Molecules of a ideal gas behave like
inelastic rigid sphere
perfectly elastic non-rigid sphere
perfectly elastic rigid sphere
inelastic non-rigid sphere
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Molecules of ideal gas behaves like perfectly elastic rigid sphere.In kinetic theory of gases, it is assumed that molecules
(a) have same mass but can have different volume
(b) have same volume but mass can be different
(c) have different mass as well as volume
(d) have same mass but negligible volume.
What will be the effect on the root mean square velocity of oxygen molecules if the temperature is doubled and oxygen molecule dissociates into atomic oxygen?
The velocity of atomic oxygen remains same
The velocity of atomic oxygen doubles
The velocity of atomic oxygen becomes half
The velocity of atomic oxygen becomes four times
as, becomes double and becomes half
So, will become times i.e. 2 times.
According to kinetic theory of gases, at absolute zero temperature
water freezes
liquid helium freezes
molecular motion stops
liquid hydrogen freezes
At a given temperature the force between molecules of a gas as a function of intermolecular distance is
always constant
always decreases
always increases
first decreases and then increases
If the speed of oxygen molecules at is , find the rms speed of hydrogen molecules at .
Root mean square speed is given by
According to the kinetic theory of gases, the pressure exerted by a gas on the wall of the
container is measured as
rate of change of momentum imparted to the walls per second per unit area.
momentum imparted to the walls per unit area
change of momentum imparted to the walls per unit area.
change in momentum per unit volume
In a cubical vessel are enclosed molecules of a gas each having a mass and an average speed . If is the length of each edge of the cube, the pressure exerted by the gas will be
Pressure exerted by a gas is
independent of density of the gas
inversely proportional to the density of the gas
directly proportional to the square of the density of the gas
directly proportional to the density of the gas
Pressure exerted by a gas is given by
or
A gas is enclosed in a cube of side . What will be the change in momentum of the molecule, if it suffers an elastic collision with the plane wall parallel to -plane and rebounds with the same velocity?
initial velocities of the gas molecules]
zero
.
Since it hits the plane wall parallel to -plane and it rebounds with same velocity, its and components of velocity do not change, but the -component reverses the sign.
Velocity after collision is and .
The change in momentum is
At constant volume, temperature is increased then
collision on walls will be less
number of collisions per unit time will increase
collisions will be in straight lines
collisions will not change.
As the temperature increases, the average velocity increases. So, the collisions are faster.
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