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NCERT Solutions for class 11 Physics | Chapter 12 - Thermodynamics

Questions
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
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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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