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2022

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Directions  : Read the following information and answer the questions given below it Six students A, B, C, D, E and F are sitting in the field. A and B are from Nehru House while the rest belong to Gandhi House. D and F are tall while the others are short. A, C and D are wearing glasses while the others are not.

Directions  : Read the following information and answer the questions given below it Six students A, B, C, D, E...

Q. In a cricket season, India defeated Australia twice, West Indies defeated India twice, Australia defeated West Indies twice, India defeated New Zealand twice, and West Indies defeated New Zealand twice. Which country has lost most number of times?

Q. In a cricket season, India defeated Australia twice, West Indies defeated India twice, Australia defeated West Indies twice, India...

Directions : Study the following information and answer the questions given below it: (i) Kailash, Govind and Harinder are intelligent. (ii) Kailash, Rajesh and Jitendra are hard-working. (iii) Rajesh, Harinder and Jitendra are honest. (iv) Kailash, Govind and Jitendra are ambitious.

Directions : Study the following information and answer the questions given below it: (i) Kailash, Govind and Harinder are intelligent....

Madan and Rohit are in the same team of hockey. Parth defeated Rohit in badminton but lost to Sachin in tennis. Nitin teams with Sagar in football and with Sachin in hockey. Rohit defeated Sachin in chess. Those who play cricket do not play badminton, volleyball or tennis. Madan and Parth are in opposite teams of basketball. Nitin represents his state in cricket while Sagar does so at the district level. Boys who play chess do not play football, basketball or volleyball. Madan and Parth are together in the volleyball team. Boys who play football also play hockey.

Directions Study the following information carefully to answer the given questions: Madan and Rohit are in the same team of...

29. An ideal heat engine working between temperature

T1­ and T2 has an efficiency η, the new efficiency if both the source and sink temperature are doubled, will...

Ravi and Kunal are good in Hockey and Volleyball. Sachin and Ravi are good in Hockey and Baseball. Gaurav and Kunal are good in Cricket and Volleyball.

Directions : Read the following information carefully and answer the question given below: ਹੇਠ ਲਿਖੀ ਜਾਣਕਾਰੀ ਨੂੰ ਧਿਆਨ ਨਾਲ ਪੜ੍ਹੋ...

11. A Carnot’s engine used first an ideal monoatomic gas then an ideal diatomic gas. If the source and sink temperature are 411°C  and 69°C   respectively and the engine extracts 1000 J of heat in each cycle, then area enclosed by the PV diagram is 

(a)  100 J                                  (b)  300 J (c)   500 J                                  (d)  700 J Answer-c (15)

13. The temperature of sink of Carnot engine is 27°C. Efficiency of engine is 25%. Then temperature of source is

(a)  227°C                                        (b) 327°C (c) 127°C                             ...

28. The efficiency of Carnot engine when source temperature is

T1 and sink temperature is T2 will be (a) (T1 –  T2)/ T1               ...

27. For which combination of working temperatures the efficiency of Carnot’s engine is highest

(a)  80 K, 60 K                                  (b)  100 K, 80 K (c)   60 K, 40 K           ...

26. The first operation involved in a Carnot cycle is

(a)  Isothermal expansion           (b)  Adiabatic expansion (c)  Isothermal compression       (d)   Adiabatic compression Answer-a (22)

25. A Carnot engine takes

3×106 cal. of heat from a reservoir at 627°C, and gives it to a sink at 27°C. The work done...

24. “Heat cannot by itself flow from a body at lower temperature to a body at higher temperature” is a statement or consequence of

(a)  Second law of thermodynamics            (b)  Conservation of momentum (c)   Conservation of mass            (d)  First law of thermodynamics...

23. Even Carnot engine cannot give 100% efficiency because we cannot

(a) Prevent radiation            (b)  Find ideal sources (c)   Reach absolute zero temperature            (d)  Eliminate friction Answer-c (8)

22. Efficiency of a Carnot engine is 50% when temperature of outlet is 500 K. In order to increase efficiency up to 60% keeping temperature of intake the same what is temperature of outlet 

(a)  200 K                                         (b)  400 K (c)   600 K                       ...

21. A Carnot’s engine is made to work between 200°C and 0°C first and then between 0°C and –200°C. The ratio of efficiencies of the engine in the two cases is

(a) 1.73 : 1                                      (b)  1 : 1.73 (c)   1 : 1                 ...

