Test Papers – ICSE – Class – X
ICSE Grade IX Economics Demo Videos
Hello dear students we are going to do chapter number six and economic signed the name of the lesson is food security in India let us quickly go through the index the first thing we shall study is the introduction towards this lesson the second thing what is food security who are food insecure what is hunger what are the different food security measures the flaws in the food security system the role of cooperatives in food security the suggestions for improving public distribution system and we shall end the lesson with the beautiful story of a food secure ahmad so here we go well my dear children in our national song Vande Mataram India is described as suphalam a land of abundant fertility where we can grow enough food grains to feed millions of people not only in India but also across the world also in a national song India is described as sujalam which means the land of abundant water but even then today in India we are facing food crisis let us go back to the times when India went through the Second World War My dear children during the second world war India be experienced a severe food crisis leading to a sharp rise in the prices of food grains so during the world what happened is the supply of food grains dropped in the market and that resulted in an increase in the prices of food grains again in 1943 the Bengal province faced a serious famine we’re nearly 35 lakhs people died of starvation the partition of India in 1947 Aggravated the food crisis in our country My dear children before 1947 this was called as the Punjab province it was a region well known for wheat production then came the partition of India which resulted in the birth of a new nation called Pakistan after the partition a large part of Punjab went to Pakistan and a small part of Punjab remained in India thus the partition of India aggravated the food crisis in our country in order to tackle the situation the government undertook measure called the food security measure so let us understand what is food security first of all my dear children food is as essential for living as air is for breathing but food security means something more than getting 2 square means the food and agriculture organization has defined for security as food security is ensuring that all people at all times have both physical and economic access to basic food they need now what do you mean by physical access it means the food is within reach of every person what is economic access it implies that an individual has enough money to buy sufficient safe and nutritious food well my dear children food security has following components the first availability of sufficient quantity and good quality food this depends on number one the full production within the country it also depends on the previous year stock stored in the government granaries and third it also depends on the food imports the second thing which is equally important is that enough purchasing power to acquire food now when I say purchasing power it implies that an individual has enough money to buy the food now this depends on the household income and the food prizes prevalent during that period the third of food security measure which is very important is the timely and long-term supply of nutritious food forth maintaining a buffer Stock what is a buffer stock it means a reserve of food grains now this is especially needed so as to take care of natural calamities we’re in the results shortages of food.
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ICSE Grade IX Commercial Studies Demo Videos
Hello students today we’ll be doing the sixth chapter of commercial studies which is partnership in this chapter will be defining partnership stating the features of partnership describing the merits of partnership explaining the demerits of partnership describing partnership did explaining registration of partnership firms discussing the types of partnership and finally describing the types of partners. in the previous chapter we learned about sole proprietorship and Hindu Undivided family business in this chapter we will be dealing with partnership firms and understanding them better the partnership firm of business is an extension of sole proprietorship which means if Rome is unable to meet the financial and managerial requirements of growing business of RV cakes she takes a partner vijay to support her in business. A partnership therefore is a voluntary Association of two or more persons who agreed to carry on some business jointly and share its profits and losses Roma cakes becomes partnership firms RV cakes when Roma and vijay out of their own free will choose to become partners in the firm they also decided to share the profits and losses off RV cakes. Roma and vijay are individually call s partners and collectively they are known as a firm the name under which the carryout business is called firm name so your RV cake is the firm name. Definition of partnership, partnership is the relation between two persons who have agreed to share profits off a business carried on by all or any one of them acting for on this means partnership is a relation between Roma and vijay who agreed to share profits of the business RV cakes. the business may be conducted by both Roma and Vijay or only Romo on behalf of Vijay and the firm next we move on to the features of partnership the first feature of partnership is two or more persons Roma cannot enter into a partnership herself therefore there must be two or more people to firm a partnership firm Roma can have maximum 20 partners in her business but if it is a banking form maximum number of partners is ten. RV cakes a firm cannot become partner of any other firm letters a YUM bakery. but vijay and roma can join YUM bakery as partner the second feature of partnership is agreement partnership is an agreement between Roma and Vijay this agreement could be oral or in writing the third feature of partnership is lawful business a partnership can be formed only for the purpose of carrying on legal businesses illegal activities like theft extra is not partnership. if Romo and her mother join me on a house without getting on a business it is not partnership the forth feature of partnership is sharing off profits. the profits of RV cakes is shared between Roma and Vijay in an agreed ratio here we can see that roma has sixty percent share in profits whereas Vijay has only forty percent share in profits similarly losses are also shared in an agreed issue this ratio is similar to the ratio in which profits shade which means roma has sixty percent Share in losses and vijay has forty percent Share in losses the fifth feature of partnership is mutual agency every partner is an implied agent of the other Roma and vijay major both are responsible for acts performed by each of them on behalf of the firm which is our RV cakes the sixth feature of partnership is at Utmost good faith Roma and vijay should have mutual trust and confidence in each other Roma and vijay just should keep no secret from each other. The seven feature of partnership is unlimited liability person sets of Roma and Vijay can be used such as roma’s jewellary and vijays bike can be used to take loans from banks. The eight and the final feature of partnership is a restriction on transfer of interest. the vijay can transfer his share in RV cakes to Seema only if it is approved by roma which means it should have roma consent thank you my dear students in the next module will be learning the distinguish between partnership and sole proprietorship firms.
