# Multiple choice question for engineering

## Set 1

1. Mass per unit volume is called

a) Density

b) Molecular weight

c) Molar mass

d) Mole fraction

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2. Densities for ________ and ________do not change significantly at ordinary conditions with pressure.

a) Gas, liquids

b) Liquids, solids

c) Solids, gas

d) None of the mentioned

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3. Specific volume is the inverse of

a) Volume

b) Pressure

c) Density

d) Flow rate

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4. Specific gravity is the ratio of density of a substance to the density of a reference material.

The above given statement is

a) True

b) False

c) Only for some specific materials

d) None of the mentioned

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5. Density of water is

a) 1 gm/cm^{3}

b) 1000 Kg/m^{3}

c) 62.43 lb/ft^{3}

d) All of the mentioned

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^{3}= 1000 Kg/m

^{3}= 62.43 lb/ft

^{3}.

6. Specific gravity = 0.80 26˚/4˚ notation represents

a) Specific gravity when the solution is at 26˚C and the reference substance is at 4˚C is 0.80

b) Specific gravity when the solution is at 4˚C and the reference substance is at 26˚C is 0.80

c) Both a and b

d) Neither a nor b

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7-8. Specific gravity of a liquid is 2.39.

7. What is the density of the liquid in g/cm^{3}?

a) 2.39

b) 2.3910^{2}

c) 2.39×10^{3}

d) None of the mentioned

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8. What is the density of the liquid in kg/m3?

a) 2.39×10^{3}

b) 2.39

c) 2.39×10^{2}

d) None of the mentioned

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9. Specific gravity of a substance is 2.42. What is the density of the substance in lb/ft^{3}?

a) 151

b) 252

c) 302

d) 402

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10. Mass that a cube contains is 40 gm and having side length of 1 cm. What is the density of the material inside the cube?

a) 40 gm/cm^{3}

b) 20 gm/cm^{3}

c) 10 gm/cm^{3}

d) None of the mentioned

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## Set 2

1-3. A material having molecular weight 190, in the production of the given material the exit stream from the reactor containing water and the drug flows at a rate of 15.5 L/min. The material concentration is 32.2% in water. The specific gravity of the solution is 1.2.

1. What is density g/cm3 of the solution?

a) 1.2

b) 0.83

c) 12.4

d) 2.5

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2. Concentration of the material in kg/L in the exit stream

a) 0.3864

b) 0.2033

c) 4.0673

d) 0.7728

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3. Flow rate of the material in kg/min.

a) 0.262

b) 0.252

c) 0.242

d) 0.232

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4. The density of material is 5 kg/cm3. What is its specific volume cm3/kg?

a) 0.2

b) 0.5

c) 5.0

d) 1.0

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5. The specific weight is also known as ________

a) Specific density

b) Specific volume

c) Weight density

d) None of the mentioned

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6. The specific gravity of water is taken as

a) 0.01

b) 0.1

c) 1

d) 10

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7. Two statements are given as

I: Specific density is dimensionless.

II: When salt is added to water, density of the solution will increase.

Number of correct statement is

a) 0

b) 1

c) 2

d) None of the mentioned

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8. An object has specific gravity greater than 1. When it is kept on the surface of water, the object would

a) Sink

b) Float

c) Half part of the object floats

d) None of the mentioned

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9-10. A rectangular block measures 2 x 5 x 8 centimetres. Mass of the block is 66 grams.

9. Density of the block is?

a) 0.625 gm/cm3

b) 0.825 gm/cm3

c) 1.125 gm/cm3

d) 2.225 gm/cm3

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10. Specific gravity is?

a) 0.625

b) 0.825

c) 1.125

d) 2.225

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## Set 3

1-3. A material having molecular weight 190, in the production of the given material the exit stream from the reactor containing water and the drug flows at a rate of 15.5 L/min. The material concentration is 32.2% in water. The specific gravity of the solution is 1.2.

1. What is density g/cm3 of the solution?

a) 1.2

b) 0.83

c) 12.4

d) 2.5

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2. Concentration of the material in kg/L in the exit stream

a) 0.3864

b) 0.2033

c) 4.0673

d) 0.7728

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3. Flow rate of the material in kg/min.

a) 0.262

b) 0.252

c) 0.242

d) 0.232

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4. The density of material is 5 kg/cm3. What is its specific volume cm3/kg?

a) 0.2

b) 0.5

c) 5.0

d) 1.0

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5. The specific weight is also known as ________

a) Specific density

b) Specific volume

c) Weight density

d) None of the mentioned

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6. The specific gravity of water is taken as

a) 0.01

b) 0.1

c) 1

d) 10

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7. Two statements are given as

I: Specific density is dimensionless.

II: When salt is added to water, density of the solution will increase.

