The coefficient of volume expansion of glycerine is 49 x 10-5 /oC .The fractional change in the density for a 30o C rise in temperature will be :
0.145
0.0145
0.00145
0.000145
If an oxygen atom and hydrogen atom are having the same temperature, then ratio of their average kinetic energy is
1 : 1
2 : 1
4 : 1
1 : 4
A vessel contains 1 mole of O2 gas (molar mass 32) at temperature T. The pressure of the gas is P. An identical vessel containing one mole of He (molar mass 4) at a temperature 2T has a pressure of
P/8
P
8P
2P
R.M.S velocity of a molecule is C at pressure P. If pressure is increased two times, then r.m.s velocity becomes
0.5 C
C
2 C
3 C
An electric fan is switched on in a closed room. The air in the room
is cooled
is heated
maintains its temperature
is heated or cooled depending upon atmosphere pressure
