Class-8 Social Science civic Chapter-21 India and the United Nations

 EVENTS CONVENT H. SCHOOL

23/02/2021         Class-8                 SLOT-2
SOCIAL SCIENCE(civic)
Chapter-21
INDIA AND THE UNITED NATIONS

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 1.     Choose the correct option of the following questions

 Question 1.When UN was established?

(a) 24 October 1945 (√)

(b) 10 December 1945

(c) 1 May 1945

(d) 3 December 1950

 

Question 2.Which countries are permanent members of UN Security Council?

(a) US, Russia, France, Britain and China (√)

(b) Russia, France, India, China and Pakistan

(c) Saudi Arab, Bangladesh, Britain, US and Russia

(d) Britain, India, China, France and U.S

 

2.     Fill in the blanks:

1.The Headquarter of UN are in New York

2.At present total number of members in UN 191

 

3.     Very Short Answer Type Questions

Question 1.Who elects the Non-Permanent members of UN Security Council?

Answer:The Security Council is the important organ of the United Nations. It after the Security and peace in the World. It 15 members, out of them 5 are permanent members and 10 are non-permanent. These N Permanent members are elected by the General Assembly for a duration of two years.

Question 2.What is the International Court Justice?

Answer:The International Court of Justice consists of 15 judges for a period of 9 years, retiring every 5 years. The court decided disappoint among its member nations. It gives advice the different organs of the United Nations.

 Question 3.By which name the administration officer UN is known?

Answer:Administrative head of UN is known as the Secretary General.

 

4.     Short Answer Type Questions

Question 1.What are the works of UNICEF?

Answer:The main function of UNICEF, provide help to children in need regardless their race and religion. It works in the field health, nutrition and education.

 

Question 2.Write two objectives of UN?

Answer:Two objectives of UN are:

To maintain international peace security to do joint effort to clearly hurdles in the way of peace.

To co-operate in solving international problems of an economic social cultural or humanitarian character in promoting respect for human and fundamental freedom for all.

Question 3.Write the names of the major of UN?

Answer:There are six organs of the United Nations:

The General Assembly.

The Security Council.

The Economic and Social Council.

The Trusteeship Council.

The International Court of Justice, and

The Secretariat.

 

5.     Long Answer Type Questions

Question 1.What efforts have been taken up by UN for world peace?

Answer:The major objective of the United Nations is to maintain peace in the world. During its existence of more than sixty years the United Nations has been called upon to take action in several disputes. The United Nations was helpful in avoiding several wars.

 

It reduced tension in many critical situation. UN operated peacekeeping operations by sending peace keeping forces. By sending goodwill mission UN has been successful to reduce tension between tense countries It prevented large scale wars in Kashmir. Congo, West Asia, Cyprus, Yaman etc. ts peace-keeping efforts in Greece, Indonesia, Lebanon, Egypt, Gaza Strip, Congo, Korea, Iran, Iraq are some of its significant achievements.

 

Question 2.Mention India’s role in UN?

Answer:India is one of the founder members f the United Nations. It has made significant contribution in making the United Nations more meaningful. It is participated in peace-keeping mission whenever required. It has always committed to the principals and working of the United Nations.

India greatly participated in the administration of two most worst systems of partheid and colonialism with the United nations and got success. Apart from this, it undertook various peace-keeping mission in various countries in establishing peace, and maintaining human rights. It also advocated of inducing more and more countries to make it unable. It is India’s effort that made the inclusion

Class-8 Science Chapter-18 Pollution of Air and Water

EVENTS CONVENT H. SCHOOL

23/02/2021          Class-8                 SLOT-2
SCIENCE
Chapter-18
POLLUTION OF AIR AND WATER
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A. Short Answer Type Questions

 Question 1.What are the different sources responsible for the depletion of atmospheric oxygen?

Answer:The sources are:

Burning of fuel which consume oxygen gas.

Excessive use of various pesticides like DDT.

 

Question 2.What was the aim of the Ganga Action Plan?

Answer:Its aim was to reduce the pollution level in the Ganga river.

 

Question 3.How would the disposal of garbage, etc., affect the living organisms in the river?

Answer:Disposal of garbage into the rivers pollute the river water. When garbage rots, it produces poisonous and toxic gases so that living organisms cannot breathe and die ultimately.

 

Question 4.What will happen if we drink polluted water?

Answer:If we drink polluted water, we may suffer from the water borne diseases such as jaundice, dysentery, hepatitis, cholera, etc.

 

Question 5.How can water be made fit for drinking?

Answer:Drinking water can be boiled before drinking. It kills the harmful bacteria present in it.

It can also be. purified by adding potassium permanganate (Lai Dawai) or bleaching powder.

In cities alum and chlorine gas is added to purify water.

 

B. Long Answer Type Questions

 

Question 6.What is atmosphere?

