ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

Question # 1

The order of the rate of diffusion of gases NH₃,SO₂, CL₂, and CO₂ IS :

NH_{3 >}SO_{2 >}CL_{2 >}CO₂ A
NH_{3 >}CO_{2 >}SO_{2 >}CL₂ B
CL_{2 >}SO_{2 >}CO_{2 >}NH₃ C
NH_{3 >}CO₂_>CL_{2 >}SO₂ D

Question # 2

Liquids are less common than

Solids A
Plasmas B
Gases C
All of above D

Question # 3

Gases of air, always remain in random motion and do not settle due to

Difference in molecular masses of air gases A
Difference in partial pressure of gas molecules B
Unequal number of different gas molecules C
Elastic collision of gas molecules D

Question # 4

Which of the following will have the same number of molecules at STP ?

280 CM³ of CO² and 280 CM³ of N₂O
A
11.2 dm3 of O₂ and 32 g of O₂
B
44 g of CO₂ and 11.2 dm³ of CO
C
28 g of N2 and 5.6 dm³ of oxygen
D

Question # 5

According to Boyle's law, which parameters give a straight line parallel to axis-s, when we plot a graph between:

V and T A
P and V B
P and 1/V C
P and PV D

Question # 6

A graph between P and 1/V at constant temperature and number moles of a gas meets the

y-axis A
x-axis B
origin C
none of above D

Question # 7

A real gas obeying van der Waals' equation will resemble ideal gas if :

both 'a' and 'b' are large A
both 'a' and 'b' are small B
'a' is small and 'b' is large C
'a' is large and 'b' is small D

Question # 8

Keeping the temperature constant, if the gas is expanded

kinetic energy of molecules will increase A
Number of gas molecules increases B
Temperature will increases C
Pressure will decrease D

Question # 9

Pressure remaining constant, at which temperature volume of gas will become twice of what it is at 0°C ?

546
A
200 B
546K C
273K D

Question # 10

Which of the following is the simplest form of matter?

Gaseous state A
Liquid State B
Solid State C
All of above D

Question # 11

Gases exert pressure on walls of container because the gas molecules

Obey gas laws A
Have definite volume B
Collide with the walls of container C
Collide with each other D

Question # 12

The deviation of a gas from ideal behavior is maximum at :

-10°C and 5.0 atm A
-10°C and 2.0 atm B
100°C and 2.0 atm C
0°C and 2.0 atm D

Question # 13

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will be

Remain unchanged A
Doubled B
Reduced C
Increased four times D

Question # 14

Liquids are less common than :

Solids A
Plasmas B
Gases C
All of above D

Question # 15

The ratio of volume to temperature on Kelvin scale is constant according to

Charle's law A
Newton's law B
Coulomb's law C
Boyle's law D

Question # 16

At constant temperature when pressure of a gas is plotted against volume, the curve is

Slanting straight line A
Parabolic B
Staight line, parallel to pressure axis C
OF neither type D

Question # 17

The density of a gas is directly and volume at constant temperature for a gas is

Isobaric A
Isothermal B
Isotherm C
None of above D

Question # 18

Which Statement about gases is not correct?

They spread throughout the vessel A
Pressure is due to collision B
There are larger spaces between the molecules C
Molecules are arranged regularly D

Question # 19

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will :

remain unchanged A
increase four times B
reduce to 1/4 C
be doubled D

Question # 20

The movement of gas molecules from a region of high pressure to vacuum is called

Evaportation A
Effusion B
Conduction C
Diffusion D

Question # 21

In solids, the temperature of is the measure of

Rotational kinetic energies A
transnational kineticenergies B
Vibrationalkineticenergies C
None of the above D

Question # 22

How should condition be changed to prevent the volume of a given gas from expanding whine its mass is increased ?

Temperature is lowered and pressure is increased A
Temperature is increasedand pressure is lowered B
Temperature and pressure both are lowered C
Temperature and pressure both are increased D

Question # 23

The relationships between volume of a given amount of gas and the prevailing conditions of temperature and pressure are

Charle's Law A
Graham's Law B
Boyle's Law C
Gas Laws D

Question # 24

Equal masses of methane and oxygen are mixed in an empty container at 25°CThe fraction of total pressure exerted by oxygen is :

1/2 A
8/9 B
1/9 C
16/17 D

Question # 25

Boyle's law is represented as :

P∞ 1/T
A
V and 1/P B
P∞P C
P∞1/P D

Question # 26

In Boyle's law which of the following pair is variable

Temperature and quantity of a gas A
Pressure and Volume B
Volume and quantity of a gas C
Pressure and quantity of a gas D

Question # 27

All gases can be compressed by :

Keeping constant pressure A
Decreasing pressure B
Increasing pressure C
None of the above D

Question # 28

Cooling happens under the Joule Thomson Effect due to sudden :

Contraction A
Absortption B
Expansion C
All of above D

Question # 29

The rate of diffusion of a gas is :

Inversely proportional to its density A
Inversely proportional to square root of its molecular mass B
Directly proportional to molecular mass C
Directly proportional to its density D

Question # 30

In Boyle's law which of the following pair is variable :

Temperature and quantity of a gas. A
Pressure and volume B
Volume and quantity of a gas. C
Pressure and quantity of a gas. D

Sr.#	Question	Answer
1	Boyle's law is represented as :	A. P∞ 1/T B. V and 1/P C. P∞P D. P∞1/P
2	The movement of molecules from a region of high pressure to vacuum is called :	A. Evaporation B. Effusion C. Conduction D. Difusion
3	If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will be	A. Remain unchanged B. Doubled C. Reduced D. Increased four times
4	The product of pressure and volume remains constant when temperature and quantity of gas is	A. zero B. variable C. kept constant D. None of these
5	Which of the following is the simplest form of matter?	A. Gaseous state B. Liquid State C. Solid State D. All of above
6	All gases can be compressed by	A. Keeping constant pressure B. Decreasing pressure C. Increasing pressure D. None of above
7	The order of the rate of diffusion of gases NH₃,SO₂, CL₂, and CO₂ IS :	A. NH_{3 >}SO_{2 >}CL_{2 >}CO₂ B. NH_{3 >}CO_{2 >}SO_{2 >}CL₂ C. CL_{2 >}SO_{2 >}CO_{2 >}NH₃ D. NH_{3 >}CO₂_>CL_{2 >}SO₂
8	At constant temperature when pressure of a gas is plotted against volume, the curve is	A. Slanting straight line B. Parabolic C. Staight line, parallel to pressure axis D. OF neither type
9	Keeping the temperature constant, if the gas is expanded	A. kinetic energy of molecules will increase B. Number of gas molecules increases C. Temperature will increases D. Pressure will decrease
10	If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will :	A. remain unchanged B. increase four times C. reduce to 1/4 D. be doubled

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