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NCERT Solutions for Class 10 Maths Ch 15 Probability

The NCERT Solutions for class 1 to class 12 has been written in order to help the students in all the level of grades. LearnCBSE has given detailed solutions for all the questions keeping the marking scheme for each question. This in turn, helps 10th ncert question answer io ace the exam with colourful grades. The main objective of this article is to help students to provide a 10th ncert question answer io foundation over all the subjects which are covered under their curriculum.

NCERT Solutions for class 11 is provided by the best teachers in order to help nfert of class 11 to ace the class 11 exam with decent grades. Class 11 NCERT solutions will not only help students to secure a good score in class 11 board exams but also helps to crack the engineering and medical competitive entrance exams. Class 10 plays a major role 10th ncert question answer io choosing the career stream in the higher secondary level.

So students who want to shine in grade 10 must score high in Class With the help of 10tn 10 NCERT solutions students will not only make a good grade in class 10 but will be also able to crack the competitive exams without any difficulty.

We have included all the important questions from similar to that of your Class 7 notes to help you get a decent score in the nfert CBSE Class 7 exams. NCERT solutions for class 6 gives you a strong foundation for every concept. 10th ncert question answer io on NCERT solutions will ensure a smooth and clear understanding of all the advanced concepts. We did not 10ty any chapters in each of the subjects.

This in turn, helps you not only in exams but also helps you complete your home works and qusetion on time. We have enlisted all the chapters in each subject. Your performance in the foundation exams will play a role in determining your admission into higher classes all the way to a good college or even your dream college!

If you have any query regarding this article or NCERT Sols for Class 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th and 12th, leave your comments in the comment section below and we will get back to you as soon as possible. NCERT is also known as the publishing body or publisher. It is an autonomous organisation set up in by the Government of India, aiming to assist and advise the Central as well as the State Governments on policies and programmes for 10th ncert question answer io improvement in school education.

The function of NCERT is to conduct and support educational research and to offer training in educational research methodology. But then again, simply byhearting the NCERT books a few weeks before the exams is not going to help the students with. Once done with studying and practicing with the books, students should solve the sample papers as well as previous year question papers to get an idea of the question paper pattern.

NCERT Answerr are basically practice-books that contain additional questions of a higher level, apart from NCERT textbooks, and are meant for providing comprehensive and thorough learning. A few, but major, goal of NCERT are as follows: To gear up, encourage and correlate research in areas connected with school education To put together and publish textbooks, supplementary material, newsletters, journals, digital materials, and 10th ncert question answer io study materials.

To organise pre-service and in-service training of teachers along with developing and distributing innovative educational techniques and practices The function of NCERT is to conduct and support educational research and to offer training in educational research methodology.

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How is Ausable different from other secret agents? Ausable was different from other secret agents in more ways than one and did not fit in the description of a normal agent. He had a small room in the musty corridor of a gloomy French hotel on the sixth and top floor and it was scarcely the setting for a romantic adventure.

He was extremely fat and had a very different accent. Though he spoke French and German passably, he never lost his American accent in spite of living in Paris for over twenty years. Instead of getting messages slipped into his hands by dark-eyed beauties, he got only a telephone call making an appointment. In these ways, he was different from the conventional notion of a spy. What does Horace Danby like to collect? Horace Danby was a good and respectable but not completely honest.

He liked to collect rare and expensive books. He robbed a safe every year and secretly bought book through an agent. Who is speaking to Horace Danby? A women was standing in the doorway. She was speaking to Horace Danby. She was young and pretty, and was dressed in red.

She said she had come just in time, or else her family would have been robbed by Horace. She, thus, pretended to be one of the members of the family living at Shot over Grange. How did the invisible man first become visible?

Griffin was a scientist. He had carried out experiments to make a drug that could make human body invisible. He consumed that rare drug and his body became invisible as a sheet of glass. He was completely invisible until he happened to step in some mud, which caused him to leave footprints as he walked. His footprints were seen by two boys, who followed him as long as the prints were visible.

On getting rid of them, he went into a big London. He lost the boys easily. It was winter and he put on some warm clothes from the store after it got closed and got dressed by putting on shoes, an overcoat and a wide-brimmed hat.

This made him visible to the people who came to work at the store the next day. Why does Mrs Hall find the scientist eccentric? The arrival of a stranger at an inn in winter was in itself a strange occurrence. Moreover he had an uncommon appearance. He told her that he had no desire to talk, and that all he wanted was solitude.

He did not wish to be disturbed in his work and his face had been affected by an accident. For all these reasons she regarded him as an eccentric scientist. It is rightly said that Griffin was a lawless person. He was not a law abiding citizen.

He did acts that were against the law of the country. Griffin set fire to the house and became a homeless wanderer. He also robbed a shopkeeper of all the money he could find. Griffin also attacked Mrs. Hall when she entered his room. All these activities and instances prove that he was really a lawless person. He also collected rocks, fossils and coins. His mother said that by the time he was in the second grade, he had collected all the twenty-five species of butterflies found around his home town.

This would have been the end of his butterfly collecting. This book told him about the migration of monarch butterflies to Central America. It opened the world of science to an eager young kid.

This proved to be turning point in the life of young Richard Ebright. He began to raise Monarch butterflies in the basement of his home, and study them in different stage of their development. What kind of a person is Mme Loisel � why is she always unhappy? What would be the readings in the ammeter and the voltmeter?

Solution: The required circuit diagram is shown on the right. Answer: When the resistances are connected in parallel, the equivalent resistance is smaller than the smallest individual resistance.

