Question:
The defect which develops due to uncontrolled and non-uniform loss of moisture from wood is known as
The defect which develops due to uncontrolled and non-uniform loss of moisture from wood is known as
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Common timber defects:
• Knot $\rightarrow$ Branch growth
• Shake $\rightarrow$ Internal crack
• Cross grain $\rightarrow$ Irregular fibre direction
• Warping $\rightarrow$ Unequal shrinkage during seasoning
• Knot $\rightarrow$ Branch growth
• Shake $\rightarrow$ Internal crack
• Cross grain $\rightarrow$ Irregular fibre direction
• Warping $\rightarrow$ Unequal shrinkage during seasoning
Updated On: Jul 23, 2026
- Knot
- Shake
- Warping
- Cross grain
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The Correct Option is C
Solution and Explanation
Concept:
Seasoning removes moisture from timber. If moisture is removed too rapidly or non-uniformly, unequal shrinkage occurs in different parts of the timber, causing distortion known as warping.
Warping changes the original shape of the timber, making it unsuitable for construction purposes.
Step 1: Understand the cause of warping. When different portions of wood lose moisture at different rates, \[ \text{Unequal Shrinkage} \Longrightarrow \text{Distortion of Timber}. \] This distortion is called warping.
Step 2: Differentiate it from other defects.
• Knot: Portion of a branch embedded in timber.
• Shake: Separation of fibres due to internal cracks.
• Cross grain: Fibres are not parallel to the longitudinal axis.
• Warping: Distortion caused by unequal drying. Hence, \[ \boxed{\text{The defect is Warping}.} \] Therefore, the correct option is \[ \boxed{(C)\;\text{Warping}.} \]
Step 1: Understand the cause of warping. When different portions of wood lose moisture at different rates, \[ \text{Unequal Shrinkage} \Longrightarrow \text{Distortion of Timber}. \] This distortion is called warping.
Step 2: Differentiate it from other defects.
• Knot: Portion of a branch embedded in timber.
• Shake: Separation of fibres due to internal cracks.
• Cross grain: Fibres are not parallel to the longitudinal axis.
• Warping: Distortion caused by unequal drying. Hence, \[ \boxed{\text{The defect is Warping}.} \] Therefore, the correct option is \[ \boxed{(C)\;\text{Warping}.} \]
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