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NCERT Solutions for class 11 Physics | Chapter 12 - Thermodynamics

Free download in PDF Class 11 Physics Chapter 12 Thermodynamics Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) A gas expands from 1 litre to 3 litre at atmospheric pressure. The work done by the gas is about
[A] 200 J
[B] 2 J
[C] 300 J
[D] 400 j
Answer: 200 J
(2) A uniform metal rod is used as a bas pendulum. If the room temperature rises by 10C and the efficient of line as expansion of the metal of the rod is, 2×10-6 0-1 Cwhat will have percentage increase in the period of the pendulum ?
[A] -2×10-3
[B] 1×10-3
[C] -1×10-3
[D] 2×10-3
Answer: 1×10-3
(3) A Centigrade and a Fahrenheit thermometers are dipped in boiling water-The water temperature is lowered until the Fahrenheit thermometers registered 140 what is the fall in thermometers
[A] 80
[B] 60
[C] 40
[D] 30
Answer: 40
(4) The temperature of a body on Kelvin Scale is found to be x.K. when it is measured by Fahrenheit thermometers. it is found to be xF, then the value of x is .
[A] 313
[B] 301.24
[C] 574-25
[D] 40
Answer: 574-25
(5) The temperature on Celsius scale is 25 C What is the corresponding temperature on the Fahrenheit Scale?
[A] 40 F
[B] 45 F
[C] 50 F
[D] 77 F
Answer: 77 F
(6) At Which temperature the density of water is maximum?
[A] 4 F
[B] 42 F
[C] 32 F
[D] 39.2 F
Answer: 39.2 F
(7) The temperature of a substance increases by 27°C What is the value of this increase of Kelvin scale?
[A] 30K
[B] 2-46K
[C] 7 K
[D] 27 K
Answer: 27 K
(8) A gas mixture consists of 2 mde of oxygen and 4 mole of argon at tempressure T.Neglecting all vibrational modes, the total internal energy of the system is
[A] 11 RT
[B] 9 RT
[C] 15 RT
[D] 4 RT
Answer: 11 RT
(9) One mole of a monoatomic gas is heate at a constant pressure of 1 atmosphere from 0k to 100 k. If the gas constant R = 8.32 J/mol k the change in internal energy of the gas is approximate ?
[A] 23 J
[B] 1.25×103 J
[C] 8.67× 103 J
[D] 46 J
Answer: 46 J
(10) One mole of a monoatomic ideal gas is mixed with one mole of a diatomic ideal gas The molas specific heat of the micture at constant volume is ____
[A] 4 R
[B] 3 R
[C] R
[D] 2R
Answer: 2R
(11) If du represents the increase in internal energy of a thesmodynamic system and dw the work done by the system, which of the following statement is true ?
[A] du = dw in isothermal process
[B] du = dw in aidabadic process
[C] du = - dw in an aidabadic process
[D] da = - dw in an isothermal process
Answer: du = - dw in an aidabadic process
(12) An engine is supposed to operate between two reservoirs at temperature 727°C and 227°C. The maximum possible efficiency of such an engine is
[A] 3/4
[B] 1/4
[C] 1/2
[D] 1
Answer: 1/2
(13) An ideal refrigerator has a freetes at a temperature of -13°C, The coefficent of perfomance of the engine is 5. The temperature of the air to which heat is rejected will be.
[A] 325°C
[B] 39°C
[C] 325 K
[D] 320°C
Answer: 39°C
(14) An ideal heat engine working between temperature T1 and T2 has an efficiency n. The new efficiency if both the source and sink temperature are doubled, will be
[A] n
[B] 2n
[C] 3n
[D] n/2
Answer: n
(15) For which combination of working temperatures the efficiency of Car not's engine is highest.
[A] 80 K, 60 K
[B] 100 K, 80 K
[C] 60 K, 40 K
[D] 40 K, 20 K
Answer: 40 K, 20 K
(16) A car not engine takes 3×106 cal of heat from a reservoir at 627°C , and gives to a sink at 27°C. The work done by the engine is
[A] 4.2×106 J
[B] 16.8×106 J
[C] 8.4×106 J
[D] Zero
Answer: 8.4×106 J
(17) Efficiency of a car not engine is 50%, when temperature of outlet is 500K. in order to increase efficiency up to 60% keeping temperature of intake the same what is temperature of out let.
[A] 200 K
[B] 400 K
[C] 600 K
[D] 800 K
Answer: 400 K
(18) If the doors of a refrigerators is kept open, then which of the following is true?
[A] Room is cooled
[B] Room is eithers cooled or heated
[C] Room is neither cooled nor heated
[D] Room is heated
Answer: Room is heated
(19) If a heat engine absorbs 2KJ heat from a heat source and release 1.5KJ heat into cold reservoir, then its efficiency is ____
[A] 0.5%
[B] 75%
[C] 25%
[D] 50%
Answer: 25%
(20) The efficiency of heat engine is 30% If it gives 30KJ heat to the heat sink, than it should have absorbed _____ KJ heat from heat source.
[A] 42.8
[B] 39
[C] 29
[D] 9
Answer: 42.8

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