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Question
Wood can be classified into X, Y, Z grades on the basis of
A.
Seasonal characteristics
B.
Durability
C.
Availability
D.
Elasticity
Answer ( Option C)

Availability

Solution

The classification of timber as per IS: 399 is as follows:
 

Classification of Timber on the basis of

Types

Its Position

Standing

Rough

Converted or Lumber

Grading

Structural

Commercial

• Grade A

• Grade B

• Grade C

• Grade D

Modulus of Elasticity

• Grade A

• Grade B

• Grade C

Availability

X

Y

Z

Durability

High Durability

Moderate Durability

Low Durability

Seasoning Characteristics

Class A

Class B

Class C

Treatability

Easily Treatable

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