# Highway Engineering Questions and Answers – Sub Surface Drainage

This set of Highway Engineering Multiple Choice Questions & Answers (MCQs) focuses on ” Sub Surface Drainage”.

1. In slab culverts RCC slab is placed over abudment of __________
a) Masonry
b) Pre stressed
c) Steel
d) Composite

Explanation: Generally the RCC slab is placed over abudment made of masonry only because other materials are costly.

2. The span of RCC slab is limited to __________
a) 1 m
b) 1.5 m
c) 2.0 m
d) 3.0 m

Explanation: The span of the RCC slab is usually limited to 3 m as it may have maintenance problems.

3. What is the minimum diameter used in pipe culverts?
a) 25 cm
b) 35 cm
c) 45 cm
d) 75 cm

Explanation: The minimum diameter of the pipe culverts used is 75 cm made of steel or RCC, usually RCC is only used as steel corrodes.

4. The GWT should be at a distance of _______ from ground level.
a) 0.5 m
b) 0.6 m
c) 1.2 m
d) 5.0 m

Explanation: The preferred distance from the ground level is 1.2m, however it is not a problem where ground water table is very low.

5. The total interruption to traffic in a year should not exceed __________
a) 45 days
b) 40 days
c) 30 days
d) 15 days

Explanation: The interruption should be kept as low as possible if unavoidable then we must provide it for 15 days.
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6. The clay seal may be provided if the seepage zone is at a depth of less than __________
a) 1.2 m
b) 1.0 m
c) 0.9 m
d) 0.6m to 0.9 m

Explanation: The clay seal may be construed if the seepage zone is at a depth of less than 0.6 m to 0.9 m.

7. The capillary control can be controlled by how many methods?
a) One
b) Two
c) Three
d) Four

Explanation: The capillary control can be controlled by two methods called granular capillary cut off and impermeable capillary cut off.

8. To fulfill the adequate permeability the D15 of filter/D15 of foundation ratio should be greater than __________
a) 5
b) 10
c) 15
d) 20

Explanation: For adequate permeability, the ratio of the D15 of filter/D15 of foundation should be greater than 5.

9. The D85 point size is given by __________
a) Dp
b) 2Dp
c) 3Dp
d) 4Dp

Explanation: The D85 point size of the filter is given by the value 2Dp.

10. The loss of water from leaves present on embankment is called __________
a) Evaporation
b) Transpiration
c) Sublimation
d) Boiling

Explanation: The vegetation is provided on the embankment as they can absorb the water during heavy rain, and the loss is termed as transpiration.

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