1. Slopes is classified into ____________ types.
a) 2
b) 3
c) 4
d) 5
Explanation: Slopes may be of two types:
i) infinite slopes
ii) finite slopes.
2. Which of the following is an example of slopes extending to infinity?
a) Inclined face of Earth dams
b) Embankments
c) Cuts
d) None of the mentioned
Explanation: Slopes extending to infinity do not exist in nature.
3. Analysis of stability of slopes is used for determining ___________
a) Shearing strength and Stressed internal surface
b) Properties of the soil
c) None of the mentioned
d) All of the mentioned
Explanation: An analysis of stability of slopes consist of determining the most severely stressed internal surface and the magnitude of the shearing stress to which it is subjected and determining the shearing stress along the surface.
4. If the soil properties for all identical depths below the surface are constant, it is a _________
a) Finite slope
b) Infinite slope
c) Planar failure surface
d) All of the mentioned
Explanation: If a slope represents the boundary surface of a semi-infinite soil mass, and the soil properties for all identical depths below the surface are constant, it is called an infinite slope.
5. A long natural slope of cohesion-less soil is inclined at 12° to the horizontal. What will be the factor of safety of the slope if φ = 30°?
a) 1.6
b) 2.7
c) 0.13
d) 0.4
Explanation: Given φ = 30° and i = 12°
Formula, F = tan φ /tan i
F = tan 30° / tan 12°
F = 2.72.
6. Factor of safety with respect to height is given by ______________ equation.
a) FC = HC / H
b) FC = C / Cm
c) FC = τf / τ
d) FC = τC / τ
Explanation: Since the factor of safety FC with respect to cohesion, also represent the factor of safety with respect to height
FC = C / Cm = HC / H
Where, Cm is the mobilized cohesion at a depth H.
7. In the limiting case of stability, the angle of slope is referred to as _____________
a) Angle of deviation
b) Angle of repose
c) Angle of unstable slope
d) All of the mentioned
Explanation: In the limiting case of stability, the angle of slope is known as the angle of repose φ.
8. The factor of safety against safety is given by ________ equation.
a) F = HC / H
b) F = τf / τ and F = tan φ / tan i
c) None of the mentioned
d) All of the mentioned
Explanation: The factor of safety against sliding is given by equation:
F = τf /τ = tan φ / tan i.
9. A basic type of failure at a finite slope may occur due to ___________
a) Slope failure and Base failure
b) Toe failure
c) None of the mentioned
d) All of the mentioned
Explanation: The two basic types of failure of a finite slope may occur: (i) slope failure (ii) base failure.
10. If the failure occurs along a surface of sliding that intersect the slope at its toe, the slide is known as ___________
a) Base failure
b) Slope failure
c) Face failure
d) All of the mentioned
Explanation: If the failure occurs along a sliding that intersects the slopes at or above its toe, the slide is known as slope failure.