MCQs from JDO Exam

1. Which layer of the road structure directly interacts with traffic?
   a) Subsoil
   b) Sub-grade
   c) Base course
   d) Wearing course
   
   Answer: d) Wearing course
2. The primary function of the base course is to:
   a) Provide a smooth riding surface
   b) Protect the sub-grade from traffic stress
   c) Transmit load from the surface to the sub-grade
   d) Prevent capillary action of water
   
   Answer: c) Transmit load from the surface to the sub-grade
3. The recommended width of a two-lane carriageway without raised kerbs is:
   a) 5.5m
   b) 7.0m
   c) 7.5m
   d) 3.75m
   
   Answer: b) 7.0m
4. Match List I (Components of Road Structure) with List II (Functions):
   List I
   A. Subsoil
   B. Sub-grade
   C. Base Course
   D. Wearing Course
   
   List II
   1. Provides a smooth and watertight riding surface
   2. Transmits load from surface to sub-grade
   3. Supports the foundation and road surface
   4. Natural soil on which the road is built
   
   Codes:
   a) A-4, B-3, C-2, D-1
   b) A-3, B-4, C-1, D-2
   c) A-1, B-2, C-3, D-4
   d) A-2, B-1, C-4, D-3
   
   
   Answer: a) A-4, B-3, C-2, D-1