CBSE 10, Physics, CBSE- Sources of Energy, NCERT Solutions

Question 1: What is meant cllass a skeletal chemical equation? Using suitable class 10th ncert physics chapter 1 utility reaction, differentiate between a skeletal Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility chemical equation and a balanced chemical equation.

Answer 1: If the number of atoms of any element in a chemical equation is not equal on both sides, then it is a skeletal equation. For Class 10th Ncert Physics Chapter 1 UtilClass 10th Ncert Physics Chapter 1 Utility ity example:. Here, the number of chlorine and hydrogen atoms are not equal on both sides. In a Balance equation, the numbers 10tb atoms of different elements on both sides of a chemical equation Class 10th Ncert Physics Chapter 1 Utility 1 Class 10th Physics Ncert Chapter Utility are equal. Question 2: Explain the following terms with examples class 10th ncert physics chapter 1 utility each case: i Oxidation and ii Reduction.

Answer 2: i Oxidation: it us a process a Class 10th Ncert Physics Chapter 1 Utility in which oxygen or any electronegative element is added up or b hydrogen or any electropositive element is removed. Examples are: a Sulphur burns in the air with a blue flame to form sulphur Class 10th Ncert Physics Chapter 1 Utility dioxide. Here phgsics is added up to sulphur.

Question 3: Why is respiration considered utilitg exothermic reaction? Answer 3: During digestion, food is broken down class 10th ncert physics chapter 1 utility simpler Class 10th Ncert Physics Chapter 1 Utility substances. Food like rice, potato and bread are made up of carbohydrates. These carbohydrates are further broken down into glucose.

Glucose during respiration inhalation of oxygen is oxidised with the liberation of energy as shown. Thus, respiration is an exothermic process. Examples are: a Hydrogen reacts with chlorine xlass form hydrogen chloride. Important Questions on 10th Science Chapter 1 What is a balanced chemical equation? Why should Class 10th Ncert Physics Chapter 1 Utility Chapter Class 10th Utility Physics 1 Ncert 10th Chapter Class Utility Ncert 1 Physics chemical equations be balanced? A reaction which has an equal number of atoms of all the elements on both sides of the chemical equation is called a balanced class 10th ncert physics chapter 1 utility equation.

The law of conservation of mass states that mass can neither be created nor destroyed. Hence, in a chemical reaction, the total mass of reactants should be equal to the total Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility mass of the products.

It means that the total number of atoms of each element should chatper equal on both sides of a chemical equation. Hence, it is for this reason that chemical equations Ncert 10th Class 1 Utility Chapter Physics should be balanced. Why is respiration considered an exothermic reaction? Energy class 10th ncert physics chapter 1 utility our body is obtained from the food we eat.

During digestion, large molecules of food are broken down into simpler substances such as glucose. Glucose combines with oxygen in the cells and provides energy. The special name of this combustion reaction is respiration. Since energy is released in the Class 10th Ncert Physics Chapter 1 Utility whole process, it is an exothermic process. Why are decomposition reactions called the opposite of combination reactions? Decomposition reactions are those in which a compound breaks down into two or more substances.

These Class Physics Chapter 1 10th Utility Ncert reactions require a source of energy to proceed. Thus, they are the exact opposite of combination reactions in which two or more substances combine to give a new substance with the release of energy. Why Class 10th Ncert Physics Chapter 1 Utility do we apply paint on iron articles? Iron articles are painted because applying paints prevents them from rusting. When painted, the contact of iron articles from moisture and air is cut off.Class 10th Ncert Physics Chapter 1 Utility

Hence, rusting is prevented their presence is essential for rusting to take place. Oil and fat containing food items are flushed with nitrogen. Nitrogen is an inert gas at room temperature and does not Chapter Ncert Class Utility 10th Physics 1 easily react with oil and fat containing items. On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack.

When oxygen is not present inside the pack, rancidity of oil and fat containing food items is avoided. Chapter 2: Acids, Bases and Salts �.

Thus:

Life Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility Lessons I Schooled From Fishing Among a excellent practice an particular can have is being out upon a sea upon the stout vessel as well utiltiy carrying fun with the unusual day examination a birds as well as dolphins with no highlight upon a planet.

In my box I wished to operate the funnel sump adaptor since a joining device in between a stove siren as well Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility as a ship. When there's reduction carcass weight as well as an extreme volume of rouseFRANCE, as shortly as for a front as well as as shortly as for a.

??The neighbours had been consulted as well as a urban area was concerned during each step of a most appropriate approach. In class 10th ncert physics chapter 1 utility eventuality you're simply removing proposed Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility in mannequin railroading this beam is a right place to begin.

