Question:
Which one of the following is not non refractory woods?
Which one of the following is not non refractory woods?
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Double negatives are common in ICAR exams.
Non-refractory = Easy drying.
Refractory = Difficult drying.
Shorea robusta (Sal) is the classic example of a "tough" wood in all Indian forestry contexts.
Non-refractory = Easy drying.
Refractory = Difficult drying.
Shorea robusta (Sal) is the classic example of a "tough" wood in all Indian forestry contexts.
Updated On: Aug 7, 2026
- Bombax ceiba
- Boswellia serrata
- Trewia nudiflora
- Shorea robusta
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of wood seasoning (drying). It uses a double negative: "not non-refractory." This means the question is asking for a refractory wood.
Key Formula or Approach:
Refractoriness in wood is the resistance it offers to the removal of moisture during the seasoning process. Wood species are classified into three classes:
1. Class A (Non-refractory): Dries easily without defects (e.g., Semul).
2. Class B (Moderately refractory): Dries with some difficulty (e.g., Teak).
3. Class C (Highly refractory): Hard to dry, prone to splitting and warping (e.g., Sal).
Step 2: Detailed Explanation:
• Bombax ceiba (Semul) and Trewia nudiflora (Gutgutia) are softwoods that are very easy to season and are classified as non-refractory.
• Boswellia serrata (Salai) is generally considered easy to moderately easy to season.
• Shorea robusta (Sal) is a very heavy, hard, and durable wood. It is notorious for being "Highly Refractory." It must be seasoned very slowly under controlled conditions to prevent severe cracking and honeycombing.
• Since "not non-refractory" equals "refractory," Shorea robusta is the only correct fit.
Step 3: Final Answer:
Shorea robusta is a highly refractory wood, making it "not non-refractory."
This question tests knowledge of wood seasoning (drying). It uses a double negative: "not non-refractory." This means the question is asking for a refractory wood.
Key Formula or Approach:
Refractoriness in wood is the resistance it offers to the removal of moisture during the seasoning process. Wood species are classified into three classes:
1. Class A (Non-refractory): Dries easily without defects (e.g., Semul).
2. Class B (Moderately refractory): Dries with some difficulty (e.g., Teak).
3. Class C (Highly refractory): Hard to dry, prone to splitting and warping (e.g., Sal).
Step 2: Detailed Explanation:
• Bombax ceiba (Semul) and Trewia nudiflora (Gutgutia) are softwoods that are very easy to season and are classified as non-refractory.
• Boswellia serrata (Salai) is generally considered easy to moderately easy to season.
• Shorea robusta (Sal) is a very heavy, hard, and durable wood. It is notorious for being "Highly Refractory." It must be seasoned very slowly under controlled conditions to prevent severe cracking and honeycombing.
• Since "not non-refractory" equals "refractory," Shorea robusta is the only correct fit.
Step 3: Final Answer:
Shorea robusta is a highly refractory wood, making it "not non-refractory."
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