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# Multiple choice question for engineering

## Set 1

1-10. A cylinder contains 56 gms of N2, 128 gms of O2 and 64 gms of SO2. (Molecular weights of the components are 28, 64 and 64 respectively)
1. How many moles of N2 are there in the cylinder?
a) 1
b) 2
c) 4
d) 6

Answer: b [Reason:] Number of moles = mass / molecular weight.

2. How many moles of O2 are there in the cylinder?
a) 1
b) 2
c) 4
d) 6

Answer: b [Reason:] Number of moles = mass / molecular weight.

3. How many moles of SO2 are there in the cylinder?
a) 1
b) 2
c) 4
d) 6

Answer: a [Reason:] Number of moles = mass / molecular weight.

4. What are the number moles of Oxgen present there in the cylinder?
a) 1
b) 2
c) 3
d) 4

Answer: c [Reason:] Number of moles of O2 = 2+1 = 3.

5. How many moles of Sulfur are there in the cylinder?
a) 1
b) 2
c) 4
d) 6

Answer: a [Reason:] Number of moles of Sulfur = No. of moles of SO2.

6. What is the mole fraction of N2?
a) 0.2
b) 0.4
c) 0.6
d) 0.8

Answer: b [Reason:] Mole fraction = Moles of the component / Total moles.

7. What is the mole fraction of O2?
a) 0.2
b) 0.4
c) 0.6
d) 0.8

Answer: b [Reason:] Mole fraction = Moles of the component / Total moles.

8. What is the mole fraction of SO2?
a) 0.2
b) 0.4
c) 0.6
d) 0.8

Answer: a [Reason:] Mole fraction = Moles of the component / Total moles.

9. What is weight percentage of N2?
a) 22.58
b) 25.86
c) 42.56
d) 54.87

Answer: a [Reason:] Weight percentage = mass of the component / Total mass.

10. What is weight percentage of O2?
a) 51.61
b) 61.71
c) 71.81
d) 81.91

Answer: a [Reason:] Weight percentage = mass of the component / Total mass.

## Set 2

1. The change of phase from liquid to vapour is
a) Condensation
b) Evaporation
c) Sublimation
d) None of the mentioned

Answer: b [Reason:] The change of phase from liquid to vapour is Evaporation.

2. Boiling occurs at ________ temperature and _______ pressure, the process appears as a point in ____ diagram.
a) Constant, constant, P-T
b) Variable, constant, P-T
c) Constant, variable, V-T
d) Variable, variable, V-T

Answer: a [Reason:] Boiling occurs at constant temperature and constant pressure, the process appears as a point in P-T diagram.

3. The change of phase from liquid to solid is
a) Freezing
b) Evaporation
c) Sublimation
d) None of the mentioned

Answer: a [Reason:] The change of phase from liquid to vapour is Freezing.

4. The temperature at which a liquid will begin to boil at the standard atmospheric pressure is
a) Normal boiling point
b) Normal melting point
c) Normal freezing point
d) None of the mentioned

Answer: a [Reason:] The temperature at which a liquid will begin to boil at the standard atmospheric pressure is Normal boiling point.

5. The temperature at which the solid melts at 1 atm is called
a) Normal boiling point
b) Normal melting point
c) Normal freezing point
d) None of the mentioned

Answer: b [Reason:] The temperature at which the solid melts at 1 atm is called Normal melting point.

6. Saturated liquid or saturated vapour can be found
a) Along the liquid and vapour equilibrium curve
b) Along the liquid and solid equilibrium curve
c) Along the solid and vapour equilibrium curve
d) None of the mentioned

Answer: a [Reason:] Saturated liquid or saturated vapour can be found along the liquid and vapour equilibrium curve.

7. The liquid between the melting curve and the vapour pressure curve is Sub-cooled liquid.
The above given statement is
a) False
b) True
c) Cannot be predicted for any material
d) None of the mentioned

Answer: b [Reason:] The liquid between the melting curve and the vapour pressure curve is Subcooled liquid.

8. Change in phase from solid to vapour
a) Melting
b) Boiling
c) Evaporation
d) Sublimation

Answer: d [Reason:] Change in phase from solid to vapour is Sublimation.

9. The pressure along the melting curve is
a) Sublimation pressure
b) Saturation pressure
c) Condensation pressure
d) None of the mentioned

Answer: a [Reason:] The pressure along the melting curve is Sublimation pressure.

