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# Multiple choice question for engineering

## Set 1

1. The ratio of partial pressure of the vapour in the gas mixture and the vapour pressure of the vapour component is called
a) Relative Humidity
b) Humidity
c) Dry air pressure
d) None of the mentioned

Answer: a [Reason:] The ratio of partial pressure of the vapour in the gas mixture and the vapour pressure of the vapour component is called Relative Humidity.

2-3. Announcement is made on radio that the temperature is 25 degree Celsius and the relative humidity is 65%.
2. What is the value of p(H2O)/p*(H2O)?
a) 0.45
b) 0.65
c) 0.85
d) None of the mentioned

Answer: b [Reason:] p(H2O)/p*(H2O) = %R.H./100.

3. Measurements of p(H2O) & p*(H2O) have been made at 25 degree celsius.
The above given statement is
a) Incorrect
b) Correct
c) Depends on other conditions as well
d) None of the mentioned

Answer:b [Reason:] Measurements of p(H2O) & p*(H2O) have been made at 25 degree celsius.

4. Zero percent relative saturation means
a) 100 % vapour in the air
b) 75% vapour in the air
c) 50% vapour in the air
d) No vapour in the air

Answer: d [Reason:] Zero percent relative saturation means no vapour in the air.

5. When the partial pressure of the vapour in the gas is same as the vapour pressure of the substance. What is the relative saturation?
a) 0%
b) 50%
c) 100%
d) None of the mentioned

Answer: c [Reason:] 100% relative saturation means the partial pressure of the vapour in the gas is same as the vapour pressure of the substance.

6. The mass of water vapour per unit mass of bone dry air is called
a) Relative saturation
b) Relative Humidity
c) Humidity
d) None of the mentioned

Answer: c [Reason:] The mass of water vapour per unit mass of bone dry air is called Humidity.

7. The usual temperature of a gas or liquid is
a) Dry bulb temperature
b) Wet bulb temperature
c) Standard temperature
d) None of the mentioned

Answer: a [Reason:] The usual temperature of a gas or liquid is dry bulb temperature.

8. The temperature reaches at equilibrium for the vaporization of a small amount of water in to a large amount of air.
a) Dry bulb temperature
b) Wet bulb temperature
c) Standard temperature
d) None of the mentioned

Answer: b [Reason:] The temperature reach at equilibrium for the vaporization of a small amount of water in to a large amount of air is called wet bulb temperature.

9. The heat capacity of an air-water vapour mixture per mass of bone dry air is called humid heat.
The above given statement is
a) Correct
b) Incorrect
c) Partially correct
d) None of the mentioned

Answer: a [Reason:] The heat capacity of an air-water vapour mixture per mass of bone dry air is called Humid heat.

10. The volume of air including the water vapour per mass of bone dry air.
a) Humid volume
b) Critical volume
c) Standard volume
d) None of the mentioned

Answer: a [Reason:] The volume of air including the water vapour per mass of bone dry air humid volume.

## Set 2

1-2. For a mixture of NO3 and SO2, having 25 moles and 100 moles respectively. The total pressure exerted by the gases is 100 atm.
1. What is the partial pressure of NO3?
a) 20 atm
b) 40 atm
c) 60 atm
d) 80 atm

Answer: a [Reason:] Pi = (Xi)(Ptotal).

2. What is the partial pressure of SO2?
a) 20 atm
b) 40 atm
c) 60 atm
d) 80 atm

Answer: d [Reason:] Pi = (Xi)(Ptotal).

3. “The pressure that would be exerted by a single component in a gaseous mixture if it is existed alone in the same volume as occupied by the mixture and at the same temperature as the mixture”” is known as
a) Absolute pressure
b) Partial pressure
c) Total pressure of a gas mixture
d) None of the mentioned

Answer: b [Reason:] Pressure exerted by a single component in a gaseous mixture if it is existed alone in the same volume is partial pressure.

4-6. In an ideal gas mixture, the mole percent of the gases are given as – 15% O2, 25% CO2 and 60% N2 at 400 degree Celsius and 560 mm of Hg pressure.
4. What is the partial pressure of O2 gas?
a) 84
b) 140
c) 336
d) None of the mentioned

Answer: a [Reason:] Partial pressure = Total pressure*Mole fraction.

5. What is the partial pressure of CO2 gas?
a) 84
b) 140
c) 336
d) None of the mentioned

Answer: b [Reason:] Partial pressure = Total pressure*Mole fraction.

