1. The red colour of brick is due to ______.
[A] magnesia
[B] iron oxide
[C] silica
[D] alumina
Answer: Option B
2. In stone masonry the direction of pressure line is _____.
[A] Perpendicular to natural bed
[B] inclined to natural bed at 30 degrees
[C] inclined to natural bed at 45 degress
[D] Parallel to natural bed
Answer: Option A
3. Stone generally used for railway ballast is _____.
[A] Dolomite
[B] Marble
[C] Basalt or trap basalt
[D] Sandstone
Answer: Option C
4. Galvanising means covering iron with a thin coat of ______.
[A] glaze
[B] zinc
[C] coaltar
[D] tin
Answer: Option B
5. Purest form of iron is _____.
[A] mild steel
[B] high carbon steel
[C] wrought iron
[D] cast iron
Answer: Option B