Answer:The atmosphere is the protective blanket of gases surrounding the earth. It is a mixture of gases. The composition is very important for the survival of living things on the earth. The atmosphere contains N2, O2, CO2, noble gases, water vapour and dust particles. The composition of atmosphere depends upon place, season and altitude, etc.

 

Question 7.What are the major pollutants of air? Name these.

Answer:The major air pollutants are:

Carbon monoxide (CO)

Carbon dioxide (CO2)

Suspended Particulate Matter (SPM)

Chlorofluorocarbons (CFCs)

 

Question 8.What is global warming? How is it caused?

Answer:Increasing temperature of the earth is called global warming. The radiation of the sun, reaching the earth is not being consumed. This is due to the deforestation. The level of CO2 has increased and thus global warming has also increased. CO2 is absorbed by the plants for photosynthesis. So reduced number of plants increases the amount of carbon dioxide in the environment. This cuases accumulation of carbondioxide and increases temperature.

Question 9.What are the different ways in which water gets contaminated?

Answer:Different ways of water contamination:

Discharge or dumping of domestic wastes and sewage into water bodies.

Surface runoff by water after rains.

Faulty drainage system.

Discharge from chemical factories directly into the river.

Discharge from laboratories and hospitals into the river.

Disposal of dead bodies of animals and human beings into the rivers.

 

Question 10.At an individual level, how can you help to reduce air pollution?

Answer:Air pollution can be reduced by

planting more and more trees.

using smokeless stoves and LPG.

using smokeless fuel like CNG in vehicles.

avoiding the use of fossil fuels like coal and petroleum.

saying ‘No’ to plastic bags.

avoiding smoking.

not burning dry leaves etc., but putting them in compost pits to make manure.

 

Question 11.Explain the differences between pure air and polluted air.

Answer:Pure air has about 78% nitrogen, 21% oxygen and 0.03% carbon dioxide. It does not contain dust particles and smoke in it.

Polluted air has pollutants like dust and carbon particles, smoke and harmful gases like sulphur dioxide, nitrogen dioxide, excess carbon dioxide and carbon monoxide in it.

 

Question 12. How does acid rain affect us?

Answer:Harmful effects of Acid Rain:Acid rain results in the corrosion of the marble of the buildings, monuments and statues made of marble, slate or limestone.

It increases the corrosion of metals.

It is harmful to aquatic life.

It damages the leaves of plants and trees.

It affects adversely the vegetation and reduces reproduction.

 

Class-8 Science Chapter-16 Light

 EVENTS CONVENT H. SCHOOL

23/02/2021         Class-8                 SLOT-2
SCIENCE
Chapter-16
LIGHT

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 Question 1.Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

 

Answer:We cannot see objects in the dark room. But we can see objects outside the room, in case there is light outside the room. To see an object, we need light which must reflect from the object to the eyes.

 

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

Answer:Following are the differences between a regular reflection and diffused reflection:

No, diffused reflection is not due to 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.

(a) Polished wooden table

(d) Chalk powder

(b) Cardboard surface

(e) Marble floor with water spread over it

(c) Mirror

(f) Piece of paper.

Answer:

(a) A polished wooden table will have regular reflection because its surface is smooth.

(b) A chalk powder will get the diffused reflection because chalk particles are not smooth.

(c) Cardboard surface has minute irregularities on it, so it will have a diffused reflection.

(d) Marble stone with water spread over it will have regular reflection if water is stable but if waves are formed then diffused reflection will take place.

(e) A mirror will reflect light regularly due to its smooth surface.

(f) A piece of paper will have irregular reflection due to minute irregularities on it.

 

 Question 4.Fill in the blanks in the following:

(a) A person 1 m in front of a plane 2

(b) If you touch your ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with left, left hand

(c) The size of the pupil becomes when you see in dim light. large

(d) Night birds have cones than rods in their eyes. lesser

 

Question-5 Choose the correct option in Questions  :

 

1 .Angle of incidence is equal to the angle of reflection

(a) Always (√)

(b) Sometimes

(c) Under special conditions

(d) Never.

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.

 Question 6.Draw a labeled sketch of the human eye.

Answer:

 A. Short Answer Type Questions

Question 1.What do you understand by the refraction of light?

Answer:The deviation (bending) of a ray of light when it passes from one transparent Medium to another, is called refraction of light.

 Question 2.What happens when light passes from one transparent medium to another transparent medium?

Answer:The velocity of light changes and also the direction of movement of light changes.

Question 3.What is refracted ray?

Answer:The ray of light emerging in the

 

B. Long Answer Type Questions

Question 4.Where should an object be placed for using a convex lens as magnifying glass?

Answer:Object should be placed between focus and lens.

 Question 5.How does retina send sensations to brain?

Answer:Retina sends sensations to brain through nerve cells.

 
Question 6.What is a mirror? What kind of image is formed in a mirror?

Answer:Any smooth and shining surface can act as a mirror. A mirror is a smooth surface which is polished from its back and can form the image of the object which is placed in front of it. The image formed by a mirror is a virtual and erect and is of the same size as that of the object in front of it.

