Building Materials - Practice Test

[#291] Quick lime (or caustic lime)

(A) Is obtained by the calcination of pure lime stone

(B) Has great affinity to moisture

(C) Is amorphous

(D) All the above

Correct Answer

(D) All the above

[#292] The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to

(A) Grey cast iron

(B) White cast iron

(C) Mottled cast iron

(D) Toughed cast iron

Correct Answer

(C) Mottled cast iron

[#293] The tendency of a stone is, to split along:

(A) Texture

(B) Fracture

(C) Cleavage

(D) Structure

Correct Answer

(C) Cleavage

[#294] Gypsum consists of

(A) H 2 S and CO 2

(B) CaSO 4 and H 2 O

(C) Lime and H 2 O

(D) CO 2 and calcium

Correct Answer

(B) CaSO 4 and H 2 O

Explanation

Solution: Gypsum is a mineral that is composed of: Calcium sulfate dihydrate (CaSO₄ · 2H₂O) This means gypsum consists of: Calcium sulfate (CaSO₄), which is the primary component. Water (H₂O), which is combined with calcium sulfate to form gypsum. Gypsum is widely used in construction and building materials, particularly for plaster and drywall.

[#295] 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°

Correct Answer

(A) Run at right angles

Building Materials - Study Mode

[#291] Quick lime (or caustic lime)

Correct Answer

[#292] The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to

Correct Answer

[#293] The tendency of a stone is, to split along:

Correct Answer

[#294] Gypsum consists of

Correct Answer

Explanation

[#295] For the manufacture of plywood, veneers are placed so that grains of adjacent veneers

Correct Answer