Building Materials - Section 4 | Multiple Questions and Answers

37.	Plastic bitumen is generally used for

	A.	road pavements
	B.	expansion joints
	C.	crack fillings
	D.	none to these.

38.	Pick up the correct statement from the following:

	A.	The heating of a material to redness in contact with air, is known as calcination
	B.	The property of lime by which it sets or hardens in damp places having no free circulation of air is called setting
	C.	The product that remains after calcination of limestone, is called lime
	D.	All the above.

39.	The commonly used thinner in oil paints, is

	A.	naptha
	B.	turpentine
	C.	both (a) and (b)
	D.	neither (a) nor (b)

40.	Cast iron

	A.	is obtained by purifying pig iron
	B.	is manufactured in required shapes
	C.	may contain 2 to 5 per cent of carbon with other impurities
	D.	all the above.