 

Question 7.What is dispersion of light?

Answer:A beam of white light consists of seven colours. When a beam of white light passes through a prism, it splits into its seven constituent colours. The splitting of white light into its seven constituent colours is called dispersion of light. Rainbow is a natural phenomenon showing dispersion.

Class-5 Environmental science ("Slot-2 Revision Questions")

 EVENTS CONVENT H. SCHOOL

70, LALA LAJPAT RAI COLONY, BAGH DILKUSHA BHOPAL

SLOT-2 REVISION QUESTIONS
 Environmental science
class-5

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1.      Give One words of the following:-a

a       You get insatant energy when you drink this     -Glucose

b      Insect eacting plant        -Pitcher Plant.

c       These animals feed on dead bodies                            -Scavangers

d      The living organism produce their own food              -Autotrophse

e       A green pigment found in Plants  -Chlorophyll

f       Taste bud on our tongue inform us about -taste

g      Plants get carbon dioxide from the -Air

 

2.      Fill in the blanks:-

a.       Forest is full of trees  and plants.

b.      Chipko movement garhwal Himalayas saved thousand of trees.

c.       Fertilizers are added to the soil to restore its essential nutrients.

d.      A famine results either due to Natural or man made causes.

e.       Petroleum  is a dark colored thick crude oil.

f.       Like coal, petroleum takes  million  of years in their information.

g.      Our Nose help us to breathe.

h.      Lungs  Contract when we breathe out.

3.      Match the following:-

a.       Rearing of fish and sea animals          -          Pisiculture.

b.      Crops not grown for food                   -           Cash Crops.

c.       Raising of Chicken and ducks           -           Poultry farming.

d.       Most of the time we are                     -           Not conscious about our breathing.

e.       While running we use                         -          More energy than we normally do.

f.       On a cold day, we                               -           Blow on our hands insede them.

g.      When we breathe out,                         -           The lungs queeze out the air.

 

4.      Tick the correct option :-

a.       A large area of land thickly covered with trees and growing plants is called

                                       i.      Pasture                                    ii.Forest(√)

b.      These parts of trees hold the soil particles together and thus prevent soil erosion.

                                       i.  Roots(√)                                       ii.Fruits

c.       Scared groves in tamil nadu are called

                                       i.      Kovil dadu(√)                         ii.Deo bhumi

 

5.      Write True of Flase of the following:-

a.       Forest play a major role in making the air clean                                                      True.

b.      Historically the forest dwellers and tribes had absolute right over the forest and forest produce.                                                                                                                        True.

c.       We breathe faster immediately before running or doing some physical exercise    True.

d.      We breathe in oxygen                                                                                                True.

e.       We  can see clounds of mist coming out of our mouth on a hot day                        False.

f.       A normal individual breathes about 12 to 15 times in a minute                               True.

g.      Lips helps us to breathe                                                                                             False.

 

6.     Draw a Diagram of Tongue,Photosynthesis

 

7.     Write answer the following questions:-

Que-1 What is Digestion?

Ans-1  Digestion is a process in which complex food we eat is broken down into simple soluble substances. Our body is able to use theses substances.

 

Que-2 What is injected into patient’s blood suffering from dehydration?

Ans-2 Glucose injected into patient’s blood while patient is sufferting from dehydration.

 

Que-3 How do plants get food?

Ans-3 Plant get water and nutrients from the earth and carbon dioxide from the air.

 

Que-4 What is the importance of forests?

Ans-4 The Importance of forests are :

1.The forests are source of fruits, medicines, firewood and many other useful things.

2.Forest provide shelter to wild animals.

3.Forest Play a major role in making the air clean.

4.Forest are home to many tribal people .

Que-5 Name some of the tribes of India?

Ans-5 The Tribes of India are Bhils, Gonds, Khasis, and Mizos they are called adivasis which means first inhabitants.

Que-6 How do the forest People depend on forests and their products for their livelihood?

Ans-6 The forest provide tribes with food, fuels, fodder, medicines, shelter and clothing for many of these tribes, collecting and selling forest products.

Que-7 Why do farmers prefer to grow commercial or cash crop?
Ans-7 The fetch a much higher price in the market compared to the food crops. Hence more and more farmers prefer to grow cash crops.

Que-8 Why does food get spoiled?

Ans-8 Food items get spoiled due to the combined action of gems and bacteria..

Que-9 What are fossil fuels?
Ans-9Crude oil, Coal and nautral  gas are commonly known as fossil fuel.

Que-10 How is petroleum obtained from the earth’s crust?
Ans-10 Crude oil and petroleum is obtained by drilling holes called oil wells into the earth’s crust. The petroleum so obtained  is sent to an oil refinery for processing. Here, from crud Petroleum, Petrol, Kerosene, Diesel, Fuel oil and paraffin wax, etc are obtained.

 

Que.11 What is breathing?

Ans.11 Breathing is a natural process of taking in oxygen and giving out carbon dioxide.