ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

Question # 1

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 # 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

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 # 4

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 # 5

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 # 6

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 # 7

Gases deviate from ideal behavior at high pressure. Which of the following is correct for non-ideality ?

At high pressure, the gas molecules move in one direction only. A
At high pressure, the collisions between the gas molecules are increased manifold. B
At high pressure, the volume of gas becomes insignificant. C
At high pressure, the inter molecular attraction become significant. D

Question # 8

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 # 9

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 # 10

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 # 11

A graph between P and PV at constant temperature and number of mole is parallel to

y axis A
z axis B
x axis C
pressure axis D

Question # 12

Which of the following is the simplest form of matter?

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

Question # 13

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 # 14

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 # 15

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 # 16

The density of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to

Viscosity A
Molar mass B
Momentum C
All of above 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

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 # 19

Liquids are less common than

Solids A
Plasmas B
Gases C
All of above D

Question # 20

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 # 21

The intramolecular forces in gases are

Weak A
Normal B
Very weak C
Strong D

Question # 22

Liquids are less common than :

Solids A
Plasmas B
Gases C
All of above D

Question # 23

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 # 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

Absolute temperature of a gas is proportional to

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

Question # 26

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 # 27

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 # 28

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 # 29

Boyle's law is represented as :

P∞ 1/T
A
V and 1/P B
P∞P C
P∞1/P D

Question # 30

In solids, the temperature of is the measure of

Rotational kinetic energies A
transnational kineticenergies B
Vibrationalkineticenergies C
None of the above 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	Number of molecules in one dm³of water is close to :	A. 6.02/22.4 B. 12.04/22.4 10²³ C. 18/22.410²³ D. 55.66.0210²³* 10²³
3	A real gas obeying van der Waals' equation will resemble ideal gas if :	A. both 'a' and 'b' are large B. both 'a' and 'b' are small C. 'a' is small and 'b' is large D. 'a' is large and 'b' is small
4	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
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	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
7	Pressure remaining constant, at which temperature volume of gas will become twice of what it is at 0°C ?	A. 546 B. 200 C. 546K D. 273K
8	The ratio of volume to temperature on Kelvin scale is constant according to	A. Charle's law B. Newton's law C. Coulomb's law D. Boyle's law
9	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
10	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

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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

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

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

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

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

The rate of diffusion of a gas is :

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

Gases deviate from ideal behavior at high pressure. Which of the following is correct for non-ideality ?

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

The molar value of CO2 is maximum at :

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

A graph between P and PV at constant temperature and number of mole is parallel to

Which of the following is the simplest form of matter?

Boyle's law does not fall even

Which Statement about gases is not correct?

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

The density of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to

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

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

Liquids are less common than

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

The intramolecular forces in gases are

Liquids are less common than :

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

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

Absolute temperature of a gas is proportional to

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

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

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

Boyle's law is represented as :

In solids, the temperature of is the measure of

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The molar value of CO₂is maximum at :