Chapter-2[Inside our Earth]
1. The rock which is made up of molten magma is
a) Igneous
b) Sedimentary
c) Metamorphic
d) lava
Answer. a. Igneous
Igneous rock forms after the cooling of molten magma. Igneous rock is also called primary rock.
The loose materials of rocks are compressed and hardened to form layers of rocks, this type of rock is called sedimentary rock.
Under great heat and pressure, igneous and metamorphic rocks get converted to other forms of rock called metamorphic rock.
2. The innermost layer of the earth is
a) Crust
b) Core
c) Mantle
d) Asthenosphere
Answer. b. Core.
The innermost layer of the earth is called the Core.
The radius of the core is about 3500 km and it is made up of NiFe( nickel and ferrous).
3. Gold, petroleum, and coal are examples of
a) Rocks
b) Minerals
c) Fossils
d) Energy
Answer. b. Minerals
Minerals are a kind of rock that has definite physical properties and define the chemical composition.
Gold, petroleum, and coal are examples of Minerals.
4. Rocks that contain fossils are
a) Sedimentary rocks
b) Metamorphic rocks
c) Igneous rocks
d) Coastal rocks
Answer. a. Sedimentary rocks.
Sedimentary rocks are made up of layers and between the layer, they contained fossils of plants, animals, and microorganisms.
5. The thinnest layer of the earth is
a) Crust
b) Mantle
c) Core
d) Outer Core
Answer. a. Crust.
The thinnest layer of the earth is called the crust.
Crust: It is around 35 km on continents and 5 km on the ocean.
Mantle: 2900 km
Core: 3500 km
6. Match the following.
i) Core (a) Changes into slate
ii) Minerals (b) Used for roads and buildings
iii) Rocks (c) Made of silicon and alumina
iv) Clay (d) Has the definite chemical composition
v) Sial (e) Innermost layer
Answer.
- (Core)Innermost Layer
- (Minerals)has a definite chemical composition
- (rocks)used for roads and building
- (clay)changes into slates
- (Sia)made up of Silicon and Alumina
7. The deepest mine in the world is in which country?
a) Finland
b) Australia
c) South Africa
d) Australia
Answer. c) South Africa, is 4km deep.
