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46 ____________ can be used in the preparation of artificial polarizer.
1 Quinine calcium sulphate
2 Lead sulphate
3 Mixture of lead and iodine
4 Quinine iodine sulphate

Answer: Quinine iodine sulphate
47 The chemical composition of sillimanite is
1 Al2O3 Si02
2 AL203 Si02-2H20
3 A1203 2H20
4 A1203 -4H20

Answer: Al2O3 Si02
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48 A biaxial mineral is positive if
1 X is acute bisectrix
2 Z is acute bisectrix
3 Y is acute bisectrix
4 Z is obtuse bisectrix

Answer: Z is acute bisectrix
49 The highest interference colour is produced in a thin section which is
1 parallel to the optic axis
2 perpendicular to the optic axis
3 at an angle of 15° from the cleavage direction
4 at an angle of 45° from the vibration direction

Answer: at an angle of 45° from the vibration direction
50 Which one of the following is a non-pleochroic mineral?
1 Biotite
2 Muscovite
3 Hypersthene
4 Garnet

Answer: Muscovite
51 is mineralogically equivalent to granite.
1 Aplite
2 Gabbro
3 Dolerite
4 Syenite

Answer: Aplite
52 is the volcanic equivalent of granodiorite.
1 Rhyolite
2 Dacite
3 Trachyte
4 Phonolite

Answer: Dacite
53 Graphic texture is a product of crystallization at
1 tripple point
2 incongruent point
3 eutectic point
4 quadrotectic point

Answer: eutectic point
54 Which of the following may not be of metamorphic origin?
1 Granite
2 Basalt
3 Trachyte
4 Gabbro

Answer: Granite
55 Ophitic texture is commonly exhibited by
1 lamprophyre
2 dolerite
3 harzburgite
4 trachyte

Answer: dolerite
56 Batholiths are always associated with
1 earthquake zones
2 orogenic belt
3 island arc
4 fold and faults

Answer: orogenic belt
57 texture is absent in plutonic igneous rocks.
1 Holohyaline
2 Holocrystalline
3 Porphyritic
4 Granitic

Answer: Holohyaline
58 Conglomerate with compositionally one type of pebble is called
1 polymictic conglomerate
2 oligomictic conglomerate
3 intraformational conglomerate
4 interformational conglomerate

Answer: oligomictic conglomerate
59 Pudding stone is a synonymous term for
1 breccia
2 grit
3 khondalite
4 conglomerate

Answer: conglomerate
60 is a light-coloured sandstone with at least 25% feldspar.
1 Orthoquartite
2 Arkose
3 Greywacke
4 Grit

Answer: Arkose

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