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MCQ on Behavior of Gas Boyle’s Law, Charles’s Law Avogadro’s Law

MCQ on Behavior of Gas Boyle’s Law, Charles’s Law Avogadro’s Law

MCQ on gas laws

MCQ General Knowledge on Behavior of Gas Boyle’s Law, Charles’s Law Avogadro’s Law Objective short Questions and Answers for class 9 10 and aspirants who are preparing for competitive govt job examinations like SSC, CGL, MTS, IAS, UPSC, Railway, Banking, Defence, Police CDS, etc..

Q.1 The constant quantity of Boyle’s Law is

A: Only mass of the gas
B: Only temperature of a gas
C: Mass and Pressure of a gas
D: Mass and temperature of a gas

Answer

D: Mass and temperature of a gas.

Q.2 Let the pressure P and volume V for a certain gas. If the pressure is increased by 25% at a constant temperature, then what would be the volume of the gas?

A: 0.6V
B: 0.75V
C: 0.8V
D: 0.85V

Answer

0.8V

Q.3 What is the nature of the pressure-volume (P-V) graph in Boyle’s Law?

A: Straight Line;
B: Circle:
C: Elliptical;
D: Rectangular Hyperbola:

Answer

Rectangular Hyperbola.

Q.4 What is the nature of the pressure-volume vs Pressure (PV vs P) graph in Boyle’s Law?

A: Straight Line parallel to P axis;
B: Straight line parallel to PV axis:
C: Elliptical;
D: Hyperbola:

Answer:

Straight-line parallel to the P axis.

Q.5 The unit of pressure in the SI system is-

A: N
B: N-m
C: N-m2
D: N/m2

Answer:

N/m2

Q.6 1 m3 = ______ cm3

A: 100
B: 103
C:105
D: 106

Answer

D: 106

Q.7 If the pressure of a certain amount of gas is reduced to 1/4th of its initial pressure at a fixed temperature, then what would be its final volume?

A: 2 times
B: 3 times
C: 4 times
D: 6 times

Answer

C: 4 times

Q.8 If the pressure is increased by 2 times of a certain amount of gas at a fixed temperature, then what would be its final volume?

A: Double
B: One half
C: Tripple
D: One fourth

Answer

B: One half

Q.9 Suppose, at for a gas having constant mass the volume is V0 at temperature 0 oC. What would be its final volume at 100 oC if the pressure remains constant?

A: (293/273)V0
B:(283/273)V0
C: (303/273)V0
D: (373/273)V0

Answer

(303/273)V0

Q.10 For a given mass of an ideal gas at constant pressure, the graph V – t (t in Celcius scale), intersect the temperature axis at –

A: – 273 oC
B: 0 oC
C: 273 oC
D: Do not intersect.

Answer

A: – 273 oC

Q.11 In which scale of temperature, the temperature can not be negative?

A: Celcius Scale
B: Fernheight Scale
C: Absolute Scale
D: All of the above

Answer

C: Absolute Scale

Q.12 The Freezing point of water in absolute scale is-

A: 0 K
B: 273 K
C: 212 K
D: None of the above;

Answer

B: 273 K

Q.13 If the temperature is increased from 0 oC to 30 oC at a constant pressure of gas having fixed mass, then the ratio of initial and final volume will be –

A: 91 : 101
B: 91 : 100
C: 91 : 111
D: 91 : 121

Answer

A: 91 : 101

Q.14 The constant quantity(s) in Charle’s Law is (are)-

A: Temperature
B: Volume
C: Pressure and Mass of gas
D: Temperature and Mass of gas

Answer

Pressure and Mass of a gas.

Q.15 The nature of the V-t (t in Celcius scale) graph in Charle’s law is-

A: Straight line
B: Circle
C: Parabola
D: Hyperbola

Answer

Straight line

Q.16 At which temperature the volume of gas reduces to Zero?

A: 0 K
B: 0 oC
C: 273 oC
D: 273 K

Answer

A: 0 K

Q.17 Which Scientist discovered the absolute scale of temperature?

A: Charles
B: Boyle
C: Kelvin
D: Gay-Lussac.

Answer

Kelvin

Q.18 At which temperature the real gas behaves as an ideal gas?

