📘 Class 7 Social Science (Geography) – Chapter 2: Inside Our Earth
🌍 MCQ Questions with Answers (Full 50 Questions in English)
This chapter explains the structure of the Earth, types of rocks, minerals, and the formation of soil.
Let’s go through everything step by step 👇
🧠 Multiple Choice Questions (MCQs) with Answers
1️⃣ The uppermost layer of the Earth is called —
(a) Mantle
(b) Crust
(c) Core
(d) Outer core
👉 Answer: (b) Crust
2️⃣ The middle layer of the Earth is —
(a) Crust
(b) Mantle
(c) Core
(d) Lithosphere
👉 Answer: (b) Mantle
3️⃣ The innermost layer of the Earth is —
(a) Core
(b) Mantle
(c) Crust
(d) Lithosphere
👉 Answer: (a) Core
4️⃣ The crust is made up of —
(a) Iron and Nickel
(b) Silica and Aluminium
(c) Carbon and Nitrogen
(d) Zinc and Copper
👉 Answer: (b) Silica and Aluminium
5️⃣ The mantle is mainly made up of —
(a) Iron
(b) Nickel
(c) Silica and Magnesium
(d) Silica and Aluminium
👉 Answer: (c) Silica and Magnesium
6️⃣ The core is rich in —
(a) Iron and Nickel
(b) Aluminium and Magnesium
(c) Copper and Zinc
(d) Gold and Silver
👉 Answer: (a) Iron and Nickel
7️⃣ The radius of the Earth is about —
(a) 3500 km
(b) 6400 km
(c) 4800 km
(d) 8000 km
👉 Answer: (b) 6400 km
8️⃣ The crust is about how thick under continents?
(a) 5 km
(b) 35 km
(c) 70 km
(d) 100 km
👉 Answer: (b) 35 km
9️⃣ The crust under the ocean is —
(a) Thicker
(b) Thinner
(c) Equal
(d) Absent
👉 Answer: (b) Thinner
10️⃣ The word “Igneous” means —
(a) Fire
(b) Air
(c) Water
(d) Stone
👉 Answer: (a) Fire
11️⃣ Igneous rocks are formed by —
(a) Cooling of molten magma
(b) Sediment deposition
(c) Heat and pressure
(d) Weathering
👉 Answer: (a) Cooling of molten magma
12️⃣ Igneous rocks are also called —
(a) Primary rocks
(b) Secondary rocks
(c) Tertiary rocks
(d) Fossil rocks
👉 Answer: (a) Primary rocks
13️⃣ The molten material found inside the Earth is called —
(a) Magma
(b) Lava
(c) Rock
(d) Soil
👉 Answer: (a) Magma
14️⃣ When magma comes out and cools on the surface, it forms —
(a) Extrusive igneous rocks
(b) Intrusive igneous rocks
(c) Sedimentary rocks
(d) Metamorphic rocks
👉 Answer: (a) Extrusive igneous rocks
15️⃣ When magma cools deep inside the Earth, it forms —
(a) Extrusive rocks
(b) Intrusive igneous rocks
(c) Sedimentary rocks
(d) Fossils
👉 Answer: (b) Intrusive igneous rocks
16️⃣ Basalt is an example of —
(a) Extrusive igneous rock
(b) Intrusive igneous rock
(c) Sedimentary rock
(d) Metamorphic rock
👉 Answer: (a) Extrusive igneous rock
17️⃣ Granite is an example of —
(a) Extrusive igneous rock
(b) Intrusive igneous rock
(c) Sedimentary rock
(d) Metamorphic rock
👉 Answer: (b) Intrusive igneous rock
18️⃣ Rocks are made up of —
(a) Minerals
(b) Soil
(c) Plants
(d) Water
👉 Answer: (a) Minerals
19️⃣ The process of breaking down of rocks into smaller pieces is called —
(a) Erosion
(b) Weathering
(c) Deposition
(d) Melting
👉 Answer: (b) Weathering
20️⃣ Sedimentary rocks are formed by —
(a) Cooling of magma
(b) Compression of sediments
(c) Melting
(d) Heat and pressure
👉 Answer: (b) Compression of sediments
21️⃣ Sediments are carried and deposited by —
(a) Wind
(b) Water
(c) Ice
(d) All of these
👉 Answer: (d) All of these
22️⃣ Layers of sediments form —
(a) Sedimentary rocks
(b) Igneous rocks
(c) Metamorphic rocks
(d) Crystals
👉 Answer: (a) Sedimentary rocks
23️⃣ Fossils are found in —
(a) Igneous rocks
(b) Sedimentary rocks
(c) Metamorphic rocks
(d) All types of rocks
👉 Answer: (b) Sedimentary rocks
24️⃣ Metamorphic rocks are formed from —
(a) Igneous or sedimentary rocks changed by heat and pressure
(b) Cooling magma
(c) Lava
(d) Erosion
👉 Answer: (a) Igneous or sedimentary rocks changed by heat and pressure
25️⃣ Which of the following is a metamorphic rock?
