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Physics

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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...

31. What is the ratio of specific heats of constant pressure and

constant volume for NH3 (a)  1.33                                   (b)  1.44 (c)   1.28                                   (d)  1.67 Answer-a (8)

29. The specific heat relation for ideal gas is

(a) Cp+Cv=R                         (b) Cp – Cv=R (c) Cp /Cv=R ...

35. One mole of monoatomic gas and three moles of diatomic gas are put together in a container. The molar specific heat

(in JK-1 mol-1) at constant volume is (R=8.3JK-1 mol-1 ) (a)  18.7                       ...

34. A gaseous mixture contains equal number of hydrogen and nitrogen molecules. Specific heat measurements on this mixture at temperatures below 100 K would indicate that the value of γ (ratio of specific heats) for this mixture is

(a)   3/2         (b)   4/3 (c)   5/3         (d)    7/5 Answer-c (63)

33. One mole of ideal monoatomic gas

[γ=(5/3)]  is mixed with one mole of diatomic gas [γ=(5/3)].  What is γ  for the mixture? γ denotes the ratio...

32. If two moles of diatomic gas and one mole of mono atomic gas are mixed then the ratio of specific heats is

(a) 7/3                                     ...

30. The specific heat of 1 mole of an ideal gas at constant pressure30. The specific heat of 1 mole of an ideal gas at constant pressure

(Cp)  and at constant volume (Cv)  which is correct (a)  Cp of hydrogen gas is (5/2)R (b)  Cv of hydrogen...

28. The quantity of heat required to raise one mole through one degree Kelvin for a monoatomic gas at constant volume is

(a)  (3/2)R                                   (b) (5/2)R...

27. For a gas the difference between the two specific heats is 4150 J/kg K. What is the specific heats at constant volume of gas if the ratio of specific heat is 1.4

(a) 8475 J/kg K                                (b) 5186J/kg K (c) 1660 J/kg K               ...

26. For hydrogen gas

Cp-Cv=a . and for oxygen gas Cp-Cv=b . So the relation between a and b is given by (a) a=16b ...

25. In gases of diatomic molecules, the ratio of the two specific heats of gases

Cp/Cv is (a)  1.66                                 ...

24. Which of the following formulae is wrong

(a) Cv=R/(γ-1)                                    (b)...

23. For a gas if γ=1.4 , then atomicity,

Cp and Cv of the gas are respectively (a)  Monoatomic,  (5/2)R ,(3/2)R          (b)  Monoatomic, (7/2)R ,(5/2)R...

22. The molar specific heat at constant pressure for a monoatomic gas is

(a) (3/2)R                                     ...

21. The specific heat of a gas

(a) Has only two values CP and Cv (b)  Has a unique value at a given temperature (c)   Can have...

20. The specific heats at constant pressure is greater than that of the same gas at constant volume because

(a)  At constant pressure work is done in expanding the gas (b)  At constant volume work is done in expanding ...

19. For a certain gas, the ratio of specific heats is given to be

γ=1.5. For this gas (a) Cv=(3R)/J                             ...

18. Supposing the distance between the atoms of a diatomic gas to be constant, its specific heat at constant volume per mole (gram mole) is

(a) (5/2)R                                     ...

17. The specific heat at constant volume for the monoatomic argon is 0.075 kcal/kg-K, whereas its gram molecular specific heat

Cv = 2.98 cal/mole/K. The mass of the argon atom is (a) 6.60×10-23 gm             ...

60. When temperature of an ideal gas is increased from

27°C  to 227°C , its r.m.s. speed changed from 400 metre/sec to Vs .The  is Vs (a)  516 metre/sec                  (b) ...

15. Molar specific heat at constant volume is

Cv  for a monoatomic gas is (a) (3/2)R                         ...

13. The specific heat of a gas at constant volume is 21.2 J/mole/°C. If the temperature is increased by 1°C keeping the volume constant, the change in its internal energy will be

(a) 0                                     ...

12. The relation between two specific heats of a gas is

(a)  Cp-Cv =R/J                             (b) Cv-Cp =R/J (c) Cp-Cv...

11. At constant volume the specific heat of a gas is  (3R)/2,  then the value of γ  will be      

(a) 3/2                                     ...

10. At constant volume, for different diatomic gases the molar specific heat is

(a)  Same and 3 cal/mole/°C approximately (b)  Exactly equal and its value is 4 cal/mole/°C (c)   Will be totally different...

9. For an ideal gas of diatomic molecules

(a) Cp=(5/2)R                           (b) Cv=(3/2)R (c) Cp-Cv=2R     ...

8. The value of

CV for one mole of neon gas is (a)  (1/2)R                     ...

7. For a gas

R/Cv=0.67 . This gas is made up of molecules which are (a) Diatomic (b)  Mixture of diatomic and polyatomic molecules...

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