# Multiple choice question for engineering

## Set 1

1. What is the compressibility of ideal gases?

a) 1

b) 2

c) 3

d) 4

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2. Which of the following is true about compressibility of real gases?

a) Z = 1

b) Z < 1

c) Z > 1

d) Both Z < 1 and Z > 1

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3. What is the pressure of CO_{2} gas with compressibility z = 0.8, if the ideal gas pressure of CO_{2} is 10 Pa, all other variables are same?

a) 5

b) 8

c) 10

d) 14

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_{2}= 0.8*10 = 8 Pa.

4. What is the pressure of H_{2} with compressibility 0.6, molar volume 5 liter/mole at 27^{o}C?

a) 2.9 atm

b) 5.4 atm

c) 9.6 atm

d) 14.5 atm

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5. At what temperature, does SO_{2} with compressibility 2 has pressure 5 atm and molar volume 10 mole/s?

a) 300.5 K

b) 304.5 K

c) 310 K

d) 312.5 K

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6. What is the compressibility factor of water with density 1 g/liter at 27^{o}C and 1 atm?

a) 0.25

b) 0.59

c) 0.73

d) 0.91

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7. What is the compressibility factor of a liquid of molar mass 90 g and density 10 g/liter at 27^{o}C and 2 atm?

a) 0.14

b) 0.39

c) 0.51

d) 0.73

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8. What is the pressure of 80 grams of CH_{4} with compressibility 5, with 10 liter volume at 27^{o}C?

a) 10.5 atm

b) 28.9 atm

c) 44.2 atm

d) 61.5 atm

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9. What is the compressibility of methane with density 10 g/liter at 27^{o}C and 500 atm?

a) 32.5

b) 34.8

c) 39.6

d) 44.1

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10. What is the compressibility of neon (molar mass = 20) with density 20 g/liter at 27^{o}C and 100 atm?

a) 2.1

b) 3.5

c) 4

d) 6.8

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11. 90 g glucose is filled in a container at 10 atm, if the volume of container is 2 liter, what is the temperature of glucose (z = 1.5)?

a) 25.4^{o}C

b) 51.7^{o}C

c) 76.9^{o}C

d) 103.5^{o}C

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^{o}C.

12. How many grams of C_{2}H_{6} (z = 1.4) is present in the container at 27^{o}C and 5 atm and with volume 10 liter?

a) 20 g

b) 30.4 g

c) 40.6 g

d) 50.8 g

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_{2}H

_{6}= 1.45*28 = 40.6 g.

13. What is the volume of 21 g of propane (z = 1.9) at 1 atm and 27^{o}C?

a) 23.4 liter

b) 37.5 liter

c) 42.1 liter

d) 59.6 liter

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14. 1 mole of cyclohexane (z = 1.2) is filled in a container at 27^{o}C and 4 atm, what is the volume of container?

a) 3.8 liter

b) 4.4 liter

c) 5.6 liter

d) 7.4 liter

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15. 39 grams of benzene (z = 1.4) is filled in a container of volume 10 liter at 27^{o}C, what is the pressure of container?

a) 1.7 atm

b) 1.9 atm

c) 2.2 atm

d) 2.5 atm

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## Set 2

1. Which of the following is not the unit of concentration?

a) Mole/m^{3}

b) Molar

c) N/m^{3}

d) ppm

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^{3}cannot be a unit of concentration.

2. What is the concentration of a 22 grams of carbon dioxide occupying 0.5 m^{3} volume?

a) 1 mole/m^{3}

b) 2 mole/m^{3}

c) 11 mole/m^{3}

d) 22 mole/m^{3}

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^{3}.

3. What is the concentration of 100 lbs. of solution occupying 25 m^{3} of volume?

a) 1.8 Kg/m^{3}

b) 2.7 Kg/m^{3}

c) 4 Kg/m^{3}

d) 8 Kg/m^{3}

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^{3}.

4. What is the molarity of a solution with mass of solute 10 kg mass and 100 liter volume?

a) 0.1 molar

b) 1 molar

c) 10 molar

d) 100 molar

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5. What is the concentration of a solution with 10 grams of calcium in 1000 m^{3} of water?

a) 150 ppm

b) 250 ppm

c) 800 ppm

d) 1000 ppm

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^{6}= 250 ppm.