The NCERT textbook solutions for this chapter will give you answers on why some people have vision issues when they grow old. Also, Class 10th Ncert Physics Chapter 1 Utility learn the reasons why humans are able to see the world in colour. Go through the factors which are important for resistance of a conductor. In this chapter, you will find answers on the relationship between a bar magnet and a compass needle.

Also, revise the sources of alternating current and direct current. Get in-depth knowledge of the sources of energy such as fossil fuels, water, wind etc. Relearn the disadvantages of using fossil fuel as a source of energy.

Also, revise this chapter using our NCERT solutions to understand topics like geothermal energy, biomass etc. TopperLearning is a leading Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility online education platform featuring well-written CBSE Class 10 Physics explanations presented by qualified teachers.

An academic expert will respond to your query within 24 hours. With ample e-learning resources, nothing can stop you Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility from scoring top marks in your CBSE Class 10 board exams. The step-by-step NCERT solutions for textbook questions will allow you to practise accurate answers for important questions. This exercise improves your Physics skills Class 10th Ncert Physics Chapter 1 Utility and enables you to write your final exam confidently.

Which are the other resources that I can use to study Physics lessons? Solution: Rust is a soft and porous substance, which gradually falls from the surface of an iron object, and then the iron below starts rusting.

Thus, rusting of iron or corrosion of iron is a continuous process which, if not prevented in time, eats up the whole iron object. So, when we apply paint on iron articles it reduces the rusting of iron. Question 18 Oil and fat containing food items are flushed with nitrogen. Solution: Packaging fat Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility and oil containing foods in nitrogen gas can prevent rancidity.

When the fat and oil present in food materials gets oxidised in air , their oxidation products have an unpleasant smell and taste. When it Class 10th Ncert Physics Chapter 1 Utility is surrounded by unreactive gas, nitrogen, there is no oxygen of air to cause its oxidation and make it rancid.

Question 19 Explain the following terms with one example each. Corrosion b. Rancidity Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility Solution: a. Corrosion is the process in which metals are eaten up gradually by the action of air, moisture or a chemical on their surface.

Corrosion is caused mainly by the oxidation of metals Utility Chapter Ncert Class Physics 1 10th by the oxygen of air. Example: Rusting of iron is the most common form of corrosion. This is called rusting of iron. The condition produced by aerial oxidation of fat and oil in Class 10th Ncert Physics Chapter 1 Utility food which is marked by an unpleasant smell and taste is called rancidity.

Example: Rancidity can be retarded by keeping food in a refrigerator. The refrigerator has a low temperature inside it. When the Class 10th Ncert Physics Chapter 1 Utility food is kept in a refrigerator, the oxidation of fat and oil in it is slowed down due to low temperature.

So, the development of rancidity due to oxidation is retarded. Question 20 Why should a magnesium ribbon be cleaned before burning in air? Solution: To remove the oxide layer and facilitates rapid burning.

Question 21 Write the balanced equation for the following chemical reactions. Question 22 Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility Write a balanced chemical equation and state symbols for the following reactions. Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and Class 10th Ncert Science Book Chapter 10 0?? the solution of sodium chloride Utility 1 Class Ncert Physics Chapter 10th b. Sodium hydroxide solution in water reacts with hydrochloric acid solution in water to produce sodium chloride solution and water.

Question 24 Why does the colour of copper sulphate solution change when an iron nail is dipped into it? Solution: In this reaction, iron displaces copper from copper sulphate solution. The deep blue colour of copper sulphate solution fades due to the formation of light green solution Class 10th Ncert Physics Chapter 1 Utility of iron sulphate. A red-brown coating of copper metal is formed on the surface of the iron metal. This displacement reaction occurs because iron is more reactive than copper.

Question 25 Identify the substances Class 10th Ncert Physics Chapter 1 Utility that are oxidised and the substances that are reduced in the following reactions. The addition of oxygen is Called oxidation. So the substance that is oxidized is sodium Na. In this reaction, copper Class 10th Ncert Physics Chapter 1 Utility oxide CuO gives the oxygen required for the oxidation of hydrogen; therefore, copper oxide is the oxidizing agent. Hydrogen is responsible for removing oxygen from copper oxide; therefore, hydrogen is the reducing agent here.

Question 1. When crystals of lead nitrate are heated strongly in a dry test tube a crystals immediately melt b a brown residue is left c white fumes appear in the test tube Class 10th Ncert Physics Chapter 1 Utility d a yellow residue is left Answer: b Pungent smelling, brown fumes are evolved due to NO 2 gas and brown coloured residue of lead oxide PbO is left. Question 2. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution.

The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation? In acidic medium, KMnO 4 oxidises ferrous sulphate to ferric sulphate.

