31) 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 the above

32) Siliceous rocks have alumina or clay as their major constituent.

• (a) Yes
• (b) No

33) Argillaceous rocks have their main constituent as

• (a) carbonates of lime
• (b) clay or alumina
• (c) silica or sand
• (d) all of these

34) The colour of granite is

• (a) grey
• (b) green
• (c) brown
• (d) all of these

35) 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 the above