6. How much Sodium is there in a solution with 10 Kg of solvent (Density = 5 Kg/m^{3}) and concentration 4 molar?

a) 23 grams

b) 92 grams

c) 184 grams

d) 276 grams

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^{3}, => moles of sodium = 4*2 = 8 moles, => mass of sodium = 8*23 = 184 grams.

7. A 5 molar solution is 27.75% CaCl_{2} by mass, what is the density of the solution?

a) 1 g/cm^{3}

b) 2 g/cm^{3}

c) 3 g/cm^{3}

d) 4 g/cm^{3}

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_{2}= 27.75/111 = 0.25, Density of solution = 5*(100/0.25) = 2000 kg/m

^{3}= 2 g/cm

^{3}.

8. A solution with density 1 g/cm^{3} has 98 grams of H_{2}SO_{4} in 402 grams of water, what is the concentration of solution?

a) 1 molar

b) 2 molar

c) 3 molar

d) 4 molar

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_{2}SO

_{4}= 98/98 = 1, => concentration of solution = 1/(500/1) = 2*10

^{-6}mole/cm

^{3}= 2 molar.

9. A solution with density 2 g/cm^{3}, concentration 1 molar and weight 500 grams, then what is the mass of HNO_{3} in the solution?

a) 63 grams

b) 126 grams

c) 189 grams

d) 252 grams

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_{3}= 1/(500/2000) = 4, = > mass of HNO

_{3}= 4*63 = 252 grams.

10. What is the molarity of the mixture of two solution, first solution 4 M and 10 liter and second solution 2 M and 40 liter?

a) 1.2 M

b) 2.4 M

c) 4.8 M

d) 9.2 M

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_{1}V

_{1}+ M

_{2}V

_{2})/(V

_{1}+ V

_{2}) = (4*10 + 2*40)/ (10 + 40) = 2.4 M.

11. What is the molar concentration of a solution with 40 gram of NaOH in 1 liter solution?

a) 1 mole/liter

b) 2 mole/liter

c) 3 mole/liter

d) 4 mole/liter

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12. What is the molar concentration of a solution with 32 grams of CH_{4} in 1 liter solution?

a) 1 mole/liter

b) 2 mole/liter

c) 3 mole/liter

d) 4 mole/liter

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13. What is the molar concentration of a solution with 44 grams of CO_{2} in 0.5 liter solution?

a) 1 mole/liter

b) 2 mole/liter

c) 3 mole/liter

d) 4 mole/liter

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14. What is the molar concentration of a solution with 32 grams of SO2 in 0.5 liter solution?

a) 1 mole/liter

b) 2 mole/liter

c) 3 mole/liter

d) 4 mole/liter

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15. What is the molar concentration of a solution with 49 grams of H_{2}SO_{4} in 0.5 liter solution?

a) 1 mole/liter

b) 2 mole/liter

c) 3 mole/liter

d) 4 mole/liter

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## Set 3

1. Which of the following defines condensation?

a) Change of solid to vapor

b) Change of vapor to liquid

c) Change of liquid to vapor

d) Change of vapor to solid

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2. Which of the following is not a way of condensation of vapor?

a) Cooling at constant volume

b) Cooling at constant pressure

c) Compress it isothermally

d) Compress it

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3. Condensation starts at which point?

a) Dew point

b) Bubble point

c) Triple point

d) None of the mentioned

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4. If the fraction of water vapor at 27^{o}C and 5 atm is 0.5, then what is the fraction of water vapor at 27^{o}C and 1 atm?

a) 0.1

b) 0.2

c) 0.5

d) 0.8

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^{o}C and 1 atm = 0.5/5 = 0.1.

5. What is the fraction of water vapor at 27^{o}C and 1 atm, if the fraction of water vapor at 127^{o}C and 1 atm is 0.8?

a) 0.2

b) 0.4

c) 0.6

d) 0.8

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^{o}C and 1 atm = 0.8*300/400 = 0.6.

