ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

Question # 1

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 # 2

Boyle's law is represented as :

P∞ 1/T
A
V and 1/P B
P∞P C
P∞1/P D

Question # 3

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 # 4

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 # 5

Liquids are less common than :

Solids A
Plasmas B
Gases C
All of above D

Question # 6

In gases and liquids, temperature is the measure of :

Average transnational kinetic energies of molecules. A
Average vibrational kinetic energies of molecules. B
Average rotational kinetic energies of molecules. C
None of above D

Question # 7

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 # 8

Which of the following is the simplest form of matter?

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

Question # 9

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 # 10

Cooling happens under the Joule Thomson Effect due to sudden

Contraction A
Absorption B
Expansion 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

Absolute temperature of a gas is proportional to

Rotational kinetic energy A
Translational kinetic energy B
Vibrational kinetic energy C
Potential energy D

Question # 13

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 # 14

Which of the following is the simplest form of matter?

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

Question # 15

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 # 16

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

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

Question # 17

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 # 18

Number of molecules in one dm³of water is close to :

6.02/22.4

A
12.04/22.4 *10²³

B
18/22.4*10²³
C
55.6*6.02*10²³* 10²³
D

Question # 19

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 # 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

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

Isobaric A
Isothermal B
Isotherm C
None of above D

Question # 22

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 # 23

Gases shows uniform behavior toward their :

Internal conditions A
External conditions B
Internal and external conditions C
None of above D

Question # 24

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 # 25

Boyle's law does not fall even

Temperature is extremely high A
Pressure is extremely high B
Mixture of gases is taken C
all of above D

Question # 26

In solids, the temperature of is the measure of

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

Question # 27

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 # 28

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 # 29

The molar value of CO₂is maximum at :

STP A
127°C and 1 atm B
0°C and 2 atm C
273°C and 2 atm D

Question # 30

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

Sr.#	Question	Answer
1	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
2	All gases can be compressed by :	A. Keeping constant pressure B. Decreasing pressure C. Increasing pressure D. None of the above
3	Liquids are less common than :	A. Solids B. Plasmas C. Gases D. All of above
4	Equal masses of methane and oxygen are mixed in an empty container at 25°CThe fraction of total pressure exerted by oxygen is :	A. 1/2 B. 8/9 C. 1/9 D. 16/17
5	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
6	Cooling happens under the Joule Thomson Effect due to sudden	A. Contraction B. Absorption C. Expansion D. All of above
7	The movement of gas molecules from a region of high pressure to vacuum is called	A. Evaportation B. Effusion C. Conduction D. Diffusion
8	Boyle's law does not fall even	A. Temperature is extremely high B. Pressure is extremely high C. Mixture of gases is taken D. all of above
9	Gases shows uniform behavior toward their :	A. Internal conditions B. External conditions C. Internal and external conditions D. None of above
10	In gases and liquids, temperature is the measure of	A. Average translational kinetic energies of molecules B. Average vibrational kinetic energies of molecules C. Average rotational kinetic energies of molecules D. None of above

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 3 Gases

ECAT Chemistry Chapter 3 Gases

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

Boyle's law is represented as :

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

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

Liquids are less common than :

In gases and liquids, temperature is the measure of :

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

Which of the following is the simplest form of matter?

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

Cooling happens under the Joule Thomson Effect due to sudden

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

Absolute temperature of a gas is proportional to

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

Which of the following is the simplest form of matter?

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

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

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

Number of molecules in one dm3 of water is close to :

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

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

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

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

Gases shows uniform behavior toward their :

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

Boyle's law does not fall even

In solids, the temperature of is the measure of

Boyle's law doesn't fail even :

Gases exert pressure on walls of container because the gas molecules

The molar value of CO2 is maximum at :

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

Prepare Complete Set Wise ECAT Chemistry Chapter 3 Gases MCQs Online With Answers

Set 1

Set 2

Set 3

Topic Test

Top Scorers Of ECAT Chemistry Chapter 3 Gases MCQ`s Test

ECAT Chemistry Chapter 3 Important MCQ's

Test Questions

Share your comments & questions here

ahsan

Number of molecules in one dm³of water is close to :

The molar value of CO₂is maximum at :