Thermodynamics Questions and Answers – Equations of State of a Gas

«
»

This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Equations of State of a Gas”.

1. A mole of a substance has a mass equal to the molecular weight of the substance.
a) true
b) false
View Answer

Answer: a
Explanation: 1gm of oxygen has mass of 32gm and 1gm of nitrogen has a mass of 28gm and so on.
advertisement

2. According to Avogadro’s law, volume of a g mol of all gases at the pressure of ____ and temperature of ____ is same.
a) 760 mm Hg, 100 degree Celsius
b) 760 mm Hg, 0 degree Celsius
c) 750 mm Hg, 100 degree Celsius
d) 750 mm Hg, 0 degree Celsius
View Answer

Answer: b
Explanation: This is the Avogadro law and these temperature and pressure condition is know as normal temperature and pressure(NTP).

3. At NTP, the volume of a g mol of all gases is(in litres)
a) 22.1
b) 22.2
c) 22.3
d) 22.4
View Answer

Answer: d
Explanation: This comes from the Avogadro’s law.
advertisement
advertisement

4. Which of the following statement is true?
a) number of kg moles of a gas = mass / molecular weight
b) molar volume = total volume of the gas / number of kg moles
c) both of the mentioned
d) none of the mentioned
View Answer

Answer: c
Explanation: Number of moles is in kgmoles and molar volume is in (m^3)/kg mol.

5. The equation of state is a functional relationship between
a) pressure
b) molar or specific volume
c) temperature
d) all of the mentioned
View Answer

Answer: d
Explanation: It is expressed in the form f(p,v,T)=0.
advertisement

6. If two properties (out of p,v,T) of a gas are known, the third can be evaluated.
a) true
b) false
View Answer

Answer: a
Explanation: The third property can be calculated from the equation of state.

7. Which of the following statement is true about a gas?
a) lim(pv) with p tending to 0 is independent of the nature of gas
b) lim(pv) with p tending to 0 depends only on the temperature
c) this holds true for all the gases
d) all of the mentioned
View Answer

Answer: d
Explanation: This is one of the fundamental property for all the gases.
advertisement

8. Universal gas constant is given by
a) lim(pv) / 273.16
b) R
c) 0.083 litre-atm/gmol K
d) all of the mentioned
View Answer

Answer: d
Explanation: Putting the value of lim(pv) = 22.4 litre-atm/gmol we get the value of R.

9. The equation of state of a gas is lim(pv)=RT .
a) true
b) false
View Answer

Answer: a
Explanation: The limit is calculated with p tending to 0 and v is the molar volume here.
advertisement

10. For which of the following gases, does the product (pv) when plotted against p gives depends only on temperature?
a) nitrogen
b) hydrogen
c) air and oxygen
d) all of the mentioned
View Answer

Answer: d
Explanation: It is a fundamental property of gas that lim(pv) with p tending to 0 is independent of the nature of gas and depends only on the temperature.

Sanfoundry Global Education & Learning Series – Thermodynamics.
To practice all areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and Answers.

Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

advertisement
advertisement
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Youtube | Instagram | Facebook | Twitter