551. A well seasoned timber may contain moisture up to
A. 4 to 6%
B. 6 to 8%
C. 8 to 10%
D. 10 to 12%.

552. The curved swellings from the growth of layers or wounds left after branches are cut off in an irregular manner, are known as
A. knots
B. rindgalls
C. burls
D. none of these.

553. For the manufacture of plywood, veneers are placed so that grains of adjacent veneers
A. run at right angles
B. parallel
C. inclined at 45?
D. inclined at 60?.

554. The most valuable timber may be obtained from
A. chir
B. shisham
C. sal
D. teak.

555. The timber having maximum resistance against white ants, is obtained from
A. chir
B. shisham
C. sal
D. teak.

556. Due to attack of dry rot, the timber
A. cracks
B. shrinks
C. reduces to powder
D. none of these.

557. Teak wood is suitable for
A. sports articles
B. furnitures
C. railway sleepers
D. all the above.

558. Veneering means
A. carving out designs on timber planks
B. chemically treating timber planks
C. thick layer of superior wood glued to inferior wood
D. thin layer of superior wood glued to inferior wood.

559. According to IS 399-1963, the weight of the timber is specified at
A. 8% moisture content
B. 10% moisture content
C. 12% moisture content
D. 14% moisture content.

560. Knots in timber are
A. defects caused by crushing fibres
B. splits radiating from the centre
C. speckled strains
D. signs of branches cut off.

NOTE
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