# Kinetic Theory – Physics 11

## Kinetic Theory – Physics 11

1.Two containers A and B are partly filled with water and closed. The volume of A is twice that of B and it contains half the amount of water inB. If both are at the same temperature, the water vapour in the containers will have pressure in the ratio of

(a)1 : 2

(b)1 : 1

(c)2 : 1

(d)4 : 1

2.At constant volume, temperature is increased then

(a)collision on walls will be less

(b)number of collisions per unit time will increase

(c)collisions will be in straight lines

(d)collisions will not change.

3.A polyatomic gas with n degrees of freedom has a mean energy per molecule given by

(a)nkT/N

(b)nkT/2N

(c)nkT/2

(d)3kT/2

4.For a certain gas the ratio of specific heats is given to be = 1.5. For this gas

(a)CV= 3R/J

(b)CP= 3R/J

(c)CP= 5R/J

(d)CV= 5R/J

5.According to kinetic theory of gases, at absolute zero temperature

(a)water freezes

(b)liquid helium freezes

(c)molecular motion stops

(d)liquid hydrogen freezes

6.One mole of an ideal monoatomic gas requires207 J heat to raise the temperature by 10 K when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by the same 10 K, the heat required is:

(a)198.7 J

(b)29 J

(c)215.3 J

(d)124 J

7.Relation between pressure (P) and energy (E) of a gas is

(a)P=2/3E

(b)P=1/3E

(c)P=1/2E

(d)P= 3E

8.Three containers of the same volume contain three different gases. The masses of the molecules are m1, m2and m3and the number of molecules in their respective containers are N1, containersareN2and N3. The gas pre-container are P1, P2and P3respectively. All the gases are now mixed and put in one of these containers.The pressure P of the mixture will be

(a)P< (P1+ P2+ P3)

(b)P=P1+P2+P3/3

(c)P= P1+ P2+ P3

(d)P> (P1+ P2+ P3)

9.The number of translational degrees of freedom for a diatomic gas is

(a)2

(b)3

(c)5

(d)6

10.The pressure of a gas is raised from 27°C to 927°C.The root mean square speed is

(a)√(927/27)(times the earlier value)

(b)remain the same

(c)gets halved

(d)get doubled

11.The equation of state, corresponding to 8g ofO2is

(a)PV= 8 RT

(b)PV= RT/4

(c)PV= RT

(d)PV= RT/2

12.If Cs be the velocity of sound in air and C be ther.m.s velocity, then

(a)Cs < C

(b)Cs = C

(c)Cs= C (γ/3)½

(d)none of these

13.At 0K, which of the following properties of agas will be zero?

(a)Kinetic energy

(b)Potential energy

(c)Density

(d)Mass

14.The degree of freedom of a molecule of a triatomic gases

(a)2

(b)4

(c)6

(d)8

15.The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be

(a)PV =(5/16) RT

(b)PV = (5/32) RT

(c)PV = 5 RT

(d)PV = (5/2) RTwhere Ris the gas constant.

16.At 10° C the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At110°C this ratio is:

(a)x

(b)(383/283)x

(c)(10/110)x

(d)(283/383)x

17.In the given (V – T)diagram, what is the relation between pressure P1and P2 ?

(a)P2 > P1

(b)P2 < P1

(c)Cannot be predicted

(d)P2 = P1

18.The amount of heat energy required to raise the temperature of 1g of Helium at NTP, from T1K toT2K is

(a)3/2NakB(T2– T1)

(b)3/4NakB(T2– T1)

(c)3/4 NakB 21TT

(d)3/8NakB(T2– T1)

19.In a vessel, the gas is at a pressure P. If the mass of all the molecules is halved and their speed is doubled, then the resultant pressure will be

(a)4P

(b)2P

(c)P

(d)P/2

- Ans(2)
- Ans(2)
- Ans(3)
- Ans(2)
- Ans(3)
- Ans(4)
- Ans(1)
- Ans(3)
- Ans(2)
- Ans(4)
- Ans(2)
- Ans(3)
- Ans(1)
- Ans(3)
- Ans(2)
- Ans(4)
- Ans(2)
- Ans(4)
- Ans(2)

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