8. The uppermost layer of the earth's surface is called?
a) Core
b) Mantle
c) Crust
d) Lithosphere
Answer. c) Crust
9. What is the thickness of the earth's crust on the continental mass?
a) 5 km
b) 35 km
c) 2900 km
d) 3500 km
Answer. b) 35 km
10. What is the thickness of the earth's crust on the oceanic floors?
a) 5 km
b) 35 km
c) 2900 km
d) 3500 km
Answer. a) 5 km
11. Which of the following is the thinnest of all layers of the earth?
a) Core
b) Mantle
c) Crust
d) Lithosphere
Answer. c) Crust
12. Which of the following are the main constituents of continental crust?
a) Silica and magnesium
b) Silica and alumina
c) Nickel and ferrous
d) oxygen and iron
Answer. b) Silica and alumina
13. Which of the following are the main constituents of the oceanic crust?
a) Silica and magnesium
b) Silica and alumina
c) Nickel and ferrous
d) oxygen and iron
Answer. a) Silica and magnesium
14. Which of the following are the main constituents of the core?
a) Silica and magnesium
b) Silica and alumina
c) Nickel and ferrous
d) oxygen and iron
Answer. c) Nickel and ferrous
15. What is the thickness of the earth's mantle?
a) 5 km
b) 35 km
c) 2900 km
d) 3500 km
Answer. c) 2900 km
16. What is the radius of the innermost layer of the earth[core]?
a) 5 km
b) 35 km
c) 2900 km
d) 3500 km
Answer. d) 3500 km
17. What is the radius of the earth?
a) 6371 km
b) 6381 km
c) 6471 km
d) 6481 km
Answer. a) 6371 km
18. What is the volume of the earth's crust with respect to the total volume of the earth?
a) 1 %
b) 15 %
c) 84 %
d) 90 %
Answer. a) 1 %
19. What is the volume of the earth's mantle with respect to the total volume of the earth?
a) 1 %
b) 15 %
c) 84 %
d) 90 %
Answer. c) 84 %
20. What is the volume of the earth's core with respect to the total volume of the earth?
a) 1 %
b) 15 %
c) 84 %
d) 90 %
Answer. b) 15 %
21. Which of the following is also called primary rock?
a) Igneous rock
b) Metamorphic rock
c) Sedimentary rock
d) All of the above
Answer. a) Igneous rock
22. When the molten magma cools, it becomes solid. Rocks thus formed are called?
a) Igneous rock
b) Metamorphic rock
c) Sedimentary rock
d) None
Answer. a) Igneous rock
23. When the molten lava comes to the earth’s surface, it rapidly cools down and becomes solid. Rocks formed in such a way on the crust are called?
a) Extrusive igneous rocks
b) Intrusive igneous rocks
c) Metamorphic rock
d) Sedimentary rock
Answer. a) Extrusive igneous rocks
24. Basalt rock is an example of which one of the following rock types?
a) Extrusive igneous rocks
b) Intrusive igneous rocks
c) Metamorphic rock
d) Sedimentary rock
Answer. a) Extrusive igneous rocks[ fine-grained structure]
25. The molten magma cools down deep inside the earth’s crust. Solid rocks so formed are called?
a) Extrusive igneous rocks
b) Intrusive igneous rocks
c) Metamorphic rock
d) Sedimentary rock
Answer. b) Intrusive igneous rocks
26. Which of the following statement is not correct?
a) Extrusive igneous rocks have a very fine-grained structure.
b) Intrusive igneous rocks have large grains structure.
c) Granite is an example of extrusive igneous rock.
d) Basalt rock is an example of extrusive igneous rock.
Answer. c) Granite is an example of extrusive igneous rock. Granite is an example of intrusive igneous rock.
27. Grinding stones used to prepare paste/powder of spices and grains are made of which type of rocks?
a) Basalt rock
b) Granite rock
c) Metamorphic rock
d) Sedimentary rock
Answer. b) Granite rock [ intrusive igneous rock]
28. The remains of the dead plants and animals trapped in the layers of rocks are called?
a) Rocks
b) Minerals
c) Fossils
d) All of the above
Answer. c) Fossils
29. Rocks roll down, crack, and hit each other and are broken down into small fragments. These smaller particles are called?
a) Basalt rock
b) Granite rock
c) Metamorphic rock
d) Sediments
Answer. d) Sediments
30. Which of the following rocks contain fossils of plants, animals, and other microorganisms?
a) Basalt rock
b) Granite rock
c) Metamorphic rock
d) Sedimentary rock
Answer. d) Sedimentary rock
31. Sandstone is an example of which type of rock?
a) Igneous rock
b) Metamorphic rock
c) Sedimentary rock
d) Both b & c
Answer. c) Sedimentary rock
32. Which of the following rock is an example of metamorphic rock?
a) Clay
b) Limestone
c) Both a &b
d) Marble
Answer. d) Marble; clay to slate[ metamorphic rock], limstone to marble[ metamorphic rock].
33. Red Fort is made up of which type of rocks?
a) Red Marble
b) Red Sandstone
c) Red Limestone
d) White Marble
Answer. b) Red Sandstone
34. The Taj Mahal is made up of which type of rocks?
a) Red Marble
b) Red Sandstone
c) Red Limestone
d) White Marble
Answer. d) White Marble
35. The process of transformation of the rock from one to another is known as the?
a) Rock Mining
b) Rock grinding
c) Sedimentation
d) rock cycle
Answer. d) rock cycle
36. Naturally occurring substances that have certain physical properties and definite chemical composition are called?
a) Rock
b) Fossil
c) Mineral
d) Fertilizer
Answer. c) Mineral
37.
You May Like also:
- Chapter-1 [Environment]
- Chapter-2[Inside our Earth]
- Chapter-3[ Our Changing Earth]
- Chapter-4 [Air]
- Chapter-5 [Water]
- Chapter-6 [ Natural Vegetation and Wild Life]
- Chapter-7 [ Human Settlement -Settlement, Transport, and Communication]
- Chapter-8[ Human-Environment Interactions: The Tropical and subtropical region]
- Chapter-9[ Life in the Deserts]
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