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Question
What is the grade of timber as per timber grading (IS 6543), if modulus of elasticity in bending is between 5.6 to 9.8 kN/mm2?
ydM+h dh xzsfMax (IS 6543) ds vuqlkj] ;fn cadu esa izR;kLFkrk ekikad 5.6 ls 9.8 kN/mm2 ds chp jgrk gS] rks ydM+h dks fuEufyf[kr Jsf.k;ksa esa ls fdl Js.kh esa oxhZÑr fd;k tkrk gS\
A.
Grade B
B.
Grade A
C.
Grade C
D.
Grade D
Answer ( Option C)

Grade C

Solution

Modulus of Elasticity 
Group A - Modulus of elasticity in bending above 12.5 kN/mm2 
Group B - Modulus of elasticity in bending above 9.8 kN/mm2 and below 12.5 kN/mm2 
Group C - Modulus of elasticity in bending above 5.6 kN/mm2 and below 9.8 kN/mm2

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