ECAT Pre Engineering Chemistry Chapter 3 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 3 Gases

Try The MCQ's Test For ECAT Chemistry Chapter 3 Gases

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ECAT Chemistry Chapter 3 Gases

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Question # 1

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

Question # 2

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

Question # 3

Which of the following is the simplest form of matter?

Question # 4

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

Question # 5

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

Question # 6

Liquids are less common than

Question # 7

Which statement about gases is not correct ?

Question # 8

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

Question # 9

The rate of diffusion of a gas is :

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Boyle's law doesn't fail even :

Question # 15

Keeping the temperature constant, if the gas is expanded

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

How should condition be changed to prevent the volume of a given gas from expanding whine its mass is increased ?

Question # 20

The intramolecular force in gases are :

Question # 21

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

Question # 22

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

Question # 23

The intramolecular forces in gases are

Question # 24

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

Question # 25

Which of the following is the simplest form of matter?

Question # 26

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

Question # 27

Boyle's law does not fall even

Question # 28

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

Question # 29

All gases can be compressed by :

Question # 30

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

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ECAT Chemistry Chapter 3 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 In solids, the temperature of is the measure of
A. Rotational kinetic energies
B. transnational kineticenergies
C. Vibrationalkineticenergies
D. None of the above
4 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
5 The movement of gas molecules from a region of high pressure to vacuum is called
A. Evaportation
B. Effusion
C. Conduction
D. Diffusion
6 Which Statement about gases is not correct?
A. They spread throughout the vessel
B. Pressure is due to collision
C. There are larger spaces between the molecules
D. Molecules are arranged regularly
7 Absolute temperature of a gas is proportional to
A. Rotational kinetic energy
B. Translational kinetic energy
C. Vibrational kinetic energy
D. Potential energy
8

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
9 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
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

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