6. What is the partial pressure of N2 gas?
a) 84
b) 140
c) 336
d) None of the mentioned

Answer: c [Reason:] Partial pressure = Total pressure*Mole fraction.

7. Volume occupied by a single gas alone of a mixture at the same temperature and pressure of the mixture is called
a) Absolute volume
b) Partial volume
c) Total volume of a gas mixture
d) None of the mentioned

Answer: b [Reason:] Volume occupied by a single gas alone of a mixture at the same temperature and pressure of the mixture is Partial volume.

8. The sum of the partial pressures of the components of a gas mixture`s is
a) Total absolute pressure
b) Total pressure exerted by a component of a gas
c) Total pressure of a gas mixture
d) None of the mentioned

Answer: c [Reason:] The sum of the partial pressures of the components of a gas mixture`s is Total pressure of a gas mixture.

9-10. In an ideal gas mixture, the mixture contains two gases as 5 moles N2 and 15 moles O2. Pressure in the container is 40 atm.
9. Pressure exerted by N2 is
a) 10 atm
b) 20 atm
c) 30 atm
d) 40 atm

Answer: a [Reason:] Partial pressure = Total pressure*Mole fraction.

10. Pressure exerted by O2 is
a) 10 atm
b) 20 atm
c) 30 atm
d) 40 atm

Answer: c [Reason:] Partial pressure = Total pressure*Mole fraction.

## Set 3

1-2. For a mixture of NO3 and SO2, having 25 moles and 100 moles respectively. The total pressure exerted by the gases is 100 atm.
1. What is the partial pressure of NO3?
a) 20 atm
b) 40 atm
c) 60 atm
d) 80 atm

Answer: a [Reason:] Pi = (Xi)(Ptotal).

2. What is the partial pressure of SO2?
a) 20 atm
b) 40 atm
c) 60 atm
d) 80 atm

Answer: d [Reason:] Pi = (Xi)(Ptotal).

3. “The pressure that would be exerted by a single component in a gaseous mixture if it is existed alone in the same volume as occupied by the mixture and at the same temperature as the mixture”” is known as
a) Absolute pressure
b) Partial pressure
c) Total pressure of a gas mixture
d) None of the mentioned

Answer: b [Reason:] Pressure exerted by a single component in a gaseous mixture if it is existed alone in the same volume is partial pressure.

4-6. In an ideal gas mixture, the mole percent of the gases are given as – 15% O2, 25% CO2 and 60% N2 at 400 degree Celsius and 560 mm of Hg pressure.
4. What is the partial pressure of O2 gas?
a) 84
b) 140
c) 336
d) None of the mentioned

Answer: a [Reason:] Partial pressure = Total pressure*Mole fraction.

5. What is the partial pressure of CO2 gas?
a) 84
b) 140
c) 336
d) None of the mentioned

Answer: b [Reason:] Partial pressure = Total pressure*Mole fraction.

6. What is the partial pressure of N2 gas?
a) 84
b) 140
c) 336
d) None of the mentioned

Answer: c [Reason:] Partial pressure = Total pressure*Mole fraction.

7. Volume occupied by a single gas alone of a mixture at the same temperature and pressure of the mixture is called
a) Absolute volume
b) Partial volume
c) Total volume of a gas mixture
d) None of the mentioned

Answer: b [Reason:] Volume occupied by a single gas alone of a mixture at the same temperature and pressure of the mixture is Partial volume.

8. The sum of the partial pressures of the components of a gas mixture`s is
a) Total absolute pressure
b) Total pressure exerted by a component of a gas
c) Total pressure of a gas mixture
d) None of the mentioned

Answer: c [Reason:] The sum of the partial pressures of the components of a gas mixture`s is Total pressure of a gas mixture.

9-10. In an ideal gas mixture, the mixture contains two gases as 5 moles N2 and 15 moles O2. Pressure in the container is 40 atm.
9. Pressure exerted by N2 is
a) 10 atm
b) 20 atm
c) 30 atm
d) 40 atm

Answer: a [Reason:] Partial pressure = Total pressure*Mole fraction.

10. Pressure exerted by O2 is
a) 10 atm
b) 20 atm
c) 30 atm
d) 40 atm

Answer: c [Reason:] Partial pressure = Total pressure*Mole fraction.

