7th Standard CBSE Social Science Inside Our Earth Model Question Paper | QB365

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7th Standard CBSE Social Science Inside Our Earth Model Question Paper

Published on: 17/08/2019

Inside Our Earth

Download CBSE Class 7th Standard CBSE Social Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 7th Standard CBSE Social Science

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Std: 7th Standard CBSE - Social Science

chapter: - Model Question paper

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Questions:

Generic 3

4 x 3 = 12

Differentiate between crust and core

Differentiate between igneous and metamorphic rocks

What are the uses of rocks?

What is a rock?

Multiple Choice Question

5 x 1 = 5

Radius of the earth is :

(a)

2,500 km

(b)

367km

(c)

7,163km

(d)

6,371km

The Deccan plateau is made up of

(a)

granite

(b)

clay

(c)

basalt

(d)

Both (a) and (c)

Granite is an example of

(a)

extrusive igneous rocks

(b)

intrusive igneous rocks

(c)

sedimentary rocks

(d)

igneous rocks

Rocks which contain fossils are

(a)

sedimentary rocks

(b)

metamorphic rocks

(c)

igneous rocks

The rock which is made up of molten magma is

(a)

igneous

(b)

sedimentary

(c)

metamorphic

Match the following

5 x 1 = 5

10.

SiAl

11.

Remain of dead plants and animals trapped in layer of rocks.

12.

Clay

13.

Rocks

14.

Core

Generic 5

2 x 5 = 10

15.

Observe the given picture carefully and answer the questions that follow
(a) What is the uppermost layer of the Earth?
(b) What is the mineral constituent of the oceanic crust?
(c) What is the innermost layer of the Earth?

16.

Explain basic features of the interior of the earth.

Fill up / 1 Marks

5 x 1 = 5

17.

_____________and___________rocks changes into __________rocks due to excessive heat and pressure.

18.

The deepest mine in the world is in_____________

19.

Like an___________ the earth is made up of ________layers.

20.

The Taj Mahal is made of...........

21.

Igneous and sedimentary rocks can change into ..... rocks.

True or False

3 x 1 = 3

22.

The innermost layer has a radius of about 1500 km

(a)

True

(b)

False

23.

Core has very high temperature and pressure.

(a)

False

(b)

True

24.

Rocks are used in medicine

(a)

False

(b)

True

1 Marks

6 x 1 = 6

25.

What is rock cycle?

26.

What do you mean by fossils?

27.

What are sediments?

28.

What are fossils?

29.

What is the Earth's crust made up of?

30.

What is the uppermost layer of the Earth known as?

Generic 2

1 x 2 = 2

31.

For fun-What are the minerals most commonly used in the following objects?

Generic 4

2 x 4 = 8

32.

Explain the rock cycle with the help of a diagram.

33.

Describe the interior of the earth

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Answers Key:

Generic 3

4 x 3 = 12

Differences between crust and core are

Crust	Core
It is the uppermost layer of the Earth's surface.	It is the innermost layer of the Earth's surface.
The main mineral constituents are silica and alumina i.e. SiAl.	The main mineral constituents are nickel and ferrous i.e. NiFe.

The differences between igneous and metamorphic rocks are as follow

Igneous rocks	Metamorphic rocks
They are formed, when the molten magma cools and becomes solid.	They are formed due to great heat and pressure over igneous and sedimentary rocks.
For example, basalt, granite.	For example, clay changes into slate and limestone into marble.

Rocks are very useful to us. The hard rocks are used for making roads, houses and buildings.

Any natural mass of mineral matter that makes up the Earth's crust is called a rock

Multiple Choice Question

5 x 1 = 5

(d)
6,371km

(b)
intrusive igneous rocks

(b)
metamorphic rocks

(a)
igneous

Match the following

5 x 1 = 5

10.

()
Silica and Alumina

11.

()
Fossils

12.

()
Changes into slate

13.

()
Used for roads and buildings

14.

()
Innermostlayer

Generic 5

2 x 5 = 10

15.

(a) Crust.
(b) Silica and Magnesium (SiMa).
(c) Core is the innermost layer of the Earth

16.

The earth is made up of several concentric layers with one inside another just like an onion. The basic features of the interior of the earth are
(i) Crust It is the uppermost layer over the earth's surface which is the thinnest of all the layers. It is about 35 km on the continental masses and only 5 km on the ocean floors. The continental mass are made up of silica and alumina. It is thus called SiAl (Si-Silica and AI-Alumina). The oceanic crust mainly consists of Silica and Magnesium; it is therefore called SiMa (Si-Silica and Ma-Magnesium.
(ii) Mantle It is just beneath the crust which extends up to a depth of 2900 km below the crust.
(iii) Core The innermost layer is the core with a radius of about 3500 km. It is mainly made up of Nickel and Iron and is called NiFe (Ni-Nickel and Fe-Ferrous i.e. iron). The central core has very high temperature and pressure.

Fill up / 1 Marks

5 x 1 = 5

17.

()
Igneous, sedimentary, metamorphic

18.

()
South Africa

19.

()
onion, several concentric

20.

()
white marble

21.

()
metamorphic

True or False

3 x 1 = 3

22.

(b)
False

23.

(a)
False

24.

(a)
False

1 Marks

6 x 1 = 6

25.

()
The process of transformation of the rock from one to another is known as the rock cycle.

26.

()
The remains of the dead plants and animals trapped in the layers of rocks are called fossils

27.

()
When rocks roll down, crack and hit each other and are broken down into small fragments. These smaller particles are called sediments.

28.

()
The remains of the dead plants and animals trapped in the layers of rocks are called fossils.

29.

()
The Earth's crust is made of different types of rocks.

30.

()
The uppermost layer of the Earth is called crust.

Generic 2

1 x 2 = 2

31.

Iron, Brass, Gold, Copper, Zinc, Silver.

Generic 4

2 x 4 = 8

32.

Rocks are constantly being formed, worn down and then formed again. It takes thousands and millions of years for rocks to change. This process of transformation of the rock from one form to another is called rock cycles.

(i) When the molten magma cools down, it solidifies to become igneous rocks.
(ii) These igneous rocks are broken down into small particles, known as sediments.
(iii) These sediments are transported and deposited to form sedimentary rocks.
(iv) When these igneous and sedimentary rocks are subjected to heat and pressure, they change into metamorphic rocks.
(v) The metamorphic rocks which are still under heat and pressure, melt down to form molten magma, which again cools and solidifies into igneous rocks.

33.

The earth is made up of several concentric layers with one inside another.
There are three main layers are Crust, Mantle, and Core
(i) Crust: It is the uppermost layer over the earth's surface and thinnest among all layer The continental mass of the crust consisting of silica and alumina, thus it is called sial (si- silica and al-alumina). The oceanic crust consist of silica and magnesium, thus called sima (si-silica, ma-magnesium). It is about 35 km thick on the continental masses and only 5 km thick on the oceans floors.
(ii) Mantle: It is just beneath the crust, with a depth of 2,900kms.
(iii)Core: It is the innermost layer of the earth, mainly made up of nickel and ferrous. The central core has very high temperature and pressure.