Thursday, October 14, 2021

CLASS-6 Subject-Social Studies History CHAPTER-4 IN THE EARLIEST CITIES,

 EVENTS CONVENT HIGH SCHOOL

14/10/2021      CLASS-6     SESSION 2021-22
SUBJECT :SOCIAL SCIENCE HISTORY

chapter - 4
IN THE EARLIEST CITIES

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I. Multiple Choice Questions

Choose the correct option to complete the statements given below:

(i) The Great Bath has been discovered in ……………….
(a) Lothal
(b) Harappa
(c) Mohenjodaro
(d) Kalibangan.

(ii) Most cities had the western part ………… and …………..
(a) smaller, higher
(b) smaller, lower
(c) larger, higher
(d) larger, lower.

(iii) Which of these groups of people did not usually live in cities, but the countryside?
(a) rulers
(b) craftspersons
(c) farmers and herders
(d)   scribes

(iv) The alloy of tin and ………….  is called bronze.
(a) zinc
(b) copper
(c) gold
(d) platinum.

(v) The city of Lothal was situated beside a river which was a tributary of
(a) Ganga
(b) Sabarmati
(c) Narmada
(d) Kaveri.

(vi) What caused the end of Harappan civilization?
(a) Deforestation
(b) Rulers lost control
(c) Flooding
(d) Reasons unknown to us; but probably those listed in the other three options.

Answer:
(i) – (c), (ii) – (a), (iii) – (c), (iv) – (b), (v) – (b), (vi) – (d).

II. Fill in the Blanks

Fill in the blanks with appropriate words to complete each sentence:

  1. The western part of Harappan cities, which was usually smaller but higher, has been referred to as the ……………..
  2. The eastern part of Harappan cities, which was usually larger but lower, has been referred to as the ……………
  3. The Great Bath was made water tight with a layer of………………….
  4. Scribes were people who knew how to ………………
  5. Metals like gold and silver were used to make ……………  and ………….

Answer:

  1. Citadel
  2. lower town
  3. natural tar
  4. write
  5. ornaments, vessels

III. True/False

State whether these sentences are true (T) or false (F).

  1. The bricks in Harappa were laid in an interlocking pattern and that made the walls strong.
  2. Usually, the special buildings were created in the lower town.
  3. The houses of Harappa were poorly built.
  4. Harappan seals were made of metal
  5. People knew about cotton much before Harappa.

Answer:

  1. T
  2. F
  3. F
  4. F
  5. T.

IV. Matching Skill
Match the items in column A correctly with those given in column B.
NCERT Solutions for Class 6 Social Science History Chapter 4 In the Earliest Cities Matching Skills

V. Very Short Answer Type Questions

1. When and how was the site of Harappa first encountered? [Imp.]
Answer:  Around a hundred and fifty years ago, when railway lines were being laid in Punjab, engineers stumbled upon the site of Harappa.

2. How old are Harappa cities believed to be?
Answer: Harappa and other such cities are believed to have developed 4700 years ago.

3. What was the citadel?
Answer: The western part of most cities was smaller but higher, described as ‘citadel’ by archaeologists.

4. Give some important features of the Great Bath. [V. Imp.]
Answer: The Great Bath was lined with bricks, Coated with plaster, and made water tight with natural tar.

5. Name two cities which had fire altars.
Answer:  Lothal and Kalibangan were cities with fire altars.

V.Short Answer Type Questions 

1. Describe the two parts of a typical Harappan city. [V. Imp.]
Answer: A Harappan city was usually divided into two or more parts. The part to the west was smaller but higher. It is called ‘citadel’. The part to the east was larger but-lower. Archaeologists call it the lower town.

2. How were bricks laid in houses of Harappan cities?
Answer: Bricks were so well made that they have lasted for thousand of years. They were laid in an interlocking pattern and this made the walls strong. Many of these bricks were taken away by engineers about a hundred and fifty years ago.

3. Describe the drains of the cities.   [V. Imp.]
Answer: Most cities had covered drains. They were laid out carefully in straight lines. Each drain had a gentle slope. Thus, water could flow easily through it. Drains in houses were connected to those on the streets and smaller drains led to bigger ones.

4. Write a short note on the craft practised by Harappan.
Answer: Harappan objects were made of stone, shell and metal. Copper and bronze were used to make tools, weapons, ornaments and vessels. Gold and silver were used to make ornaments and vessels. Harappans also made stone seals. They made pots with beautiful black designs.

5. Where did the Harappan get the raw materials from?
Answer: The Harappans got the raw materials from various places. They got copper probably from present-day Rajasthan, and also from Oman. Tin was brought from Afghanistan and Iran. Gold was brought may be from Karnataka. Precious stones were brought from Gujarat, Iran and Afghanistan.

6. Why were metals, writing, the wheel and the plough important for the Harappans?
Answer: 

  1. Metals: The Harappan made copper tools. They also made ornaments of gold and silver.
  2. Writing: Writing was very important for the Harappans. There were scribes, people who knew how to write. Scribes helped prepare the seals and perhaps wrote on other materials that have not survived.
  3. Wheel: The Harappans used the wheel in carts. They also used the wheel in spinning. The wheel was used by potters to make or shape pots and other things.
  4. Plough: Plough was used to prepare the land for farming by the Harappans.

