TOP 22 IMPORTANT QUATIONs WITH ANSWER OF CLASS 11 - THERMODYNAMICS (MCQs)

TOP 22 IMPORTANT QUATIONs WITH ANSWER OF CLASS 11 - THERMODYNAMICS (MCQs)

Class 11 chemistry MCQs with answers are provided here for chapter 6 Thermodynamics. These MCQs are based on CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practicing these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.


1. A well stoppered thermos flask contains some ice cubes. This is an example of

(a) Closed system

(b) Open system

(c) Isolated system

(d) Non thermodynamics system

Ans: (c)

Solution: It is an isolated system


2. For the reaction C(s) + O2(g) → CO2(g)

(a) △H >△U

(b) △H < △U

(c) △H = △U

(d) None of these

Ans: (c)

Solution: Here △ng RT = 0 , because reactant and product contain same number of gaseous molecules. So that △H = △U + △ng RT ⇒ △H = △U


3. For an ideal gas, CV and CP are related as :

(a) CV – CP = R

(b) CV + CP = R

(c) CP – Cv = RT

(d) CP – Cv = R

Ans: (d) CP – Cv = R

Solution: For an ideal gas, CV and CP are related as CP – Cv = R


4. The least random state of the water system is:

(a) ice

(b) liquid water

(c) steam

(d) randomness is same

Ans: (a)

Solution: The least random state of the water system is ice.


5. Considering entropy(S) thermodynamic parameters the criteria for the spontaneity of any process is:

(a) △S system + △S surroundings > 0

(b) △S system – △S surroundings < 0

(c) △S system > 0

(d) △S surroundings > 0

Ans: (a)

Solution: The criteria for the spontaneity of any process is

△S system + △S surroundings > 0


6. The enthalpy change in a reaction does not depend upon

(a) the state of reactions and products

(b) the nature of the reactants and products

(c) different intermediate steps in the reaction

(d) initial and final enthalpy of the reaction

Ans: (c)

Solution: The enthalpy change is a state function so it doesn’t depend on different intermediate steps in the reaction.


7. The correct relationship between free energy change in a reaction and the corresponding equilibrium constant KC is

(a) -△G = RT lnKC

(b) △G0 = RT lnKC

(c) -△G0 = RT lnKC

(d) △G = RT lnKC

Ans: (c)

Solution : The relationship between free energy change in a reaction and the corresponding equilibrium constant KC is △G0 = – RT lnKC or -△G0 = RT lnKC


8. What is the entropy change (in JK-1 mol-1) when 1 mole of ice is converted into water at 0℃? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol-1 at 0℃)

(a) 20.13

(b) 2.013

(c) 2.198

(d) 21.98

Ans: (d)

Solution: The entropy change; ds = dqrev /T ⇒ ds = 6000J mol-1 / 273K

⇒ ds = 21.978JK-1 mol-1


9. If liquids A and B form an ideal solution

(a) the entropy of mixing is zero

(b) the free energy of mixing is zero

(c) the free energy as well as the entropy of mixing are zero

(d) the enthalpy of mixing is zero


Ans: (d)

Solution: If liquids A and B form an ideal solution the enthalpy of mixing is zero


10. When water is added to quick lime the reaction is

(a) Explosive

(b) endothermic

(c) exothermic

(d) photochemical

Ans: (c)

Solution: When water is added to quick lime the reaction is exothermic

CaO + H2O → Ca(OH)2 △H = -ve


11. What is thermodynamics?

a) study of the relationship between heat and other forms of energy

b) study of the conversion of chemical energy to other forms of energy

c) study of the relationship between mechanical energy to other forms of energy

d) study of the conversion of mechanical energy to other forms of energy

Answer: a


12. Which of the following is an application of thermodynamics?

a) Refrigerators

b) Gas compressors

c) Power plants

d) All of the mentioned

Answer: c


13. Which of the following is a type of thermodynamic system?

a) Open system

b) Closed system

c) Thermally isolated system

d) All of the mentioned


Answer: d


14. Which of the following occurs without a change in the internal energy?

a) Isochoric process

b) Isenthalpic process

c) Steady-state process

d) Isenthalpic process


Answer: c


15. Which of the following thermodynamic law gives the concept of enthalpy?

a) First law of thermodynamics

b) Second law of thermodynamics

c) Third law of thermodynamics

d) Fourth law of thermodynamics


Answer: c


16. What is the value of the absolute thermodynamic temperature scale?

a) 3K

b) 0K

c) 1K

d) 4K


Answer: b

17. If a piston/cylinder with a cross-sectional size of 0.01 m2 is resting on the stops, what should the water pressure be to lift the piston with an outside pressure of 100 kPa?