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ICSE Grade IX Chemistry Demo Videos
Hello students are moving on to the laboratory method in laboratory how do we prepare hydrogen by action of a dilute acid on zinc so how do we go about it the chemicals used for the reactions are granulated zinc dilute hydrochloric acid, dilute sulfuric acid how do we go about it step one that we are following is take a stand place a flat bottom flask containing zinc renewals inside it so this is a stand for us we are going to attach our round bottom flask inside of which we are adding granulated zinc why granulated zinc is because zinc granules are preferred for this reaction rather than pure zinc because the impurities present in granulated zinc is copper which has a catalyzing effect and speeds up the rate of reaction for that reason zinc renewals are preferred and the second take on the second step what do we do we place 2 hold a rubber cork attach it to the round water flask through one of the whole or we are going to attach a thistle funnel self funded and through the second whole we are going to a attach delivery tube through a rubber cork now we have a tub which is filled with water inside of which we are going to have water inside of which are we are going to add our inverted gas jar which is attached to the Beehive shelf now insert the other end of the delivery tube to the gas jar now since the pattern set up done let’s move ahead how to how to perform the experiment and this is a delivery tube now through the thistle funnel we are going to pour either diluted HCL it that is hydrochloric acid dilute sulfuric acid through the funnel not the nitric acid why because nitric acid being a very strong oxidizing agent oxidizes the hydrogen and converted and into water and we are looking for hydrogen and not for water that is why we do not make use of nitric acid in the following reaction now the tip of the thistle funnel it should be dipped it HCl properly why so as to prevent the gas from escaping through the thistle funnel that is that is completely immersed in the acid now when the reaction takes place a between Zinc renewals and dilute Hcl it leads to formation of hydrogen gas and these hydrogen gases they pass through the delivery tube reaction will gradually start in the form of effervescence now what do we mean by effervescence these are rapidly forming bubbles which our colors effervescence now these effervescence which are of hydrogen gas it is collected by the downward displacement of water Because it is virtually insoluble in water what does hydrogen gas the hydrogen gas that is form it is insoluble in water and if you collect it over the air what happens is it forms an explosive mixture with air that is what we do not collect it in air why we are collecting it over water and cannot be collected by downward displacement of air that is why we are collecting it right on the displacement of water the reaction that inside apparatus the about just is zinc when it comes in contact with hcl it you get zinc chloride which is that ZnCl2 along with that hydrogen gas likewise if you make use of zinc Along with sulfuric acid that is dilute H2So4 you get zinc sulfate that isZnSo4 along with that there is a release of hydrogen gas so it’s arrow reaction need not be balance that is a second reaction Why because it’s a self balanced chemical reaction now impurities which are present in hydrogen can be now where do these impurities arise from granulated zinc being in impure on treatment with dilute hcl4 or a dilute sulfuric acid evolves in traces gaseous impurities what are those gaseous impurities will look at them and these impurities we further removed by passage of the impure gas through the three washer bottles and a UTube but first let us understand those impurities those impurities are Arsine which is Ash3 then you can also have phosphine impurities that is PH3 we can also have hydrogen sulfide that is H2S impurities it can also be Sulphure dioxide SO2 can also be carbon dioxide co2 can also be oxides of nitrogen that is NO,NO2 or N2O and can also be water vapour in the form of impurities.