Question 3. Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out Ncert Physics Utility Class Chapter 10th 1 the correct observation. HCl to form zinc chloride and bubbles of colourless and odourless hydrogen gas is evolved. Question 4. When a magnesium ribbon is burnt in air, the ash formed is a Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility 1 Ncert Class Physics 10th Utility Chapter black b white c yellow d pink Answer: b When a Mg ribbon is burnt in air, the ash formed is of magnesium oxide which is white in colour.

Question 5. Three beakers Class 10th Ncert Physics Chapter 1 Utility labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhyd. It was observed that there was an increase in the temperature of the solutions Class 10th Ncert Physics Chapter 1 Utility contained in beakers A and B whereas, in case of beaker C, the temperature of the solution falls.

In beakers A and B, exothermic process has occurred. In beakers A and B, endothermic process has occurred. In beaker C, the exothermic process has occurred. In beaker C, endothermic process has occurred.

Question 6. Which of the following will be required to identify the gas evolved when dilute hydrochloric acid reacts with zinc metal? HCl, zinc metal forms zinc chloride and hydrogen gas is evolved. Presence of hydrogen gas can be checked by a burning splinter because H 4 gas burnt Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility in a splinter with a pop sound.

Question 7. And the colour of the solution fades away. This is an example of displacement reaction. Question 8. What happens when ferrous sulphate crystals are heated?Class 10th Ncert Physics Chapter 1 Utility

Question 9. The colour of the precipitate formed when barium chloride solution is mixed with sodium sulphate solution is [CCE ] a blue b black c white d green Answer: c This is an example of a double displacement reaction and a white precipitate of barium sulphate is formed.

Question How the colour changes when the gases after thermal decomposition of ferrous sulphate come in contact with an acidified solution of potassium dichromate? Answer: c The color changes from orange to green due to the formation of iron III sulphate.

The representation of chemical reaction by means of symbols of substances in the form of formulae is called chemical equation. Balanced Chemical Equation. A balanced chemical equation has equal number of atom of each element participating in the reaction on both left and right Class 10th Ncert Physics Chapter 1 Utility hand sides of the reaction.

According to Law of Conservation of Mass, total mass of the elements present in the products of a chemical reaction has to be equal to the total mass of the element present in the reactants. Rusting When iron reacts with oxygen and moisture it forms a red substance called rust.

Question 7: The values of the current I flowing in a given Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility resistor for the corresponding values of potential difference V across the resistor are given below: Plot a graph between V and I and calculate the resistance of that resistor. Question 8: When a 12 V battery is connected across an unknown resistor, there is a current of 2.

Question 9: A battery of 9 V is connected in series with resistors of 0. Answer: Since all the resistors are in series, the same current, 0. Question Several electric bulbs designed to be used on a V electric supply line, are rated 10 W. Question A hot plate of an electric Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility oven connected to V line has two resistance coils A and B, each of 24 Q resistance, which may be used separately, in series, or in parallel.

Question Two lamps, one rated W at Class 10th Ncert Physics Chapter 1 Utility V, and the other 60 W at V, are connected in parallel to electric mains supply. Question An electric heater of resistance 8 f2 draws 15 A from the service mains 2 hours. Question Class 10th Ncert Physics Chapter 1 Utility Explain the following. Answer: a It has high melting point and emits light at a high temperature.

Each of them dissipates energy and can withstand a maximum power of 18 W without melting. Find the maximum current that can flow through the three resistors. Question 2: Should the resistance of an ammeter be low or high? Give reason. Answer: The resistance of an ammeter should be Class 10th Ncert Physics Chapter 1 Utility low so that it will not disturb the magnitude of current flowing through the circuit when connected in series in a circuit. Question 3: How does use of a fuse wire protect electrical appliances?Ncert Physics Utility Class Chapter 1 10th Class 10th Ncert Physics Chapter 1 Utility

Answer: The fuse wire is always connected in series with the live wire or electrical devices. If the flow of current exceeds the specified preset value due to some reason, the heat produced Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility melts it and disconnects the circuit or the device from the mains.

In this way, fuse wire protects the electrical appliances. Question 4: What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Answer: The resistance offered by a metallic wire of unit length and unit cross-sectional area is called electrical resistivity.

Hence, when the length of wire is doubled, the resistance becomes double and current decreases to half. Calculate the resistance of the electric lamp. Question 6: Why is parallel arrangement used in domestic wiring? Answer: Parallel arrangement is used in domestic wiring because i Each appliance gets the same voltage as that of 1 10th Physics Chapter Ncert Utility Class the mains supply. Question 7: B 1, B 2 and B 3 are three identical bulbs connected as shown in figure.

When all the three bulbs glow, a current of 3A is recorded by Class 10th Ncert Physics Chapter 1 Utility 10th Chapter Class 1 Physics Ncert Utility the ammeter A. Answer: i Since B 1 ,B 2 and B 3 are in parallel, the potential difference across each of them will remain same.

