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The strength of timber is maximum
  • a)
    Parallel to the grain
  • b)
    Perpendicular to the grain
  • c)
    45° to the grain
  • d)
    Same in all direction
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
The strength of timber is maximuma)Parallel to the grainb)Perpendicula...
Different type of strength of timber:
Compressive strength:
  • The compressive strength is found to be the highest when acting parallel to the axis of growth.
  • The compressive strength perpendicular to the fibers of wood is much lower than that parallel to fibers of the wood. 
Tensile strength:​
  • Tensile strength along a direction parallel to the grains is found to have the greatest strength that can be developed under any kind of stress.
  • Tensile strength parallel to fibers is of the order 80.0 to 190.0 N/cm2.
Shearing strength:
  • Resistance to shear in across direction is found 3 to 4 times greater than that along fibers.
  • The shear strength along the fiber is found of the order 6.5 to 14.5 N/mm2. 
Explanation:
The strength of timber is the highest parallel to the grains and minimum perpendicular to grains.
Additional Information
Timber: 
The wood that is going to use for the building. The structure of the wood is:

Pith:
  • The innermost central portion or core of the tree is called the pith or medulla.
  • As the plant becomes old, the pith dies up and decays.
Sap Wood:
  • Outer annual rings between the heartwood and cambium layer are the sapwood.
  • It is light in color and weight.
  • It takes an active part in the growth of the trees.
  • It does not impart any strength.
Cambium Layer:
  • A thin layer of sap in between the sapwood and inner bark is referred to as the cambium layer.
  • It indicates the portion of the sap which is yet to be converted into the sapwood.
Bark:
The Outer protective layer or covering provided around the cambium layer is referred as bark.
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Community Answer
The strength of timber is maximuma)Parallel to the grainb)Perpendicula...
C) 45 degrees
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The strength of timber is maximuma)Parallel to the grainb)Perpendicular to the grainc)45° to the graind)Same in all directionCorrect answer is option 'A'. Can you explain this answer?
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