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31. Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is_________________?
A. 0°
B. 30°
C. 45°
D. 90°
32. The trunk of tree left after cutting all the branches is known as_______________?
A. log
B. batten
C. plank
D. baulk
33. The practical limit of moisture content achieved in air drying of timber is________________?
A. 5%
B. 15%
C. 25%
D. 35%
34. Crushing strength of a first class brick should not be less than_____________?
35. A first class brick when immersed in cold water for 24 hours should not absorb water more than______________?
A. 15%
B. 20%
C. 22%
D. 25%
A. 3.5 N/mm2
B. 7.0 N/mm2
C. 10.5 N/mm2
D. 14.0 N/mm2
36. The age of a tree can be known by examining_________________?
A. cambium layer
B. annular rings
C. medullary rays
D. heart wood
37. Plywood has the advantage of_____________?
A. greater tensile strength in longer direction
B. greater tensile strength in shorter direction
C. same tensile strength in all directions
D. none of the above
38. The plywood______________?
A. has good strength along the panel only
B. can be spilt in the plane of the panel
C. has greater impact resistance to blows than ordinary wood
D. cannot be bent more easily than ordinary wood of same thickness
39. First class timber has an average life of_____________?
A. less than one year
B. 1 to 5 years
C. 5 to 10 years
D. more than 10 years
40. The main function of alumina in brick earth is_______________?
A. to impart plasticity
B. to make the brick durable
C. to prevent shrinkage
D. to make the brick impermeable