Question

The maximum ruling gradient in a rolling terrain according to IRC can be

• A. 1 in 15
• B. 1 in 60
• C. 1 in 90
• D. 1 in 30

Hint:

IRC ruling gradients: \[ \boxed{ \begin{aligned} \text{Plain/Rolling} &\rightarrow 1:30\\ \text{Mountainous} &\rightarrow 1:20\\ \text{Steep} &\rightarrow 1:16.7 \end{aligned} } \]

Answer 1

The Correct Option is D

Step 1: Recall the IRC recommendations for ruling gradients. According to IRC guidelines: - Plain terrain : \(1 \text{ in } 30\) - Rolling terrain : \(1 \text{ in } 30\) - Mountainous terrain : \(1 \text{ in } 20\) - Steep terrain : \(1 \text{ in } 16.7\)

Step 2: Choose the correct ruling gradient. Thus, for rolling terrain, \[ \boxed{1 \text{ in } 30} \] is the maximum ruling gradient. Hence, \[ \boxed{(D)} \] is the correct answer.