Wednesday, October 13, 2021

CLASS-8 SUBJECT SOCIAL SCIENCE GEOGRAPHY (CHAPTER-3) MINERAL AND POWER RESOURCES

 EVENTS CONVENT HIGH SCHOOL

13/10/2021      CLASS-8     SESSION 2021-22
SUBJECT :SOCIAL SCIENCE

chapter - 3
MINERAL AND POWER RESOURCES

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Question 1.Choose the correct option.
(i) Which of these is a non-metallic mineral?
(a) Iron ore
(b) Bauxite
(c) Limestone
(d) Manganese ore

(ii) Which continent produces more than half of the world’s tin?
(a) Africa
(b) Asia
(c) Europe
(d) South America

(iii) Which continent is the leading producer of iron ore in the world?
(a) North America
(b) Asia
(c) Europe
(d) Australia

(iv) Which state is a major bauxite producing area?
(a) Goa
(b) Madhya Pradesh
(c) Assam
(d) Tamil Nadu

(v) What is the name given to the electricity produced from coal?
(a) Nuclear power
(b) Thermal power
(c) Fossil fuel
(d) None of these

(vi) Which of these is a conventional source?
(a) Coal
(b) Petroleum
(c) Natural gas
(d) All of these

(vii) Which of these is called buried sunshine?
(a) Petroleum
(b) Coal
(c) Solar energy
(d) Tidal energy

Answer:
(i) (c), (ii) (b), (iii) (c), (iv) (b), (v) (b), (vi) (d), (vii) (b).

Question 2.Fill in the blank spaces given to complete each sentence.

  1. Metallic minerals are classified into …………….. and ………….
  2. Gold and silver are …………. minerals.
  3. Minerals can be extracted by ………….,…………., or …………
  4. Deep bores dug to reach mineral deposits are called …………
  5. Metallic minerals are generally found in ……….. and…………..rock formations.
  6. The mineral deposits in North America have located in three zones: …………… the Appalachian region and the mountain ranges of the West.
  7. …………… is the largest producer of bauxite in the world.
  8. …………. is the most abundantly available fossil fuel.
  9. Petroleum is drilled from ………
  10. Bhakra Nangal is an important …………….. station in India.
  11. …………… and……… are radioactive metals.

Answer:

  1. ferrous, non-ferrous
  2. non-ferrous
  3. mining, drilling, quarrying
  4. shafts
  5. igneous, metamorphic
  6. the Canadian region north of the Great Lakes
  7. Australia
  8. Coal
  9. Oil fields
  10. hydel power
  11. Uranium, thorium.

Question 3.State whether each of the following statements is true (T) or false (F).

  1. All ores are rocks but all rocks are not minerals.
  2. Quarrying is good for the environment.
  3. Mineral fuels like coal and petroleum are found in sedimentary strata.
  4. Coal is more predominant in the Canadian Shield Region than the Appalachians.
  5. Chile and Peru are leading producers of copper.
  6. Kolar in Karnataka has large deposits of silver.
  7. Copper is an element used in almost everything.
  8. Bauxite is the ore of aluminium.
  9. Nuclear power can be produced from the nuclei of most elements.

Answer:

  1. Ture
  2. False
  3. Ture
  4. False
  5. True
  6. False
  7. True
  8. True
  9. False

Question 4. Match the items given in Column I correctly with those given in Column II.
NCERT Solutions for Class 8 Social Science Geography Chapter 3 Minerals and Power Resources Exercise Questions Q4
Answer:
(i) (d), (ii) (a), (iii) (b), (iv) (c), (v) (e).


 Very Short Answer Type Questions

Question 1.
Differentiate between a rock and an ore.
Answer:
A rock is an aggregate of one or more minerals. An ore is a rock from which minerals are mined.

Question 2.
Define quarrying.
Answer:
Quarrying is a process of extraction in which minerals lying near the surface are simply dugout.

Question 3.
Name the leading tin producers in Asia.
Answer:
China, Malaysia, and Indonesia are leading tin producers in Asia.

Question 4.
Name two areas in Australia, which have large deposits of gold.
Answer:
Two areas in Western Australia having large deposits of gold are Kalgoorlie and Coolgardie.

Question 5.
Name two minerals in whose production India contributes a significant part.
Answer:
India has vast deposits of high-grade iron ore, and it is also a leading producer of salt.

Question 6.
In which industry is silicon important? From which ore is it obtained?
Answer:
Silicon is important in the computer industry. It is obtained from quartz.

Short Answer Type Questions

Question 1.
Name and describe briefly methods of extraction.
Answer:
Mining, drilling, and quarrying are methods of extraction. Mining is a process of extraction of taking out minerals from rocks under the earth’s surface.

  1. Opencast mining: In this, minerals lying at shallow depths are taken out by removing the surface layer.
  2. Shaft mining: In this, deep bores (called shafts) are made to reach mineral deposits lying at large depths.
  3. Drilling: In this, deep wells are bored to take out minerals.
  4. Quarrying: It is the process of extraction in which minerals lying very close to the surface are extracted just by digging them out.

