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11
Between which two planets Asteroids found?
A. Earth and Mars
B. Saturn and Uranus
C. Mercury and Venus
D. Mars and Jupiter
Answer - D
Solution
Points to Know-
• Other than planets and satellites, there are many tiny bodies which move around the sun. These are asteroids
• Found between orbits of Mars and Jupiter
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12
Which of the following is the correct order of the layers of the earth?
A. Crust, Outer Core, Mantle, Inner Core
B. Mantle, Crust, Inner Core, Outer Core
C. Crust, Mantle, Outer Core, Inner Core
D. Outer Core, Crust, Inner Core, Mantle
Answer - C
Solution
Points to Know-
Earth is composed of three layers
Crust -outermost layer
Mantle – beneath the crust
Core – innermost layer
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13
Which of the following makes the biggest volume of the Earth?
A. Crust
B. Mantle
C. Outer Core
D. Inner Core
Answer - B
Solution
Points to Know-
Crust- Thinnest of all the layer It forms and makes less than 1% of earth’s volume
Mantle- It forms 84% of earth’s volume
Core- It forms 15% of earth’s volume
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14
Core is made up of-
A. Silica and aluminium
B. Nickel and aluminium
C. Silica and magnesium
D. Nickel and iron
Answer - D
Solution
Points to Know-
• CORE is the innermost layer of the earth
• It forms 15% of earth’s volume
• It is made up of nickel and iron
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15
Which of the following is true?
i. Oceanic crust of Earth is greater than continental crust of the Earth
ii. Earth is slightly flattened on the poles
iii. Innermost layer of the Earth has radius of about 3500 Km
A. Only i and ii
B. Only i and iii
C. Only ii and iii
D. All of the above
Answer - C
Solution
Points to Know-
• Earth is slightly flattened on the poles and has a bulge in the middle, that is why its shape is described as Geoid
• Earth is composed of three layers -Crust -outermost layer, Mantle – beneath the crust, Core – innermost layer (Radius about 3500 km)
• Crust is divided into two crusts: –
Continental crust (35 Km)
Oceanic crust (5 Km)
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16
What type of rocks formed on cooling of molten magma?
A. Metamorphic rocks
B. Igneous rocks
C. Sedimentary rocks
D. Both A and C
Answer - B
Solution
Points to Know-
When the molten magma cools, it becomes solid and rocks thus formed are called igneous rocks. They are also called primary rocks.
There are two types of igneous rocks:
• Extrusive rocks
• Intrusive rocks
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17
Among the following rocks, Deccan plateau is made up of
A. Granite
B. Sandstone
C. Slate
D. Basalt
Answer - D
Solution
Points to Know-
Basalt is extrusive igneous rock
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18
What is true regarding Intrusive rocks?
i. They have a very fine-grained structure
ii. They are formed when molten magma cools down inside the Earth’s crust.
A. Only i
B. Only ii
C. Both i and ii
D. None of these
Answer - B
Solution
Points to Know-
There are two types of igneous rocks:
• Extrusive rocks
• Intrusive rocks
Extrusive rocks- When the molten lava comes on the earth’s surface and cools down and becomes solid and rocks thus formed are extrusive igneous rocks. They have a very fine-grained structure. Example– basalt
Intrusive rocks-When the molten magma cools down deep inside the earth’s crust. Solid rocks so formed are called intrusive igneous rocks. Since they cool down slowly they form large grains. Example – Granite
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19
Sandstone is an example of-
A. Intrusive igneous rocks
B. Extrusive Igneous rocks
C. Sedimentary rocks
D. Metamorphic rocks
Answer - C
Solution
Points to Know-
The loose sediments are compressed and hardened to form layers of rocks. These types of rocks are called sedimentary rocks. Example- Sandstone
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20
Which of the following is true about rocks?
i. One type of rock changes to another type under certain conditions in cyclic manner
ii. Sedimentary rocks are changed into Metamorphic rocks under great heat and pressure
A. Only i
B. Only ii
C. Both i and ii
D. None of these
Answer - C
Solution
Points to Know-
• One type of rock changes to another type under certain conditions in a cyclic manner. This process of transformation of the rock from one to another is known as the rock cycle.
• When the igneous and sedimentary rocks are subjected to heat and pressure they change into metamorphic rocks.
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