Wednesday, 10 August 2016

CHAPTER-1 ECONOMICS CLASS-IX SAI Notes by Rabi sir


Economics (Ch-1)
The story Of Village Palampur

Introduction to the village Palampur

-This is a hypothetical village
-Farming is the main production activity
-Dairy, transport, small scale manufacturing are a few other activities
- Well connected with neighbouring villages and towns like Raiganj and Shahpur
-Bullock carts, tongas, bogeys, motorcycles, jeeps, tractors, trucks, can be seen on the ‘All Weather road’.
-Village has about 450 families of several different castes. Out of them 80 are upper caste who live in big & cemented houses and one third are SC who live in small houses in one corner of the village.
-Most houses have electric connection.
-Village has two primary schools and one high school,
-A primary health centre run by government and one private dispensary.


AIM OF PRODUCTION- To produce goods and services that we require and want.

Organization of Production (Factors / Requirements of Production)

1.    Land and other natural resources such as water, forests, minerals etc.
2.    Labour-some production activities require highly educated workers and others require workers who can do manual work. Each worker is providing the labour necessary for production.
3.    Physical Capital- i.e. variety of inputs required at every stage during production
·         Fixed Capital-tools, machines and buildings which can be used over many years like generators, tractors, computer etc.
·          Working Capital- raw material and money in hand which are used up in production.
4.    Human Capital- knowledge and enterprise to put together land, labour and physical capital and produce an output.

Every production is organized by combining land, labour, physical capital, which are known as Factors of Production.


FARMING IN PALAMPUR

Farming is the main production activity.75% of the people who are working are dependent on farming for their livelihood. They are farmers or farm labourers.
Constraint-Land area under cultivation is fixed. Some of the wastelands had been converted to cultivable land but there is no further scope to increase farm production by bringing new land under cultivation.

WAYS TO GROW MORE FROM SAME LAND

1)       Multiple Cropping-To grow more than one crop on a piece of land during the year is known as multiple cropping.
2)       Modern Farming Method-Use of modern techniques in farming like HYV seeds, chemical fertilizers, irrigation facilities like tube wells, pesticides, modern machinery like tractors, threshers, harvesters etc.






DIFFERENCE BETWEEN

  
             TRADITIONAL FARMING

                  MODERN FARMING
-Seeds used in cultivation were traditional ones with low yield.

-Traditional seeds needed less irrigation.

-Cow-dung and other natural manure were used as fertilizers.

-Yield-1300 kg per hectare.
-Sickle, wooden plough and other traditional tools were used
-High yielding variety (HYV) seeds are used.


-HYV seeds need plenty of water.

-Chemical fertilizers and pesticides are used to produce best results.

-Yield-3200 kg per hectare.
-Modern machines like tractors, threshers, harvesters are used.

Green Revolution-The Green revolution in 1960s introduced Indian farmers to cultivation of Wheat and rice using HYV seeds, chemical fertilizers, pesticides, irrigation facilities. Farmers of Punjab, Haryana, and Western UP were the first to try out modern farming methods in India. They bought tractors, threshers, which made ploughing and harvesting faster. Farmers now had greater amounts of surplus wheat to sell in markets.

Disadvantages of modern farming methods
-These methods have overused the natural resource base
-Resulted in loss of soil fertility due to increased use of chemical fertilizers
-Tube well irrigation has reduced has reduced water table below the ground
-Chemical fertilizers penetrate into the soil and pollute ground water

Land distribution between the farmers

-LANDLESS: One third of the families involved in agricultural activities are landless i.e. they have no land for cultivation. They provide labour on the fields of big and medium farmers
-SMALL FARMERS: some farmers cultivate small plots of land i.e. less than 2 hectares. Farmers along with their families cultivate the field.
-big and medium farmers have large plots extending over 10 hectares or more. Hire farm labourers to work on their fields.


Landless farmers

They provide labour on the fields of big and medium farmers. They are paid wages in cash or in kind i.e. crop or sometimes meals. They are employed on daily basis or for a particular farm activity or for the whole year. Minimum wage set by government is Rs 60 per day but due to heavy competition they agree to work for Rs 35-40.

