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2022

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28. The mean kinetic energy of a gas at 300 K is 100 J. The mean energy of the gas at 450 K is equal to

(a)   100 J                                          (b)  3000 J (c)   450 J                       ...

26. The translatory kinetic energy of a gas per gm is

(a) (3RT)/(2N)                                     ...

25. The kinetic energy of translation of 20 gm of oxygen at 47°C is (molecular wt. of oxygen is 32 gm/mol and R = 8.3 J/mol/K)

(a)  2490 joules                                (b)  2490 ergs (c)   830 joules                     ...

24. At which of the following temperature would the molecules of a gas have twice the average kinetic energy they have at 20°C

(a) 40°C                                          (b)  80°C (c)   313°C                             ...

23. The kinetic energy per gm mol for a diatomic gas at room temperature is

(a)  3 RT                                           (b) (5/2) RT (c) (3/2)  RT                                  (d) (1/2) RT Answer-b (7)

22. The time average of the kinetic energy of one molecule of a gas taken over a long period of time

(a)  Is proportional to the square root of the absolute temperature of the gas (b) Is proportional to the absolute...

21. A sealed container with negligible coefficient of volumetric expansion contains helium (a monoatomic gas). When it is heated from 300 K to 600 K, the average K.E. of helium atoms is

(a)  Halved                                       (b)  Unchanged (c)  Doubled                             ...

20. Mean kinetic energy (or average energy) per gm molecule of a monoatomic gas is given by

(a)  (3/2)RT                                     ...

19. The average kinetic energy of a gas molecule can be determined by knowing

(a) The number of molecules in the gas (b)  The pressure of the gas only (c)   The temperature of the...

18. According to the kinetic theory of gases, total energy of a gas is equal to

(a)  Potential energy                       (b)  Kinetic energy (c)   Both (a) and (b)                   ...

17. The ratio of mean kinetic energy of hydrogen and nitrogen at temperature 300 K and 450 K respectively is

(a)  3 : 2                                 ...

16. The ratio of mean kinetic energy of hydrogen and oxygen at a given temperature is

(a)  1 : 16                                         (b)  1 : 8 (c)   1 : 4                 ...

15. The average kinetic energy of a gas at – 23°C and 75 cm pressure is

5×10-14 erg for H2 . The mean kinetic energy of the O2  at 227°C and 150 cm pressure will be...

10. If the mean free path of atoms is doubled then the pressure of gas will become

(a)  P/4                                     (b)  P/2 (c)  P/8                             ...

14. If number of molecules of

H2 are double than that of O2 ,  then ratio of kinetic energy of hydrogen and that of oxygen at...

13. For a diatomic gas change in internal energy for unit change in temperature for constant pressure and constant volume is

U1 and U2  respectively. U1:U2 is (a)  5 : 3                     ...

12. The value of universal gas constant is 8.3 J/mole/K, the mean kinetic energy of 32 gm of oxygen at – 73°C will be

(a)  480 J (b)  4980 J (c)   2490 J (d)  The information is incomplete Answer-c (10)

11. Relationship between P,V and E for a gas is

(a) P=(3/2)EV                          (b) V=(3/2)PE (c) PV=(3/2)E     ...

9. In kinetic theory of gases, a molecule of mass m of an ideal gas collides with a wall of vessel with velocity V. The change in the linear momentum of the molecule is

(a)  2mV                                           (b)  mV (c)   – mV                           ...

36. The temperature of argon, kept in a vessel, is raised by at a constant volume. The total heat supplied to the gas is a combination of translational and rotational energies. Their respective shares are

(a)  60% and 40%                   (b)  40% and 60% (c)   50% and 50%                   (d)  100% and 0% Answer-d (7)

7. At a given temperature, the pressure of an ideal gas of density ρ is proportional to             

(a) 1/ρ 2                                   ...

6. The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at

0°C is 3180 metres/second. The pressure on the hydrogen gas is  (Density of hydrogen gas is 8.99×10-2 kg/m3  , 1...

5. A cylinder of capacity 20 litres is filled with

H2 gas. The total average kinetic energy of translatory motion of its molecules 1.5×105 J is . The pressure of...

4. The relation between the gas pressure P and average kinetic energy per unit volume E is

(a) P =(1/2) E                                        (b)  P = E (c) P =(3/2) E               ...

3. A box contains n molecules of a gas. How will the pressure of the gas be effected, if the number of molecules is made 2n

(a)  Pressure will decrease (b)  Pressure will remain unchanged (c)   Pressure will be doubled (d)  Pressure will become three times...

2. Gas at a pressure

P0 in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled,...

1. The pressure exerted by the gas on the walls of the container because

(a) It loses kinetic energy (b)  It sticks with the walls (c)   On collision with the walls there is a...

42. The ratio of specific heat of a mixture of one mole of helium and one mole of hydrogen gas will be

(a)  1                                     ...

48. A gaseous mixture consists of 16g of helium and 16g of oxygen. The ratio

Cp/Cv of the mixture is (a) 1.4                             ...

47. The degrees of freedom of a stationary rigid body about its axis will be

(a)  One                                            (b)  Two (c)   Three                           ...

46. What is the value of 

R/Cp for diatomic gas (a)   3/4                             ...

45. 5 moles of oxygen is heated at constant volume from 10°C to 20°C. The change in the internal energy of the gas is (the gram molecular specific heat of oxygen at constant pressure,  Cp=8 cal/mole °C and R = 8.3 cal/mole °C)        

(a) 200 cal                                       (b)  300 cal (c)   100 cal                     ...

44. If a gas has n degrees of freedom ratio of specific heats of gas is

(a)  (1+n)/2                                            (b) 1+(1/n) (c)  1+(n/2)                        ...

43. For a gas γ=7/5 The gas may probably be

(a)  Helium                                       (b)  Hydrogen (c)   Argon                          ...

41. For a gas if ratio of specific heats at constant pressure and volume is γ then value of degrees of freedom is

(a) (3γ-1)/ (2γ-1)                                          (b) 2/(γ-1) (c)  (9/2)(γ-1)                      ...

40. The value of the gas constant (R) calculated from the perfect gas equation is 8.32 joules/gm mole K, whereas its value calculated from the knowledge of

CP  and Cv  of the gas is 1.98 cal/gm mole K. From this data, the value of J is (a) ...

39. The number of translational degrees of freedom for a diatomic gas is

(a)    2                                   ...

38. The kinetic energy, due to translational motion, of most of the molecules of an ideal gas at absolute temperature T is

(a)  kT                                     ...

37. On giving equal amount of heat at constant volume to 1 mol of a monoatomic and a diatomic gas the rise in temperature (ΔT)  is more for

(a)  Monoatomic                      (b)  Diatomic (c)   Same for both                   (d)  Can not be predicted Answer-a (7)

16. The following sets of values for

Cv and Cp of a gas has been reported by different students. The units are cal/gm-mole-K. Which of these sets...

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