Index Properties MCQ with answer and solution

Concept

Relation between porosity and void ratio

Formula

e = n / (1 − n)

Step-by-step solution

1. e_A = 0.4/0.6 = 2/3. 2. e_B = 0.6/0.4 = 3/2. 3. e_A / e_B = (2/3) / (3/2) = 4/9.

Explanation

Void ratio and porosity are related by e = n/(1 − n). Substitute for both samples and take the ratio.

Shortcut

e = n/(1 − n): 40% → 0.667, 60% → 1.5.

Common mistake

Taking the ratio of porosities (2/3).