Engineering Questions with Answers - Multiple Choice Questions
Compaction Introduction
1 - Question
Compaction decreases the porosity.
a) True
b) False
View Answer
Answer: a
Explanation: Compaction is a process by which the soil particles are artificially rearranged into a closer state. This arrangement reduces the voids ratio and hence there is decrease in the porosity.
2 - Question
Dry density of soil is increased by _________
a) compaction
b) swelling
c) bulking
d) addition of excess of water
View Answer
Answer: a
Explanation: Compaction is a process by which the soil particles are artificially rearranged into a closer state which reduces the voids ratio and hence there is decrease in the porosity. Due to this, the dry density of the soil sample is increased.
3 - Question
Which of the following does not causes compaction?
a) vibration
b) tamping
c) rolling
d) adding excess water
View Answer
Answer: d
Explanation: When the water is added to the soil sample, it first occupies the voids present in between the soil particles. When excess of water is added to the soil sample, then swelling of the sand takes place, hence reducing its compaction.
Explanation: When the water is added to the soil sample, it first occupies the voids present in between the soil particles. When excess of water is added to the soil sample, then swelling of the sand takes place, hence reducing its compaction.
4 - Question
In 1933, ____________ showed the existence of relationship between soil water content and degree of dry density.
a) Terzaghi
b) Skempton
c) Darcy
d) Proctor
View Answer
Answer: d
Explanation: In 1933, Proctor showed the existence of relationship between soil water content and degree of dry density to which a soil might be compacted. Darcy is recognised for his woks in the field of permeability of the soil.
5 - Question
At Optimum water content, soil has _____
a) minimum density
b) maximum density
c) no weight
d) no density
View Answer
Answer: b
Explanation: In 1933, Proctor showed that for a specific amount of compaction energy applied on the soil, there was a water content termed as Optimum water content at which the soil attains the maximum density.
6 - Question
To test the compaction characteristics, the method are based on ______
a) dynamic loading only
b) kneading only
c) vibration loads only
d) dynamic, static, kneading
View Answer
Answer: d
Explanation: There are many methods available for the test of compaction and these tests are based on the types of compaction and these are:
- dynamic or impact
- kneading
- static and vibration.
7 - Question
The Standard Proctor test was developed by ________
a) R.R. Proctor
b) Skempton
c) Darcy
d) Terzaghi
View Answer
Answer: a
Explanation: In 1933, Proctor showed the existence of relationship between soil water content and degree of dry density to which a soil might be compacted. He developed the Standard Proctor test for the construction of the earth fill dams in the state of California.
8 - Question
In Standard Proctor test, the inside diameter of the mould is ________ inches.
a) 1
b) 4
c) 3
d) 6
View Answer
Answer: b
Explanation: In Standard Proctor test, the test equipment is a cylindrical metal mould that has an internal diameter of 4 inches or 10.15 cm.
9 - Question
In Standard Proctor test internal effective height is ________ inches.
a) 2.3
b) 4.5
c) 4.6
d) 45
View Answer
Answer: c
Explanation: In Standard Proctor test, the test equipment is a cylindrical metal mould that has an internal effective height of 4.6 inches or 11.7 cm.
10 - Question
In Standard Proctor test, the capacity of the mould is ________ cu.ft.
a) 1/10
b) 1/20
c) 1/30
d) 1/40
View Answer
Answer: c
Explanation: In Standard Proctor test, the test equipment is a cylindrical metal mould that has an internal effective height of 4.6 inches and an internal diameter of 4 inches. Therefore the volume of the cylinder is, πr2 h=π*42*4.6 cu.in=130 cu.ft.
11 - Question
In Standard Proctor test, the weight of rammer is ________
a) 4.5 kg
b) 18 lb
c) 2.5kg
d) 20 lb
View Answer
Answer: c
Explanation: In Standard Proctor test, the layers of the specimen are tested with a free fall of rammer of weight 2.5 kg or 5.5 lb. The test consists in compacting at various water contents.
12 - Question
In Standard Proctor test, the free fall height is ________ inches.
a) 5
b) 12
c) 16
d) 18
View Answer
Answer: b
Explanation: In Standard Proctor test, the layers of the specimen are tested with a free fall of rammer of weight 2.5 kg or 5.5 lb with the height of free fall being 12 inches or 310 mm.
13 - Question
The void ratio is increased by compaction.
a) True
b) False
View Answer
Answer: b
Explanation: Compaction is a process by which the soil particles are artificially rearranged and packed together in a closer state of contact by mechanical means. This arrangement reduces the porosity of the specimen and hence the voids ratio.
14 - Question
The compaction reduces _________
a) strength
b) stability
c) air voids
d) dry density
View Answer
Answer: c
Explanation: When the soil is compacted, it reduces the voids ratio and also its porosity. Hence the sir voids are reduced by the compaction process. The compaction increases the strength, stability and the dry density of the specimen.
15 - Question
_______ is a process in which soil particles are artificially rearrange into a close state.
a) Tension
b) Compaction
c) Sway mechanism
d) Consolidation
View Answer
Answer: b
Explanation: Compaction is a process by which the soil particles are artificially rearranged and packed together in a closer state of contact by mechanical means. While, consolidation is the natural process of reduction in the voids ratio of the specimen.