ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

Question # 1

The rate of diffusion of a gas in

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 # 2

The highest temperature at which a substance can exist as a liquid is called its

Critical temperature A
Zero temperature B
Absolute temperature C
None of above D

Question # 3

Liquids are less common than :

Solids A
Plasmas B
Gases C
All of above D

Question # 4

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 # 5

Boyle's law doesn't fail even :

Temperature is extremely high A
Pressure is extremely high B
Mixture of gas is taken C
All of above D

Question # 6

Which of the following is the simplest form of matter?

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

Question # 7

In Solids, the temperature is the measure of

Rotational kinetic energies A
Translational kinetic energies B
Vibrational kinetic energies C
None of above D

Question # 8

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 # 9

In Boyle's law which of the following pair remains constant :

Temperature and quality of a gas. A
Pressure and quality of a gas. B
Temperature and pressure C
Temperature and quantity of a gas. D

Question # 10

Liquids are less common than

Solids A
Plasmas B
Gases C
All of above D

Question # 11

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 # 12

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 # 13

Which of the following is the simplest form of matter?

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

Question # 14

The relation ships b/w volume of given amount of gas and prevailing conditions of temperature and pressure are :

Charles's law A
Graham's law B
Boyle's law C
Gas law D

Question # 15

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 # 16

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

Evaportation A
Effusion B
Conduction C
Diffusion D

Question # 17

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 # 18

The graph between pressure and volume at constant temperature for a gas is

Isobaric A
Isothermal B
Isotherm C
None of above D

Question # 19

Which statement about gases is not correct ?

The spread throughout the vessel. A
Pressure is due to collision B
There are large spaces between the molecules. C
molecules are arranged regularly. D

Question # 20

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

Evaporation A
Effusion B
Conduction C
Difusion D

Question # 21

A graph b/w P and 1/V at constant temperature and number of moles is parallel to :

None of above A
X-axis B
Z-axis C
Y-axis D

Question # 22

For a gas obeying Boyle's law if pressure is doubled, the volume becomes

Remains constant A
Double B
One half C
None of above D

Question # 23

For a gas obeying Boyle's law if pressure is doubled, the volume becomes :

Remain constant A
Double B
One half C
None of above D

Question # 24

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 # 25

All gases can be compressed by :

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

Question # 26

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 # 27

A graph b/w P and 1/V at constant temperature and number of moles is parallel to :

Y-axis A
Z-axis B
X-axis C
None of above D

Question # 28

The product of pressure and volume remains constant when temperature and quantity of gas is

zero A
variable B
kept constant C
None of these D

Question # 29

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 # 30

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

Sr.#	Question	Answer
1	The relation ships b/w volume of given amount of gas and prevailing conditions of temperature and pressure are :	A. Charles's law B. Graham's law C. Boyle's law D. Gas law
2	The movement of gas molecules from a region of high pressure to vacuum is called	A. Evaportation B. Effusion C. Conduction D. Diffusion
3	Gases exert pressure on walls of container because the gas molecules :	A. Obey gas laws. B. Have definite volume. C. Collide with the walls of container. D. Collide with each other.
4	Which of the following is the simplest form of matter?	A. Gaseous state B. Liquid State C. Solid State D. All of above
5	The rate of diffusion of a gas is :	A. Inversely proportional to its density B. Inversely proportional to square root of its molecular mass C. Directly proportional to molecular mass D. Directly proportional to its density
6	Which of the following will have the same number of molecules at STP ?	A. 280 CM³ of CO² and 280 CM³ of N₂O B. 11.2 dm3 of O₂ and 32 g of O₂ C. 44 g of CO₂ and 11.2 dm³ of CO D. 28 g of N2 and 5.6 dm³ of oxygen
7	The molar value of CO₂is maximum at :	A. STP B. 127°C and 1 atm C. 0°C and 2 atm D. 273°C and 2 atm
8	Which statement about gases is not correct ?	A. The spread throughout the vessel. B. Pressure is due to collision C. There are large spaces between the molecules. D. molecules are arranged regularly.
9	The density of a gas is directly and volume at constant temperature for a gas is	A. Isobaric B. Isothermal C. Isotherm D. None of above
10	All gases can be compressed by	A. Keeping constant pressure B. Decreasing pressure C. Increasing pressure D. None of above

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ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 3 Gases

ECAT Chemistry Chapter 3 Gases

The rate of diffusion of a gas in

The highest temperature at which a substance can exist as a liquid is called its

Liquids are less common than :

Which Statement about gases is not correct?

Boyle's law doesn't fail even :

Which of the following is the simplest form of matter?

In Solids, the temperature is the measure of

Gases exert pressure on walls of container because the gas molecules

In Boyle's law which of the following pair remains constant :

Liquids are less common than

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

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

Which of the following is the simplest form of matter?

The relation ships b/w volume of given amount of gas and prevailing conditions of temperature and pressure are :

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

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

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

The graph between pressure and volume at constant temperature for a gas is

Which statement about gases is not correct ?

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

A graph b/w P and 1/V at constant temperature and number of moles is parallel to :

For a gas obeying Boyle's law if pressure is doubled, the volume becomes

For a gas obeying Boyle's law if pressure is doubled, the volume becomes :

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

All gases can be compressed by :

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

A graph b/w P and 1/V at constant temperature and number of moles is parallel to :

The product of pressure and volume remains constant when temperature and quantity of gas is

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

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

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