Heat NEET Questions

Physics - Thermodynamics

Heat MCQ Questions


1.
Heat in thermodynamics is best defined as:
A.
The total internal energy stored in a body
B.
The kinetic energy of the centre of mass of the system
C.
The potential energy of molecules in a substance
D.
Energy in transit from a body at higher temperature to a body at lower temperature due to temperature difference
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ANSWER :
D. Energy in transit from a body at higher temperature to a body at lower temperature due to temperature difference
2.
Which of the following NCERT statements about heat is correct?
A.
'A gas in a given state has a certain amount of heat' — this is meaningless; heat is not a state property
B.
'A gas in a given state has a certain amount of heat' — this is correct
C.
'Heat and work are both state variables of a system'
D.
'The heat content of a gas equals its internal energy'
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ANSWER :
A. 'A gas in a given state has a certain amount of heat' — this is meaningless; heat is not a state property
3.
The distinction between heat and internal energy is described in NCERT as:
A.
Both heat and internal energy are state functions; they differ in magnitude
B.
Internal energy is heat stored at constant pressure
C.
Heat is energy in transit (a mode of transfer); internal energy is the actual stored energy characterising the state of a system
D.
Heat includes internal energy plus the bulk kinetic energy
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ANSWER :
C. Heat is energy in transit (a mode of transfer); internal energy is the actual stored energy characterising the state of a system
4.
Heat flows from a body at higher temperature to one at lower temperature. The flow stops when:
A.
The pressure of both bodies equalises
B.
The volume of both bodies becomes equal
C.
The density of both bodies is the same
D.
Temperatures equalise — both bodies reach thermal equilibrium
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ANSWER :
D. Temperatures equalise — both bodies reach thermal equilibrium
5.
In thermodynamics, heat (ΔQ) and work (ΔW) are NOT state variables. Which statement correctly explains why?
A.
They are negative quantities by convention
B.
They are always zero for any process
C.
They are path-dependent — the values of ΔQ and ΔW for going from state 1 to state 2 depend on the path taken, not just the endpoints
D.
They cannot be measured accurately
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ANSWER :
C. They are path-dependent — the values of ΔQ and ΔW for going from state 1 to state 2 depend on the path taken, not just the endpoints
6.
NCERT describes heat as 'the energy in transit.' This phrase implies:
A.
Heat exists only during the process of transfer due to temperature difference — it is not stored in any body
B.
Heat transits only in gases
C.
Heat is only transferred through radiation
D.
Heat transfer always increases the temperature of both bodies
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ANSWER :
A. Heat exists only during the process of transfer due to temperature difference — it is not stored in any body