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Basic Chemical Engineering Mcqs

Q:

Which of the following term does not involve in ideal gas law?

A) Pressure B) Volume
C) Temperature D) Time
 
Answer & Explanation Answer: D) Time

Explanation: Ideal gas law is PV = nRT, which does not involve time.

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206
Q:

10 Kg/s of a fluid with density 10 Kg/m3 is passed into a tank of capacity 50 m³, how much time will it take to fill the tank?

A) 5 Second B) 50 Second
C) 500 Second D) 5000 Second
 
Answer & Explanation Answer: B) 50 Second

Explanation: Flow rate of fluid = 10/10 = 1 m³/s, => Time = 50/1 = 50 second.

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169
Q:

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

A) 0.1 molar B) 1 molar
C) 10 molar D) 100 molar
 
Answer & Explanation Answer: A) 0.1 molar

Explanation: Molarity = 10/100 = 0.1 molar.

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152
Q:

What is the pressure of a 5 liter/mole ideal gas at temperature 27?C?

A) 2.5 atm B) 3.8 atm
C) 4.4 atm D) 5.3 atm
 
Answer & Explanation Answer: D) 5.3 atm

Explanation: PV = nRT, => P*5 = 0.0821*300, => P = 5.3 atm.

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142
Q:

Which of the following is not conserved for the flow of an incompressible liquid in a pipe with variable area?

A) Mass B) Volume
C) Velocity D) Flow Rate
 
Answer & Explanation Answer: C) Velocity

Explanation: According to the equation of continuity, the product of area and velocity remains constant throughout the pipe, since the area of the pipe is variable, so the velocity if the liquid is variable.

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140
Q:

It is necessary to mention the temperature at which specific gravity is calculated, because

A) Mass of the substance changes with temperature B) Rigidity of the substance changes with temperature
C) Density of the substance changes with temperature D) None of the mentioned
 
Answer & Explanation Answer: C) Density of the substance changes with temperature

Explanation: Since the volume of the substance changes with temperature, which means density of the substance changes with temperature, that’s why it is required to mention the temperature at which specific gravity is calculated.

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134
Q:

If the mole fraction of sodium is 0.25 in 9 moles of liquid carbon dioxide, what is the mass fraction of sodium?

A) 0.10 B) 0.15
C) 0.20 D) 0.25
 
Answer & Explanation Answer: B) 0.15

Explanation: 0.25 = n/(n + 9), => n = 3, => mass of sodium = 3*23/(3*23 + 9*44) = 0.15.

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133
Q:

50 Kg of a solid liquid mixture containing 10% solid and 90% water is left open in an atmosphere, after some time the water is 80%, what is the weight of the mixture now?

A) 10 Kg B) 25 Kg
C) 35 Kg D) 50 Kg
 
Answer & Explanation Answer: B) 25 Kg

Explanation: Let the new weight of mixture be P. Solid balance: 0.1(50) = 0.2P, => P = 25 Kg.

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