This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part I > Class 11 Chemistry (Part I) Chapter 6 Thermodynamics – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 13 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. For a heat engine operating between two temperatures (T2 > T1), what is the maximum efficiency attainable? A) 1-(T1/T2). B) 1-(T12/T2). C) T1-T2. D) 1-(T2/T1). Show Answer Correct Answer: A) 1-(T1/T2). 2. Do molecules generally move faster at 45 C or 106 C? A) 45 C because molecules have more energy than in 106C. B) 106 C because molecules have less energy than in 45C. C) 106 C because molecules have more energy than in 45C. D) 45C because molecules have less energy than in 106 C. Show Answer Correct Answer: C) 106 C because molecules have more energy than in 45C. 3. Is the combustion of gasoline a spontaneous or nonspontaneous process? A) Spontaneous. B) Nonspontaneous. C) All the above. D) None of the above. Show Answer Correct Answer: B) Nonspontaneous. 4. The bond energy (in kcal mol-1) of a C-C single bond is approximately: A) 1. B) 10. C) 83-85. D) 1000. Show Answer Correct Answer: C) 83-85. 5. The system that does not allow the heat to pass through its boundary between the system and surrounding is called as ..... System. A) Isothermal. B) Adiabatic. C) Closed. D) Open. Show Answer Correct Answer: B) Adiabatic. 6. Gas A is in thermal equilibrium with gases B and C. Which of the following is a valid conclusion? A) Thermal equilibrium of gas B is directly proportional to that of gas C. B) Gases A and B have equal amounts of entropy. C) Thermal equilibrium of gas B is indirectly proportional to that of gas C. D) Gases B and C are in thermal equilibrium with each other. Show Answer Correct Answer: D) Gases B and C are in thermal equilibrium with each other. 7. Which is an example of CONDUCTION: A) Wind. B) Burning your arm on the oven. C) Standing by a bonfire. D) None of the above. Show Answer Correct Answer: B) Burning your arm on the oven. 8. What is the primary driving force for reactions at the molecular level? A) Gravitational force. B) Molecular collisions. C) Electromagnetic force. D) Nuclear force. Show Answer Correct Answer: B) Molecular collisions. 9. Exothermic reactions ..... A) Release Color. B) Absorb Color. C) Absorb energy. D) Release energy. Show Answer Correct Answer: D) Release energy. 10. Myra is studying thermodynamics and learns about heat engines. She discovers that a heat engine receives heat from a heat source at 1000 degree Celsius and rejects heat to a sink at 40 degree Celsius. What is the thermal efficiency of the heat engine? A) 75.5%. B) 4%. C) 24.5%. D) 96%. Show Answer Correct Answer: A) 75.5%. 11. Identify the correct statement regarding a spontaneous process: A) Endothermic processes are never spontaneous. B) Lowering of energy in the reaction process is the only criterion for spontaneity. C) For a spontaneous process in an isolated system, the change in entropy is positive. D) Exothermic processes are always spontaneous. Show Answer Correct Answer: C) For a spontaneous process in an isolated system, the change in entropy is positive. 12. Which of the following hardware would be considered a 'closed system'? A) A piston cylinder device. B) A diffuser. C) A nozzle. D) A turbine. Show Answer Correct Answer: A) A piston cylinder device. 13. Aisha is studying thermodynamics and comes across a question about the SI unit of entropy. She wonders what it is. A) KJ/kgK. B) KJ/K. C) KW/K. D) KJ/kg. Show Answer Correct Answer: B) KJ/K. 14. If A has the same temperature as B and C. B and C are in thermal equilibrium. Which law does this refer to? A) 2nd law of thermodynamics. B) 0th law of thermodynamics. C) 3rd law of thermodynamics. D) 1st law of thermodynamics. Show Answer Correct Answer: B) 0th law of thermodynamics. 15. All thermodynamics can be expressed in terms of four quantities, EXCEPT: A) Temperature. B) Internal Energy. C) Luminous Intensity. D) Entropy. Show Answer Correct Answer: C) Luminous Intensity. 16. PCl5(g) + 67 kJ $\rightarrow$ PCl3(g) + Cl2(g) A) Exothermic reaction. B) Endothermic reaction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Endothermic reaction. 17. Heat change at constant pressure is A) H. B) $\Delta$H. C) $\Delta$U. D) U. Show Answer Correct Answer: B) $\Delta$H. 18. ..... is not a state variable A) Heat. B) Temperature. C) Volume. D) Pressure. Show Answer Correct Answer: A) Heat. 19. Which of the following is true for a discharging tank? A) The process is quasi-static. B) The process is adiabatic. C) DQ=0. D) All of the mentioned. Show Answer Correct Answer: D) All of the mentioned. 20. Entropy is a form of energy A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 21. What happens to the internal energy of a system when it performs work on its surroundings without any heat exchange? A) The internal energy becomes zero. B) The internal energy remains constant. C) The internal energy decreases. D) The internal energy increases. Show Answer Correct Answer: C) The internal energy decreases. 