Igneous Rocks MCQ

Test your knowledge with important Igneous Rocks MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Igneous Rocks MCQs at Bissoy

• What is the approximate percentage of silica present in the igneous rocks?
  ক

  10%

  খ

  26%

  গ

  59%

  ঘ

  15%
• The mineral most abundantly present in the igneous rocks is __________
  ক

  Micas

  খ

  Titanium

  গ

  Iron

  ঘ

  Felspars
• Which is the most dominant constituent of igneous rock?
  ক

  Al2O3

  খ

  SiO2

  গ

  CaCO3

  ঘ

  CaO
• Porphyries are examples of which type of rocks?
  ক

  Volcanic

  খ

  Plutonic

  গ

  Hypabyssal

  ঘ

  Sedimentary rocks
• The rocks which exhibit mixed characteristics of volcanic and plutonic rocks are __________
  ক

  Intermediate rocks

  খ

  Mixed rocks

  গ

  Hypabyssal rocks

  ঘ

  Secondary rocks
• Pick the plutonic igneous rock.
  ক

  Granite

  খ

  Granite porphyry

  গ

  Syenite porphyry

  ঘ

  Marble
• The rock is coarse grained in __________
  ক

  Volcanic rocks

  খ

  Plutonic rocks

  গ

  Hypabyssal rocks always

  ঘ

  Not found in igneous rocks
• The plutonic rocks are formed at depths below the earth’s surface ranging
  ক

  10 to 100 km

  খ

  100 to 200 km

  গ

  7 to 10 km

  ঘ

  1 to 5 km
• Magma is hypothetical melt.
  ক

  True

  খ

  False
• What is the grain size of volcanic rocks?
  ক

  Very coarse

  খ

  Coarse

  গ

  Intermediate

  ঘ

  Very fine
• Where are the volcanic rocks formed?
  ক

  Under the surface of earth

  খ

  On the surface of earth

  গ

  Inside the core

  ঘ

  Between mantle
• What is the state of lava or magma?
  ক

  Liquid always

  খ

  Solid

  গ

  Gaseous

  ঘ

  Mixture of liquid, crystals and gases
• What are the two conditions believed to be required for the formation of igneous rocks?
  ক

  Low temperature and molten state

  খ

  Molten state and very high temperature

  গ

  Molten state and moderate temperature

  ঘ

  Crystallized state and moderate temperature
• The branch of geology which deals with various aspects of rocks is ________________
  ক

  Petrology

  খ

  Mineralogy

  গ

  Lithology

  ঘ

  Rockology