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41. The disease of dry rot in timber is caused by_____________?
A. lack of ventilation
B. alternate wet and dry conditions
C. complete submergence in water
D. none of the above
42. In which of the following directions, the strength of timber is maximum ?
A. parallel to grains
B. 45° to grains
C. perpendicular to grains
D. same in all directions
43. Which of the following represents a metamorphic rock? (1) slate (2) shale (3) quartzite . The correct answer is___________?
A. only (3)
B. both (1) and (3)
C. both (2) and (3)
D. all (1), (2) and (3)
44. Assertion A : Shishum is used for decorative woodwork. Reason R : Shishum can be polished to an excellent finish. Select your answer according to the coding system given below ?
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true
45. The moisture content in a well seasoned timber is_______________?
A. 4% to 6%
B. 10% to 12%
C. 15% to 20%
D. 100%
46. The radial splits which are wider on the outside of the log and narrower towards the pith are known as________________?
A. heart shakes
B. cupshakes
C. starshakes
D. rindgalls
47. Which of the following timbers is suitable for making sports goods ?
A. mulberry
B. mahogany
C. sal
D. deodar
48. Sapwood consists of______________?
A. innermost annular rings around the pith
B. portion of timber between heartwood and cambium layer
C. thin layers below the bark
D. thin fibre which extends from the pith outwards and holds the annular rings together
49. In which of the following pairs both trees yield soft wood ?
A. deodar and shishum
B. chir and sal
C. sal and teak
D. chir and deodar
50. Which of the following trees yields hard wood ?
A. deodar
B. chir
C. shishum
D. pine