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Soil Mechanics MCQs Questions & Answers | Geological Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Soil Mechanics. These resources are available for Geological engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Soil Mechanics chapter is particularly important for students studying Geological engineering. Page-3 section-1

21
The dry density of a compacted soil can be increased by:
Discuss
Answer & Solution
Answer: Option A
Solution:
Increasing compactive effort improves particle arrangement and reduces voids, increasing dry density up to a limit.
22
Which type of soil has negligible cohesion?
Discuss
Answer & Solution
Answer: Option A
Solution:
Gravel is a coarse-grained soil with no cohesion.It derives strength primarily from interparticle friction.
23
What happens to soil permeability as compaction increases?
Discuss
Answer & Solution
Answer: Option C
Solution:
Compaction reduces void spaces, thereby decreasing permeability and slowing water flow through soil.
24
The consistency index is calculated using:
Discuss
Answer & Solution
Answer: Option A
Solution:
Consistency index (Ic) = (Liquid limit - Natural water content) / (Plasticity index).It measures the firmness of soil in its natural state.
25
Which of the following has the highest permeability?
Discuss
Answer & Solution
Answer: Option D
Solution:
Gravel has large, interconnected pores, resulting in high permeability.It allows rapid water movement.
26
Which method is used to determine the moisture content of soil?
Discuss
Answer & Solution
Answer: Option B
Solution:
The pycnometer method is a standard lab technique used to determine moisture content in soil samples.
27
The unconfined compressive strength (UCS) test is best suited for:
Discuss
Answer & Solution
Answer: Option C
Solution:
The UCS test is performed without lateral confinement and is most applicable for cohesive soils like stiff clays.
28
Plasticity index of soil is:
Discuss
Answer & Solution
Answer: Option B
Solution:
Plasticity index (PI) = Liquid limit - Plastic limitIt indicates the range of moisture content where the soil behaves plastically.
29
In the compaction curve, the peak point represents:
Discuss
Answer & Solution
Answer: Option B
Solution:
The peak of the compaction curve indicates the optimum moisture content, which gives the highest dry density.
30
The slope of the e-log p curve in a consolidation test gives:
Discuss
Answer & Solution
Answer: Option A
Solution:
The compression index (Cc) is the slope of the e-log p curve, representing the compressibility of soil during primary consolidation.