Test: Properties Of Soil - 3 | 20 Questions MCQ Test

QUESTION: 1

Liquid limit of a soil indicates its

A.
Compressibility
B.
Permeability
C.
Optimum moisture content.
D.
Shear strength

Solution:

QUESTION: 2

An undisturbed soil sample has a plastic limit of 25%, a natural moisture content of 40% and liquidity index of 50%, Its liquid limit in % will be

A.
50
B.
55
C.
60
D.
75

Solution:

⇒ I_p = 30%
Also Ip = w_l - wp
⇒ W_l = 30 + 25 = 55%

QUESTION: 3

A well graded soil has a coefficient of curvature between

A.
10 to 12
B.
7 to 9
C.
4 tO 6
D.
1 to 3

Solution:

QUESTION: 4

The ratio of the undisturbed shear strength to the remoulded shear strength in cohesive soil under undrained conditions is

A.
Zero
B.
1
C.
Greater than 1
D.
Between 0 and 1

Solution:

at unaltered water condition i.e. at undrained condition. Remoulded shear strength is less than undisturbed shear strength.

QUESTION: 5

Number of phases in soil mass is:

A.
3
B.
2
C.
1
D.
4

Solution:

Soil has three phase representation as follows,

QUESTION: 6

Which of the following is a measure of particle size range?

A.
Effective size
B.
Uniformity coefficient
C.
Coefficient of curvature
D.
None of these

Solution:

The uniformity of a soil is expressed qualitatively by a term known as uniformity coefficient, C_u, given by,

The larger the numerical value of C_u, the more is the range of particles.

QUESTION: 7

The ratio for a soil mass is called:

A.
Liquidity index
B.
Shrinkage ratio
C.
Consistency index
D.
Toughness index

Solution:

The consistency index indicates the consistency (firmness) of a soil. It shows the nearness of the water content of the soil to its plastic limit. A soil with a consistency index of zero is at the liquid limit. It is extremely soft and has negligible shear strength. On the other hand, a soil at a water content equal to the plastic limit has a consistency index of 100%, indicating that the soil is relatively firm.

QUESTION: 8

The principle involved in the relation
γ_sub. = γ_sat - γ_w is

A.
Stoke’s law
B.
Darcy’s law
C.
Archimede’s principle
D.
Poiseuille’s law

Solution:

When the soil exists below Water, it is in a submerged condition. When a volume V of soil is sub merged in water, then according to Archimede’s principle it displaces an equal volume of water. Thus the net mass of soil when submerged is reduced.

QUESTION: 9

The uniformity coefficient of soil is given as

A.
D₁₀/D₆₀
B.
D₆₀/D₁₀
C.
D₃₀/D₆₀
D.
D₆₀/D₈₅

Solution:

Uniformity of a soil is expressed qualitatively by uniformity coefficient. The larger the numerical value of C_u more is the ranges of particles.

QUESTION: 10

Given for a soil sample:
Degree of saturation = 90%
Specific gravity of soil grains = 270
Void ratio = 0.30
The water content of the sample is

A.
10%
B.
13.5%
C.
22,5%
D.
35%

Solution:

QUESTION: 11

For distinguishing clays from silts in the field, a moist soil is rolled into a thread of 3 mm diameter. This test will indicate the

A.
Dilatancy
B.
Dry strength
C.
Wet and manipulated strength
D.
Toughness

Solution:

The test described is called 'rolling test' or ‘toughness test’ and indicates the toughness.

QUESTION: 12

Which one of the following is the water content of the mixed soil made from 1 kg of soil (say A) with water content of 100% and 1 kg of soil (say B) with water content of 50%?

A.
66%
B.
71%
C.
75%
D.
82%

Solution:

Water content,

Total weight,

Weight of solids in soil A,

Weight of solids in soil B

In mixed soil,
W_w = 500 + 333.3 = 833.3 gm
W_s = 500 + 666.7 = 1166.7 gm

QUESTION: 13

Which one of the following gives the correct decreasing order of the densities of a soil sample?

A.
Saturated, submerged, wet, dry
B.
Saturated, wet, submerged, dry
C.
Saturated, wet, dry, submerged
D.
Wet, saturated, submerged, dry

Solution:

We know that

For dry soil, w = 0;
For saturated soil, w = w_s
and for Wet soil 0 < w < w_s
Thus, dry density < wet density < saturated density.
Now

and

Thus submerged density < dry density

QUESTION: 14

Match List-I (Property of soil) with List-ll (Laboratory equipment) and select the correct answer using the codes given below
List-I
A. Grain size
B. Specific gravity
C. Coefficient of permeability
D. Cohesion

List-ll
1. Pycnometer
2. Permeameter
3. Vane shear apparatus
4. Pipette
Codes:

A.
A
B.
B
C.
C
D.
D

Solution:

QUESTION: 15

For a given soil sample,
If C_c = 1.0 and C_u = 4.0, then the value of D₃₀/D₁₀would be

A.
2.00
B.
175
C.
1.50
D.
1.25

Solution:

and

⇒ D₃₀/D₁₀ = 2

QUESTION: 16

At liquid limit, all soils possess

A.
Same shear strength of small magnitude
B.
Same shear strength of large magnitude
C.
Different shear strengths of small magnitude
D.
Different shear strengths of large magnitude

Solution:

QUESTION: 17

Which of the following methods is most accurate for the determination of the water content of soil?

A.
Oven drying method
B.
Sand bath method
C.
Calcium carbide method
D.
Pycnometer method

Solution:

QUESTION: 18

A pycnometer is used to determine

A.
Water content and voids ratio
B.
Specific gravity and dry density
C.
Water content and specific gravity
D.
Voids ratio and dry density

Solution:

QUESTION: 19

In hydrometer analysis for a soil mass

A.
Both meniscus correction and dispersing agent correction are additive
B.
Both meniscus correction and dispersing agent correction are subtractive
C.
Meniscus correction is additive and dispersing agent correction is subtractive
D.
Meniscus correction is subtractive and dispersing agent correction is additive