CIVIL ENGINEERING QUIZ-BMC(timber)

CIVIL ENGINEERING QUIZ-BMC(timber)

1. Equilibrium moisture content for most of the tropical timbers varies between

A) 1-5%
B) 5-10%
C) 10-20%
D) 20-30%

... Answer is C)
10-20% "

2. 1 in 12 slope of grains in timber beam results in reduction of strength by about

A) 10%
B) 20%
C) 30%
D) 40%

... Answer is C)
30% "

3. The best time for felling a tree is mid-summer or mid winter because

A) cheap labour is available in the period
B) sap is at rest
C) timber become hard
D) timber become soft

... Answer is B)
sap is at rest"

4. Plywood has great stiffness and strength

A) Across the grains
B) Along the grains
C) Both (A) and (B) above
D) None of the above

... Answer is C)
Both (A) and (B) above "

5. Ratio of the modulus of elasticity of wood in a direction perpendicular to the grain to the value in a direction parallel to the grain falls in the range

A) 1/20 to 1/12
B) 1/3 to 1/2
C) 2 to 3
D) 5 to 10

... Answer is A)
1/20 to 1/12"

6. As a construction material, plywood is preferred to thin planks of timber because of

A) good strength and dimensional stability in both lateral and longitudinal directions
B) good dimensional stability in both lateral and longitudinal directions
C) good strength in both lateral and longitudinal directions
D) saving in cost and environmental considerations

... Answer is A)
good strength and dimensional stability in both lateral and longitudinal directions"

7. which of the following in timber is caused by fungus?

A) Upsets
B) Foxiness
C) Dry rot
D) Shakes

... Answer is C)
Dry rot"

8. The wood preservative "creosote" is derive from

A) Wood or coal
B) Acidic cupric chromate
C) chromate zinc chloride
D) Pentachlorophenol

... Answer is A)
Wood or coal"

9. The seasoning of timber is done by

A) drying
B) Moist drying
C) clearing dry rot
D) hot drying

... Answer is B)
Moist drying"

10. The portion of timber between heart wood and cambium layer is called

A) sap wood
B) wane wood
C) hot wood
D) none of these

... Answer is A)
sap wood"

11. The moisture content achieved after oven drying of timber is

A) 5%
B) 10%
C) 15%
D) 20%

... Answer is C)
15% "

12. Defect in the growth of timber is/are called

A) Shakes
B) Checks
C) Both (A) & (B)
D) None of these

... Answer is A)
Shakes"

13. The radial splits which are wider on the outside of the log and narrower towards the pith are known as

A) Heart shakes
B) Star shakes
C) Cup shakes
D) none of these

... Answer is B)
Star shakes"

14. The disintegration of tissues of wood caused by fungi is called

A) Rot
B) Knot
C) checks
D) mould

... Answer is A)
Rot"

15. The defect in wood due to conversion is

A) Burls
B) Shakes
C) Chp mark
D) None of these

... Answer is C)
Chp mark"

16. Defect caused by shrinkage in timber is

A) Cup and bow
B) crook
C) twist
D) all of these

... Answer is D)
all of these"

17. The trees yielding hard wood is

A) Shisham
B) Chir
C) Deodar
D) pine

... Answer is A)
Shisham "

18. The sports goods are made from

A) Sal
B) Deodar
C) chir
D) Mulberry

... Answer is D)
Mulberry "

19. Plywood is obtained from

A) Teak wood
B) Structure wood
C) Bamboo
D) Commonly available wood

... Answer is A)
Teak wood"

20. The plywood has

A) A good strength along the panel only
B) Greater impact resistance
C) Tendency to split in the panel
D) Tendency to bend easily

... Answer is B)
Greater impact resistance "