1. Plywood is identified by
a ) volume
b ) weight
c ) thickness
d ) area
2. Plywood is obtained by gluing wooden sheets at a specification of
a ) 100 to 150 N / cm²
b ) both ( a ) and ( b ) of above
c) 100 degree to 130 degree celcius
d) none of above
3. Plywood is generally available
a ) 1 mm thick
b ) 2 mm thick
c) 3 to 4 mm thick
4. Which of the following is not hardwood?
a ) deodar
b ) sal
c ) teak
d ) oak
5. Which of the following is not a soft wood ?
a ) deodar
b ) walnut
c ) shisham
d ) kail
6. When the timber is attacked by fungus and reduced to powder , it is called
a ) wet rot
b ) dry rot
c ) druxiness
d ) dottiness
7. Based on its dry weight , a freshly felled free may contain water
a ) 25 %
b ) 50 %
c ) 75 %
d ) 100 %
8. The time require for the seasoning of timber in air is about water
a ) 1 to 2 months
b ) 2 to 4 months
c ) 4 to 6 months
d ) 6 to 9 months
9. In the manufacture of plywoods the veneers are placed such that the grains of one layer are
a ) at 45 ° with the grains of the other
b ) at right angles with the grains of the other
c ) at 60 ° with the grains of the other
d ) parallel to the grains of the other
10. In dry rot , wooden material defect caused due to
a ) ant
b ) fungus
c ) weather
d ) none of the above
11. Which of the following wood has the maximum resistance to white ants ?
a ) deodar
b ) sal
c ) walnut
d ) teak
12. Creosote oil is used to preserve the wood from ,
a ) rot and white ant
b ) fire hazards
c ) cracking
d ) none of the above
1313. Knots in timber are
a ) defects caused by crushing fibers
b ) splits radiating from the centre
c ) speckled strains
d ) signs of branches cut off
14. The defect caused by the shrinkage of timber is
a ) crook
b ) cup and bow
c ) twist
d ) none of the above
15. Impregnating of timber is done to increase
a ) fire resistance of timber
b ) seasoning of timber
c ) weight of timber
d ) none of the above
16. Timber can be made reasonably fire resistant
a ) by soaking it in ammonium sulphate
b ) by applying tar paint
c ) by pumping creosote oil into timber under high pressure
d ) none of the above
17. The main purpose of seasoning is
a ) to make the timber fire resistant
b ) to remove the moisture from the timber at uniform rate
c ) to make the timber water proof
d ) none of the above
18. Which one is false ?
a ) seasoning is done to control moisture
b ) sal wood is used for ornamental purpose
c ) sap is suck in spring by roots of the tree
d ) all of the above
19. The seasoning of timber
a ) makes the timber light , strong and stable
b ) prevents warping , cracking and shrinkage in timber
c ) makes timber resistant to decay by fungi , termites etc. and also resistant to electricity
d ) all of the above
20. The number of veneers glued under pressure in a plywood must be
a ) prime number
c ) even number
d ) odd number
21. The curved swellings from the growth of layers or wounds left after branches are cut off in an irregular manners , are known as
a ) knots
b ) composite number
c ) burls
d ) none of the above
22. The defects in wood due to hardening is
a ) knots
b ) rind galls
c ) burls
d ) all of the above
23. Which of the following statements is not correct ?
a ) kiln seasoned timber is stronger than natural seasoned timber
b ) moisture content in the timber can be reduced to any desired level in kiln seasoning
c ) kiln seasoning is quicker than natural seasoning
d ) kiln seasoning requires less stacking space but more expensive than the natural seasoning
24. In a well – seasoned timber , the moisture content will be in the range of
a ) 20-25 %
c ) 10-12 %
b ) 15-20 %
d ) 5-7 %
25. Most economical methods of sawing wood is
a ) radial sawing
c ) quarter sawing
b ) tangential sawing
d ) flat sawing
26. A thin sheet of wood sliced from a log of wood is called
a ) plywood
b ) laminated board
c ) veneer
d ) none of the above