Capital needed for farming

Small farmers have to borrow money to arrange capital from large farmers or village moneylenders or traders. Rate of interest for such loans is very high.
Medium and large farmers have their own savings from farming because they have surplus production every year. They are thus able to arrange for the capital needed during the next season.






SURPLUS FARM PRODUCTS

Farmers retain apart of the wheat (production) for the family’s consumption and sell the surplus wheat. Small farmers have little surplus because their total production is small and from this a substantial share is kept for their own family’s need. Medium and big farmers have lot of surplus and thus they sell it in the market to traders and make huge profits. Traders at the market buy wheat and sell it to shopkeepers in the towns and cities.

Capital for the next season

Medium and big farmers put their most of their money in the bank account. Later they use the savings for lending to poor farmers who are in need of a loan. They also use the savings to arrange for the working capital for farming in the next season. They also use their savings to buy machinery, cattle, trucks or to set up shops. A part of the earnings is saved and kept for buying capital for the next season. Thus they are able to arrange the capital for farming from their own savings.

Small and poor farmers borrow from big farmers at a very high interest rate like 24% for 4 months. Poor farmers cultivate their own field, work as labourers on the lands of big farmers and even do their household chores.

NON FARM ACTIVITIES IN PALAMPUR

25% of the people are engaged in activities other than farming. Though there are a number of non farm activities in villages but the number of people employed is quite small.

Different non farm activities

1.    Dairy-dairy is a common activity in many families in villages of India especially north India. People feed their buffalos on jowar and Bajra. Milk is sold in neighbouring towns and cities. Traders in towns and cities have collection cum chilling centres where milk is transported to far away towns and cities.
2.    Small scale manufacturing- very less people at present are involved in manufacturing activity. Manufacturing in villages involve very simple production methods and is done on a small scale. They are carried out mostly at home or in the fields with the help of the family labour. Rarely are labourers hired.
3.    Shopkeepers and traders- number of people involved in trading is very less. The traders buy goods from the wholesale markets in the cities and sell them in the village. Small general stores in the village sell a variety of items like rice, sugar, tea, oil, biscuits, soap, toothpaste, pen, pencil, cloths, eatables etc. 
4.    Transport- this is a fast developing sector in villages. A variety of vehicles like tongas, rickshaws, tongas, trucks, jeep, bullock carts , carry people and goods from one place to another and in return they get paid for it.

Advantages of non farm activities

-Unlike farming, non farm activities require little land.
-People with small amount can set up non farm activities.
-Non farm activities generate employment opportunities.
-As the more villages get connected to towns and cities through roads, transport and telephone it is possible that the opportunities for non-farm activities in the village would increase in the coming years.



Change after the spread of electricity

-It helped farmers to irrigate their lands in a better way. Earlier they used to irrigate their lands with Persian wheels which was a slow process. But now with the help of electricity they could irrigate much larger areas quickly and effectively.
-Due to better irrigational facilities farmers could grow different crops all the year round.
-They are now not dependent on monsoonal rains which are uncertain and erratic.

Work of farmer with I hectare of land

-A small farmer will cultivate his small piece of land with traditional methods as he is poor and can not afford modern techniques.
-To meet his needs he will work on the field of some big farmer for Rs 35-40.
-To arrange for the working capital he will have to take loan from a moneylender, big farmer even if the rate of interest is very high.
-Because of this he will get struck into the cycle of loans.