Question 2.
Where are minerals found?
Answer:
Minerals are found in different types of rocks. Metallic minerals are usually found in igneous and metamorphic rocks that form large plateaus. Examples: iron ore is found in north Sweden, copper, and nickel in Canada. In igneous and metamorphic rocks in South Africa, iron, nickel, chromites, and platinum are found. Non-metallic minerals are found in sedimentary rock formations. Limestone deposits are found in France. Mineral fuels such as coal and petroleum are found in sedimentary strata.

Question 3.
Describe the mineral distribution in North America.
Answer:
The mineral deposits in North America are found in three zones: the Canadian region in the north of the Great Lakes, the Appalachian region, and the Rocky Mountains in the West. Iron ore, nickel, gold, uranium, and copper are mined in the Canadian Shield Region, coal in the Appalachian region. Western Cordilleras have vast deposits of copper, lead, zinc, gold, and silver.

Question 4.
Write common uses of minerals.
Answer:
Minerals are important in many industries. Minerals used in gems are usually very hard. These are then set in varying styles of jewellery. Iron and copper are metals used in almost everything. Copper is present in everything from coins to pipes and electricity wires. Silicon, obtained from the mineral quartz, is the base of the computer industry. Aluminium, obtained from bauxite ore, and its alloys are used in aeroplanes due to their lightweight. Aluminium is also used in kitchen cookware.

Question 5.
How is hydroelectricity, produced?
Answer:
Hydroelectricity is produced from the energy possessed by water falling from great heights. River water is stored in dams. When rainwater or river waterfalls from heights, it flows over turbine blades placed at the bottom of the dam. The moving blades are connected to a generator which produces electricity from this energy. This electricity is called hydroelectricity. The water discharged after its production is used for irrigation.

Question 4.
Distinguish between the following.
(i) Conventional and non-conventional sources of energy.
(ii) Biogas and natural gas.
(iii) Ferrous and non-ferrous minerals
(iv) Metallic and non-metallic minerals.
Answer:
(i)
NCERT Solutions for Class 8 Social Science Geography Chapter 3 Minerals and Power Resources Q4

NCERT Solutions for Class 8 Social Science Geography Chapter 3 Minerals and Power Resources Q4.1

NCERT Solutions for Class 8 Social Science Geography Chapter 3 Minerals and Power Resources Q4.2

NCERT Solutions for Class 8 Social Science Geography Chapter 3 Minerals and Power Resources Q4.3

Tuesday, October 12, 2021

Class-8 Subject Science Chapter-16 LIGHTS

 EVENTS CONVENT HIGH SCHOOL

12/10/2021      CLASS-8     SESSION 2021-22
SUBJECT : SCIENCE

chapter - 16
lIGHTS 

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Textbook Questions

Question 1.Suppose you are in a dark room. Can you see objects in the room? Can you see objects out¬side the room? Explain.
Answer:
When we are in a dark room then we cannot see objects in the room. We can see the objects outside the room, because out of the room the light is available and the rays of light can enter our eyes after reflection from the objects.

Question 2.Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
Answer:

Regular ReflectionDiffused Reflection
(i) All the reflected rays are parallel.(i) The reflected rays are not parallel.
(ii) It occurs on a smooth and polished surface.(ii) It occurs on the rough surface.
(iii) Reflected rays are in one direction.(iii) Reflected rays are scattered in different directions.

No, diffuse reflection doesn’t mean the failure of laws of reflection.

Question 3.
Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.

  1. Polished wooden table
  2. Chalk powder
  3. Cardboard surface
  4. Marble floor with water spread over it
  5. Mirror
  6. Piece of paper

Answer:

  1. Regular reflection will take place because the surface is plane and polished.
  2. Diffused reflection will take place because the surface is rough.
  3. Diffused reflection will take place because the surface is rough.
  4. Regular reflection will take place because the surface is smooth and plane.
  5. Regular reflection will take place because the surface is plane and polished.
  6. Diffused reflection will take place because the surface is rough.

Question 4.State the laws of reflection.
Answer:
The laws of reflections are:

  • The incident ray, the normal and the reflected ray, all lie in the same plane.
  • The angle of incidence is equal to the angle of reflection.

Question 5 Fill in the blanks in the following.
(a) A person 1 m in front of a plane mirror seems to be ______ m away from his image.
(b) If you touch your ______ ear with a right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with _____
(c) The size of the pupil becomes _______ when you see in dim light.
(d) Night birds have _______ cones than rods in their eyes.
Answer:
(a) 2
(b) left, left hand
(c) larger
(d) lesser

Question.6 Choose the correct option in Questions 
1.The angle of incidence is equal to the angle of reflection
(a) Always
(b) Sometimes
(c) Under special conditions
(d) Never
Answer:
(a) Always


2. Image formed by a plane mirror is:
(a) virtual, behind the mirror and enlarged.
(b) virtual, behind the mirror and of the same size as the object.
(c) real at the surface of the mirror and enlarged.
(d) real, behind the mirror and of the same size as the object.
Answer:
(b) virtual, behind the mirror and of the same size as the object.