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

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

Question # 2

Gases exert pressure on walls of container because the gas molecules

Question # 3

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

Question # 4

Liquids are less common than

Question # 5

Keeping the temperature constant, if the gas is expanded

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Boyle's law is represented as :

Question # 11

Boyle's law does not fall even

Question # 12

Which Statement about gases is not correct?

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

The intramolecular force in gases are :

Question # 18

Boyle's law doesn't fail even :

Question # 19

The rate of diffusion of a gas in

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

All gases can be compressed by :

Question # 26

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

Question # 27

Which of the following is the simplest form of matter?

Question # 28

Absolute temperature of a gas is proportional to

Question # 29

Which statement about gases is not correct ?

Question # 30

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

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Sr.# Question Answer
1 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
2 According to Boyle's law. which parameters give a straight line parallel to x-axis, when we plot a graph between
A. V and T
B. P and V
C. P and 1/V
D. P and PV
3 Liquids are less common than
A. Solids
B. Plasmas
C. Gases
D. All of above
4 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
5

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

6.02/22.4


B.

12.04/22.4 *1023


C.

18/22.4*1023

D.

55.6*6.02*1023 * 1023
6

Which of the following is the simplest form of matter?
A. Gaseous state
B. Liquid state
C. Solid state
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 Gases show uniform behaviour towards their
A. Internal conditions
B. External conditions
C. Internal and external conditions
D. None of above
9 The intramolecular forces in gases are
A. Weak
B. Normal
C. Very weak
D. Strong
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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