Soil Mechanics and Foundation Engineering (General Engineering) (SSC JE)

Total Questions: 50

1. A grid obtained by drawing a series of equipotential lines and stream lines is known as__. [JSSC JE (GEN. ENGG.) 04.11.2022 ]

Correct Answer: (b) flow net
Solution:

The flow lines and equipotential line together from a flow net. The flow net gives a pictorial representation of the path taken by water particles and the head variation along that path.

2. According to Indian standard procedure, what is the height of a 2.6 kg rammer that is to be dropped above the soil for preparing the sample to find dry density? [JSSC JE (GEN. ENGG.) 04.11.2022 ]

Correct Answer: (b) 310 mm
Solution:

3. As per Indian Standard Classification, soils can be classified into how many groups? [JSSC JE (GEN. ENGG.)- 31.10.2022 ]

Correct Answer: (d) 18
Solution:

As per Indian Standard Classification, soils can be classified into 18 groups.
Classification of Coarse grained soil (ISC System)

4. A steep particle size distribution curve is obtained for: [JSSC JE (GEN. ENGG.)- 31.10.2022 ]

Correct Answer: (a) uniform soil
Solution:

• A steep curve indicates a soil containing the particles of almost the same size. Such soils are known as uniform soils.
• A flat 5 curve represents a soil which contains the particles of different sizes in good proportion. Such a soil is called a well graded (uniformly graded) soil.
• A curve with hump represents the soil in which some of the intermediate size particles are missing. Such a soil is called gap-graded or skip graded.

5. Which of the following factors does NOT influence the achieved degree of compaction in the laboratory? [JSSC JE (GEN. ENGG.)-23.10.2022 ]

Correct Answer: (c) Temperature
Solution:Factors affecting compaction
According to proctor (1933), the degree of compaction a given soil can achieve depends on three factors–
1. Water content
2. Compactive effort
3. Soil type (coarse grained versus fine grained, grain size distribution, amount and type of clay minerals)
4. Plasticity of the soil

6. The pile capacity determined is from SPT. SPT stands for : [JSSC JE (GEN. ENGG.)-23.10.2022 ]

Correct Answer: (b) Standard Penetration Test
Solution:

The pile capacity determined is from SPT. Then SPT stands for Standard Penetration Test. In Situ Penetration Test for pile capacity
(a) Standard Penetration Test–The load carrying capacity of a pile can be estimated from the standard penetration test value (N)

7. Which among the following is an incorrect option? [JSSC JE (GEN. ENGG.)- 03.07.2022 ]

Correct Answer: (b) Loess is a soil type, which falls under over consolidated clay
Solution:

Loess– A loose deposit of wind blown silt that has been weakly cemented with montmorillonite. Loess is formed in arid and semi-arid regions and stand bank. So option (b) is an incorrect option.

8. What is the effect of increase in the amount of compactive effort? [JSSC JE (GEN. ENGG.)- 03.11.2022 ]

Correct Answer: (b) Decrease in optimum moisture content
Solution:

Factor affecting compaction– On increasing the compactive effort, optimum moisture content decreases and maximum dry density increases.

• Compactive effort is a measure of mechanical energy applied to soil mass. The degree of compaction of a soil is characterised by its dry density.
• One is the water content at which a particular soil attains maximum dry density.

9. The gross pressure at the base of the foundation at which the soil fails in shear is known as: [JSSC JE (GEN. ENGG.)- 03.11.2022 ]

Correct Answer: (d) ultimate bearing capacity
Solution:

The gross pressure at the base of the foundation at which the soil fails in shear is known as ultimate bearing capacity.
Gross safe bearing capacity (qₛ) is the maximum net intensity of loading that the soil can carry safe without failing in shear.

10. According to Indian soil classification, a soil sample is said to be sand when: [JSSC JE (GEN. ENGG.)- 03.11.2022 ]

Correct Answer: (c) More than half of the coarse fraction is smaller than 4.75 mm IS sieve
Solution:

According to Indian soil classification, a soil sample is said to be sand when more than half of the coarse fraction is smaller than 4.75 mm IS sieve. Soil classification based upon grain size–