ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 3 Gases

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ECAT Chemistry Chapter 3 Gases

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Question # 1

In gases and liquids, temperature is the measure of

Question # 2

All gases can be compressed by :

Question # 3

Which of the following is the simplest form of matter?

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Liquids are less common than

Question # 11

Gases exert pressure on walls of container because the gas molecules

Question # 12

Gases exert pressure on walls of container because the gas molecules :

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

In Solids, the temperature is the measure of

Question # 20

Cooling happens under the Joule Thomson Effect due to sudden :

Question # 21

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

Question # 22

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

Question # 23

Cooling happens under the Joule Thomson Effect due to sudden

Question # 24

The intramolecular forces in gases are

Question # 25

Boyle's law doesn't fail even :

Question # 26

The molar value of CO2 is maximum at :

Question # 27

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

Question # 28

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

Question # 29

Boyle's law does not fall even

Question # 30

Absolute temperature of a gas is proportional to

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Sr.# Question Answer
1 All gases can be compressed by :
A. Keeping constant pressure
B. Decreasing pressure
C. Increasing pressure
D. None of the above
2 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
3 The rate of diffusion of a gas in
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
4 In Boyle's law which of the following pair is variable
A. Temperature and quantity of a gas
B. Pressure and Volume
C. Volume and quantity of a gas
D. Pressure and quantity of a gas
5 The relationships between volume of a given amount of gas and the prevailing conditions of temperature and pressure are
A. Charle's Law
B. Graham's Law
C. Boyle's Law
D. Gas Laws
6 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
7 In Solids, the temperature is the measure of
A. Rotational kinetic energies
B. Translational kinetic energies
C. Vibrational kinetic energies
D. None of above
8 Absolute temperature of a gas is proportional to
A. Rotational kinetic energy
B. Translational kinetic energy
C. Vibrational kinetic energy
D. Potential energy
9 The deviation of a gas from ideal behavior is maximum at :
A. -10°C and 5.0 atm
B. -10°C and 2.0 atm
C. 100°C and 2.0 atm
D. 0°C and 2.0 atm
10 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.
11 Gases of air always remain in random motion and do not settle due to :
A. Difference in molecular masses of air gases.
B. Difference in partial pressure of gas molecules.
C. Unequal number of different gas molecules.
D. Elastic collision of gas molecules.
12 For a gas obeying Boyle's law if pressure is doubled, the volume becomes
A. Remains constant
B. Double
C. One half
D. None of above
13 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.
14 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
15 The density of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to
A. Viscosity
B. Molar mass
C. Momentum
D. All of above
16 A graph between P and 1/V at constant temperature and number moles of a gas meets the
A. y-axis
B. x-axis
C. origin
D. none of above
17 A graph b/w P and 1/V at constant temperature and number of moles is parallel to :
A. Y-axis
B. Z-axis
C. X-axis
D. None of above
18 A graph between P and PV at constant temperature and number of mole is parallel to
A. y axis
B. z axis
C. x axis
D. pressure axis
19 The intramolecular force in gases are :
A. Weak
B. Normal
C. Very weak
D. Strong
20 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
21 Cooling happens under the Joule Thomson Effect due to sudden :
A. Contraction
B. Absortption
C. Expansion
D. All of above
22 According to Boyle's law, which parameters give a straight line parallel to axis-s, when we plot a graph between:
A. V and T
B. P and V
C. P and 1/V
D. P and PV
23 A graph b/w P and 1/V at constant temperature and number of moles is parallel to :
A. None of above
B. X-axis
C. Z-axis
D. Y-axis
24 Gases shows uniform behavior toward their :
A. Internal conditions
B. External conditions
C. Internal and external conditions
D. None of above
25

Which of the following is the simplest form of matter?
A. Gaseous state
B. Liquid state
C. Solid state
D. All of above
26 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
27 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
28 For a gas obeying Boyle's law if pressure is doubled, the volume becomes :
A. Remain constant
B. Double
C. One half
D. None of above
29 In Boyle's law which of the following pair remains constant :
A. Temperature and quality of a gas.
B. Pressure and quality of a gas.
C. Temperature and pressure
D. Temperature and quantity of a gas.
30 In solids, the temperature of is the measure of
A. Rotational kinetic energies
B. transnational kineticenergies
C. Vibrationalkineticenergies
D. None of the above

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