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ICSE Grade IX Biology Demo Videos
Hello friends let us continue our discussion regarding the small intestine in the small intestine at the beginning of the chapter we said that are too large digestive glands the first among on which was the level and the second is the pancreas so let’s see about these two digestive glands in this module as we said liver so you’re we see the red large gland called as liver my dear friends is the largest a gland in the body which secretes a juice is called as bile juice .the bile juice is transported through the hepatic duct and stolen the gallbladder please do not confuse my dear friends bile juice is produced by the liver it is transported through the hepatic that and stored inside the green organ we see over your known as the gall bladder so you know we see the by a juice which is produced in the liver getting transported through the hepatic duct and getting stored inside the gallbladder the color of the bile juice is due to certain pigments called as a billiverdin and bilirubine produced by the breakdown of the Dead and worn out red blood cells so because of the breakdown of the dead and worn out red blood cells there are certain pigments called as billiverdin and the bilirubine which give a particular color to the bile juice now friends whenever the food enters the small intestine the gallbladder releases bile juice into it through the cystic duct now the food is entering the small intestine we know it enters into the small intestine from the stomach through the dior denim so when the food is entering the small intestine what happens is that the gallbladder releases the bile juice into it through the cystic duct so that which we see over your is the cystic duct through which the gallbladder releases the bile juice now friends the Bile contains a lot of sodium Bicarbonate so there is a lot of sodium bicarbonate present inside the bile which neutralizes the acid content of the food received from the stomach and it also makes the food time alkaline friends as we know inside the stomach what happened there were a Acidic enzymes correct so because of that acid ph the food became acidic we produced an acid take time now when the acidic of the time enters to small intestine because of the bile juice and the presence of sodium bicarbonate inside the bile juice what happens is that acidic time gets converted to alkaline so the bile juice when transported from the gallbladder makes the food alkaline it also reduces the surface tension my dear friends the bile reduces the surface tension of facts and breaks them into tiny droplets the process we call it as the emulsification of fats for providing a greater surface area for the action of enzymes so the bile juice what does it do it breaks down the fact molecules into tiny droplets this process is called as the emulsification of facts and you to the tiny droplets produce my dear friends what happens is that it provides a greater surface area to for the enzymes to act upon the food overall like to see the role of the bile juice in the food as we said the fact when acted upon by the bile it gets converted to tiny droplets we call this as the emulsified fat and next is the acid a time when acted upon by bile and you do the presence of sodium bicarbonate as they see here it gets converted to an alkaline time now friends the next gland we shall be seeing the next gland is the pancreas so the pancreas to secrete pancreatic juice now pancreas my dear friends are the organs which are located behind the stomach of a person so pancreas are located behind the stomach and the secreted juice scholars pancreatic juice the pancreatic duct pancreatic duct is a pancreatic opening open the duodenum by a aperture aperture is an opening my dear friends so the pan creating that opens into the duodenum by an aperture or an opening comment to that of the bile duct . means what that there is a common opening for the cystic duct called as the bile duct and the pancreatic duct so we call it as the common duct so we see the juices the bile juices as well as the pancreatic juices getting open into the duodenum by a common duct so you’re is the common duct which lets in also the bile juices as well as the pancreatic juices now friends let us understand the enzymes which are there inside the pancreatic juice the first enzyme my dear friends is the trypsin so trypsin is digesting the remaining proteins inside the food and the polypeptides so the trypsin is digesting are breaking down the remaining proteins and polypeptides in the food so here we see the proteins when acted upon by trips and produces a smaller peptides and amino acids trypsin my dear friends is first secreted as an inactive trypsin in origin please remember this trypsin is first the seCreator as inactive trypsinogen which is activated to trypsin by an enzyme called as enterokineas called enteropeptidase secreted by the inner lining of the duodenum so the inner lining of the duodenum secrets enter peptidase which activates the tryinpsin origin to trypsin the second enzyme is steapsin . steapsin digest emulsifier facts into fatty acids and glycerol so you’re we see the steapsin acting upon the facts to form emulsified facts the third enzym my dear friends is the pancreatic amylase or amylopsin and so pancreatic amylase is also called as a amylase let’s see what does pancreatic Amylase do pancreatic Amylase digest leftover starch into malstach so pancreatic amylase list acts upon the leftover start to produce malstach so these were the three enzymes present inside the pancreatic juice so now let us see the overall role of pancreatic juice on the food as we said that is a trypsinogen which is the inactive form of trypsin trypsinogen then acted upon by enterokinase which is an enzyme makes the trypsinogen active in two trypsin the next is proteins and peptides when acted upon by trypsin it gives smaller peptides an amino acids the next we see the leftover starch when acted upon by amylase produces my malstoch and emulsified facts when acted upon by stepsin and it produces fatty acids plus glycerol so you’re we have trypsinogen when acted upon by enterokinase gives us strips and which is an active form proteins and peptides been acted upon by Trypsin the smaller peptides and amino acids and the leftover starch to an acted upon by a Amylase gives us malstoch and emulsifying facts when acted upon by steapsin it gives us a fatty acids and glycerol so you’ll receive the digestive function of the small intestine my dear friends now let us see about absorption in the further modules.
