Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Polyvinyl rubber acquire no release agent at all. Reason (R): For this reason, this is one of the best mould material. In the light of the above statements, choose the most appropriate answer from the options given below:

• 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:

Logic Tip: Flexible rubber moulds are preferred because casts separate easily without much release agent.

Answer 1

The Correct Option is A

Concept:
Polyvinyl rubber and similar flexible rubber materials are widely used in mould making for sculpture, casting, ceramics, and industrial reproduction because of their flexibility and easy release properties.

Step 1:
A release agent is a material applied to mould surfaces to prevent sticking between:
• The mould
• The cast object Polyvinyl rubber naturally possesses:
• Flexibility
• Non-stick properties
• Easy separation capability Therefore, it often requires little or no release agent. Thus: \[ Assertion (A) is correct \]

Step 2:
Because polyvinyl rubber:
• Separates easily from casts
• Captures fine details
• Is flexible and reusable
• Reduces mould damage it is considered one of the best materials for mould making. Therefore: \[ Reason (R) is correct \]

Step 3:
The reason directly explains the assertion because:
• The absence of release-agent requirement contributes to its effectiveness as a mould material. Hence: \[ Reason correctly explains Assertion \]

Step 4:
Rubber mould materials are widely preferred because they:
• Capture intricate details
• Allow repeated casting
• Reduce breakage risk
• Simplify demoulding They are extensively used in sculpture and industrial casting processes.

Step 5:
Since both statements are correct and the Reason properly explains the Assertion, the correct answer is: \[ \boxed{\text{(1) Both (A) and (R) are correct and (R) is the correct explanation of (A)}} \]