20. A scientist says that the efficiency of his heat engine which operates at source temperature 127°C and sink temperature 27°C is 26%, then

(a) It is impossible                         (b)  It is possible but less probable (c)   It is quite probable (d)  Data are...

19. A carnot engine has the same efficiency between 800 K to 500 K and x K to 600 K. The value of x is

(a)  1000 K                                       (b)  960 K (c)   846 K                       ...

18. A measure of the degree of disorder of a system is known as

(a)  Isobaric                              (b)  Isotropy (c)   Enthalpy                            (d)  Entropy Answer-d (10)

17. A Carnot engine operates between 227°C and 27°C Efficiency of the engine will be

(a)  1/3                                     ...

16. The efficiency of Carnot’s engine operating between reservoirs, maintained at temperatures 27°C  and -123°C is

(a)      50%                                           (b)  24% (c)   0.75%                             ...

15. In a Carnot engine, when

T2=0°C  and T1=200°C  its efficiency is η1 and when T1=0°C  and T2=200°C , Its efficiency is η2 , then what is η1...

14. The temperature of reservoir of Carnot’s engine operating with an efficiency of 70% is 1000K. The temperature of its sink is

(a)   300 K                                         (b)  400 K (c)   500 K                       ...

12. A Carnot engine absorbs an amount Q of heat from a reservoir at an abosolute temperature T and rejects heat to a sink at a temperature of T/3. The amount of heat rejected is

(a)  Q / 4                                   (b)  Q / 3 (c)   Q / 2                                   (d)  2Q / 3 Answer-b (3)

14. Which of the following is a slow process

(a) Isothermal                          (b)  Adiabatic (c)   Isobaric                              (d)  None...

16. A Container having 1 mole of a gas at a temperature

27°C has a movable piston which maintains at constant pressure in container of 1 atm. The gas is compressed until...

10. Efficiency of Carnot engine is 100% if

(a) T2 =273K                      (b) T2 =0 K (c)  T1 =273K                      (d)   T1...

9. An ideal heat engine exhausting heat at 77°C is to have a 30% efficiency. It must take heat at

(a)  127°C                              (b) 227°C (c)    327°C                              (d) 673°C Answer-b (7)

8. An ideal gas heat engine operates in a Carnot’s cycle between 227°C and 127°C.It absorbs

6 × 104 J at high temperature. The amount of heat converted into work is …. (a)  4.8 × 104 J...

7. In a cyclic process, work done by the system is

(a)  Zero (b)  Equal to heat given to the system (c)   More than the heat given to system (d)  Independent...

6. For a reversible process, necessary condition is

  (a)  In the whole cycle of the system, the loss of any type of heat energy should be zero...

5. Irreversible process is

(a)      Adiabatic process (b)  Joule-Thomson expansion (c)   Ideal isothermal process (d)  None of the above Answer-b (13)

4. In a cyclic process, the internal energy of the gas

(a)  Increases                           (b)  Decreases (c)   Remains constant             (d)  Becomes zero Explanation-(c) Internal energy is a state function. (12)

3. If the door of a refrigerator is kept open, then which of the following is true

(a)  Room is cooled (b)  Room is heated (c)   Room is either cooled or heated (d)  Room is neither cooled...

2. The coefficient of performance of a Carnot refrigerator working between 30°C and 0°C is

(a)  10                                       (b)  1 (c)   9                                         (d)  0 Answer-c (5)

1. A Carnot engine working between 300K and 600K has work output of 800 J per cycle. What is amount of heat energy supplied to the engine from source per cycle

(a)  1800 J/cycle                      (b)  1000 J/cycle (c)   2000 J/cycle                      (d)  1600 J/cycle Answer-d (4)

23. Which relation is correct for isometric process

(a)  ΔQ =    ΔU                            (b)    ΔW =   ΔU (c)    ΔQ =   ΔW                           (d) ...

22. Which is incorrect

(a)  In an isobaric process, ΔP =0 (b)  In an isochoric process, ΔW = 0 (c)   In an isothermal process,...

21. In an isochoric process

if  T1 = 270C and T2 = 1270C , then P1/P2 will be equal to (a)  9 / 59                                 (b) ...

20. In which thermodynamic process, volume remains same

(a)  Isobaric                   (b)  Isothermal (c)  Adiabatic                (d)  Isochoric Ans. d (7)
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