Thermodynamics MCQ- 04

Q.1 Real gas follows which relation ?

A. PV= nRT

B. PV×compressbility factor = nRT

C. (PV)^n = RT

D. PV^n = C

Ans-: B

Q.2 1 bar is =_______.

A. 1.0197 kgf/cm^2 or 750.06 mm Hg

B. 735.6 mm Hg

C. 100 mm Hg 

D. 1.033 kgf/cm^2 or 760 mm Hg

Ans-: A

Q.3 According to james law ____.

A. Q = W/J

B. W = Q/J

C.  J = Q/W

D. W = J/Q 

Ans-: D 

Q.4 At constant pressure, when a liquid boils , the following parameter increases?

A. Enthalpy 

B. Entropy 

C. Temperature 

D. Kinetic energy 

Ans-: B

Q.5 For which process work done is zero ?

A. Constant volume 

B. Free expansion 

C. Throttling 

D. All of the above 

Ans-: D

Q.6 No liquid exists as liquid at ____.

A. Zero temperature 

B. Zero pressure 

C. Vacuum 

D. In space 

Ans-: B

Q.7 Temperature of a gas produced due to ____.

A. It's heating value 

B. Kinetic energy of molecules 

C. Surface tension of molecules 

D. Enthalpy 

Ans-: A

Q.8 According to Gay- lussac law, for a perfect gas, the absolute pressure of given mass varies directly as ___.

A. Temperature 

B. Pressure 

C. Absolute temp. , if volume is kept constant

D. All of the above 

Ans-: C

Q.9 The smallest quantity ehich take part in a chemical reaction is known as _.

A. Molecule

B. Atom

C. Carbon

D. None of these

Ans-: A

Q.10 The ratio if brake or actual work done to the indicated work done is called ?

A. Relative efficiency 

B. Mechanical efficiency 

C. Total efficiency 

D. Thermal efficiency 

Ans-: B

Q.11 For complete combustion an axcess quantity of air required in order to permit intimate mixing of fuel with oxygen is known as ___.

A. Excess fuel 

B. Excess air 

C. Oxygen 

D. All of the above 

Ans-: B

Q.12 According to Boyle's law ___.

A. PV = 0

B. PV = Constant 

C. PV = 1

D. PV = 1/2

Ans -: B

Q.13 According to first law of thermodynamics total energy of univers remain _______.

A. Constant 

B. Increases

C. Decreases

D. Zero 

Ans-: A

Q.14 In isolated system __.

A. Matter can not interchange 

B. Energy can not interchange 

C. Matter and energy can interchange 

D. A+B

Ans-: D

Q.15 In open system ___.

A. Energy can interchange 

B. Matter can  interchange 

C. A+B 

D. Energy and matter can not interchange 

Ans-: C