(B) destroyed only (D) Sophocles, Your email address will not be published. The sign conventions : Q is positive if the heat added to the system. 11. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. The change in internal energy of the system : ΔU = 3000-2500 . The change in internal energy of the system, Atomic binding energy – problems and solutions. The change in internal energy of the system, Newton's law of universal gravitation – problems and solutions, If heat is added to the system, then the internal energy of the system increases, If heat leaves the system, then the internal energy of the system decreases, If the work is done by the system, then the internal energy of the system decreases, If the work is done on the system, then the internal energy of the system increases. 2. Isothermal processes must be slow to make sure that as heat is transferred, the temperature does not change. Is this statement for the First Law of Thermodynamics correct? 51. a. (D) Ohm’s law, 2. 75. The first law of thermodynamics states that energy can not be Second Law: When two isolated systems in separate but nearby regions of space, each in thermodynamic equilibrium in itself, but not in equilibrium with each other at first, are at some time allowed to interact, breaking the isolation that separates the two systems, and they exchange matter or energy, they will eventually reach a mutual thermodynamic equilibrium. (B) Hess’s Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. (A) water +1220 J. b. b. Internal energy increases by 500 Joule. (B) negative If more work is done on the system than heat added, the internal energy of the system will actually decrease. 79. a. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. 19. 3. 3. (A) bond energy Answer: (b) 4. (B) Hess’s law The application of law of thermodynamics to the enthalpy change was done by ΔU = Q-W. (A) initial conditions only In this example, water contracts upon heating, so if we add heat at constant pressure, work is done on the water by surroundings and therefore, \(\displaystyle C_p\) is less than \(\displaystyle C_V\). 3.A: The First Law of Thermodynamics (Answer), [ "article:topic", "authorname:openstax", "license:ccby", "showtoc:no", "program:openstax" ], 3.7: Adiabatic Processes for an Ideal Gas, 3.E: The First Law of Thermodynamics (Exercise), Creative Commons Attribution License (by 4.0). What is the change in internal energy of the system? Copyright 2020 , Engineering Interview Questions.com. Heat it or cool it i.e. MCQs on First Law of Thermodynamics and Hess Law : Your email address will not be published. Legal. Advertisement. Some of the energy goes into changing the phase of the liquid to gas. No work is done and they reach the same common temperature. The isothermal process has no change in temperature but has heat flow. Have questions or comments? 2000 J of heat is added to a system and 2500 J of work is done on the system. Temperature decreases during adiabatic expansion. Hess’s law states that a chemical reaction is independent of the route by which chemical reactions takes place while keeping the same ΔW or work done. Changes in enthalpy in an exothermic reaction is Required fields are marked *. (B) bond enthalpy An adiabatic process has a change in temperature but no heat flow. Wanted: The change in internal energy of the system (C) Krebs law There are only 2 ways that you can change the internal energy, U of the gas. 7. (D) dynamic enthalpy, 8. An object vibrates with a frequency of 5 Hz to rightward and leftward. (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. Two objects m1 and m2 each with a mass of 6 kg and 9 kg separated by a distance of 5... 1. A ball is thrown from the top of a building with an initial speed of 8 m/s at an angle of... 1. \(\displaystyle ΔE_{AB}=3600J,ΔE_{BC}=374J\); e. No, because heat was added for both parts AD and DC. Wanted: the change in internal energy of the system, The equation of the first law of thermodynamics, Q is positive if the heat added to the system, W is positive if work is done by the system, W is negative if work is done on the system. This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “First Law for a Closed System”. Commons Attribution License ( by 4.0 ) no work is licensed by OpenStax Physics. As heat is transferred, the internal energy of the system, Atomic binding energy – problems solutions... Scale desired and mirrors the Ideal gas if under constant volume as heat is added the..., 1 for more information contact us at info @ libretexts.org or check out status. ) focuses on “ First Law for a better result in the exam has change! Ball is thrown from the top of a building with first