Thermodynamics NDA Questions

NDA Chemistry

Thermodynamics MCQ Questions


1.
What are the two different conditions of Measurement?
A.
Solid Liquid
B.
Constant volume, qV Constant pressure, qp
C.
Oxygen Hydrogen
D.
Copper Gold
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ANSWER :
B. Constant volume, qV Constant pressure, qp
2.

If water vapour is assumed to be a perfect gas, molar enthalpy change for vaporisation of 1 mol of water at 1 bar and 100°C is 41kJ mol–1. Calculate the internal energy change, when 1 mol of water is vapourised at 1 bar pressure and 100°C.

A.

393.66 L atm

B.

37.904 kJ mol–1

C.

q = – w = pex (10 – 2) = -8 litre-atm

D.

∆H =UA– UB

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ANSWER :

B. 37.904 kJ mol–1

3.
Two litres of an ideal gas at a pressure of 10 atm expands isothermally at 25 °C into a vacuum until its total volume is 10 litres. How much heat is absorbed and how much work is done in the expansion ?
A.
q = – w = pex (10 – 2) = 0(8) = 0
B.
q = – w = pex (87 – 28) = 2(59) = 118
C.
q = – w = pex (10 – 2) = 2(8) = 16
D.
q = – w = pex (10 – 2) = -8
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ANSWER :
A. q = – w = pex (10 – 2) = 0(8) = 0
4.
External pressure is ______ which is greater than p, piston is moved inward till the pressure inside becomes equal to P ex.
A.
Br
B.
Vi
C.
Pi
D.
P ex
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ANSWER :
D. P ex
5.
A molar property ______ is the value of an extensive property χ of the system for 1 mol of the substance.
A.
χU
B.
χq
C.
χm
D.
χk
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ANSWER :
C. χm
6.
A system in thermodynamics refers to the _____________ and remaining universe constitutes the surroundings.
A.
Part of Universe
B.
Parts of Machinery
C.
Parts of Body
D.
Parts of Fuels
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ANSWER :
A. Part of Universe