Steel and Timber Test - 2

1. When a part of the timber is affected by dry rot, the unaffected portion of the timber should be painted with a solution of _________

Lead acetate

Copper sulphate

Silver chloride

Aluminium nitrate

2. Batten is a piece of timber whose thickness and breadth do not exceed ________

30 mm

10 mm

100 mm

50 mm

3. Timber which is mostly used for engineering purposes belongs to endogenous trees.

True

False

4. Which of the following statements about plywood is not true?

Plywoods are available in large sizes

They are elastic

Expansion and shrinkage are very high

Plywoods are light in weight

5. Dry rot is a defect caused in timber in which wood is converted into dry powder form by fungi. Which of the following statements about dry rot is not correct?

If the storage of timber after its felling is not done properly, it is liable for the attack of dry rot

Unseasoned softwoods cannot be easily attacked by dry rot

It usually occurs at places where there is no free circulation of air

It is not essential to have damp conditions for the development of dry rot

6. Which of the following is not a variety of industrial timber?

Plywood

Baulk

Veneers

Fibreboard

7. Which of the following defects occur in the seasoning process of wood?

Sap stain

Bow

Brown rot

Blue stain

8. The maximum limit of weight of fibreboards is _________

1960 kg/m³

2460 kg/m³

960 kg/m³

2960 kg/m³

9. Which of the following is available under trade names such as Formica, Sunmica, Sungloss etc?

Impreg timber

Veneer

Compreg timber

Fibreboard

10. Chir and deodar are examples of hardwoods while oak and sal are examples of softwoods.

False

True