(a) Is decreased (b) Is increased (c) Remains unchanged (d) Increases or decreases according to the nature of the gas Answer-b (2)
(a) 120 K (b) 240 K (c) 480 K (d) 1120 K Answer-c (3)
(a) Proportional to T (b) Proportional to T2 (c) Proportional to T3 (d) Independent of T Answer-d (33)
2.6 kg/cm3 (a) 3.6 m/s (b) 8.9×103 m/s (c) Zero …
(a) 2.5√RT/M (b) 1.73√RT/M (c) 2.5√M/RT …
(a) Water freezes (b) Liquid helium freezes (c) Molecular motion stops (d) Liquid hydrogen freezes Answer-c (5)
(a) Temperature (b) Internal Energy (c) Friction (d) Viscosity Answer-a (4)
(a) 1.5 m/s (b) 3.4 m/s (c) 9 m/s (d) 4 m/s Answer-d (3)
(a) 2 times of H-mean value (b) 1/2 times of H-mean value (c) 4 times of H-mean value (d) Same as H-mean value Answer-b (2)
Vrms the most probable speed Vmp and the average speed Vav obey the relationship (a) Vav >Vrms > Vmp (b) Vrms >Vav >Vmp (c) Vmp > Vav >Vrms …
(TA/MA)=4(TB/MB) where is the temperature and M is molecular mass. If CA and CB are the r.m.s. speed, then the ratio CA /CB will be equal to (a) 2 (b) 4 (c) 1 (d) 0.5 Answer-a (8)
(a) 1930√3 m/s (b) 836 m/s (c) 643 m/s (d) 1930/√3 m/s Answer-b (8)
Vrms is the root mean square velocity of the molecules of a gas and the Vs velocity of sound in it, then these are related as [γ =( CP/Cv)] (a) Vrms =Vs (b) Vrms = √(3/γ)Vs (c) Vrms = √(γ/3)Vs …
(a) Increase (b) Decrease (c) Remain same (d) Decrease for some, while increase for others Answer-c (7)
(a) 800 m/s (b) 400√2 m/s (c) 400 m/s (d) 200 m/s Answer-c (2)
927°C to 27°C. The m.s. velocity of the molecules becomes (a) Double the initial value (b) Half of the initial value (c) Four times the initial value (d) Ten times the initial value Answer-b (11)
(a) 1200°C (b) 927°C (c) 600°C (d) 108°C Answer-b (3)
(O2) has root mean square velocity of C ms–1, then root mean square velocity of the hydrogen (H2) will be (a) C m/s (b) 1/C m/s (c) …
(a) √2:1 (b) 1:√2 (c) 1 : 2 (d) 2 : 1 Answer-a (5)
(a) 2.91 (b) 3.52 (c) 4.00 (d) 4.24 Answer-d (4)
27°C to 327°C (a) √2 (b) 2 (c) 2√2 …
< CH > will be related to that of helium < CHe > as (a) < CH >=√2 < CHe > (b) < CH >= < CHe > (c) < …
( Crms = root mean square velocity of molecules and Ve = escape velocity) (a) Crms < Ve (b) Crms > Ve (c) Crms= Ve …
(a) Same (b) Proportional to molecular weight (c) Inversely proportional to molecular weight (d) Inversely proportional to square root of molecular weight Answer-d (3)
(a) 325.5°C (b) 851°C (c) 651°C (d) None of these Answer-c (3)
O2 molecules will be equal to the velocity of N2 molecules at 0°C (a) 40°C (b) 93°C (c) 39°C (d) …
d1 and d2 , then the ratio of speed of sound in these gases will be (a) d1d2 (b) √d2 /d1 (c) √d1 /d2 …
(a) 273°C (b) 546°C (c) 0°C (d) 136.5°C Answer-a (4)
(a) Independent of its pressure but directly proportional to its Kelvin temperature (b) Directly proportional to the square roots of both its pressure and its Kelvin temperature (c) Independent of its pressure but directly proportional to the square root of …
(a) 2 v (b) 3 v (c) 0.5 v (d) v Answer-d (3)
(a) 4v (b) 2v (c) v/2 (d) v/4 Answer-b (3)
(a) – 216°C (b) – 235°C (c) – 254°C (d) – 264°C Answer-c (15)
(a) 492 m /s (b) 517 m/s (c) 546 m/s (d) 33 m/s Answer-b (33)
(a) 77°C (b) 350°C (c) 273°C (d) 457°C Answer-a (4)
(a) 16 : 1 (b) 1 : 16 (c) 4 : 1 (d) 1 : 4 Answer-d (5)
(a) T (b) √T (c) T2 (d) 1/√T Answer-b (3)
(a) Twice (b) Half (c) Four times (d) One-fourth Answer-a (6)