Chemical Process Calculation Questions and Answers Part-8

1. A cube of ice is floating on water surface and when it completely melts, the level of water would _______
a) Increase
b) Decrease
c) Remains unchanged
d) None of the mentioned

Answer: c
Explanation: There is no change in the volume of the water as the space occupied by the ice inside the water body is filled with it.

2. An object is once immersed in oil and once in water. The loss in weight would be
a) More in water
b) More in oil
c) Equal in both oil and water
d) None of the mentioned

Answer: b
Explanation: Density of oil is more than water so there will be more buoyancy force.

3. Volume of the petroleum products changes with temperature so __________ is used to measure specific gravity.
a) Density
b) Specific volume
c) API gravity
d) None of the mentioned

Answer: c
Explanation: Volume of the petroleum products changes with temperature so API gravity is used to measure specific gravity.

4. ___________ is measured in Hydrometer scale.
a) API gravity
b) Specific gravity
c) Density
d) None of the mentioned

Answer: a
Explanation: API gravity is measured in Hydrometer scale.

5. If a block has dimensions 6 x 8 x 9 cm and the specific gravity is 2.3. What is the density?
a) 2.3 gm/cm3
b) 0.256 gm/cm3
c) 2.659 gm/cm3
d) .00568 gm/cm3

Answer: a
Explanation: Density of the block = specific gravity*Density of water (1 gm/cm3).

6. If a block has dimensions 6 x 8 x 9 cm and the specific gravity is 2.3. What is the mass of the block?
a) 99.36 Kg
b) 9.996 Kg
c) 0.9936 Kg
d) None of the mentioned

Answer: c
Explanation: Mass = density*Volume.

7. A substance has a mass of 20 kg and volume of 40 m3. The specific gravity of the substance is 0.80 kg/cm3. What is the reference density (Kg/m3)?
a) 0.25
b) 0.50
c) 0.75
d) 1.00

Answer: a
Explanation: Specific gravity = density of the substance / Reference density.

8. A material have a mass of 2 gms and volume of 4 cm3. The material would _____ on water surface.
a) Completely Float
b) Completely Sink
c) Partially Sink
d) None of the mentioned

Answer: b
Explanation: Specific gravity of the material is less than one.

9. A liquid is filled in a cylinder of height 5 cm. mass of the filled liquid is 40 gms. Specific gravity of the liquid is 20. What is the density of the liquid?
a) 10 gm/cm3
b) 20 gm/cm3
c) 30 gm/cm3
d) 40 gm/cm3

Answer: b
Explanation: Specific gravity = Density of the liquid / Density of water.

10. A liquid is filled in a cylinder of height 5 cm. mass of the filled liquid is 40 gms. Specific gravity of the liquid is 20. What is the radius of the cylinder?
a) 0.356 cm
b) 0.459 cm
c) 0.678 cm
d) 0.756 cm

Answer: a
Explanation: Volume = Mass / Density, Volume of the cylinder = 3.14*r*r*h.