22. Conversion of ice cube to water leads to A) Increase in Entropy. B) Decrese in Entropy. C) Remains same. D) None of the above. Show Answer Correct Answer: A) Increase in Entropy. 23. 2N$_{2}$O$_{5}$ $\rightarrow$ 4NO$_{2}$ + O$_{2 }$ $\Delta$H$_{f}$N$_{2}$O$_{5}$ 11.289 kJ/molNO$_{2 }$33.150 kJ/mol$_{}$O$_{2 }$0 kJ/mol $\Delta$Hreaction =? A) 110.022 kJ. B) 21.861 kJ. C) 10.572 kJ. D) 121.311 kJ. Show Answer Correct Answer: A) 110.022 kJ. 24. Someone sits near a fire in a fireplace and becomes warmer. This is an example of: A) Convection. B) Conduction. C) Radiation. D) None of the above. Show Answer Correct Answer: C) Radiation. 25. The area under the temperature-entropy curve (T-s curve) of any thermodynamic process represents A) Heat absorbed. B) Heat rejected. C) Either (a) or (b). D) None of these. Show Answer Correct Answer: C) Either (a) or (b). 26. Myra is trying to understand how a refrigerator works. She learns that it needs to remove heat from a cold body at 5 degree celsius to a surrounding at 35 degree celsius. What is its COP? A) 9. B) 9.3. C) 3. D) 0.93. Show Answer Correct Answer: B) 9.3. 27. Which of the following is the extensive property of a thermodynamic system? A) Pressure. B) Volume. C) Temperature. D) Density. Show Answer Correct Answer: B) Volume. 28. The first law of thermodynamics is basically the same as which law from physics 1? A) Newton's first law. B) Newton's second law. C) The law of conservation of momentum. D) The law of conservation of energy. Show Answer Correct Answer: D) The law of conservation of energy. 29. Which has the MOST thermal energy? A) HUGE iceberg, the size of a small town. B) Ice cube. C) Cup of hot coffee. D) 5 gallon bucket of room temperature water. Show Answer Correct Answer: A) HUGE iceberg, the size of a small town. 30. The more molecules an object contains, the more heat energy it has A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 31. Which law of thermodynamics establishes absolute zero as the temperature at which the entropy of a system is zero? A) 2nd law. B) 1st law. C) 3rd law. D) Zeroth law. Show Answer Correct Answer: C) 3rd law. 32. For a closed system, energy can be transferred across the boundary via heat and work transfer. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 33. Which is a true statement about energy conversion? A) One form of energy cannot be converted into another form of energy. B) Heat can be converted other forms of energy only if caloric is present. C) There is no relationship between heat and work. D) Heat can be converted into other forms of energy. Show Answer Correct Answer: D) Heat can be converted into other forms of energy. 34. What is the term for the measure of disorder or randomness in a system, which tends to increase according to the second law of thermodynamics? A) Equilibrium. B) Enthalpy. C) Entropy. D) Energy. Show Answer Correct Answer: C) Entropy. 35. A(n) ..... is a device for measuring temperature. A) Thermometer. B) Barometer. C) Anemometer. D) Psychrometer. Show Answer Correct Answer: A) Thermometer. 36. What is the term for the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius? A) Enthalpy. B) Heat capacity. C) Thermal conductivity. D) Specific heat capacity. Show Answer Correct Answer: D) Specific heat capacity. 37. What name is given to the process that takes place at constant volume A) Isobaric. B) Isochoric. C) Adiabetic. D) Isothermal. Show Answer Correct Answer: B) Isochoric. 38. Can two isothermal curves cut each other? A) Never. B) Yes. C) They can cut when temperature is 0$^{0}$C. D) Yes, during critical pressure. Show Answer Correct Answer: A) Never. 39. Pressure equal to 2.5 x10$^{5}$ Pa is applied to a gas, causing its volume to change by-2.0x10$^{-3}$ m$^{3}$. How much work is done? A) -5.0x10$^{7}$ J. B) 0 J. C) -500. D) -450 J. Show Answer Correct Answer: C) -500. 40. What is the primary reason that no machine can be 100% efficient according to the second law of thermodynamics? A) Energy is always lost as heat due to friction and other processes. B) Machines are not built perfectly. C) Energy is always conserved. D) Machines require energy to start. Show Answer Correct Answer: A) Energy is always lost as heat due to friction and other processes. 41. What is proportional to internal energy? A) Temperature. B) External Energy. C) Heat. D) Entropy. Show Answer Correct Answer: A) Temperature. 42. J-T effect is an ..... process A) Isoenthalpic. B) Isoentropic. C) Isochoric. D) Isothermal. Show Answer Correct Answer: A) Isoenthalpic. 43. A steam engine takes in 2.254 x 10$^{4}$ kJ from the boiler and gives up 1.915 x 10$^{4}$ kJ in exhaust during one cycle, what is the engine's efficiency? A) 0.85. B) 0.34. C) 1.06. D) 0.15. Show Answer Correct Answer: D) 0.15. 44. Which of the following process is exothermic? A) H2O (l) $\rightarrow$ H2O (g). B) CaCO3 (s) $\rightarrow$ CaO (s) + CO2(g). C) CH4 (g) + 2O2(g) $\rightarrow$ 2H2O(g) + CO2 (g). D) CO2 (s) $\rightarrow$ CO2 (g). Show Answer Correct Answer: C) CH4 (g) + 2O2(g) $\rightarrow$ 2H2O(g) + CO2 (g). 