Question

Consider the statements P and Q P: Soil particles formed by mechanical weathering, and close to their origin are generally subrounded. Q: Activity of the clay physically signifies its swell potential. Which one of the following options is CORRECT?

• A. Both P and Q are TRUE
• B. P is TRUE and Q is FALSE
• C. Both P and Q are FALSE
• D. P is FALSE and Q is TRUE

Hint:

Soil particle shape is influenced by transport distance; close to their origin, they tend to be angular. Clay activity is a reliable indicator of swelling potential.

Answer 1

The Correct Option is D

Step 1: Evaluating statement P: Soil particles formed by mechanical weathering near their source are typically angular rather than subrounded. As soil particles are transported over longer distances, they tend to become subrounded due to abrasion. Therefore, statement P is false. Step 2: Evaluating statement Q: The activity of clay is defined as the ratio of plasticity index to the percentage of clay particles. It provides an indication of the swelling potential of the soil. A high activity value suggests that the soil has a high swell potential. Thus, statement Q is true. Conclusion: Since statement P is false and statement Q is true, the correct answer is option (D).