1. Which is the uppermost stage of the Quaternary period?
- Calabrian
- Northgrippian
- Greenlandian
- Meghalayan
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Answer: Meghalayan
The Meghalayan age is the latest and the uppermost stage of the Quaternary period. It belongs to the Holocene Epoch.
2. In which Eon did the formation of the Moon take place?
- Hadean
- Archean
- Phanerozoic
- Proterozoic
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Answer: Hadean
The formation of the Moon took place in the Hadean Eon (around 4533- 4527 million years ago).
3. Which among the following is correct about Chronostratigraphy?
- It is the study of plates and plate tectonics
- It is the study of the flow of rivers and its evolution
- It is the study of the age of rock with relation to time
- It is the study of mountains and their evolution
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Answer: It is the study of the age of rock with relation to time
Chronostratigraphy is the branch of stratigraphy that studies the age of the rock strata with relation to time.
4. Which among the following Eon is not included in the Precambrian Supereon?
- Hadean
- Archean
- Phanerozoic
- Proterozoic
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Answer: Phanerozoic
Hadean, Archean, and Proterozoic are part of the Precambrian Supereon.
5. Which among the following is not an Eon?
- Archean
- Hadean
- Palaeozoic
- Proterozoic
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Answer: Palaeozoic
There are four Eons – Hadean, Archean, Proterozoic, and Phanerozoic. Palaeozoic is an Era.
6. Mohorovičić discontinuity is also known as a boundary between?
- Earth’s crust and mantle
- Sial and Sima
- Lithosphere and Exosphere
- Mantle and Earth’s Core
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Answer: Earth’s crust and mantle
The Mohorovicic Discontinuity, or “Moho,” is the boundary between the crust and the mantle. Guttenberg is between the Mantle and outer core, Lehman is between the outer core and inner core.
7. Lithosphere includes the crust and the uppermost mantle, which constitute the hard and rigid outer layer of the planet in the range of 0 to _____?
- 10 km
- 20 km
- 200 km
- 800 km
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Answer: 200 km
It consists of three main layers: crust, mantle, and core. The crust and solid mantle range from 0 to 200 km. The liquid mantle is there from 200 to about 2900 km.
8. Lithosphere is the combination of?
- Upper core and lower core
- Upper crust and lower mantle
- Crust and uppermost part of mantle
- Mantle and core
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Answer: Crust and uppermost part of mantle
Lithosphere refers to the portion of depth up to 200 km from the surface of the earth. The crust and the uppermost part of the mantle are called the lithosphere. Its thickness ranges from 10-200 km.
9. Which of the following is known as the thinnest layer of the earth?
- Crust
- Mantle
- Core
- None of the above
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Answer: Crust
The crust is the thinnest layer of the lithosphere of the Earth. It is usually distinguished from the underlying mantle by its chemical makeup. It is the thinnest layer as it extends only from 30-45 km on land and 5-10 km in the ocean.
10. Which of the following is known as the most dense layer of the earth?
- Core
- Crust
- Mantle
- Magma
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Answer: Core
The Core is the densest layer of the earth. The density of the core ranges from 9.5 to 14.5 and sometimes even higher (13g/cm3). The density of the Mantle varies from 3.3 to 5.7 (3.4 gm/cm3), and the density of the Crust varies from 2.70 to 2.95 (3g/cm3).
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