A: At high pressure and low temperature;
B: At low-pressure and high temperature;
C: At low pressure and low temperature;
D: AT high pressure and high temperature;

Answer

B: At high temperature and low pressure;

Q.19 The molar mass of water is –

A: 16 g
B: 20 g
C: 18 g
D: 44 g

Answer

C: 18 g

Q.20 The mass of 5 mol of Hydrogen gas is-

A: 5 g
B: 10 g
C: 18 g
D: 27 g

Answer

B: 10 g

Q.21 In the case of collision of two gas molecule of an ideal gas –

A: The linear momentum is conserved only;
B: The kinetic energy is conserved only;
C: Linear momentum and kinetic energy both conserve;
D: Linear momentum and kinetic energy both are not conserved;

Answer

C: Linear momentum and kinetic energy both are conserved.

Q.22 The energy of the molecules of an ideal gas is –

A: Only potential energy;
B: Only kinetic energy;
C: Kinetic energy + potential energy;
D: Kinetic energy – potential energy;

Answer

B: Only kinetic energy;

Q.23 Which is the Ideal Gas Equation from the following?

A: PV = mc2;
B: PV = mgh;
C: PV = nRT;
D: PV = mSt;

Answer

C: PV = nRT;

Q.24 Which is the constant quantity in Idial Gas Equation?

A: Pressure P
B: Volume V
C: R
D: Temperature

Answer

C: R

Q.25 The value of Universal Gas Constant in CGS unit is –

A: 8.31 * 106
B: 8.31 * 107
C: 8.31 * 108
D: 8.31 * 109

Answer

B: B: 8.31 * 107

Q.26 The dimension of the universal gas constant is –

A: M L2 T-1 N-1
B: M L-1 T-1 N-2K-1
C: M L2 T-1 N-2 K
D: M L-1 T-2 N-1 K-1

Answer

D: M L-1 T-2 N-1 K-1

Q.27 According to the kinetic theory of gas, at which temperature the kinetic energy of a molecule of an ideal gas becomes zero?

A: — 273 oC
B: 0 oC
C: – 100 oC
D: 273 K

Answer

A: — 273 oC

Q.28 84 g of N2 = ______ g N2.

A: 1 g
B: 2 g
C: 3 g
D: 4 g

Answer

C: 3 g

Q.29 Which of the following has the largest volume?
2 g of Hydrogen Gas, 28 g of Nitrogen Gas, 44 g of CO2 gas.

A: 2 g of Hydrogen Gas
B: 28 g of Nitrogen Gas
C: 44 g of CO2 gas
D: All gasses have the same volume.

Answer

D: All the gas has the same volume.

Q.30 How many atoms are there in 1 mol of CO2 gas if the Avogadro number in N?

A: N
B: 2N
C: 3N
D: 4N

Answer

C: 3N

Q.31 If the mass of 11.2 L of CO2 is 22g, then what is its atomic mass?

A: 22
B: 44:
C: 88
D: 11

Answer

B: 44

Q.32 The mass of an O2 molecule is –

A: 5.31 * 10-23g
B: 10.62 * 10-23
C: 15.93 * 10-23
D: 2.65 * 10-23

Answer

5.31 * 10-23g

Q.33 The number of molecules of 7g of N2 gas is-

A: 22.044 * 1023
B: 1.506 * 1023
C: 3.011 * 1023
D: 6.022 * 1023

Answer

1.506 * 1023

Q.34 The volume of 2.2 g CO2 at 27 oC and 570 mm pressure is –

A: 4.83 L
B: 0.82 L
C: 3.82 L
D: 1.64 L

Answer

D: 1.64 L

Q.35 At which condition the real gas deviated from the ideal gas?

A: At low temperature and low pressure
B: At Low pressure and high temperature;
C: At high pressure and low temperature;
D: At high pressure and high temperature;

Answer

At low temperature and high pressure.

Q.36 The state of the equation for 7g of Oxygen gas is _

A: PV = 7RT
B: PV = (32/7)RT
C: PV = (7/32)RT
D: PV = 32RT

Answer

C: PV = (7/32)RT

Q.37 If the pressure of a certain amount of gas is increased at a constant temperature, the density of the gas is –

A: Remain Constant;
B: Decreased;
C: Increased;
D: Can not be determined;

Answer

Increased

Q.38 What would be the volume of 22g of Carbon dioxide at STP?

A: 11.2 L
B: 1.12 L
C: 22.4 L
D: 2.24 L

Answer

11.2 L

Q.39 The molar volume of any gas at STP is –

A: 22.4 L
B: 2.24 L
C: 44 L
D: 24.2 L

Answer

22.4 L

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