1.Timber should be light weight.
a) True
b) False
Explanation: Heavy and dense timber is the one used for all purposes. Light weight wood results in weak, unsound structure.
2. Which of the below is true about good timber?
a) Elastic
b) Round fibres
c) Less cost
d) Less density
Explanation: Timber should be elastic i.e., it should retain shape when load causing deformation is removed. A good timber should have straight, compact fibres, moderate cost and high density.
3. The water permeability of timber is greater:
a) Along centre
b) Along Fibres
c) Along annual rings
d) Along bark
Explanation: Water permeability of timber should essentially be zero. If it absorbs water, it is prone to decay. Fibres are most porous.
4.The felling of the tree is usually carried out in:
a) Winter
b) Summer
c) Rainy season
d) Spring
Explanation: In winter season, the productivity of tree decreases due to lack of sun light. The sap and moisture content is less. During the summer, there is 50% more sap content.
5. In large forests, trees are felled using:
a) Hammer and chisel
b) Chainsaw
c) Tractor
d) Axe
Explanation: Large forest contains a huge number of trees. It will be difficult, time consuming to cut them using chisel, axe or chainsaw. So specially designed tractor with cutters and grabbers are used to fell trees.
6.The thickness of veneers varies from:
a) 0.4-0.6 cm
b) 0.1-0.4 cm
c) 0.1-0.4 mm
d) 0.4-0.6 mm
Explanation: Veneers are thin sheets of wood. They are obtained by rotating timber against a sharp knife. These form starting point of the manufacturing process of plywood.
7. Which of the following is not a material that forms Particle Board?
a) Shavings
b) Fibres
c) Ribbons
d) Flakes
Explanation: Fibre board is made of fibres of wood. Chips, flakes, ribbons and shavings are different sized particles of wood, used in the manufacturing of Particle Board.
8. Debarking is done so as to:
a) Safeguard saws
b) Improve seasoning
c) Expose surface of wood
d) Reduce weight
Explanation: Debarking is now being adopted widely. It safeguards saws and equipment from damage that would otherwise result from stones, metals, etc. present in the bark.
9. Breaking down is the process of:
a) Felling a tree
b) Conversion of logs
c) Defect in timber
d) Reducing weight
Explanation: The logs are cut into the board using circular saws and band saws. This is called conversion, and first stage of conversion is the process called breaking down. It means rough sawing.
10. How many types of rough sawing are there?
a) 4
b) 5
c) 2
d) 3
Explanation: The 2 types of rough sawing are through and through sawn and quarter sawn.