Building Materials - Section 1 | Multiple Questions and Answers

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Building Materials - Section 1 Multiple Questions and Answers.

26.	Due to attack of dry rot, the timber

	A.	cracks
	B.	shrinks
	C.	reduces to powder
	D.	none of these.

27.	Brittleness of cold is due to an excess of

	A.	sulphur
	B.	carbon
	C.	phosphorus
	D.	silicon.

28.	For the manufacture of Portland cement, the proportions of raw materials used, are

	A.	lime 63% ; silica 22% ; other ingredients 15%
	B.	lime 22% ; silica 63% ; other ingredients 15%
	C.	silica 40% ; lime 40% ; other ingredients 20%
	D.	silica 70% ; lime 20% ; other ingredients 10%.

29.	Asbestos cement

	A.	is brittle
	B.	warps due to changes in humidity
	C.	strength is lowered when saturated by water
	D.	all the above.

30.	Gniess is obtained from

	A.	igneous rocks
	B.	metamorphic rocks
	C.	sedimentary rocks
	D.	sedimentary metamorphic rocks.

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