Number of correct statement is

a) 0

b) 1

c) 2

d) None of the mentioned

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8. An object has specific gravity greater than 1. When it is kept on the surface of water, the object would

a) Sink

b) Float

c) Half part of the object floats

d) None of the mentioned

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9-10. A rectangular block measures 2 x 5 x 8 centimetres. Mass of the block is 66 grams.

9. Density of the block is?

a) 0.625 gm/cm3

b) 0.825 gm/cm3

c) 1.125 gm/cm3

d) 2.225 gm/cm3

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10. Specific gravity is?

a) 0.625

b) 0.825

c) 1.125

d) 2.225

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## Set 4

1-3. Volume representation of a real gas is given by the equation

V = aT + bTP + cTPn Litre

Where: a,b,c are constants and T, P, n are temperature, pressure and number of moles respectively.

If the equation is dimensionally consistent then

1. What is the unit of a?

a) L/K

b) L/(K)(atm)

c) L/(K)(atm)(mole)

d) None of the mentioned

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2. What is the unit of b?

a) L/K

b) L/(K)(atm)

c) L/(K)(atm)(mole)

d) None of the mentioned

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3. What is the unit of c?

a) L/K

b) L/(K)(atm)

c) L/(K)(atm)(mole)

d) None of the mentioned

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4. A relation of distance with time is given as d = 25(1-exp(-0.021t)) µm where d is in microns and t in seconds. What is the relation if d is in inches and t in minutes?

a) 25(1-exp(-0.021t)) in

b) 1.64(1-exp(0.26t)) in

c) 3.84(1-exp(0.26t)) in

d) 9.84(1-exp(1.26t)) in

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5. Given relation are-

A. T = 4π[l/g]^{0.5}

Where: l- length, g- gravity, T- time period of a pendulum

B. ∆P = v2*(L/D)

Where: ∆P- Pressure drop, L- length of pipe and D- Diameter of the pipe

Having dimensional consistency

a) 1

b) 2

c) Both 1 and 2

d) Neither 1 nor 2

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6. For dimensional consistency each term in an equation must have the same net dimension and unit as every other term to which it is added or subtracted or equated.

The above given statement is

a) False

b) True

c) Not mandatory

d) None of the mentioned

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7. A collection of variables or parameters that has no net dimensions or units are called

a) Dimensionless group

b) Dimensional group

c) Derived dimension group

d) None of the mentioned

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8. Find out the dimensionless quantity

a) Pressure

b) Reynolds number

c) Viscosity

d) Density

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9-10. Pressure relation of a real gas is given by the equation P = Aexp(B/T) atm. Where A and B are constants and T is the temperature of the gas.

9. What is the unit of A?

a) atm

b) K

c) 1/atm

d) 1/K

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10. What is the unit of B?

a) atm

b) K

c) 1/atm

d) 1/K

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## Set 5

1-3. For the given hydro-cracking problem, mole percent of products C4H10, C_{3}H_{8} and C2H6 are 20.2%, 58.4% and 21.4% respectively.

1. What is the mole percent of C6H14 in the feed?

a) 40.2

b) 50.2

c) 60.2

d) 70.2

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2. What is the mole percent of H_{2} in the feed?

a) 59.2

b) 49.2

c) 39.2

d) 29.9

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3. Molar ratio of H_{2} consumed to Hexane reacted in the process?

a) 1.2

b) 1.4

c) 1.6

d) 1.8

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4-6. For producing 40 % Methane, 20% Ethane and 40% Butane, a reactor is feed with Pentane and Hydrogen.

4. What is the mole fraction of Hydrogen in the feed?

a) 0.284

b) 0.484

c) 0.684

d) 0.884

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5. What is the mole fraction of Pentane in the feed?

a) 0.315

b) 0.215

c) 0.115

d) None of the mentioned

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6. What is the ratio of Hydrogen to the Pentane in the feed?

a) 1.167

b) 2.167

c) 3.167

d) 4.167

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7-10. C_{3}H_{8} is burned in air with a composition of 40 moles and 100 moles.

7. What is the number of moles of CO_{2} in the product?

a) 12.6

b) 10.6

c) 8.6

d) 4.6

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_{2}= Extent of the reaction*3.

8. What is the number of moles of H_{2}O in the product?

a) 4.8

b) 8.8

c) 16.8

d) 32.8

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_{2}O = Extent of the reaction*2.

9. What is the number of moles of C_{3}H_{8} in the product?

a) 25.8

b) 35.8

c) 45.8

d) 55.8

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_{3}H

_{8}= 40-Extent of the reaction.

10. How many moles of O_{2} are required for the complete combustion of C_{3}H_{8}?

a) 160.48

b) 170.48

c) 180.48

d) 190.48