Month: July 2022

(a)  100 J                                  (b)  300 J (c)   500 J                                  (d)  700 J Answer-c (14)

T1 and sink temperature is T2 will be (a) (T1 –  T2)/ T1                                        (b) (T2 –T1 )/T2 (c) (T1 –  T2)/ T2    …

(a)  80 K, 60 K                                  (b)  100 K, 80 K (c)   60 K, 40 K                                 (d) 40 K, 20 K Answer-d (12)

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

3×106 cal. of heat from a reservoir at 627°C, and gives it to a sink at 27°C. The work done by the engine is (a) 4.2×106 J                            …

(a)  Second law of thermodynamics            (b)  Conservation of momentum (c)   Conservation of mass            (d)  First law of thermodynamics Answer-a (9)

(a) Prevent radiation            (b)  Find ideal sources (c)   Reach absolute zero temperature            (d)  Eliminate friction Answer-c (7)

(a)  200 K                                         (b)  400 K (c)   600 K                                       (d)  800 K Answer-b (7)

(a) 1.73 : 1                                      (b)  1 : 1.73 (c)   1 : 1                                         (d)  1 : 2 Answer-b (6)

(a) It is impossible                         (b)  It is possible but less probable (c)   It is quite probable (d)  Data are incomplete Answer-a (7)

(a)  1000 K                                       (b)  960 K (c)   846 K                                       (d) 754 K Answer-b (6)

(a)  Isobaric                              (b)  Isotropy (c)   Enthalpy                            (d)  Entropy Answer-d (9)

(a)  1/3                                       (b)   2/5 (c)   3/4                                  …

(a)      50%                                           (b)  24% (c)   0.75%                                          (d)  0.4% Answer-a (2)

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 / η2 (a)  0.577                                         (b)  0.733 (c)   0.638                          …

(a)   300 K                                         (b)  400 K (c)   500 K                                         (d)  700 K Answer-a (3)

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

(a) T2 =273K                      (b) T2 =0 K (c)  T1 =273K                      (d)   T1 =0 K Answer-b (5)

(a)  127°C                              (b) 227°C (c)    327°C                              (d) 673°C Answer-b (6)

6 × 104 J at high temperature. The amount of heat converted into work is …. (a)  4.8 × 104 J                     (b) 3.5 × 104 J (c)   1.6 × 104 J                       (d) 1.2 × 104 J Answer-d (6)

(a)  Zero (b)  Equal to heat given to the system (c)   More than the heat given to system (d)  Independent of heat given to the system Answer-b (12)

  (a)  In the whole cycle of the system, the loss of any type of heat energy should be zero (b)  That the process should be too fast (c)   That the process should be slow so that the working substance …

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

(a)  Increases                           (b)  Decreases (c)   Remains constant             (d)  Becomes zero Explanation-(c) Internal energy is a state function. (10)

(a)  Room is cooled (b)  Room is heated (c)   Room is either cooled or heated (d)  Room is neither cooled nor heated Explanation-(b) In a refrigerator, the heat dissipated in the atmosphere is more than that taken from the cooling …

(a)  10                                       (b)  1 (c)   9                                         (d)  0 Answer-c (4)

(a)  1800 J/cycle                      (b)  1000 J/cycle (c)   2000 J/cycle                      (d)  1600 J/cycle Answer-d (3)