6. A process is carried out for the feed mixture of 90% air and 10% water vapor, the compressor recovered 90% of water, what is the exit pressure of the compressor, if the partial pressure of water vapor is 50 mm Hg?

a) 286.1 mm Hg

b) 396.4 mm Hg

c) 458.7 mm Hg

d) 529.5 mm Hg

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7. A process is carried out for the feed mixture of 95% air and 5% ammonia vapor, the compressor recovered 40% of ammonia, what is the exit pressure of the compressor, if the partial pressure of ammonia vapor is 10 mm Hg?

a) 225.4 mm Hg

b) 326.8 mm Hg

c) 451.2 mm Hg

d) 593.5 mm Hg

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8. A process is carried out for the feed mixture of 80% air and 20% CO_{2}, the compressor recovered 50% of CO_{2}, what is the exit pressure of the compressor, if the partial pressure of CO_{2} is 15 mm Hg?

a) 135 mm Hg

b) 145 mm Hg

c) 175 mm Hg

d) 200 mm Hg

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_{2}: 0.2*0.5 = 0.1, air: 0.8, => yCO

_{2}= 0.1/0.9 = 0.111, => Total exit pressure = 15/0.111 = 135 mm Hg.

9. A process is carried out for the feed mixture of 50% air and 50% methane vapor, the compressor recovered 20% of methane, what is the exit pressure of the compressor, if the partial pressure of methane vapor is 25 mm Hg?

a) 56.3 mm Hg

b) 78.9 mm Hg

c) 92.1 mm Hg

d) 98.7 mm Hg

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10. A process is carried out for the feed mixture of 40% air and 60% oxygen, the compressor recovered 2% of oxygen, what is the exit pressure of the compressor, if the partial pressure of oxygen vapor is 5 mm Hg?

a) 2.4 mm Hg

b) 4.8 mm Hg

c) 6.5 mm Hg

d) 8.4 mm Hg

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## Set 4

1. What are the degrees of freedom?

a) Total variables in the process

b) Total species in the process

c) Total reactions in the process

d) None of the mentioned

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2. What are the total degrees of freedom if the number of species are 5, total streams are 2, stream temperature 2, stream pressure 2 and heat released 1?

a) 1

b) 5

c) 6

d) 12

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3. What are the total degrees of freedom if the number of species are 8, total streams are 3, stream temperature 3, stream pressure 3 and heat released 1, extent of reaction 2?

a) 8

b) 12

c) 15

d) 17

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4. What are the total degrees of freedom if the number of species are 4, total streams are 2, stream temperature 2, stream pressure 1 and heat released 1, extent of reaction 1?

a) 4

b) 7

c) 11

d) 15

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5. What are the total degrees of freedom if the number of species are 8, total streams are 4, stream temperature 2, stream pressure 2 and heat released 1, extent of reaction 3?

a) 12

b) 16

c) 20

d) 24

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6. In a reactor two stream are entering, one with CH_{4} at 10 atm and 27^{o}C, and another with O2 at 10 atm and 0^{o}C, producing CO_{2}, CO, H_{2}O, and O_{2} at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 12

b) 16

c) 18

d) 20

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7. In a reactor two stream are entering, one with H_{2} at 10 atm and 27^{o}C, and another with O_{2} at 10 atm and 0^{o}C, producing H_{2}O_{2}, H_{2}O, and O_{2} at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 12

b) 17

c) 19

d) 23

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8. In a reactor two stream are entering, one with N_{2} at 10 atm and 27^{o}C, and another with O2 at 10 atm and 0^{o}C, producing NO, NO_{2}, NO_{3}, and O_{2} at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 12

b) 17

c) 19

d) 21

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9. In a reactor two stream are entering, one with S at 10 atm and 27^{o}C, and another with O_{2} at 10 atm and 0^{o}C, producing SO_{2}, SO_{3}, and O_{2} at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 10

b) 13

c) 15

d) 17

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10. In a reactor two stream are entering, one with H_{2} at 10 atm and 27^{o}C, and another with O_{2} at 10 atm and 0^{o}C, producing H_{2}O at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 10

b) 14

c) 16

d) 19

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11. If the reactions are unknown, is it possible to determine the degrees of freedom?