(a) Marble
(b) Basalt
(c) Sandstone
(d) Shale
👉 Answer: (a) Marble
26️⃣ Slate is formed from —
(a) Limestone
(b) Shale
(c) Sandstone
(d) Granite
👉 Answer: (b) Shale
27️⃣ Marble is formed from —
(a) Limestone
(b) Shale
(c) Sandstone
(d) Coal
👉 Answer: (a) Limestone
28️⃣ The rock cycle shows —
(a) Interrelationship among different rocks
(b) One rock changes into another
(c) Continuous process
(d) All of these
👉 Answer: (d) All of these
29️⃣ The process of changing one type of rock into another is called —
(a) Rock cycle
(b) Erosion
(c) Weathering
(d) Formation
👉 Answer: (a) Rock cycle
30️⃣ Rocks which contain minerals in large quantity are called —
(a) Ores
(b) Fossils
(c) Soil
(d) Stones
👉 Answer: (a) Ores
31️⃣ Which rock contains fossil fuels like coal and petroleum?
(a) Sedimentary
(b) Igneous
(c) Metamorphic
(d) None
👉 Answer: (a) Sedimentary
32️⃣ Which rock is used for making statues and buildings?
(a) Marble
(b) Basalt
(c) Shale
(d) Coal
👉 Answer: (a) Marble
33️⃣ Which rock is used in grinding stones and building materials?
(a) Granite
(b) Limestone
(c) Basalt
(d) Sandstone
👉 Answer: (d) Sandstone
34️⃣ Rocks are of how many main types?
(a) Two
(b) Three
(c) Four
(d) Five
👉 Answer: (b) Three
35️⃣ Which of the following is not a type of rock?
(a) Igneous
(b) Sedimentary
(c) Magnetic
(d) Metamorphic
👉 Answer: (c) Magnetic
36️⃣ The study of rocks is called —
(a) Petrology
(b) Geology
(c) Ecology
(d) Biology
👉 Answer: (a) Petrology
37️⃣ The crust forms what percentage of the Earth’s volume?
(a) 1%
(b) 10%
(c) 30%
(d) 50%
👉 Answer: (a) 1%
38️⃣ The crust forms what percentage of the Earth’s mass?
(a) 1%
(b) 15%
(c) 83%
(d) 50%
👉 Answer: (a) 1%
39️⃣ The mantle forms what percentage of the Earth’s volume?
(a) 83%
(b) 50%
(c) 30%
(d) 10%
👉 Answer: (a) 83%
40️⃣ The core forms what percentage of the Earth’s volume?
(a) 16%
(b) 50%
(c) 70%
(d) 80%
👉 Answer: (a) 16%
41️⃣ The inner core is —
(a) Solid
(b) Liquid
(c) Gas
(d) Partially solid
👉 Answer: (a) Solid
42️⃣ The outer core is —
(a) Solid
(b) Liquid
(c) Gas
(d) Empty
👉 Answer: (b) Liquid
43️⃣ Which rock is also known as volcanic rock?
(a) Igneous rock
(b) Sedimentary rock
(c) Metamorphic rock
(d) None
👉 Answer: (a) Igneous rock
44️⃣ The word “metamorphic” means —
(a) Change of form
(b) Fire
(c) Layered
(d) Soft
👉 Answer: (a) Change of form
45️⃣ Limestone changes into —
(a) Marble
(b) Slate
(c) Granite
(d) Basalt
👉 Answer: (a) Marble
46️⃣ Shale changes into —
(a) Slate
(b) Marble
(c) Basalt
(d) Sandstone
👉 Answer: (a) Slate
47️⃣ Sandstone changes into —
(a) Quartzite
(b) Marble
(c) Shale
(d) Granite
👉 Answer: (a) Quartzite
48️⃣ Rocks that form due to deposition of layers are —
(a) Sedimentary rocks
(b) Igneous rocks
(c) Metamorphic rocks
(d) None
👉 Answer: (a) Sedimentary rocks
49️⃣ Which of these is not an example of metamorphic rock?
(a) Marble
(b) Slate
(c) Basalt
(d) Quartzite
👉 Answer: (c) Basalt
50️⃣ Rocks are important because —
(a) They give us minerals and building materials
(b) They form soil
(c) They provide fuel sources
(d) All of these
👉 Answer: (d) All of these
📘 Quick Revision Summary
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🌍 Three Layers of Earth:
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Crust: Outer, solid layer (Silica + Aluminium)
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Mantle: Middle layer (Silica + Magnesium)
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Core: Inner layer (Iron + Nickel)
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🪨 Types of Rocks:
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Igneous: Formed from magma (Basalt, Granite)
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Sedimentary: Formed from layers of sediments (Sandstone, Shale, Limestone)
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Metamorphic: Changed form due to heat & pressure (Marble, Slate, Quartzite)
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🔄 Rock Cycle:
Rocks continuously change from one type to another. -
💎 Importance of Rocks:
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Source of minerals and fuels
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Basis for soil formation
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Building material
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