Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): During Aquatic therapy an individual experiences greater resistance at higher speed movement and lesser resistance at slower speed movement.
Reason (R): The resistive force of surface tension changes proportionally to the size of the object moving through the fluid surface.
In the light of the above statements, choose the most appropriate answer.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Water resistance ∝ Velocity² Surface tension is negligible in movement resistance

Answer 1

The Correct Option is C

Concept:
Aquatic therapy relies on fluid mechanics principles such as:
• Drag force
• Buoyancy
• Viscosity

Step 1: Understanding Assertion (A).
Resistance in water (drag force) depends on:
• Velocity of movement Mathematically: \[ \text{Drag} \propto v^2 \] Thus:
• Faster movement → more resistance
• Slower movement → less resistance Hence, Assertion (A) is correct.

Step 2: Understanding Reason (R).
Surface tension:
• Acts at fluid surface
• Depends on surface area and intermolecular forces However:
• It is not the main factor affecting resistance during aquatic movement

Step 3: Identifying error in Reason.
The primary resistance in water movement is due to:
• Drag force (not surface tension)

Step 4: Conclusion.
\[ \boxed{\text{Assertion is correct but Reason is incorrect}} \]