What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it? Question 3 What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

Answer: Advantages of connecting electrical devices in parallel with the battery are :. Solution: i Highest resistance can be obtained by connecting the four coils in series. Question 1 Why does the cord of an electric heater not glow while the heating element does? Solution: Heat generated in a circuit is given by I 2 R t. The heating element of an electric heater made of nichrome glows because it becomes red-hot due to the large amount of heat produced on passing current because of its high resistance, but the cord of the electric heater made of copper does not glow because negligible heat is produced in it by passing current because of its extremely low resistance.

Question 2 Compute the heat generated while transferring coulomb of charge in one hour through a potential difference of 50 V. Calculate the heat developed in 30 s. Question 1 What determines the rate at which energy is delivered by a current? Answer: Resistance of the circuit determines the rate at which energy is delivered by a current.

Question 2 An electric motor takes 5 A from a V line. Determine the power of the motor and the energy consumed in 2 h. Question 1 A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. Question 2 Which of the following terms does not represent electrical power in a circuit?

Question 3 An electric bulb is rated V and W. Question 4 Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be : a 1 : 2 b 2 : 1 c 1 : 4 d 4 : 1 Answer: c 1 : 4. Question 5 How is a voltmeter connected in the circuit to measure the potential difference between two points?

Answer: A voltmeter is connected in parallel to measure the potential difference between two points. Question 6 A copper wire has diameter 0. How much does the resistance change if the diameter is doubled? Answer: If a wire of diameter doubled to it is taken, then area of cross-section becomes four times.

Question 7 The values of current I flowing in a given 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 the resistor.

Solution: The graph between V and I for the above data is given below. The slope of the graph will give the value of resistance. Let us consider two points P and Q on the graph. Question 8 When a 12 V battery is connected across an unknown resistor, there is a current of 2. Find the value of the resistance of the resistor.

Question 9 A battery of 9V is connected in series with resistors of 0. How much current would flow through the 12 Q resistor?

Thus 4 resistors are needed to be connect. The equivalent resistance is. Question 12 Several electric bulbs designed to be used on a V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of V line if the maximum allowable current is 5 A?

What are the currents in the three cases? Solution: i When the two coils A and B are used separately. Solution: i The circuit diagram is shown in figure. Question 15 Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is V?

Calculate the rate at which heat is developed in the heater. Question 18 Explain the following: i Why is tungsten used almost exclusively for filament of electric lamps? If the area of cross section of a conductor of fixed length is increased, then resistance decreases because there are more free electrons for movement in conductor. So, they do not become too hot on passing electric current.

Electric current, potential difference and electric current, Ohms law, Resistance, Resistivity factors on which the resistance of a conductor depends; Series combination of resistors, parallel combination of resistors; and its application on daily life; Heating effect of Electric current, electric Power, Interrelation between P, V, and R.

Formulae Handbook for Class 10 Maths and Science. Page What does an electric circuit mean? Electric circuit is a continuous and closed path made of conducting wires, through which the electric current flows. It comprises a cell, ammeter, voltmeter, plug key, etc. Define the unit of current. SI unit of electric current is ampere A.

Ampere is the flow of electric charges through an area at the rate of one coulomb per second, i. Question 1: Name a device that helps to maintain a potential difference across a conductor. Answer: Cell or battery eliminator. Question 2: What is meant by saying that the potential difference between two points is 1 V? Question 3: How much energy is given to one coulomb of charge passing through a 6 V battery Answer:.

Question 1: On what factors does the resistance of a conductor depend Answer: Resistance of a conductor depends upon: i Resistivity of the material. Question 2: Will current flow more easily through a thick wire or thin wire of the same material when connected to the same source? Question 3: Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value.

Answer: Hence, the current through an electrical component also becomes half of its previous value. Question 4: Why are the coils of electric toasters and electric irons made of an alloy rather than a pure metal Answer: The coils of electric toaster and electric iron are made of an alloy rather than a pure metal because of the following reasons; i The resistivity of an alloy is higher than that of a pure metal.

Question 5: Use the data in Table Question 2: Redraw the circuit of the above question, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the voltage across the 12 resistor. What would be the reading in the ammeter and the voltmeter? Question 1: Judge the equivalent resistance when the following are connected in parallel. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances and what is the current flows through it?

Question 3: What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series? Answer: Advantages of connecting electrical devices in parallel:.

Answer: a The highest resistance is secured by combining all four coils of resistance in series. Question 1: Why does the cord of an electric heater not glow while the heating element does? Answer: The cord of an electric heater is made up of metallic wire such as copper or aluminum which has low resistance while the heating element is made up of an alloy which has more resistance than its constituent metals.

Question 2: Compute the heat generated while transferring C of charge in one hour through a potential difference of 50 V. Question 3: An electric iron of resistance 20 Q takes a current of 5 A. Question 1: What determines the rate at which energy is delivered by a current?

Answer: Electric power determines the rate at which energy is delivered by a current. Question 2: An electric motor takes 5 A from a V line. Question 1: A piece of wire of resistance R is cut into five equal parts.

Question 2: Which of the following terms does not represent electrical power in a circuit? Question 3: An electric bulb is rated V and W. Question 4: Two conducting wires of same material and of equal lengths and diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be a b c d Answer:.

Question 5: How is a voltmeter connected in the circuit to measure the potential difference between two points? Question 6: A copper wire has a diameter 0. Question 7: The values of the current I flowing in a given 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 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 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 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 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? Answer: The fuse wire is always connected in series with the Class 10th Ncert Science Chapter 1 Question Answer live wire or electrical devices.

If the flow of current exceeds the specified preset value due to some reason, the heat produced 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 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 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.

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