a) 218kPa

b) 168kPa

c) 198kPa

d) 318kPa


Answer: c


18. At 100°C, a sealed rigid vessel with a volume of 1 m3 and 2 kg of water has a volume of 1 m3. The vessel has now been warmed up. What pressure should a safety pressure valve be adjusted to achieve a maximum temperature of 200°C if one is installed?

a) 431.3 kPa

b) 231.3 kPa

c) 831.3 kPa

d) 131.3 kPa


Answer: a


19. When the diver is 8 meters below the surface, the pressure gauge on his air tank reads 60 kPa. The gauge pressure will be 0 at what depth?

a) 44.118 m

b) 24.118 m

c) 34.118 m

d) None of the mentioned


Answer: b


19. Which of the following is the standard fixed point of thermometry?

a) The steam point

b) The triple point of water

c) The ice point

d) All of the mentioned


Answer: b


20. Which of the following is the standard fixed point of thermometry?

a) The steam point

b) The triple point of water

c) The ice point

d) All of the mentioned


Answer: b


21. Which of the following gives the Mechanical efficiency of the engine?

a) IP/BP

b) 1/(BP*IP)

c) (BP*IP)

d) BP/IP


Answer: d


22. Rate of energy increase within the control volume is given by

a) rate of energy inflow * rate of energy outflow

b) rate of energy inflow – rate of energy outflow

c) rate of energy inflow / rate of energy outflow

d) rate of energy inflow + rate of energy outflow


Answer: b

MORE LINKS-

https://techmechknowledge.blogspot.com/2022/01/atd-advanced-technology-demostration.html

https://techmechknowledge.blogspot.com/2020/10/mcqs-on-renewable-energy-technologies.html

https://techmechknowledge.blogspot.com/2020/10/emerging-trend-in-mechanical-engg.html

https://techmechknowledge.blogspot.com/2020/10/mcq-on-industrial-engineering-and.html


Location: United Kingdom

Comments

Post a Comment

Popular posts from this blog

MCQ on Industrial Engineering and Quality Control (IEQ)

  MCQ on Industrial Engineering and Quality Control (IEQ) Chapter1: Work Study (Method Study and Work measurement) .1 Industrial Engineering: Definition, Need, objectives and scope click hear- https://amzn.to/33iRuqt Easy: Based on definition 1) Which of the following is an objective of industrial engineering? a) Improved productivity b) Reduced effective utilisation of workers c) Increased finished good inventory d) Increase time to market Answer: a) Explanation: Other options are contradictory to benefits 2) Preventive maintenance improves a) Material productivity b) Labour productivity c) Machine productivity d) Increased cost of production Answer: c) Explanation: other options not applicable for preventive maintenance Moderate: Based on understanding of concept 3) Which of the following is NOT an example of an input to the production system? a) Area of land b) Labour forces or man hours days c) Volume of material or fluid used d) Time taken to carry out a job Answer: d)  E...
Read more

MCQs on Renewable Energy Technologies (RET - 22661)

click hear- https://amzn.to/33iRuqt Unit1 : Solar Thermal Systems 1. The study of various forms of energy and its conversion from one form to another is called .  a)Energy technology                                  b) Energy science c) Energy.  d) Power 2. is the energy obtained from sources that are essentially inexhaustible. a) Conventional Energy  b) Non-renewable Energy c) Renewable Energy  d) None of these 3. Which of this is (are) a type of Solar Collector(s) ? a) Flat plate collector  b) Cylindrical Parabolic c) Paraboloid mirror arrays  d) All of these 4. is provided at the bottom of tubing to minimize the heat losses by conduction a) Transparent covers  b) Absorber plate b) Thermal insulation  d) Casing 5. are provided at the above of coolant passages for trapping heat received by absorber plate. a) Transparent Cover  b) Absorber plate c) Thermal In...
Read more

ATD-Advanced technology demostration MCQ Unit -3

Q1-Scavenging air in diesel engine means A) Air used for combustion sent under pressure B) Forced air for cooling cylinder C) Burnt air containing products of combustion D) Air used for forcing burnt gases out of engine's cylinder during the exhaust period Answer D Q2-The pressure at the end of compression in the case of diesel engine is of the order of  A 6 kg/cm2  B 12 kg/cm2  C 20 kg/cm2  D 35 kg/cm2  Answer D  Q3- The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will  A Increase  B Decrease  C Be independent  D May increase or decrease depending on other factors   Answer B  Q4-The fuel in diesel engine is normally injected at pressure of A 5-10 kg/cm2  B 20-25 kg/cm2  C 60-80 kg/cm2  D 90-130 kg/cm2  Answer D  Q5-Compression loss in I.C. engines occurs due to   A Leaking piston rings  B Clogged air-inlet slots  C Increase in clea...
Read more