16) Which of the following is a stratified rock?

• (a) Sedimentary rock
• (b) Metamorphic rock
• (c) Igneous rock
• (d) all of these

17) Chemically, marble is known as

• (a) metamorphic rock
• (b) argillaceous rock
• (c) calcareous rock
• (d) siliceous rock

18) Slate in the form of tiles is used

• (a) for paving
• (b) as road metal
• (c) as an excellent roof covering material
• (d) for the manufacture of cement

19) Granite is mainly composed of

• (a) quartz and mica
• (b) felspar and mica
• (c) quartz and felspar
• (d) quartz, felspar and mica

20) Sand stone is

• (a) sedimentary rock
• (b) metaphonic rock
• (c) igneous rock
• (d) volcanic rock