Building Materials - Section 3 | Multiple Questions and Answers

6.	The silica is used for preparing

	A.	silica bricks
	B.	coke oven
	C.	lining for glass furnaces
	D.	all of these.

7.	Wrought iron is manufactured from pig iron by

	A.	refining
	B.	puddling
	C.	shingling
	D.	rolling

8.	Pick up the correct statement from the following:

	A.	The phenol is carbolic acid
	B.	The phenol is either extracted from coal-tar or prepared from benzene
	C.	Phenol reacts with formaldehyde, to form phenol formaldehyde resin
	D.	The plastics prepared from phenol-formaldehyde are used for paints, varnishes, w.c. seats

10.	Pick up the correct statement from the following:

	A.	Catalysts are added to assist and accelerate the hardening of resin,
	B.	The fillers are inert materials and they impart strength and hardness
	C.	Fibrous fillers increase thermal resistance
	D.	All the above.