# Chemical Process Calculation Questions and Answers – Density and specific gravity-I

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This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Density and specific gravity-I”.

1. Mass per unit volume is called
a) Density
b) Molecular weight
c) Molar mass
d) Mole fraction

Explanation: Mass per unit volume is called density.

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

Explanation: Densities for liquids and solids do not change significantly at ordinary conditions with pressure.

3. Specific volume is the inverse of
a) Volume
b) Pressure
c) Density
d) Flow rate

Explanation: Specific volume is the inverse of density.
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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

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

5. Density of water is
a) 1 gm/cm3
b) 1000 Kg/m3
c) 62.43 lb/ft3
d) All of the mentioned

Explanation: density of water = 1 gm/cm3 = 1000 Kg/m3 = 62.43 lb/ft3.

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

Explanation: Simple rule for the representation.

7-8. Specific gravity of a liquid is 2.39.
7. What is the density of the liquid in g/cm3?
a) 2.39
b) 2.39102
c) 2.39×103
d) None of the mentioned

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

8. What is the density of the liquid in kg/m3?
a) 2.39×103
b) 2.39
c) 2.39×102
d) None of the mentioned

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

9. Specific gravity of a substance is 2.42. What is the density of the substance in lb/ft3?
a) 151
b) 252
c) 302
d) 402

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

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/cm3
b) 20 gm/cm3
c) 10 gm/cm3
d) None of the mentioned

Explanation: Mass per unit volume is called density.

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