18 Read the given statements and decide which is are correct

Vapour is injected at a uniform rate in a closed vessel Wi was initially evacuated The pressure in the vessel UPSEAT 2001 a Increases continuously b Decreases continuously c First increases and then decreases First increases and then becomes constant nts

d it The piston cylinder arrangement shown contains a diatomic gas at temperature 300 K The cross sectional area of the cylinder is1 m Initially the height of the piston above the base of the cylinder is 1 m The temperature is now raised to 400 K at constant pressure Find the new height of the piston above the base of the cylinder If the piston is now brought back to its original height without any heat loss find the new equilibrium temperature of the gas You can leave the answer in fraction DEF 20041 im

In a cubical box of volume V there are N molecules of a gas moving randomly If m is mass of each molecule and v2 is the mean square of x component of the velocity of molecules then the pressure of the gas is mNv SICS 1 P 3 V 3 P mNv 2 4 P mNv V P mNv

2 The atmospheric pressure on a hill is 68 cm of mercury What do you understand from the statement 3 How does atmospheric pressure change with the change in altitude 4 Briefly describe construction of a simple barometer

3 Which one of the following is not an assumption of kinetic theory of gases 1 The volume of a gas molecule is negligible 2 The gravitational attraction between the gas molecules is negligible 3 The density of gas is same at all points 4 The change in momentum of gas molecules is negligible

a 26 8 b 20 c 6 25 d 12 5 NEET 2018 At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth s atmosphere Given Mass of oxygen molecule m 2 76 x 10 26 kg Boltzmann s constant kg 1 38 x 10 23 J K B a 2 508 x 104 K c 5 016 104 K b 8 360 x 10 K d 1 254 x 10 K NEET 2018 un eq of a 12 T t

1 A fix amount of nitrogen gas 1 mole is taken and is subjected to pressure and temperature variation The experiment is performed at high pressure as well as high temperatures The results obtained are shown in the figures The correct variation of PV RT with P will be exhibited by UPSEAT 2001 4 PV RT a 4 2 0 1 0 3 2 b 3 1 P 100 200 400 600

6 0 A vessel of volume 100 liter contains an ideal gas at pressure P and temperature T Gas is continuously pumped out of the vessel at a constant volume rate 5 lit sec kepping the temperature constant The pressure of a gas being taken out equals the pressure inside the vessel then find out time after which pressure Po of gas becomes 100 1 40 3 92 2 80

Gas phase sulfur S and gas phase oxygen O have the same molar mass At the same temperature they also have the same A C v B average KE per mole C average rotation KE per mole D average translational KE per mole

D 1 840 K 2 280 K 3 560 K 4 373 K Root mean square speed of ideal hydrogen gas in closed chamber at 0 C is 3180 m s Its pressure will be density of hydrogen gas is 8 99 10 kg m 1 atm 1 01 x 10 N m RPMT 2010 1 1 0 atm 2 1 5 atm 3 2 0 atm 4 3 0 atm upplied to raise the temperature of 50 gm of air from 20 C to 30 C without any change in its RPMT 2011