The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:

Gypsum consists of

A. H₂S and CO₂

B. CaSO₄ and H₂O

C. Lime and H₂O

D. CO₂ and calcium

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°

The most important constituent of an oil paint, is

A. Thinner

B. Vehicle

C. Pigment

D. All the above

Stucco paints are suitable for

A. Stone masonry

B. Brick walls

C. Both (A) and (B)

D. Neither (A) nor (B)