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21.

The specific gravity of stone should not, in any case be less than

A.	1	B.	1.5
C.	2	D.	2.5

22.

Which of the following statements is wrong?

A.	A stone with large percentage of quartz is very soft.	B.	Quartz has a greasy lustre.
C.	Felspar is a silicate of aluminium with varying amounts of potash, soda or lime.	D.	all of these

23.

Siliceous rocks have alumina or clay as their major constituent.

Yes

24.

Argillaceous rocks have their main constituent as

A.	carbonates of lime	B.	clay or alumina
C.	silica or sand	D.	all of these

25.

The colour of granite is

A.	grey	B.	green
C.	brown	D.	all of these

26.

A fine-grained granite

A.	offers higher resistance to weathering	B.	can be easily polished and worked
C.	is used for exterior facing of buildings	D.	all of these

27.

A limestone found in seams of great thickness in non-crystalline texture with earthy appearance, is called

A.	granular limestone	B.	compact limestone
C.	magnesium limestone	D.	lankar

28.

A limestone containing about 30% of alumina and silica is called

A.	granular limestone	B.	compact limestone
C.	magnesium limestone	D.	kankar

29.

The compressive strength of sandstone is

A.	40 MN/m2	B.	55 MN/m2
C.	65 MN/m2	D.	80 MN/m2

30.

The specific gravity of sandstone is

A.	1.1 to 1.8	B.	1.8 to 2.65
C.	2.65 to 2.95	D.	2.95 to 3.4