Exam (elaborations)
Chapter Thirteen KINETIC THEORY
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Chapter Thirteen KINETIC THEORY
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Exemplar Problems–PhysicsChapter Thirteen
KINETIC THEORY
MCQ I
13.1 A cubic vessel (with faces horizontal + vertical) contains an ideal
gas at NTP. The vessel is being carried by a rocket which is moving
at a speed of 500m s–1 in vertical direction. The pressure of the
gas inside the vessel as observed by us on the ground
(a) remains the same because 500m s−1 is very much smaller
than vrms of the gas.
(b) remains the same because motion of the vessel as a whole
does not affect the relative motion of the gas molecules and
the walls.
2
(c) will increase by a factor equal to ( v 2rms + (500)2 ) / v rms where
vrms was the original mean square velocity of the gas.
(d) will be different on the top wall and bottom wall of the vessel.
13.2 1 mole of an ideal gas is contained in a cubical volume V,
ABCDEFGH at 300 K (Fig. 13.1). One face of the cube (EFGH) is
made up of a material which totally absorbs any gas molecule
90
20/04/2018
, Kinetic Theory
incident on it. At any given time,
(a) the pressure on EFGH would be zero.
(b) the pressure on all the faces will the equal.
(c) the pressure of EFGH would be double the pressure
on ABCD.
(d) the pressure on EFGH would be half that on ABCD.
13.3 Boyle’s law is applicable for an Fig. 13.1
(a) adiabatic process.
(b) isothermal process.
(c) isobaric process.
(d) isochoric process.
13.4 A cylinder containing an ideal gas is in vertical position and has
a piston of mass M that is able to move up or down without friction
(Fig. 13.2). If the temperature is increased,
Fig. 13.2
(a) both p and V of the gas will change.
(b) only p will increase according to Charle’s law.
(c) V will change but not p.
(d) p will change but not V.
13.5 Volume versus temperature graphs for a given mass of an V
ideal gas are shown in Fig. 13.3 at two different values of (l) P2
constant pressure. What can be inferred about relation 40
between P 1 & P 2? 30
20 P1
(a) P1 > P2
10
(b) P1 = P2
100 200 300 400500
(c) P1 < P2 T (K)
(d) data is insufficient. Fig.13.3
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20/04/2018
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