied to any system in which energy transfer from or to surroundings is taken into account