ONGC Geology (Mineralogy) Test Paper

ONGC Geology (Mineralogy)  Test Paper

Mineralogy Solved Paper

Q.1: Garnets are characterized by their:

a) Rhombododecahedron form

b) Trapezohedran form

c) Octahedron form

d) Both (a) 8. (b)

Answer. (d)

Q.2: Which is orthorhombic Epidote:

a) Zoisite

b) Clinozoisite

c) Orthite

d) Piedmontite

Answer. (a)

Q.3: Transparent and red colour gem variety of zircon is known as:

a) Jargoon

b) Hyacinth

c) Zirconite

d) Monazite

Answer. (b)

Q.4: Sphene is:

a) Magnesium silicate

b) Calcium iron silicate

c) Calcium titanosilicate

d) lron titanosilicate

Answer. (c)

Q.5: Andalusite and sillimanite crystallise in:

a) Monoclinic system

b) Triclinic system

c) Orthorhombic system

d) Hexagonal system

Answer. (c)

Q.6: What is the hardness of staurolite:

a) 5 - 5.5

5) 5 - 6

c) 6 - 6.5

d) 7 - 7.5

Answer. (d)

Q.7: Tourmaline belongs to:

a) Neso-silicate 

b) Soro-silicate

c) Cyclosilicate

d) Phyllosilicate

Answer. (c)

Q.8: Colourless variety of Tourmaline is:

a) Rebellite

b) Achroite

c) Schorl

d) None of these

Answer. (b)

   Q.9: Pyroxenes belong to:

a) Single chain structure (lnosilicate)

b) Double chain structure (lnosilicate)

c) Nesosilicate

d) Sorosllicate

Answer. (a)

Q.10: Which is calcium poor pyroxene found in volcanic rocks:

a) Pigeonite   

b) Angite

c) Diopsite

d) Hedenbergite

Answer. (a)

Q.11: What are the cleavage angles in pyroxenes:

a) Exactly 90°

b) 80° and 100°

c) 87° and 93°

d) 84° and 96°

Answer. (c)

Q.12: Emerald is a pale green variety of:

a) Topaz.

b) Zircon.

c) Beryl.

d) Tourmaline

Answer. (c)

Q.13: Schillerization is characteristic of:

a) Diopside

b) Hypersthene

c) Enstatite

d) Hedenbergite

Answer. (b)

Q.14: What is the hardness of pyroxenes:

a) 4-5

b) 5-6

c) 6-7

d) 7-8

Answer. (b)

Q.15: Amphiboles are:

a) Hydrous ferro - magnesian silicates

b) Ferro – magnesian siIicates

c) Potassium - aluminium silicates

d) Hydrated alumio silicates

Answer. (a)

Q.16: What are the cleavage angles in amphiboles:

a) 70° and 110°

b) 67° and 113°

c) 56° and 124°

d) 54° and 126°

Answer. (c)

   Q.17: Mica belongs to:

a) Nesosilicate

b) Sorosilicate

c) Phyllosilicate

d) lnosilicate

Answer. (c)

Q.18: Lepidolite mica is:

a) Cr - bearing

b) Fl - bearing.

c) Li - bearing.

d) Fe - bearing.

Answer. (c)

Q.19. Cations from soil moisture are attracted to the surface of clay minerals to:

a) Balance the unsatisfied valence bonds.

b) Balance the negative electrical charge

c) Form diffuse - double layer

d) Replace the low valence bonds

Answer. (b)

   Q.20: Which mineral does not belong to chlorite group:

a) Penninite

b) Clinochlore

c) Prochlorie

d) Fayalite

Answer. (d)

  

Q.21: Kaolinite results from the alteration of the:

a) Quartzs

b) Felspars

c) Micas

d) Ampliboles

Answer. (b)

Q.22: Bentonite is belived to result from the:

a) Weathering of granites.

b) Decomposition of syenite

c) Decomposition of volcanic ash.

d) Decomposition of Fe-bearing rocks.

Answer. (c)

Q.23: Dravite is:

a) Ca - pyroxene

b) Mg - Tourmaline

c) Fe - Tourmaline .

d) Mg – Angite

Answer. (b)

   Q.24: Hyalophane isomorphous series is between:

a) K - felspar and Na felspar

b) K - felspar and Ca felspar

c) K - felspar and Ba felspar

d) Na - felspar and Ca felspar

Answer. (c)

Q.25 : Low-temperature orthoclase is known as:

a) Sanidine

b) Adularia

c) Aventurine

d) Moonstone

Answer. (b)