Igneous Petrology – MCQs

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1. Igneous rocks are formed by the:





2. Magma rich in silica tends to produce:





3. Which of the following is an intrusive igneous rock?





4. Which of the following is an extrusive igneous rock?





5. Granite is mainly composed of:





6. Which texture indicates very rapid cooling of lava?





7. Pegmatites are characterized by:





8. Basalt is the volcanic equivalent of:





9. Rhyolite is the volcanic equivalent of:





10. Andesite is the volcanic equivalent of:





11. The dominant mineral in peridotite is:





12. A rock showing both coarse and fine grains has:





13. Pyroclastic rocks are formed by:





14. Pumice is:





15. Obsidian is:





16. Bowen’s reaction series explains:





17. Which mineral crystallizes first in Bowen’s discontinuous series?





18. Which mineral crystallizes last in Bowen’s series?





19. Igneous rocks with more than 65% silica are called:





20. Basalt is rich in:





21. Granite texture is generally:





22. Which intrusive body is discordant and tabular?





23. Which intrusive body is concordant and tabular?





24. A large intrusive igneous body exposed at the surface is called:





25. A dome-shaped concordant intrusive body is called:





26. Igneous rocks with less than 45% silica are:





27. Which rock is intermediate in composition?





28. The process of magma absorbing surrounding rocks is:





29. Partial melting of mantle peridotite produces:





30. Magma mixing occurs when:





31. Igneous rocks with high iron and magnesium content are called:





32. Which rock is the most common on the ocean floor?





33. Which igneous rock is most abundant in continental crust?





34. The continuous branch of Bowen’s series refers to:





35. Which mineral is characteristic of granite?





36. Igneous rocks formed from magma rich in gas often show:





37. Which of the following is a pyroclastic rock?





38. Which of the following is the plutonic equivalent of andesite?





39. Kimberlite pipes are economically important for:





40. Layered igneous intrusions are important sources of:





41. Igneous rocks with two distinct crystal sizes show:





42. Columnar jointing commonly develops in:





43. Which volcanic rock has a frothy texture and can float on water?





44. The silica content of basalt is about:





45. Which intrusive igneous rock is coarse-grained and mafic?





46. Igneous rocks with less than 10% quartz are called:





47. The texture of obsidian is:





48. Which process leads to different igneous rocks from a single magma?





49. Pillow lavas form:





50. Which of the following rocks is ultramafic?





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