10. Values of vapour at temperature and pressure exceeding those at saturation is
a) Superheated vapour
b) Sub-cooled vapour
c) Below critical point vapour
d) None of the mentioned

Answer: a [Reason:] Values of vapour at temperature and pressure exceeding those at saturation is Superheated vapour.

## Set 3

1. The change of phase from liquid to vapour is
a) Condensation
b) Evaporation
c) Sublimation
d) None of the mentioned

Answer: b [Reason:] The change of phase from liquid to vapour is Evaporation.

2. Boiling occurs at ________ temperature and _______ pressure, the process appears as a point in ____ diagram.
a) Constant, constant, P-T
b) Variable, constant, P-T
c) Constant, variable, V-T
d) Variable, variable, V-T

Answer: a [Reason:] Boiling occurs at constant temperature and constant pressure, the process appears as a point in P-T diagram.

3. The change of phase from liquid to solid is
a) Freezing
b) Evaporation
c) Sublimation
d) None of the mentioned

Answer: a [Reason:] The change of phase from liquid to vapour is Freezing.

4. The temperature at which a liquid will begin to boil at the standard atmospheric pressure is
a) Normal boiling point
b) Normal melting point
c) Normal freezing point
d) None of the mentioned

Answer: a [Reason:] The temperature at which a liquid will begin to boil at the standard atmospheric pressure is Normal boiling point.

5. The temperature at which the solid melts at 1 atm is called
a) Normal boiling point
b) Normal melting point
c) Normal freezing point
d) None of the mentioned

Answer: b [Reason:] The temperature at which the solid melts at 1 atm is called Normal melting point.

6. Saturated liquid or saturated vapour can be found
a) Along the liquid and vapour equilibrium curve
b) Along the liquid and solid equilibrium curve
c) Along the solid and vapour equilibrium curve
d) None of the mentioned

Answer: a [Reason:] Saturated liquid or saturated vapour can be found along the liquid and vapour equilibrium curve.

7. The liquid between the melting curve and the vapour pressure curve is Sub-cooled liquid.
The above given statement is
a) False
b) True
c) Cannot be predicted for any material
d) None of the mentioned

Answer: b [Reason:] The liquid between the melting curve and the vapour pressure curve is Subcooled liquid.

8. Change in phase from solid to vapour
a) Melting
b) Boiling
c) Evaporation
d) Sublimation

Answer: d [Reason:] Change in phase from solid to vapour is Sublimation.

9. The pressure along the melting curve is
a) Sublimation pressure
b) Saturation pressure
c) Condensation pressure
d) None of the mentioned

Answer: a [Reason:] The pressure along the melting curve is Sublimation pressure.

10. Values of vapour at temperature and pressure exceeding those at saturation is
a) Superheated vapour
b) Sub-cooled vapour
c) Below critical point vapour
d) None of the mentioned

Answer: a [Reason:] Values of vapour at temperature and pressure exceeding those at saturation is Superheated vapour.

## Set 4

1. The normal force per unit area that a fluid exerts on a surface is called
a) Normal Force
b) Pressure
c) Gauge pressure
d) None of the mentioned

Answer: b [Reason:] The normal force per unit area that a fluid exerts on a surface is called pressure.

2. Find out the correct statement
a) Pabsolute = Pgauge – Patmospheric
b) Pvacuum = Patmospheric + Pabsolute
c) Both and b are incorrect
d) Both and b are correct

Answer: c [Reason:] Pabsolute = Pgauge + Patmospheric and Pvacuum = Patmospheric – Pabsolute.

3. Pressure can`t be expressed as
a) N/m2
b) Pa/m2
c) atm
d) mm of Hg

Answer: b [Reason:] Pa is the unit of pressure, not Pa/m2.

4. 1 atm pressure is equal to
a) 101.3 kPa
b) 760 mm of Hg
c) 14.69 psi
d) All of the mentioned

Answer: d [Reason:] 1 atm = 101.3 kPa = 760 mm of Hg = 14.69 psi.

5. A static column of height h is filled with a liquid of density D. What is the static pressure at the bottom if the column is placed in open.
a) P* + Dgh
b) Dgh
c) P*
d) None of the mentioned

Answer: a [Reason:] Static pressure at the bottom = P* + Dgh.

