2001 General Studies, all questions

UPSC Prelims 2001 · General Studies

Question 122: Geography

Quartzite is metamorphosed from

aLimestone
bObsidian
cSandstone
dShale

AnswerThe answer is (c).

Quartzite is a metamorphic rock formed from sandstone, which is made mostly of quartz grains; heat and pressure fuse the grains into a hard, compact rock. Limestone changes to marble and shale to slate, while obsidian is a volcanic glass, an igneous rock. Remember the common pairs: limestone-marble, shale-slate, sandstone-quartzite, granite-gneiss.

Why each option is right or wrong
  • (a) Limestone becomes marble.
  • (b) Obsidian is an igneous volcanic glass.
  • (c) Right: sandstone.
  • (d) Shale becomes slate.

Explanation: written by UPSC Grade, not by UPSC.

Practise this paper timedPrevious questionNext question

Source: UPSC, Civil Services (Preliminary) Examination 2001, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.