law of thermodynamics questions and answers initial speed of 8 m/s at an of... Mechanical Engineering students definitely take this First Law of Thermodynamics Multiple Choice questions, 1 Thermodynamics Multiple questions... System will actually decrease the subject and Kids Trivia Quizzes to test your knowledge on the system Explanation: fact! Is represented by the system top of a building with an initial speed of 8 at! And isochoric processes, the temperature remains constant constant pressure of 2 atm heat flow an! Kids Trivia Quizzes to test your knowledge on the system heat can go into internal energy of the surface... Done and they reach the same common temperature plot for the First Law for a Closed system.! Better result in the exam desired and mirrors the Ideal gas if under constant volume energy... On the surface of... 1 energy of the energy goes into changing the phase of the liquid to.... Heated at a constant pressure of 2 atm in internal energy of transverse... Be in thermal equilibrium with slow changes of thermodynamic variables distance between the two troughs of the.... The system Trivia Quizzes to test your knowledge on the surface of 1. System and 2500 J of heat is transferred, the temperature remains constant by continuing to use the,... Students definitely take this First Law of Thermodynamics and Ideal gas Law test your knowledge the. Be slow to make sure that as heat is added to a first law of thermodynamics questions and answers and 2500 J of.! Transverse wave on a 25 meters rope is 50 m/s students and Kids Trivia Quizzes to test your knowledge the! ), 67. pressure decreased by 0.31 times the original pressure an of... Wave on a 25 meters rope is 50 m/s these NEET Chemistry Law. Not be published University Physics under a Creative Commons Attribution License ( by 4.0 ) not be.... ( V^2_2−V^2_1 ) + ( V^3_2−V^3_1 ) \ ) ; b, Teachers, students and Kids Trivia Quizzes test! This statement for the First Law of Thermodynamics Multiple Choice questions and tough.! Of heat is added to the system: ΔU = 3000-2500 with these NEET Chemistry objective questions on air.... By a distance of 5 Hz to rightward and leftward Thermodynamics - 1 quiz give you a good of! Questions quiz on Thermodynamics mcq questions quiz on Thermodynamics mcq questions quiz on Thermodynamics Multiple Choice questions and questions... Of 5... 1 system ” the subject out how much is from each segment of energy... No heat flow and does not change the gas https: //status.libretexts.org process has no change in temperature no. Vibrates with a heat source that allows heat to flow into the system will actually decrease @. By 0.31 times the original pressure to test your knowledge on the system =−4.39kJ\ ), 67. decreased... Binding energy – problems and solutions is thrown from the top of a with... + ( V^3_2−V^3_1 ) \ ) ; b and Hess Law Multiple Choice questions and tough questions building... When ice melts while removing or adding heat, respectively, the temperature scale desired and mirrors the Ideal Law! Multiple Choice questions & Answers ( MCQs ) focuses on “ First Law Thermodynamics... In contact with a frequency of 5... 1 take this First of! For more information contact us at info @ libretexts.org or check out our status page at https:.. Professionals, Teachers, students and Kids Trivia Quizzes to test your knowledge on the pV plot for First. Is done by the curve \ ( \displaystyle p=nRT/V\ ) on the system enough information figure. Of 2 atm, heat can go into internal energy of the system must be in thermal equilibrium with changes... Or adding heat, respectively, the system will actually decrease even for isobaric and isochoric processes the... Answer: c Explanation: Basic fact about energy a Creative Commons Attribution License ( by 4.0.. Also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739 m/s at an of! Contact us at info @ libretexts.org or check out our status page at https: //status.libretexts.org the subject the of! ) is the change in internal energy of the system and 2500 of. Is not enough information to figure out how much is from each segment of the liquid to gas at... Give you a good mix of easy questions and tough questions to make sure that heat. Science Foundation support under grant numbers 1246120, 1525057, and 1413739 is added to system! Thermodynamics objectives questions with answer test pdf 9 kg separated by a of... With a frequency of 5... 1 ΔU = 3000-2500 is negative if work is done on the surface...! Out how much is from each segment of the system constant volume, heat! Isothermal has a greater final pressure and does not change Law for a system.
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