6. For the given manometer

a) P1 + ρ1d2g = P2 + ρ2d2g
b) P1 + ρ1d1g = P2 + ρ2d2g
c) P1 + ρ1d1g = P2 + ρ2d2g + ρ3d3g
d) None of the mentioned

Answer: c [Reason:] P1 + ρ1d2g = P2 + ρ2d2g + ρ3d3g. For same liquid at same level, pressure will be always same.

7. A bucket is placed in vacuum that contains a 14 kg/m3 density fluid. The bucket is filled with a height of 5 m. What is the static pressure at the bottom of the bucket?
a) 484 Pa
b) 686 Pa
c) 888 Pa
d) 1000 Pa

Answer: b [Reason:] Pressure = Dgh = 14*9.81*5.

8. Two statement are given as below
I: 35 psia = 71.24 in Hg
II: Barometer is used for the measurement of vacuum pressure
a) I is correct and II is incorrect
b) II is correct and I is incorrect
c) Both are correct
d) Both are incorrect

Answer: a [Reason:] Barometer is used for the measurement of atmospheric pressure.

9. In barometer, the given space labelled as A, above the mercury is

a) Vacuum
b) Filled with Air
c) Filled with water
d) Filled with Gas

Answer: a [Reason:] To correctly measure the atmospheric pressure, the space above the mercury level in a barometer is essentially vacuum. Otherwise, the fluid in the space will exert a pressure on the mercury surface.

10. In the previous question
Air is trapped in the space (labelled A) above the mercury level in the tube of a barometer, which measures 750 mm Hg. If the atmospheric pressure is 760 mm Hg, then the pressure of the trapped air is
a) 15 mm Hg
b) 760 mm Hg
c) Between 745 and 760 mm Hg
d) 745 mm Hg

Answer: a [Reason:] Pressure of trapped air + Pressure of mercury column = Atmospheric Pressure.

## Set 5

1. The normal force per unit area that a fluid exerts on a surface is called
a) Normal Force
b) Pressure
c) Gauge pressure
d) None of the mentioned

Answer: b [Reason:] The normal force per unit area that a fluid exerts on a surface is called pressure.

2. Find out the correct statement
a) Pabsolute = Pgauge – Patmospheric
b) Pvacuum = Patmospheric + Pabsolute
c) Both and b are incorrect
d) Both and b are correct

Answer: c [Reason:] Pabsolute = Pgauge + Patmospheric and Pvacuum = Patmospheric – Pabsolute.

3. Pressure can`t be expressed as
a) N/m2
b) Pa/m2
c) atm
d) mm of Hg

Answer: b [Reason:] Pa is the unit of pressure, not Pa/m2.

4. 1 atm pressure is equal to
a) 101.3 kPa
b) 760 mm of Hg
c) 14.69 psi
d) All of the mentioned

Answer: d [Reason:] 1 atm = 101.3 kPa = 760 mm of Hg = 14.69 psi.

5. A static column of height h is filled with a liquid of density D. What is the static pressure at the bottom if the column is placed in open.
a) P* + Dgh
b) Dgh
c) P*
d) None of the mentioned

Answer: a [Reason:] Static pressure at the bottom = P* + Dgh.

6. For the given manometer

a) P1 + ρ1d2g = P2 + ρ2d2g
b) P1 + ρ1d1g = P2 + ρ2d2g
c) P1 + ρ1d1g = P2 + ρ2d2g + ρ3d3g
d) None of the mentioned

Answer: c [Reason:] P1 + ρ1d2g = P2 + ρ2d2g + ρ3d3g. For same liquid at same level, pressure will be always same.

7. A bucket is placed in vacuum that contains a 14 kg/m3 density fluid. The bucket is filled with a height of 5 m. What is the static pressure at the bottom of the bucket?
a) 484 Pa
b) 686 Pa
c) 888 Pa
d) 1000 Pa

Answer: b [Reason:] Pressure = Dgh = 14*9.81*5.

8. Two statement are given as below
I: 35 psia = 71.24 in Hg
II: Barometer is used for the measurement of vacuum pressure
a) I is correct and II is incorrect
b) II is correct and I is incorrect
c) Both are correct
d) Both are incorrect

Answer: a [Reason:] Barometer is used for the measurement of atmospheric pressure.

9. In barometer, the given space labelled as A, above the mercury is

a) Vacuum
b) Filled with Air
c) Filled with water
d) Filled with Gas