GATE (Graduate Aptitude Test in Engineering) Geology & Geophysics: Questions 123 - 124 of 158

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Question 123

Binary and Ternary Phase Diagrams

Appeared in Year: 2014

Question

MCQ▾

In the given ternary (Fo = Forsterite; Di = diopside; An = Anorthite) eutectic diagram, the point A represents the composition of magma. What will be the sequence of crystallization during cooling of this magma? (Carry two marks each)

Fo = Forsterite; Di = Diopside; An = Anorthite

Choices

Choice (4)Response

a.

Olivine and olivine + pyroxene

b.

Olivine, olivine + pyroxene and olivine + pyroxene + plagioclase

c.

Olivine, olivine + plagioclase and olivine + plagioclase + pyroxene

d.

Olivine and olivine + plagioclase

Question 124

Appeared in Year: 2014

Question

Match List-Ⅰ List-Ⅱ▾

Match the items in Group I with those in Group II (Carry two marks each)

List-Ⅰ (Column-I)List-Ⅱ (Column-II)
(A)

Twinkling

(i)

Property of a single grain seen under microscope under crossed nicols

(B)

Pleochroism

(ii)

Property of a mineral seen in hand specimen

(C)

Interference colour

(iii)

Property of a single grain seen under microscope in polarized light

(D)

Play of colour

(iv)

Property seen when several grains are viewed collectively under microscope in polarized light

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (ii)
  • (iii)
  • (i)
  • (iv)

b.

  • (i)
  • (iii)
  • (iv)
  • (ii)

c.

  • (iii)
  • (iv)
  • (i)
  • (ii)

d.

  • (iv)
  • (iii)
  • (i)
  • (ii)

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