Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Density and specific gravity-II”.
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
Answer: a
Clarification: Specific gravity is the ratio of the density of a material to the density of a reference material.
2. Concentration of the material in kg/L in the exit stream
a) 0.3864
b) 0.2033
c) 4.0673
d) 0.7728
Answer: a
Clarification: Take 1 min. basis and then using the flow rate of liquid, density of liquid and percentage of material calculate the concentration.
3. Flow rate of the material in kg/min.
a) 0.262
b) 0.252
c) 0.242
d) 0.232
Answer: a
Clarification: Take 1 min. basis and then using molecular weight of material, flow rate and percentage of material, calculate flow rate.
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
Answer: a
Clarification: Inverse of density is specific volume.
5. The specific weight is also known as ________
a) Specific density
b) Specific volume
c) Weight density
d) None of the mentioned
Answer: c
Clarification: The specific weight is also known as weight density.
6. The specific gravity of water is taken as
a) 0.01
b) 0.1
c) 1
d) 10
Answer: c
Clarification: While measuring the specific gravity of liquids, it is measured with respect to water.
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
Answer: c
Clarification: Specific density is the ratio of two densities and when salt is added to water, a high density material is added so finally the density rises .
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
Answer: a
Clarification: With respect to water, the specific gravity is greater than one so the density of the object is more than that of water.
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
Answer: b
Clarification: Density is the ratio of mass and volume of the block.
10. Specific gravity is?
a) 0.625
b) 0.825
c) 1.125
d) 2.225
Answer: b
Clarification: Specific density = 0.825/1 = 0.825, where the density of water is 1 gm/cm3.