45. Which of the following is true about an isobaric process? A) Pressure is constant. B) No transfer of heat. C) Temperature is constant. D) Volume is constant. Show Answer Correct Answer: A) Pressure is constant. 46. The enthalpy of vaporisation of a substance is 8400 J mol-1 and its boiling point is-173$^\circ$C. The entropy change for vaporisation is: A) 49 J mol-1K-1. B) 84 J mol-1K-1. C) 21 J mol-1K-1. D) 12 J mol-1K-1. Show Answer Correct Answer: B) 84 J mol-1K-1. 47. What is the value of Solar Constant A) 1340 wm$^{-2}$. B) 1.92 cal cm$^{-2}$ min$^{-1}$. C) Both a&b. D) None. Show Answer Correct Answer: C) Both a&b. 48. Quasi-Equilibrium is ..... A) When process proceeds in such a manner that the system remains close to equilibrium state all the time. B) When process proceeds in such a hurry that the system far from equilibrium state. C) When process proceeds in such a manner that the system will far from equilibrium state. D) When process proceeds in such a hurry that the system remains close to equilibrium state all the time. Show Answer Correct Answer: A) When process proceeds in such a manner that the system remains close to equilibrium state all the time. 49. Which law explains the relationship between temperature and entropy? A) Zeroth Law. B) 2nd Law. C) 1st Law. D) 3rd Law. Show Answer Correct Answer: D) 3rd Law. 50. Disorder is more likely than order. Everything trends towards randomness and chaos. Which law does this refer to? A) 3rd law of thermodynamics. B) 0th law of thermodynamics. C) 2nd law of thermodynamics. D) 1st law of thermodynamics. Show Answer Correct Answer: C) 2nd law of thermodynamics. 51. Which of the following statements best describes the second law of thermodynamics? A) In any energy transfer, some energy is lost as heat, increasing entropy. B) Energy cannot be created or destroyed, only transformed. C) Heat flows from a colder body to a hotter body spontaneously. D) The total energy of an isolated system remains constant. Show Answer Correct Answer: A) In any energy transfer, some energy is lost as heat, increasing entropy. 52. Which law of thermodynamics can be referred to as "the arrow of time" ? A) 1st law. B) 3rd law. C) Zeroth law. D) 2nd law. Show Answer Correct Answer: D) 2nd law. 53. Energy associated by virtue of the translational rotational and vibrational motion of the molecules present in it. A) Enthalpy. B) Entropy. C) Heat. D) Internal energy. Show Answer Correct Answer: D) Internal energy. 54. Weather systems in the Earth's atmosphere are due to A) Conduction. B) Convection. C) Radiation. D) None of the above. Show Answer Correct Answer: B) Convection. 55. Work done in a free expansion process is A) Zero. B) Maximum. C) + ve. D) -ve. Show Answer Correct Answer: A) Zero. 56. Work output of a large machine in a factory is 89, 000 Joules, and its input is 102, 000 joules. Work output of a similar machine is 92, 000 joules, and its work input is 104, 000 joules. Which machine has greater efficiency? A) The first machine. B) The second machine. C) Both have the same efficiency. D) Not enough information provided. Show Answer Correct Answer: B) The second machine. 57. If the same amount of thermal energy is transferred to three wooden blocks of different masses (100g, 200g, 300g, 400g) which one would increase in average kinetic energy the fastest? A) 400g. B) 200g. C) 300g. D) 100g. Show Answer Correct Answer: D) 100g. 58. Which law of thermodynamics states that energy cannot be created or destroyed, only transformed from one form to another? A) Second Law of Thermodynamics. B) Third Law of Thermodynamics. C) First Law of Thermodynamics. D) Zeroth Law of Thermodynamics. Show Answer Correct Answer: C) First Law of Thermodynamics. 59. Freezing point of water in Fahrenheit: A) 32. B) 212. C) 100. D) 0. Show Answer Correct Answer: A) 32. 60. For an adiabatic process, which of the following statements is correct? A) Work, heat, and internal energy all undergo changes. B) Work and heat balance each other, so that there is no change in internal energy. C) No energy is transferred as heat; internal energy change is due to work. D) No work is done; internal energy change is due to heat. Show Answer Correct Answer: C) No energy is transferred as heat; internal energy change is due to work. ← PreviousNext →Related QuizzesScience QuizzesClass 11 QuizzesClass 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 1Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 2Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 3Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 4Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 5Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 6Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 7Class 11 Chemistry (Part I) Chapter 6 Thermodynamics Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books