Ways to increase non farm activities in villages

-Some small scale and cottage industries can be started.
-Poultry farming can be encouraged
-Technical training in cutting & tailoring, cycle and scooter repair, etc can be given
-Dairy farming with more facilities like collection cum chilling centers can be done
-shop keeping can be encouraged
-Government & co-operative banks can give loans to encourage non –farm activities in villages.CHAPTER-1 ECONOMICS CLASS-IX

Economics (Ch-1)
The story Of Village Palampur

Introduction to the village Palampur

-This is a hypothetical village
-Farming is the main production activity
-Dairy, transport, small scale manufacturing are a few other activities
- Well connected with neighbouring villages and towns like Raiganj and Shahpur
-Bullock carts, tongas, bogeys, motorcycles, jeeps, tractors, trucks, can be seen on the ‘All Weather road’.
-Village has about 450 families of several different castes. Out of them 80 are upper caste who live in big & cemented houses and one third are SC who live in small houses in one corner of the village.
-Most houses have electric connection.
-Village has two primary schools and one high school,
-A primary health centre run by government and one private dispensary.


AIM OF PRODUCTION- To produce goods and services that we require and want.

Organization of Production (Factors / Requirements of Production)

1.    Land and other natural resources such as water, forests, minerals etc.
2.    Labour-some production activities require highly educated workers and others require workers who can do manual work. Each worker is providing the labour necessary for production.
3.    Physical Capital- i.e. variety of inputs required at every stage during production
·         Fixed Capital-tools, machines and buildings which can be used over many years like generators, tractors, computer etc.
·          Working Capital- raw material and money in hand which are used up in production.
4.    Human Capital- knowledge and enterprise to put together land, labour and physical capital and produce an output.

Every production is organized by combining land, labour, physical capital, which are known as Factors of Production.


FARMING IN PALAMPUR

Farming is the main production activity.75% of the people who are working are dependent on farming for their livelihood. They are farmers or farm labourers.
Constraint-Land area under cultivation is fixed. Some of the wastelands had been converted to cultivable land but there is no further scope to increase farm production by bringing new land under cultivation.

WAYS TO GROW MORE FROM SAME LAND

1)       Multiple Cropping-To grow more than one crop on a piece of land during the year is known as multiple cropping.
2)       Modern Farming Method-Use of modern techniques in farming like HYV seeds, chemical fertilizers, irrigation facilities like tube wells, pesticides, modern machinery like tractors, threshers, harvesters etc.






DIFFERENCE BETWEEN

  
             TRADITIONAL FARMING

                  MODERN FARMING
-Seeds used in cultivation were traditional ones with low yield.

-Traditional seeds needed less irrigation.

-Cow-dung and other natural manure were used as fertilizers.

-Yield-1300 kg per hectare.
-Sickle, wooden plough and other traditional tools were used
-High yielding variety (HYV) seeds are used.


-HYV seeds need plenty of water.

-Chemical fertilizers and pesticides are used to produce best results.

-Yield-3200 kg per hectare.
-Modern machines like tractors, threshers, harvesters are used.

Green Revolution-The Green revolution in 1960s introduced Indian farmers to cultivation of Wheat and rice using HYV seeds, chemical fertilizers, pesticides, irrigation facilities. Farmers of Punjab, Haryana, and Western UP were the first to try out modern farming methods in India. They bought tractors, threshers, which made ploughing and harvesting faster. Farmers now had greater amounts of surplus wheat to sell in markets.

Disadvantages of modern farming methods
-These methods have overused the natural resource base
-Resulted in loss of soil fertility due to increased use of chemical fertilizers
-Tube well irrigation has reduced has reduced water table below the ground
-Chemical fertilizers penetrate into the soil and pollute ground water

Land distribution between the farmers

-LANDLESS: One third of the families involved in agricultural activities are landless i.e. they have no land for cultivation. They provide labour on the fields of big and medium farmers
-SMALL FARMERS: some farmers cultivate small plots of land i.e. less than 2 hectares. Farmers along with their families cultivate the field.
-big and medium farmers have large plots extending over 10 hectares or more. Hire farm labourers to work on their fields.


Landless farmers

They provide labour on the fields of big and medium farmers. They are paid wages in cash or in kind i.e. crop or sometimes meals. They are employed on daily basis or for a particular farm activity or for the whole year. Minimum wage set by government is Rs 60 per day but due to heavy competition they agree to work for Rs 35-40.

Capital needed for farming

Small farmers have to borrow money to arrange capital from large farmers or village moneylenders or traders. Rate of interest for such loans is very high.
Medium and large farmers have their own savings from farming because they have surplus production every year. They are thus able to arrange for the capital needed during the next season.






