Question

Assertion A: Darcy's Law is used in studying groundwater flow in alluvial formations.
Reason R: The specific yield of clay soil is 15-30%, whereas, it is 1-10% for gravel.
In light of the above statements, choose the correct answer from the options given below:

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is NOT the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Hint:

Darcy's Law: Q = KIA.
Specific yield:
Clay: 1-10%.
Gravel: 15-30%.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Darcy's Law describes groundwater flow.
Specific yield is a property of soil.

Step 2: Key Formula or Approach:
No specific formula.
Need to know Darcy's Law and specific yield values.

Step 3: Detailed Explanation:
Darcy's Law is indeed used in studying groundwater flow in alluvial formations.
This is correct.
However, the specific yield values given are incorrect.
Specific yield of clay soil is typically 1-10%, while for gravel it is 15-30%.
The values are reversed in the statement.
Thus, R is false.

Step 4: Final Answer:
A is true but R is false.
Hence, the correct option is (C).