Building Materials - Practice Test

[#56] Slacking of lime is affected by

(A) Keeping it exposed to air

(B) Immersing the lime in water

(C) Crushing the lime lumps

(D) None of these

Correct Answer

(B) Immersing the lime in water

[#57] Percentage of silica in a good brick earth lies between

(A) 5 to 10%

(B) 20 to 30%

(C) 50 to 60%

(D) 70 to 80%

Correct Answer

(C) 50 to 60%

[#58] The percentage of alumina in a good brick earth lies between

(A) 5 to 10%

(B) 20 to 30%

(C) 50 to 60%

(D) 70 to 80%

Correct Answer

(B) 20 to 30%

[#59] Asbestos . . . . . . . .

(A) Is a natural fibrous mineral substance

(B) Is composed of hydrous silicates of calcium and magnesium (CaSiO 3 , 3MgSiO 3 )

(C) Contains iron oxide and alumina

(D) All the above

(E) Is an excellent insulator for heat and electricity

(F) Is fire-proof and acid proof

(G) Has specific gravity equal to 3.10

(H) All the above

Correct Answer

(D) All the above
(H) All the above

[#60] Asbestos cement . . . . . . . .

(A) Is brittle

(B) Warps due to changes in humidity

(C) Strength is lowered when saturated by water

(D) All of the above

Correct Answer

(D) All of the above

Building Materials - Study Mode

[#56] Slacking of lime is affected by

Correct Answer

[#57] Percentage of silica in a good brick earth lies between

Correct Answer

[#58] The percentage of alumina in a good brick earth lies between

Correct Answer

[#59] Asbestos . . . . . . . .

Correct Answer

[#60] Asbestos cement . . . . . . . .

Correct Answer