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ICSE Grade X Physics Demo Videos
so students in this model will look at the nuclear fuel as a source of energy the advantages of using the nuclear energy and limitations of using nuclear energy firstly let us begin by understanding what is nuclear energy energy harnessed from the nucleus of an atom is called nuclear energy . so let’s see how this is harnessed this can be harnessed in two ways. the first one is nuclear fission and the second one is nuclear fusion. now what is nuclear fission splitting up of heavy nucleus into lighter one is called nuclear fission and what is fusion nuclear fusion is a combination of two lighter nuclear to form heavy nucleus so in short students fission is splitting and fusion is combination .now let’s discuss nuclear fission when we discuss nuclear fission . here we have this nuclear reactor now what is a nuclear reactor nuclear power reactor is extensively used for power generation as traditional fossil fuels like coal our extinction the nuclear reactor is a source of intense heat which is in turn use for generation of power now there are three main component so let’s see which are the three important component of a nuclear reactor the first component is a fuel element the second component is moderator and the third component is control rods so let us learn each of them in detail firstly to begin with fuel elements now the main fuel element which a nuclear generator has is fashionable uranium-235 or plutonium 239 can also be used as a fuel element now for assurance thermal Neutron are capable of producing fission reaction that uranium 235 let’s understand how this happens here we have this uranium 235 when uranium 235 is bombarded by slow-moving neutrons that is thermal neutrons they collide with uranium 235 and uranium 235 splits into barium and Krypton with the ejection of three neutrons now the mass of barium the three neutrons and Krypton is slightly less than uranium 235 and this mass gets converted into heat so difference in mass number of the lighter nuclei with respect to the heavy nucleus leads to the liberation of heat energy now this process doesn’t end here it’ll continue because this 3 neutrons will go further and hit three separate uranium-235 and from this that will be ejection of nine neutrons so here you can see this nine neutrons have come up this nine neutrons will further go and hit nine uranium-235 and in a very short time a huge amount of heat energy is generated and as a very huge amount of heat energy is generated this you can see is the example of uncontrolled chain reaction so if this reaction is not controlled in a very short span of time a huge amount of energy is generated and it can be used for destructive purposes that is a atom bomb now for the students let us come to the second part and understand what is a moderate to do now the moderator plays the role of more moderating this particular reaction so moderator has a capability to moderate of slow down this high-energy neutrons to deuterium which is nothing but a heavier hydrogen has a part to slow down the neutron speed because the deuterium is very heavy so when a slow-moving neutron goes and hits the deuterium its kinetic energy will decrease. now further students here this other control rods now what is a function of the control rods the main purpose of control rod is to absorb excess neutrons now to increase the rate of nuclear fission sometimes what is done is this rod can be removed from the moderator so if you remove the fission reaction will expand faster now this is how it works so this neutrons are made incident on the control rods that is cadmium so when they are incident on cadmium excess of this neutrons are absorbed and only a limited number of neutrons are left to carry forward efficient process so this is how it happens so this when it is control is called control chain reaction now for the students let us say in this particular section heat is produced the heat energy released in this process is absorbed by the coolant with then passes through the coils of a heat exchanger containing water so this will go to the coolant and from the coolant it goes into the heat exchanger now when it goes into the heat exchanger there’s water so the water in the heat exchanger gets heated and gets converted into steam now we all know has a very high pressure so this particular steam most of this narrow pipes and after moving to this particular narrow pipes the steam is used to rotate the turbine so when the turbine rotates the turbines is connected to the generator so in the generator the turbine makes the armature coil to rotate in the magnetic field and then the armature coil rotates in the magnetic field current is induced and we have induced EMF so students in this manner electricity is produced in a nuclear reactor and this was the basic walking of a nuclear reactor for the students let us understand that advantages of using the nuclear energy the first advantage a very small amount of nuclear fuel such as uranium 235 can produce a tremendous amount of energy the second advantage only the nuclear fuel is loaded into a nuclear power plant it continues to release energy over a long period so once the nuclear fuel is loaded the energy it emanates is for a very long Period now let us see what are the limitations why don’t we use this on a very large scale the first limitation it is not a clean source of energy because very harmful nuclear radiation are produced in the process which are highly energetic and penetrating now the second limitation is the waist obtained from the nuclear power plant causes a high degree of environmental pollution so the students was the advantages and limitations of using nuclear energy thank you..
