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71.

Jhama bricks are

A.	well burnt having smooth and even surface	B.	slightly over burnt having rough surface
C.	under burnt and can be easily broken	D.	over burnt with irregular shape

72.

The compressive strength of perforated bricks should not be less than

A.	4 MN/m2	B.	5 MN/m2
C.	6 MN/m2	D.	7 MN/m2

73.

The compressive strength of paving bricks should not be less than

A.	20 MN/m2	B.	30 MN/m2
C.	40 MN/m2	D.	50 MN/m2

74.

The length of a curved tile varies from

A.	10 to 12 cm	B.	12 to 15 cm
C.	15 to 20 cm	D.	20 to 22.5 cm

75.

Which of the following statement is wrong?

A.	The pan tiles are similar to pot tiles, but are less curved.	B.	The pan tiles are comparatively heavier, stronger and durable than curved tiles.
C.	The fire bricks are generally used for lining kilns.	D.	none of the above

76.

For one cubic metre of brick masonry, the number of bricks required are

A.	400	B.	450
C.	500	D.	550

77.

The dolomite bricks are

A.	ordinary bricks	B.	acid refractory bricks
C.	basic refractory bricks	D.	neutral refractory bricks

78.

A good refractory brick should withstand high temperature. It should also have low coefficient of expansion and contraction.

Yes

79.

Lime is used

A.	as a matrix for concrete	B.	for plastering walls, ceilings etc.
C.	for improving soil for agricultural purposes	D.	all of the above

80.

Lime occurs in a free state in nature.

True

False