a) Yes

b) No

c) Depends on the type of reaction

d) None of the mentioned

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12. In a reactor two stream are entering, one with CH_{4} at 10 atm and 27^{o}C, and another with O_{2} at 10 atm and 0^{o}C, producing CO_{2} and H_{2}O at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 10

b) 12

c) 15

d) 17

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13. In a reactor two stream are entering, one with C_{6}H_{6} at 10 atm and 27^{o}C, and another with H_{2} at 10 atm and 0^{o}C, producing C_{6}H_{12} and H_{2} at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 10

b) 15

c) 20

d) 23

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14. In a reactor two stream are entering, one with C_{6}H_{6} at 10 atm and 27^{o}C, and another with H_{2} at 10 atm and 0^{o}C, producing C_{6}H_{6}, C_{6}H_{12}, and H_{2} at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 10

b) 12

c) 15

d) 16

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15. In a reactor two stream are entering, one with CO_{2} at 10 atm and 27^{o}C, and another with H_{2}O at 10 atm and 0^{o}C, producing CH_{4}, CO_{2}, H_{2}O, and O_{2} at 10 atm and 23^{o}C, what are the total degrees of freedom?

a) 10

b) 15

c) 17

d) 21

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## Set 5

1. Which of the following is not a unit of density?

a) Kg/m^{3}

b) N/m^{3}

c) N.s^{2}/m^{4}

d) g/cm^{3}

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^{1}L

^{-3}, which is not the dimension of N/m

^{3}, so N/m

^{3}is not the unit of density.

2. What is the density of a substance of mass 10 grams and volume 5 liters?

a) 2 kg/m^{3}

b) 20 kg/m^{3}

c) 200 kg/m^{3}

d) 2000 kg/m^{3}

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^{-3})/(5*10

^{-3}) = 2 kg/m

^{3}.

3. A solid of density d is dropped in a liquid of density D, if d>D then,

a) Solid will completely sink

b) Solid will completely float

c) Solid will partially sink

d) None of the mentioned

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4. A liquid of mass 10 kg is enclosed in a cylinder of radius 1 m and length 5 m, what is the density of liquid?

a) 0.54 kg/m^{3}

b) 0.44 kg/m^{3}

c) 0.63 kg/m^{3}

d) 0.83 kg/m^{3}

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^{2})5 = 5π m

^{3}, => Density = 10/5π = 0.63 kg/m

^{3}.

5. What is the density of a liquid of mass 20 kg, enclosed in a cuboid of surface areas of three sides as 1 m^{2}, 2 m^{2}, 5 m^{2}, and one of its sides is 2 m?

a) 1 kg/m^{3}

b) 2 kg/m^{3}

c) 3 kg/m^{3}

d) 4 kg/m^{3}

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^{3}, density = 20/10 = 2 kg/m

^{3}.

6. What is the density of a liquid of mass 10 kg and contained in a cylinder of radius 5 m and surface area (excluding top and bottom) of 10π m^{2}?

a) 0.2π kg/m^{3}

b) 0.4π kg/m^{3}

c) 0.5π kg/m^{3}

d) 0.6π kg/m^{3}

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^{2})1 = 25π, => density of liquid = 10/25π = 0.4π kg/m

^{3}.

7. What is the mass of a liquid having density 20 kg/m^{3}, enclosed in a sphere of radius 1 m?

a) 80.7 kg

b) 83.7 kg

c) 85.7 kg

d) 88.7 kg

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^{3}= 4.18 m

^{3}, => mass of liquid = 20*4.18 = 83.7 kg.

8. What is the mass of a cube having surface area 24 m^{2}, and density 1 kg/m^{3}?

a) 1 kg

b) 2 kg

c) 4 kg

d) 8 kg

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^{0.5}= 2 m, => mass of cube = 1*2

^{3}= 8 kg.

9. An empty vessel has with mass 5 kg with volume 0.1 m^{3}, is now completely filled with a liquid of density 100 kg/m^{3}, what is the final density of the cylinder?

a) 50 kg/m^{3}

b) 100 kg/m^{3}

c) 150 kg/m^{3}

d) 200 kg/m^{3}

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^{3}.

10. A cylinder completely filled with water has density = 10 kg/m^{3} and volume 5 m^{3} , now a cube with side 1 m and density 25 kg/m^{3} is dipped into the cylinder with some water dropping out, what is the final density of cylinder?(neglect the mass of cylinder)

a) 13 kg/m^{3}

b) 15 kg/m^{3}

c) 17 kg/m^{3}

d) 19 kg/m^{3}

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^{3}.