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Internal Structure of the Earth

36 MCQ questions with answers and explanations · page 1 of 2

Test yourself▶ 25 question test

Q1. What is the source of the most important information regarding the internal structure of the Earth?

  1. Aunnatural sources
  2. Bseismology
  3. CVolcanic activity
  4. Dplate tectonics
Show answer & explanation

Answer: B) seismology

Q2. Who divides the geology into Sial, Sima and Nife?

  1. Avan der Graat
  2. BDaily
  3. CHolmes
  4. DSwes
Show answer & explanation

Answer: D) Swes

Q3. What would be the correct order of the following from the Earth's surface towards the centre? 1. Seima 2. Sial 3. Nife

  1. A1,2,3
  2. B2,1,3
  3. C1,3,2
  4. D3,2,1
Show answer & explanation

Answer: B) 2,1,3

Q4. Which of the following statements is true?

  1. ARocks like granite and gneiss are predominant in Sial.
  2. BThe range is mainly composed of rocks like basalt and gabbro.
  3. CThe core is rich in elements like nickel and iron.
  4. DAll of the above
Show answer & explanation

Answer: D) All of the above

Q5. Which layer of the earth's surface has abundance of basalt rocks?

  1. ASial
  2. BLimit
  3. CNife
  4. Din none of the
Show answer & explanation

Answer: B) Limit

Q6. In which part of the Earth is nickel and iron predominant?

  1. ASial
  2. BLimit
  3. CNife
  4. Din none of the
Show answer & explanation

Answer: C) Nife

Q7. Who first used the word "Sial" for the uppermost layer of the Earth?

  1. AHolmes
  2. BSwes
  3. CJefferies
  4. DDaily
Show answer & explanation

Answer: B) Swes

Q8. What is the name of the second layer from the top among the three concentric layers of the Earth?

  1. ASial
  2. BLimit
  3. CNife
  4. Dnone of these
Show answer & explanation

Answer: B) Limit

Q9. The magnetic substance found at the centre of the Earth is

  1. AGranite
  2. Bbasalt
  3. CNickel
  4. DDiorite
Show answer & explanation

Answer: C) Nickel

Q10. Suess divided the Earth's interior into three parts. His division does not include –

  1. ASial
  2. BLimit
  3. CNife
  4. DSubstratum
Show answer & explanation

Answer: D) Substratum

Q11. "Lithosphere" means -

  1. AEarth's interior
  2. Bthe central part of the Earth
  3. Cupper part of the earth
  4. DEarth's outer crust
Show answer & explanation

Answer: D) Earth's outer crust

Q12. How much thickness of the lithosphere has been measured on the basis of seismic waves?

  1. A105 km
  2. B100 km
  3. C200 km
  4. D80 km
Show answer & explanation

Answer: B) 100 km

Q13. Which of the following layers is called the barysphere?

  1. Athe uppermost layer of the atmosphere
  2. Bthe uppermost layer of the Earth
  3. CEarth's innermost layer
  4. DEarth's intermediate layer
Show answer & explanation

Answer: C) Earth's innermost layer

Q14. What is the rate of increase of temperature with depth as we move from the surface to the earth's crust?

  1. A1 °Cper 165 meters
  2. B1°C per 165 feet
  3. C1°C per 32 meters
  4. D1°C per 32 feet
Show answer & explanation

Answer: C) 1°C per 32 meters

Q15. Based on the Earth's internal structure, the Earth's crust is divided into the crust, mantle, and core. Whose division is this?

  1. AHolmes
  2. BJefferies
  3. CDaily
  4. DGrant
Show answer & explanation

Answer: D) Grant

Q16. Which of the following statements is false?

  1. AThe average thickness of the earth's crust is about 33 km.
  2. BThe thickness of the earth's crust is greater in the continental part whereas it is shallower in the oceanic part.
  3. CThe oceanic crust is mainly composed of granite rocks.
  4. DThe density of continental crust is higher than that of oceanic crust.
Show answer & explanation

Answer: D) The density of continental crust is higher than that of oceanic crust.

Q17. What type of rocks make up the ocean floor?

  1. AGranite
  2. Bbasalt
  3. Cflaky
  4. DGabbro
Show answer & explanation

Answer: B) basalt

Q18. Which of the following statements regarding the mantle is false?

  1. AIts depth ranges from 35 km to 2900 km.
  2. BIts entire part is in plastic state.
  3. C83.5% of the Earth's volume and 67.8% of its mass is the mantle.
  4. DIts density ranges from 3.0 to 5.5.
Show answer & explanation

Answer: B) Its entire part is in plastic state.

Q19. The lithosphere includes –

  1. Aupper crust only
  2. Bboth the upper crust and the lower crust
  3. Cthe upper crust, lower crust, and the solid upper part of the mantle
  4. Dnone of these
Show answer & explanation

Answer: C) the upper crust, lower crust, and the solid upper part of the mantle

Q20. How many kilometers deep does the lithosphere extend to?

  1. A80 km.
  2. B100 km.
  3. C180 km.
  4. D200 km.
Show answer & explanation

Answer: B) 100 km.

Q21. Which of the following is called "White of the Earth"?

  1. Acrust
  2. Bmental
  3. CCorner
  4. Dnone of these
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Answer: B) mental

Q22. Which of the following elements predominate in the mantle?

  1. Asilica and manganese
  2. Bsilica and aluminum
  3. Csilica and magnesium
  4. Dsilica and iron
Show answer & explanation

Answer: C) silica and magnesium

Q23. Approximately what percentage of the Earth's total mass is found in the mantle?

  1. A0.32
  2. B0.52
  3. C0.68
  4. D0.83
Show answer & explanation

Answer: C) 0.68

Q24. The Moho discontinuity is located at

  1. Abetween the crust and the mantle
  2. Bbetween the upper mantle and the lower mantle
  3. Cbetween the mantle and the core
  4. Dbetween the inner mantle and the outer mantle
Show answer & explanation

Answer: A) between the crust and the mantle

Q25. Which elements predominate in the Earth's core?

  1. Asilica and aluminum
  2. Bsilica and magnesium
  3. Csilica and nickel
  4. Diron and nickel
Show answer & explanation

Answer: D) iron and nickel

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