UPSC Civil Service Exam Questions - Engineering

Q1:

Consider the following statements
The main reinforcement in the counterfort in a counterfort retaining wall of R.C.C is provided on the :
1. inclined face in front of counterfort.
2. bottom face in. back counterfort.
3. inclined face in back counterfort.
4. bottom face in front counterfort.
Select the correct answer using the codes given below :

A 1 and 2

B 2 and 3

C 3 and 4

D 2 and 4

ANS:C - 3 and 4

What is front and back counterfort? Can anyone explain?