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ICSE Grade X Mathematics Demo Videos
Hi students in this module from the chapter Heights and Distances Let’s show a sum based on Application Of trigonometry It’s going to be very interesting Let’s see the sum first which is Two vertical poles are on either side of a road A 30 metre long ladder Is placed between the two poles When the ladder Rest against 1 pole It’s makes angle 32 degree and 24 minutes with the pole and When it is turned to rest Against another pole It makes an angle 32 degree and 24 minutes with the road Calculate the width off the road Now this is what the sum says Right Let’s understand what are we supposed to draw It says the two vertical poles are on either side of the road You have two poles on either side of the road A 30 metre long ladder Is placed between the two poles You have a 30 metre long ladder Length of the ladder is given to us as 30 metres Now this is placed in such a way that when ladder rests to 1 pole It makes angle of 32 degree and 24 minutes With the pole Right when it is placed On one pole The angle made by the ladder with the pole The angle there Its nothing but It is 32 degree and 24 minutes And when it is turned To rest against the another pole Now its rest on the other pole Here here It makes 32 degree and 24 minutes with the road Right very important Thing to be noted there When it is rested like this The angle made by the ladder with the road Its nothing but 32 degree and 24 minutes Very important thing right first with the road then with the pole Right The sum says find Calculate the width of the road So we need to find the width of the road And we say the width of the road We are saying find the length of BD That is what we need to find So this is what we have in the sum Let’s think how I going to get this It’s going to be very easy Very simple Let’s see the sum Right here we going to describe First will say that AB and DE represents the two poles That is what we have there Right Then we have AC and CE It represents the two positions of the ladder Right AC Is the first position and CE is the next position they represents the two positions of the ladder Right and we have AC=CE=30m This is known to us And we have those two angles there angle BAC is 32 degrees and 24 minutes and angle ECD has 32 degrees and 24 minutes That is what we have we need to find BD observe BD look at BD BD is the width of the road right BD is nothing but made up of two things BC and CD so we need to first find the value BC then the value of CD lets find out BC you know the BC belongs to the right angle triangle ABC consider that right angle triangle ABC infact we have an acute angle yes let’s look at that for that acute angle BC something which we need to find that appears in the opposite side and what given to us is AC is the hypotenuse we are taking about opposite side of hypotenuse right opposite side and hypotenuse which ratio comes to your mind which trigonometry ratio yes its nothing but sin so were going to use sin for that angle so you’re going to use sin of angle BAC = BC/AC so you know the sin of BAC means it is sin of 32 degree and 24 mins that’s equal to BC if you don’t know keep it as it is AC we know that is 30 so BC upon 30 right beautiful now we are going to get that value of sin 32 degree and 24 mins from the trigonometric table from natural sines from that table if you see in that row which contains 32 and in the column which headed by 24 mins see there the intersect of the two will give you the value of sin 32 degree and 24 mins which nothing but 0.5358 so we get that value substitute the value there so we got the value of sin 32 degree and 24 mins that is 05358 substitute that now the value of BC you don’t know keep it as it is and now we know that it BC/30 now BC = 0.5358 * 30 so now we just multiply it and the product which we get is the value of BC that is nothing but 16.074m you got the value of BC now we need to find the value of CD observe CD CD belongs to the right angle triangle CDE right we going consider it right triangle CDE in that right angle triangle CDE we have an acute angle that is 32 degree and 24 mins for that acute angle we need to find the adjacent side and what is known to us is the hypotenuse so we are taking about adjacent side and hypotenuse when talking about adjacent side and hypotenuse which trigonometric ratio comes to your mind yes it is nothing but the trigonometric ratio is cos so your going to use cos for that particular angle so we right cos of angle ECD = adjacent side that is CD upon the hypotenuse that is CE now we just need to substitute the value so we write cos of 32 degree and 24 mins = CD/CE which is nothing but 30 so now we need the value of cos 32 degree and 24 mins this is something which we can get from the table of natural cosines so now look there in that row consisting of 32 and that column headed by 24 mins observe the intersection of that two gives you the value of 32 degree and 24 mins which 0.8443 so you substitute the value there 0.8443 = CD/30 now it’s so simple now we get CD = 0.8443 * 30 now we get CD = 25.329m so you got the value of CD too wasn’t that easy now isn’t it easy to get the value of BD yes it is so simple now we can say that BD = BC + CD the value of BC if you see its simple it is 16.074 + the value of CD we know it is 25.329 add those two and we get the value of BD as 41.403 and if you round it off now we can say that BD = 41.4m that means width of the road is 41.4m was that easy a very important sum but a very simple one.
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