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Compare the characteristics of sedimentary and igneous rocks and select the correct statement.

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Free III Grade Overseer (Civil) Practice Questions

Special RecruitmentThe III Grade Overseer (Civil) exam is conducted by the Kerala Public Service Commission for Scheduled Caste and Scheduled Tribe candidates of Kerala. This exam offers a government job in the Public Works Department with a pay scale of ₹26,500-60,700. The selection is through direct recruitment, focusing on candidates with SSLC or equivalent qualifications and relevant civil engineering certificates. The exam is online application-based with no fee, and candidates must register via the official Kerala PSC portal.2 VacanciesAge Limit: 18-41 yearsProbation: 2 yearsKerala PSCScheduled Caste/ST OnlyApply online before 03.09.2025

Try 15 free syllabus-aligned practice questions for the III Grade Overseer (Civil) exam. Each question includes instant feedback so you can learn as you go. No sign-up required.

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Q1. Compare the characteristics of sedimentary and igneous rocks and select the correct statement.

  1. Sedimentary rocks are formed by cooling of magma; igneous rocks by deposition of sediments.
  2. Igneous rocks often contain fossils; sedimentary rocks do not.
  3. Sedimentary rocks are typically layered; igneous rocks are usually crystalline and non-layered.
  4. Both sedimentary and igneous rocks form under high pressure and temperature conditions.

Q2. A sample of a metamorphic rock weighs 2500 kg and has a volume of 1.25 m³. Calculate its density and identify which common metamorphic rock it most likely represents, given typical densities: Slate (2700 kg/m³), Marble (2800 kg/m³), Quartzite (2650 kg/m³), Schist (2600 kg/m³).

  1. 2000 kg/m³, likely Schist
  2. 2500 kg/m³, likely Slate
  3. 2000 kg/m³, likely Marble
  4. 2000 kg/m³, likely none of the above

Q3. What is the primary geological process responsible for the formation of metamorphic rocks?

  1. Cooling and solidification of magma
  2. Deposition of sediments
  3. Heat and pressure altering existing rocks
  4. Weathering and erosion

Q4. During a site inspection, you find a dark-colored igneous rock with fine grains and vesicles. Which rock type is this most likely to be, and what is a common use for it?

  1. Granite; used for monuments and countertops.
  2. Basalt; used for road base and aggregate.
  3. Scoria; used for lightweight concrete and landscaping.
  4. Obsidian; used for cutting tools and decorative items.

Q5. Which of the following is a common intrusive igneous rock widely used as a building stone due to its durability and aesthetic appeal?

  1. Basalt
  2. Granite
  3. Pumice
  4. Obsidian

Q6. A construction project requires a stone that is resistant to weathering and has a fine-grained texture. Which metamorphic rock would be most suitable?

  1. Slate
  2. Quartzite
  3. Marble
  4. Schist

Q7. Identify the type of rock formed by the cooling and solidification of magma or lava.

  1. Sedimentary rock
  2. Metamorphic rock
  3. Igneous rock
  4. Fossiliferous rock

Q8. Which of the following is a common type of sedimentary rock used extensively in construction due to its durability and ease of shaping?

  1. Granite
  2. Sandstone
  3. Marble
  4. Basalt

Q9. Compare the durability of igneous stones with sedimentary stones for use in heavy construction projects.

  1. Igneous stones are generally less durable than sedimentary stones.
  2. Sedimentary stones have higher durability than igneous stones.
  3. Igneous stones are generally more durable and stronger than sedimentary stones.
  4. Both have equal durability regardless of type.

Q10. A construction engineer needs a stone that has undergone intense heat and pressure but was originally sedimentary. Which classification of stone should he select?

  1. Igneous stone
  2. Metamorphic stone
  3. Sedimentary stone
  4. Artificial stone

Q11. What is the primary process responsible for the formation of sedimentary rocks?

  1. Cooling and solidification of magma
  2. Deposition, compaction, and cementation of sediments
  3. Metamorphism due to heat and pressure
  4. Crystallization from evaporating solutions

Q12. A sedimentary rock sample weighs 2500 kg and has a volume of 1.5 cubic meters. Calculate its density and identify which common sedimentary rock it most likely represents, given typical densities: Sandstone (2200-2600 kg/m³), Limestone (2300-2700 kg/m³), Shale (2400-2700 kg/m³).

  1. Density = 1666.7 kg/m³; likely Sandstone
  2. Density = 3750 kg/m³; likely Limestone
  3. Density = 1666.7 kg/m³; likely Shale
  4. Density = 1666.7 kg/m³; none of the above

Q13. Compare the porosity of sandstone and shale and explain how this difference affects their use in construction and water filtration.

  1. Sandstone has higher porosity than shale, making it better for water filtration but less stable for construction.
  2. Shale has higher porosity than sandstone, making it better for construction and water filtration.
  3. Both have similar porosity, so their uses in construction and filtration are identical.
  4. Sandstone has lower porosity than shale, making it less suitable for water filtration.

Q14. Identify the type of stone formed by the cooling and solidification of molten magma.

  1. Sedimentary stone
  2. Metamorphic stone
  3. Igneous stone
  4. Limestone

Q15. A rock sample weighs 2500 grams and has a volume of 1000 cm³. If this rock is classified as igneous, what is its density in g/cm³?

  1. 0.4 g/cm³
  2. 2.5 g/cm³
  3. 25 g/cm³
  4. 250 g/cm³
Free III Grade Overseer (Civil) Practice Questions | Kerala PSC Prep