SURPLUS FARM PRODUCTS

Farmers retain apart of the wheat (production) for the family’s consumption and sell the surplus wheat. Small farmers have little surplus because their total production is small and from this a substantial share is kept for their own family’s need. Medium and big farmers have lot of surplus and thus they sell it in the market to traders and make huge profits. Traders at the market buy wheat and sell it to shopkeepers in the towns and cities.

Capital for the next season

Medium and big farmers put their most of their money in the bank account. Later they use the savings for lending to poor farmers who are in need of a loan. They also use the savings to arrange for the working capital for farming in the next season. They also use their savings to buy machinery, cattle, trucks or to set up shops. A part of the earnings is saved and kept for buying capital for the next season. Thus they are able to arrange the capital for farming from their own savings.

Small and poor farmers borrow from big farmers at a very high interest rate like 24% for 4 months. Poor farmers cultivate their own field, work as labourers on the lands of big farmers and even do their household chores.

NON FARM ACTIVITIES IN PALAMPUR

25% of the people are engaged in activities other than farming. Though there are a number of non farm activities in villages but the number of people employed is quite small.

Different non farm activities

1.    Dairy-dairy is a common activity in many families in villages of India especially north India. People feed their buffalos on jowar and Bajra. Milk is sold in neighbouring towns and cities. Traders in towns and cities have collection cum chilling centres where milk is transported to far away towns and cities.
2.    Small scale manufacturing- very less people at present are involved in manufacturing activity. Manufacturing in villages involve very simple production methods and is done on a small scale. They are carried out mostly at home or in the fields with the help of the family labour. Rarely are labourers hired.
3.    Shopkeepers and traders- number of people involved in trading is very less. The traders buy goods from the wholesale markets in the cities and sell them in the village. Small general stores in the village sell a variety of items like rice, sugar, tea, oil, biscuits, soap, toothpaste, pen, pencil, cloths, eatables etc. 
4.    Transport- this is a fast developing sector in villages. A variety of vehicles like tongas, rickshaws, tongas, trucks, jeep, bullock carts , carry people and goods from one place to another and in return they get paid for it.

Advantages of non farm activities

-Unlike farming, non farm activities require little land.
-People with small amount can set up non farm activities.
-Non farm activities generate employment opportunities.
-As the more villages get connected to towns and cities through roads, transport and telephone it is possible that the opportunities for non-farm activities in the village would increase in the coming years.



Change after the spread of electricity

-It helped farmers to irrigate their lands in a better way. Earlier they used to irrigate their lands with Persian wheels which was a slow process. But now with the help of electricity they could irrigate much larger areas quickly and effectively.
-Due to better irrigational facilities farmers could grow different crops all the year round.
-They are now not dependent on monsoonal rains which are uncertain and erratic.

Work of farmer with I hectare of land

-A small farmer will cultivate his small piece of land with traditional methods as he is poor and can not afford modern techniques.
-To meet his needs he will work on the field of some big farmer for Rs 35-40.
-To arrange for the working capital he will have to take loan from a moneylender, big farmer even if the rate of interest is very high.
-Because of this he will get struck into the cycle of loans.

Ways to increase non farm activities in villages

-Some small scale and cottage industries can be started.
-Poultry farming can be encouraged
-Technical training in cutting & tailoring, cycle and scooter repair, etc can be given
-Dairy farming with more facilities like collection cum chilling centers can be done
-shop keeping can be encouraged
-Government & co-operative banks can give loans to encourage non –farm activities in villages.

Wednesday, 3 August 2016

Class Vii HEAT AND TEMPRATURE

CBSE Class-7 Science Heat and temperature By Rabi sir Success point babusahi boudh
Questions: Fill in the blanks :
 (a) The hotness of an object is determined by its temperature.

(b) Temperature of boiling water cannot be measured by a clinical thermometer.


(c) Temperature is measured in degree
 Celsius.


