Tuesday, December 7, 2021

Class-6 Subject English Grammer Essay Population problem

EVENTS CONVENT HIGH SCHOOL

 *Essay- Population Problem*

*Class-6

Introduction – Population is a big problem of world and the India. In India Population become a serious problem.Every day increasing India population. Mainly due to lack of awareness among the people of India.


Population in India – Land for People to live availability of the cities is declining the population of cities is increasing due to which the environment is also being polluted.


The population in India is increasing as if a typhoon has occurred and it has become a serious problem of India. Apart from this the government has already no more good measures was taken for population control in India.


Pattern growth of Population – India Pattern of population growth it is growing faster in the India ruler areas resulting in not only bigger landless families forcing migration ot towns increasing the numbers of slums but also dividing land holding into unvisible entities.Both these result in lowering the already low standards of living healthcare and Education.


Causes of Population Explosion – The causes of population explosion many factor and the reasons. Increasing the birth rate of India in the ruler areas. India high level of illiteracy and the biggest problem of the family planing.



Conclusion- Rulers areas are the main roll of Population. Rulers areas unemployment and he illiteracy Poverty are the big reson of population problem doe to large population there a large number of people who belong to poverty in the India.

Wednesday, December 1, 2021

CLASS-8 SUBJECT SCIENCE CHAPTER-12 FRICTION

 EVENTS CONVENT HIGH SCHOOL

27/11/2021      CLASS- 8   SESSION 2021-22
SUBJECT : SCIENCE  

CHAPTER-12 
FRICTION

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Question 1.Fill in the blanks.
(a) Friction opposes the ______ between the surfaces in contact with each other.
(b) Friction depends on the ______ of surfaces.
(c) Friction produces ______
(d) The sprinkling of powder on the carrom board _______ friction.
(e) Sliding friction is _______ than the static friction.
Solution:
(a) relative motion
(b) smoothness (or irregularities or nature)
(c) heat
(d) reduces
(e) less

Question .2 Very Short Questions and Answers

Question 1.
Define friction.
Answer:
Friction is the force which resists the motion of a body, while moving on a surface.

Question 2.
What is meant by sliding friction ?
Answer:
When one surface is sliding over the other, sliding friction comes into play.

Question 3.
When does static friction come into play ?
Answer:
Static friction comes into play to counter balance the applied force on the body.

Question 4.
What are lubricants ?
Answer:
The substances which reduce friction are called lubricants.

Question 5.
What is rolling friction ?
Answer:
When one body rolls over the surface of another body, the resistance to its motion is called the rolling friction.

Question 6.
What are fluids ?
Answer:
Fluids is the common name given to gases and liquids.

Question 7.
Do fluids exert friction ?
Answer:
Yes, fluids also exert friction.

Question 8.
What is meant by air resistance ?
Answer:
There is friction between a moving object and the air through which it moves, known as air resistance.

Question .3 Short Questions and Answers

Question 1.
When your writing desk is tilted a little, a book kept on it starts sliding down. Mention the direction of the frictional force acting on it.
Answer:
The frictional force acts in the upward direction.

Question 2.
You spill a bucket of soapy water on a marble floor accidently. Would it make easier or more difficult for you to walk on the floor ? Why ? [NCERT]
Answer:
It would be more difficult to walk on the floor with soapy water because when we walk on a soapy floor, there is little friction between the floor and the feet, so it becomes difficult to walk.

Question 3.
Put a tick mark on the correct choice :
When one object moves over the surface of other object.

  • surface of only lower object exerts frictional force on the upper object.
  • surface of only upper object exerts frictional force on the lower object.
  • surfaces of both the objects exert force on each other.
  • surfaces of both the objects exert force in a direction opposite to each other.

Answer:
Surfaces of both the objects exert force in a direction opposite to each other.

Question 4.
Four children have got similar toy cars. They run the car on the dry marble floor, wet marble floor, newspaper and towel simultaneously. The force of friction between the car and different surfaces in increasing order will be :

  • Wet marble floor, dry marble floor, newspaper and towel.
  • Newspaper, towel, dry marble floor, wet marble floor.
  • Towel, newspaper, dry marble floor, wet marble floor.
  • Dry marble floor, wet marble floor, towel, newspaper.

Answer:
Wet marble floor, dry marble floor, newspaper and towel.

Question 5.
Explain why sportsmen use shoes with spikes. [NCERT]
Answer:
Sportsman use shoes with spikes to increase the friction. In this way, the sportsman can run faster.

CLASS-6 SUBJECT-SCIENCE CHAPTER-4 SORTING MATERIAL INTO GROUPS

 EVENTS CONVENT HIGH SCHOOL

01/12/2021      CLASS- 6   SESSION 2021-22
SUBJECT :SCIENCE

CHAPTER-4
SORTING MATERIAL INTO GROUPS

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Q. 1. State whether the statements given below are ‘true’ or ‘false’.

(i) Stone is transparent, while glass is opaque.
(ii) A notebook has lustre while eraser does not
(iii) Chalk dissolves in water.
(iv) A piece of wood floats on water.
(v) Sugar does not dissolve in water.
(vi) Oil mixes with water. 
(vii) Sand settles down in water.
(viii) Vinegar dissolves in water.
Ans.
(i) False
(ii) False
(iii) False
(iv) True
(v) False
(vi) False
(vii) True
(viii) True

Q. 2. Given below are the names of some objects and materials:
 Water, basket ball, orange, sugar, globe, apple and earthen pitcher Group them as:
(a) Round shaped and other shapes
(b) Eatables and non-eatables
Ans.
(a) (i) Round shaped: Basket ball, apple, orange, globe, earthen pitcher.
(ii) Other shapes: Water, sugar.
(b) (i) Eatables: Water, orange, sugar and apple.
(ii) Non-eatables: Basket ball, globe and earthen pitcher.


Q.3 VERY SHORT ANSWER TYPE QUESTIONS

1. Why do we need to group materials? Give one reason.
Ans: We often group materials for our convenience. It helps to describe their properties.

2. Suggest two bases on which we can group objects.
Ans:
(i) Material used in making the object, e.g. wood or metal/plastic.
(ii) Material of the object is soft or hard, or substance is soluble or insoluble in water.

3. Is a substance which can be compressed soft or hard?
Ans: Soft.

4. Select a lustrous material out of the following substances:
Ans: Aluminium.

5. Which material is generally used for making pens?Wood, aluminium, plastic, cotton 
Ans:Plastic or metal.

6. Is oil soluble in water?
Ans: Oil does not dissolve in water so it is insoluble in water but floats on the surface of water.

7. Name two objects which are made from opaque materials.
Ans: Wooden doors, blackboard/steel plate.

Q.4SHORT ANSWER TYPE QUESTIONS

1. Write any four properties of materials.
Ans:
(a) Appearance
(b) Hardness
(c) Solubility
(d) Float or sink in water
(e) Transparency

2. Why is a tumbler not made with a piece of cloth?
Ans: We use tumblers made of glass, plastic and metal to keep a liquid. These substances can hold a liquid.
A tumbler made of cloth cannot hold a liquid because:
(i) Cloth piece is not hard enough to hold liquids and
(ii) Cloth piece has very minute pores through which the’liquid oozes out.

3. What are the similarities between iron, copper and aluminium?
Ans:
(a) They all have lustre,
(b) They are all metals,
(c) They are hard.

4. Mention some materials which are made up of paper.
Ans: Books, notebooks, newspapers, toys, calendars, etc.

5. Why is water important for our body?
Ans: Water can dissolve a large number of substances, so it is needed by the body. It is also major part of our body cells.