## Set 4

1. ___________is any measurable characteristics of a substance that can be calculated or deduced.
a) Property
b) State
c) Phase
d) None of the mentioned

Answer: a [Reason:] Property is any measurable characteristics of a substance that can be calculated or deduced.

2. ________ of a system gives the condition of a system as specified by its properties.
a) Property
b) State
c) Phase
d) None of the mentioned

Answer: b [Reason:] State of a system gives the condition of a system as specified by its properties.

3. A ________ is completely homogeneous and uniform state of matter
a) Property
b) State
c) Phase
d) None of the mentioned

Answer: c [Reason:] State of a system gives the condition of a system as specified by its properties.

4. A compound may consists of _______ phase.
a) Only one
b) Only two
c) Not more than two
d) One or more than one

Answer: d [Reason:] A compound may consists of one or more than one phase.

5. Mercury and water (Immiscible) in a same container would represent two different phases.
The statement is
a) Correct
b) Incorrect
c) Can`t say
d) None of the mentioned

Answer: a [Reason:] A compound may consists of one or more than one phase.

6. Incorrect equation for an ideal is
a) PV = nRT
b) Pv = RT
c) PM = ρRT
d) None of the mentioned
where: P – Absolute Pressure of the gas
V – Total volume occupied by the gas
n – Number of moles of the gas
T – Absolute temperature
v – Specific molar volume
ρ – Density of the gas

Answer: d [Reason:] All three are correct as a & b are ideal gas law and c is in the form of density.

7. For an ideal gas, the specific molar volume of the gas is doubled then the pressure would be (Other parameters are same)
a) Same as before
b) Double
c) Half
d) None of the mentioned

Answer: c [Reason:] Pressure and specific volumes are inversely proportional.

8. Specific molar volume for an ideal gas is
a) Volume per mass
b) Volume per molecular weight
c) Volume per mole
d) None of the mentioned

Answer: c [Reason:] Specific molar volume for an ideal gas is Volume per mole.

9. The inverse of molar volume is
a) Molar density
b) Mole fraction
c) Molar specific volume
d) None of the mentioned

Answer: a [Reason:] The inverse of molar volume is Molar density (V/n).

10. For the universal gas constant, (cm3)(atm)/(K)(g mole) is an appropriate unit.
The given statement is
a) Correct
b) Incorrect
c) Can`t say
d) None of the mentioned

Answer: a [Reason:] Gas constant = R = PV/nT.

## Set 5

1. ___________is any measurable characteristics of a substance that can be calculated or deduced.
a) Property
b) State
c) Phase
d) None of the mentioned

Answer: a [Reason:] Property is any measurable characteristics of a substance that can be calculated or deduced.

2. ________ of a system gives the condition of a system as specified by its properties.
a) Property
b) State
c) Phase
d) None of the mentioned

Answer: b [Reason:] State of a system gives the condition of a system as specified by its properties.

3. A ________ is completely homogeneous and uniform state of matter
a) Property
b) State
c) Phase
d) None of the mentioned

Answer: c [Reason:] State of a system gives the condition of a system as specified by its properties.

4. A compound may consists of _______ phase.
a) Only one
b) Only two
c) Not more than two
d) One or more than one

Answer: d [Reason:] A compound may consists of one or more than one phase.

5. Mercury and water (Immiscible) in a same container would represent two different phases.
The statement is
a) Correct
b) Incorrect
c) Can`t say
d) None of the mentioned

Answer: a [Reason:] A compound may consists of one or more than one phase.

6. Incorrect equation for an ideal is
a) PV = nRT
b) Pv = RT
c) PM = ρRT
d) None of the mentioned
where: P – Absolute Pressure of the gas
V – Total volume occupied by the gas
n – Number of moles of the gas
T – Absolute temperature
v – Specific molar volume
ρ – Density of the gas

Answer: d [Reason:] All three are correct as a & b are ideal gas law and c is in the form of density.

7. For an ideal gas, the specific molar volume of the gas is doubled then the pressure would be (Other parameters are same)
a) Same as before
b) Double
c) Half
d) None of the mentioned

Answer: c [Reason:] Pressure and specific volumes are inversely proportional.

8. Specific molar volume for an ideal gas is
a) Volume per mass
b) Volume per molecular weight
c) Volume per mole
d) None of the mentioned

Answer: c [Reason:] Specific molar volume for an ideal gas is Volume per mole.

9. The inverse of molar volume is
a) Molar density
b) Mole fraction
c) Molar specific volume
d) None of the mentioned