(d) No medium is required for transfer of heat by the process of Radiation.

(e) A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of  conduction.


(f ) 
Clothes of dark colours absorb heat better than clothes of light colours.

Questions: Match the following :
(i) Land breeze blows during  à night
(ii) Sea breeze blows during-àday
(iii) Dark coloured clothes are preferred during àwinter
(iv) Light coloured clothes are preferred during-àsummer

Questions: What is heat?

Heat is a form of energy, entry or exit of which correspondingly increases or decreases internal energy of a body when no work is done on the body or by the body.

Questions: What is temperature?
A reliable measure of the hotness of an object is its temperature. Temperature is measured by a device called  thermometer.

Questions:What is clinical thermometer?

The thermometer that measures our body temperature is called a clinical thermometer
A clinical thermometer consists of a long, narrow, uniform glass tube. It has a bulb at one end. This bulb contains mercury.

Questions: Why clinical thermometer ranging 35oC to 42oC.?

The normal temperature of human body is 37°C.The temperature of human  body normally does not go below 35oC or above 42oC. That is the reason that this a clinical thermometer has the range 35oC to 42oC.

Questions: What is the use of the m a x i m u m - m i n i m u m thermometer?

Different types of thermometers are used for different purposes. The maximum and minimum
temperatures of the previous day, reported in weather reports, are measured by a  thermometer called the m a x i m u m - m i n i m u m thermometer.

Questions: What is the range of a laboratory thermometer?

The range of a laboratory thermometer is generally from –10°C to 110°C

Questions: Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth?

Kink prevents mercury level from falling on its own.

Questions: What is conduction?

Heat flows from a hotter object to a colder object. The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.

Questions: Why conduction is only possible in solids

In solids, generally, the heat is transferred by the process of conduction because particles of solids are closely packed and heat is transferred from the hotter end to the colder end of an object.

Questions: What are conductor and insulators?

The materials which allow heat to pass through them easily are conductors of heat. For examples, aluminum, iron and copper

The materials which do not allow heat to pass through them easily are poor conductors of heat known as insulators such as plastic and wood.

Questions: Explain how water heated by convection?

The water is  poor conductors of heat so do not heated by conduction.
When water is heated, the water became lighter. Hot water rises up. The cold water from the sides moves down towards the source of heat  This water also gets hot and rises and water from the sides moves down. This process continues till the whole water gets heated. This mode of heat transfer is known as convection

Questions: What is land and sea breeze explain?

During the day, the land gets heated faster than the water. The air over theland becomes hotter and rises up. The cooler air from the sea rushes in towards  the land to take its place. The warm air from the land moves towards the sea to complete the cycle. The air from the sea
is called the sea breeze.

At night  , The water cools down more slowly than the land. So, the cool air from the land moves towards the sea. This is called the land breeze

Questions: How does the heat from the sun reach us?

It cannot reach us by conduction or convection as there is no medium such as air in most part of the space between the earth and the sun. From the sun the heat comes to us by  another process known as radiation.

Radiation can take place whether a medium is present or  not.

Questions: In summer we prefer light-coloured clothes and in winter we usually wear dark-coloured clothes. Why

Dark surfaces absorb more heat and, therefore, we feel comfortable with dark coloured clothes
in the winter. Light coloured clothes reflect most of the heat that falls on them and, therefore, we feel more comfortable wearing them in the summer.

Questions: How Woolen clothes keep us warm in winter

Woollen clothes keep us warm during winter. It is so because wool is a poor conductor of heat and it has air trapped in between the fibres

Questions: Why one thick blanket  is less warm up than  two thin blankets joined together?

There ia  a layer of air in between the blankets..Since air is bad conductor of heat prevent body heat to escape out.

Questions: How is heat transferred in solids, liquids and gases?

The heat flows from a body at a higher temperature to a body at a lower temperature
In solids, generally, the heat is transferred by conduction. In liquids and gases the heat is transferred by convection. No medium is required for transfer of heat by radiation

Questions: Why we wear light cloths in summer?

