1. Underground conduits can be classified into ___________ types.
a) 2
b) 4
c) 3
d) 5
Explanation: Based on the type of installations, conduits can be classified into 3 types:
i) Ditch conduits
ii) Projecting conduits
iii) Special conduits.
2. Ditch conduits are more commonly used in ___________
a) Sewers
b) High way
c) Railway culverts
d) All of the mentioned
Explanation: Since narrow ditch can be installed in a narrow ditch below ground level, it is more commonly used as sewers, water mains etc.
3. The problem of computing the stress in the vicinity of a cylindrical tunnel was solved by __________
a) Terzaghi
b) Mindlin
c) Biot
d) Rankine
Explanation: The problem of computing the stress in the vicinity of a cylindrical tunnel corresponding to the state of elastic equilibrium has been solved more rigorously by Mindlin (1939), using the values of K0.
4. The transfer of pressure from a yielding part of soil mass to the less yielding part is defined by the term __________
a) Arching
b) Projecting conduits
c) Stress transfer
d) None of the mentioned
Explanation: Arching is defined as the phenomenon of the transfer of pressure from a yielding part of the soil mass to an adjoining less yielding or restrained part of the mass
5. Which of the following conduit is installed in shallow bedding?
a) Ditch conduits
b) Positive projecting conduits
c) Special conduits
d) Negative projecting conduits
Explanation: A passive projecting conduit is the one which is installed in shallow bedding, with its top projecting above the natural ground and which is then covered with an embankment.
6. Which of the following values of K0 is used to compute the stress in the vicinity of a cylindrical tunnel?
a) K0 = 1
b) K0 = μ / 1-μ
c) K0 = 0
d) All of the mentioned
Explanation: The problem of computing the stress in the vicinity of a cylindrical tunnel corresponding to the state of elastic equilibrium has been solved by Mindlin using the following valued of K0:
i) K0 = 1 ii) K0 = μ / 1-μ iii) K0 = 0.
7. Terzaghi’s experiment show that the value of K (empirical constant) varies from about ________ above the Centre of strip.
a) Unity
b) Zero
c) Less than unity
d) None of the mentioned
Explanation: Terzaghi’s experiments show that the value of K varies from about unity (i.e., 1) immediately above the Centre of strip to a maximum of 1.5 at an approximate height above the strip.
8. Which of the following conduits are commonly used in highway or railway culverts?
a) Positive/Negative projecting conduits
b) Negative projecting conduits
c) Ditch conduits
d) All of the mentioned
Explanation: Negative and positive projective conduits are used in highway or railway culverts as both can be covered with an embankment.
9. Earth embankments or slopes are commonly required for which of the following purpose?
a) Railways
b) Earth dams
c) Road ways
d) All of the mentioned
Explanation: Earth embankments are commonly required for railways, roadways, earth dams, levees and river training works
10. The failure of slopes may take place due to ___________
a) Forces between the soil particle and High water content
b) Action of gravitational force
c) None of the mentioned
d) All of the mentioned
Explanation: The failure of slopes takes place mainly due to the action of a gravitational force which tends to pull the upper portions of the soil mass downwards to a nearly more level surface.