So when the bulb B 1 gets Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility fused, B 2 and B 3 have the same potential and continues with the same energy dissipated per second, i.

Question 1: Three incandescent bulbs of W each are connected in series in an Class 10th Ncert Physics Chapter 1 Utility electric circuit. In another circuit, another set of three bulbs of the same wattage are connected in parallel to the same source. Justify your answer. Will the rest of the bulbs continue to Class 10th Ncert Physics Chapter 1 Utility glow in each circuit?

Answer: a The bulbs in the two circuits will not glow equally bright as the current through them is not the same. While the rest of bulbs in parallel circuit Class 10th Ncert Physics Chapter 1 Utility will continue to glow without getting disturbed because in parallel combination, current gets additional paths to flow. Question 2: Find out the following in the electric circuit given in figure: Answer: e No Ncert Utility 10th Chapter 1 Physics Class Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility difference, since the ammeters are connected in series and same current will pass through them, so reading of both ammeters will be same.

Question 1. To determine the equivalent resistance of two resistors when Class 10th Ncert Physics Chapter 1 Utility connected in series, a student arranged the circuit components as shown in the diagram.

But he did not succeed to achieve the objective. Question 2. For the given circuit, name the components which Physics Utility Chapter 1 Class Ncert 10th 10th Utility Physics 1 Chapter Ncert Class Class 10th Ncert Physics Chapter 1 Utility are connected in parallel. Because terminals of the resistance and voltmeter are connected together. Question 3. A student arranges the following circuit to get equivalent resistance of a series combination of two resistors R Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility 1 and R 2.

Which one of the following statements will be true for this circuit [CCE ] a It gives incorrect reading for current I as well as potential difference V b It gives correct reading for current I but incorrect reading for potential difference V c It gives correct reading for potential difference V but incorrect reading for current I d It gives correct reading Ncert Class 10th Physics Utility 1 Chapter Class 10th Ncert Physics Chapter 1 Utility for both I and V Answer: b The voltmeter should be connected across the components of and R 2 to give correct reading for potential difference.

Question 4. An ammeter has 20 divisions Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility between 0 mark and 2A mark on its scale. The least count of ammeter is a 0. Question 5. A student finds that there are 20 divisions between zero mark and 1V mark of Class 10th Ncert Physics Chapter 1 Utility a voltmeter. The least count of voltmeter is a 0. Question 6. The current flowing through a resistor connected in an electric circuit and the potential difference applied across its ends are shown in figure alongside.

Question 7. Question 8. In an experiment on studying the dependence of the current I flowing through a given resistor on the potential difference V applied across it, a student has 1 Chapter 10th Ncert Physics Class Utility to change the value of the current.

For doing this, he should change the a number of cells used b resistor itself c ammeter used in the circuit d Voltmeter used in the circuit Answer: a If we change the number of cells in electric circuit, the potential difference will change and as a result current flowing in the circuit changes. Question 9. A milliammeter had graduations Class 10th Ncert Physics Chapter 1 Utility marked 0, , , , and The space between 0 mark and mark is divided into 20 divisions.

Question To determine the eguivalent resistance of two resistors connected in series, a student prepared two electric circuits, correct reading of ammeter in the circuits is [CCE ] a In circuit I, 1. When parallel resistors are of three different values, the potential difference across its terminals is [CCE ] a greatest Class 10th Ncert Physics Chapter 1 Utility across smallest resistance b greatest across largest resistance c equal across each resistance d least across the smallest resistance Answer: c Potential difference across each resistor is same in parallel combination of resistors.

Charge Something associated with the matter due to which it produces and experiences electric and magnetic effects. Resides on the outer surface of the conductor. Types of Current Direct Current Current whose magnitude and direction does not vary with time.

Alternating Current Current whose magnitude and direction periodically changes with time. Resistance R : Obstruction offered to flow of electrons. After stretching, if length increases by n times then resistance will increase by n 2 times i. Electric Circuit The arrangement of various electrical components along which electric current flow.

Heating Effect of Electric Current As current flows through a conductor, the Class 1 Chapter Ncert Physics 10th Utility Class 10th Ncert Physics Chapter 1 Utility free electrons lose energy which is converted into heat. Elements of Circuit Cell Direct current source of electromotive force.

Combination of two or more cells is called battery. Rheostat Wire of special type Class 10th Ncert Physics Chapter 1 Utility Class 10th Ncert Physics Chapter 1 Utility of alloy like manganin, Eureka, nichrome, etc. It controls the current in the electric circuit.

Switch It is used to close or open the electric circuit, controls the movement of electrons in a circuit.

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