Physics

R/Cp for diatomic gas (a)   3/4                                   (b)  3/5 (c)   2/7                                     (d)  5/7 Answer-c (11)

(a) 200 cal                                       (b)  300 cal (c)   100 cal                                     (d)  None of these Answer-b (20)

(a)  (1+n)/2                                            (b) 1+(1/n) (c)  1+(n/2)                                            (d)  1+(2/n) Answer-d (11)

(a)  Helium                                       (b)  Hydrogen (c)   Argon                                        (d)   Neon Answer-b (9)

(a) (3γ-1)/ (2γ-1)                                          (b) 2/(γ-1) (c)  (9/2)(γ-1)                                                (d)  (25/2)(γ-1)       Answer-b (5)

CP  and Cv  of the gas is 1.98 cal/gm mole K. From this data, the value of J is (a)  4.16 J/cal                      (b) 4.18 J/cal (c)  4.20 J/cal                       (d) …

(a)    2                                        (b)   3 (c)   5                                         (d)  6 Answer-b (6)

(a)  kT                                         (b)  k/T (c)   T/k                                     (d)  1/kT Answer-a (4)

(a)  Monoatomic                      (b)  Diatomic (c)   Same for both                   (d)  Can not be predicted Answer-a (5)

Cv and Cp of a gas has been reported by different students. The units are cal/gm-mole-K. Which of these sets is most reliable (a) Cv =3 ,Cp =5                          …

constant volume for NH3 (a)  1.33                                   (b)  1.44 (c)   1.28                                   (d)  1.67 Answer-a (7)

(a) Cp+Cv=R                         (b) Cp – Cv=R (c) Cp /Cv=R                         (d) Cv+Cp=R Answer-b (11)

(in JK-1 mol-1) at constant volume is (R=8.3JK-1 mol-1 ) (a)  18.7                                    (b)  18.9 (c)   19.2                                   (d)  None of the above Answer-a (6)

(a)   3/2         (b)   4/3 (c)   5/3         (d)    7/5 Answer-c (41)

[γ=(5/3)]  is mixed with one mole of diatomic gas [γ=(5/3)].  What is γ  for the mixture? γ denotes the ratio of specific heat at constant pressure, to that at constant volume (a)  3/2                                     (b)  23/15 (c)   35/23                                (d)  4/3 Answer-a …

(a) 7/3                                          (b)  5/4 (c)  19/13                              …

(Cp)  and at constant volume (Cv)  which is correct (a)  Cp of hydrogen gas is (5/2)R (b)  Cv of hydrogen gas is (7/2)R (c)  H2  has very small values of Cp and Cv (d) Cp  – Cv = 1.99 cal/mole–K  for …

(a)  (3/2)R                                   (b) (5/2)R (c)   (7/2)R                                   (d) 4R …

(a) 8475 J/kg K                                (b) 5186J/kg K (c) 1660 J/kg K                                (d) 10375 J/kg K Answer-d (43)

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

Cp/Cv is (a)  1.66                                    (b)  1.40 (c)   1.33                                   (d)  1.00 Answer-b (5)

(a) Cv=R/(γ-1)                                    (b) Cp=Rγ/(γ-1) (c) Cp/Cv = γ                                …

Cp and Cv of the gas are respectively (a)  Monoatomic,  (5/2)R ,(3/2)R          (b)  Monoatomic, (7/2)R ,(5/2)R (c)   Diatomic, (7/2)R ,(5/2)R                (d)  Triatomic, (7/2)R ,(5/2)R Answer-c (6)

(a) (3/2)R                                                (b) (5/2)R (c) (7/2)R                        …

(a) Has only two values CP and Cv (b)  Has a unique value at a given temperature (c)   Can have any value between 0 and ∞ (d)  Depends upon the mass of the gas Answer-c (17)

(a)  At constant pressure work is done in expanding the gas (b)  At constant volume work is done in expanding  the gas (c)   The molecular attraction increases more at constant pressure (d)  The molecular vibration increases more at constant pressure …

γ=1.5. For this gas (a) Cv=(3R)/J                                       (b) Cp=(3R)/J (c) Cv=(5R)/J                         …

(a) (5/2)R                                                (b) (3/2)R (c)   R                        …

Cv = 2.98 cal/mole/K. The mass of the argon atom is (a) 6.60×10-23 gm                            (b) 3.30×10-23 gm (c) 2.20×10-23 gm                …

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)  450 metre/sec (c)   310 metre/sec                  (d)  746 metre/sec Answer-a (5)

Cv  for a monoatomic gas is (a) (3/2)R                                                (b) (5/2)R (c)   3R            …

(a) 0                                              (b)    21.2 J (c)   42.2 J                    …

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

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

(a)  Same and 3 cal/mole/°C approximately (b)  Exactly equal and its value is 4 cal/mole/°C (c)   Will be totally different (d)  Approximately equal and its value is 5 cal/mole/°C Answer-d (3)

(a) Cp=(5/2)R                           (b) Cv=(3/2)R (c) Cp-Cv=2R                            (d) Cp=(7/2)R Answer-d (10)

CV for one mole of neon gas is (a)  (1/2)R                                   (b) (3/2)R (c) (5/2)R                      …

R/Cv=0.67 . This gas is made up of molecules which are (a) Diatomic (b)  Mixture of diatomic and polyatomic molecules (c)   Monoatomic (d)  Polyatomic Answer-c (5)

The Cp/Cv is (a)   1.67                                   (b)  1.4 (c)   1.29                                   (d)  1.33 Answer-d (8)

(a)  2                                         (b)  4 (c)   6                                         (d)  8 Answer-c (10)