# Highway Engineering Questions and Answers – Surface Drainage System for Roads

This set of Highway Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Surface Drainage System for Roads”.

1. How many components are present in the surface drainage system?
a) One
b) Two
c) Three
d) Four

Explanation: The surface drainage system consists of three components they are camber, side drains and cross drains.

2. If the canal and drain at same level then the cross drainage structure is called __________
a) Aqueduct
b) Siphon aqueduct
c) Level crossing
d) Aquiclude

Explanation: If the canal and the drainage both are at the same level then the drainage structure is called level crossing.

3. What is the value of camber on earth roads?
a) 4%
b) 3%
c) 2%
d) 1.7%

Explanation: The value of the camber is recommended as 1.7% for the earth roads, for paved it may be up to 4%.

4. Which is the most preferred shape of drainage?
a) Rectangular
b) Trapezoidal
c) Triangular
d) Circular

Explanation: The trapezoidal shape is the most preferred shape of the drainage because of it’s simplicity and ease.

5. The longitudinal drain may be provided if the cross slope is more than __________
a) 1.0%
b) 2.0%
c) 3.0%
d) 4.0%

Explanation: The longitudinal drain should be provided only if the cross slope exceeds 4.0%, if it doesn’t exceed then it may not be necessary.
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6. The rural roads are provided with __________
a) RCC drains
b) Trapezoidal drains
c) Kutcha drains
d) No drainage

Explanation: The rural roads are mostly provided with the Kutcha drains, because of less population they are given the least importance.

7. Which type of drainage most advisable in cutting?
a) Longitudinal drainage
b) Side drains
c) Deep drainage
d) No drainage

Explanation: The most advisable type of the drainage in the cutting is open deep drainage because it is the most convenient type in cutting, remaining types can also be used if there is no alternative.

8. The water may be collected in __________
a) Catch pits
b) Longitudinal drains
c) Kerb
d) Filter sand

Explanation: The water from the rainfall is collected in a typical type of catch pit, and then it is forwarded to the drains.

9. If the span exceeds 6m then the bridge is called __________
a) Culvert
b) Minor bridge
c) Major bridge
d) Truss

Explanation: If the span is less than 6m it is called as a culvert, and if it is between 6 to 15m it’s a minor bridge, and if total span is 60m it’s a major bridge.

10. The relationship between specific yield specific retention and porosity is __________
a) Specific yield+specific retention= porosity
b) Specific yield-specific retention= porosity
c) Specific yield/specific retention=porosity
d) Specific yield*specific retention=porosity

Explanation: Porosity is the sum of specific yield and specific retention, specific yield is the ratio of volume of draw down to volume of water stored, and specific retention is the amount of water retained.

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