Dark-coloured objects absorb radiation better than the light-coloured  objects. That is the reason we feel more comfortable in light-coloured clothes in the summer

Questions: What are the different thermometer scales?

Different thermometer scales

(a) The centigrade or Celsius scale: It is introduced by Celsius, is usually used in scientific laboratories. In this scale the lower fixed point or the ice-point is 0°C and the steam-point 100°C. The fundamental interval is divided in 100 equal parts; each part is called 1°C (one degree Celsius).


(b) The Fahrenheit scale: It is suggested by Gabriel Fahrenheit, is usually used in clinical and meteorological purposes. Here, the ice-point and the steam-point are correspondingly marked as 32°F and 212°F, and the fundamental interval is divided into 180 equal divisions. Each division is called one degree Fahrenheit. (1°F).

(c) Absolute scale or Kelvin scale: It is designed by Lord Kelvin, is used internationally in modern scientific world. In this scale the ice-point is marked 273K and the steam-point 373K, the fundamental interval is divided into100 equal divisions, like that in the Celsius scale. Each division is read as one degree absolute or one Kelvin (IK). In fact, Kelvin scale of temperature starts from the temperature corresponding to -273°C, taken as zero Kelvin 

Questions: What is the Relation between Celsius, Fahrenheit and Kelvin scales?

Since the range of temperature from ice-point to steam-point is equal in all the three scales, 100 centigrade degrees = (212 - 32) or 180 Fahrenheit degrees = (373 - 273) or 100 absolute degrees.
We consider three thermometers in the above three scales are dipped simultaneously in a liquid of certain temperature.
Let the temperatures recorded in the Celsius, Fahrenheit and Kelvin thermometers  respectively be C, F and K.    
Now it can be proved that  C / 5 = F- 32 / 9 = K- 273 /5

Questions: What is the unit of heat

Units of Heat
(a) C.G.S. unit of heat is Calorie.
(b) The M.K.S. or S.I. unit of heat is Joule

1 calorie equals 4.18 or 4.2 joules approximately.

Questions: The quantity of heat absorbed or given out by a substance during a thermal change depends on what factors?

The quantity of heat absorbed or given out by a substance during a thermal change depends on
(a) mass,
(b) difference of temperature and
(c) Specific heat of the material of the substance.

(a) Mass: A larger mass of a substance absorbs or gives out more heat than a smaller mass of it for a certain change of temperature. So, if 'H' be the quantity of heat absorbed or given out by a substance of mass 'm’ for a given change of temperature, H = m.

(b) Temperature: The heat absorbed or released by a certain quantity of a given substance increases or decreases accordingly as the difference between the initial and final temperatures is large and small. Thus, H= (T-t) where, (T-t) is the difference between the initial and the final temperatures of the body.

(c) Specific heat: This is a fundamental property of matter. An equal mass of different materials absorb or give out different quantities of heat, even if they are heated or cooled through the same range of temperature.This is also called specific heat capacity (abbreviated as SHC) in S.I. system.

Heat (H) absorbed or given out by body of mass (m) for rise or fall of temperature through t is given by H = mst. 

Questions: State similarities between the laboratory thermometer and the clinical thermometer

1. Laboratory thermometer and the clinical thermometer consist of a long, narrow, uniform glass tube.
2. Laboratory thermometer and the clinical thermometer have a bulb containing mercury at the end of the tube.
3. Laboratory thermometer and the clinical thermometer are marked with Celsius scale on the glass tube.

Questions: Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.

In between the layers of cloths there is trapped air. As air is bad conductor of heat so the out side low temperature do not get transferred to body as well as prevent our body heat to escape out side. Hence more layers of cloths keep us warmer during cold winter.

Questions: In places of  hot climate it is advised that the outer walls of houses be painted white. Explain.

In places of  hot climate it is advised that the outer walls of houses be painted white because a light colour absorb very less radiant heat  and we feel comfortable inside such houses due to lower temperature inside house.

Questions: Why stainless steel cooking utensils  are usually provided with copper bottoms?

The reason for this could be that  copper is the best conductor of heat than the stainless steel