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You can easily purchase this book from your nearby bookstore or online. NCERT textbooks contain all kinds of textual concepts required for studying the topic whereas NCERT exemplars contain questions related to the content mentioned in the textbook. Both books have their own importance and use. You can use these books for preparation for your competitive exams. NCERT textbooks contain sufficient information about topics and concepts required for boards applicant.
NCERT exemplar consists of the previous year asked questions, high order thinking questions, conceptual questions, and other different types of questions. NCERT exemplar for class 12th is easily available in your nearby bookstore and also at different online sites. You can easily download its pdf on the internet for free. NCERT exemplar consists of the previous year asked questions, high order thinking questions, conceptual questions, and another different type of questions.
NCERT exemplar for class 10th is easily available in your nearby bookstore and also at different online sites. You can easily secure a good position in the exam. Resistance is a property that resists the flow of electrons in a conductor. It controls the magnitude of the current. The resistance of a conductor depends directly on its length, inversely on its area of cross-section, and also on the material of the conductor.
The equivalent resistance of several resistors in series is equal to the sum of their individual resistances. One watt of power is consumed when 1 A of current flows at a potential difference of 1 V.
The commercial unit of electrical energy is kilowatt hour kWh. A compass needle is a small magnet. Its one end, which points towards north, is called a north pole, and the other end, Ncert Exemplar Class 10th Science Pdf 01 which points towards south, is called a south pole. A magnetic field exists in the region surrounding a magnet, in which the force of the magnet can be detected. Field lines are used to represent a magnetic field.
A field line is the path along which a hypothetical free north pole would tend to move. The direction of the magnetic field at a point is given by the direction that a north pole placed at that point would take. Field lines are shown closer together where the magnetic field is greater. A metallic wire carrying an electric current has associated with it a magnetic field.
The field lines about the wire consist of a series of concentric circles whose direction is given by the right-hand rule. The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor. The magnetic field of a solenoid carrying a current is similar to that of a bar magnet. An electromagnet consists of a core of soft iron wrapped around with a coil of insulated copper wire.
A current-carrying conductor when placed in a magnetic field experiences a force. This is the basis of an electric motor. An electric motor is a device that converts electric energy into mechanical energy. The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with Ncert Exemplar Class 10th Science Pdf Ppt time.
The magnetic field may change due to a relative motion between the coil and a magnet placed near to the coil. If the coil is placed near to a current-carrying conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor.
A generator converts mechanical energy into electrical energy. It works on the basis of electromagnetic induction. In our houses we receive AC electric power of V with a frequency of 50 Hz.
One of the wires in this supply is with red insulation, called live wire. The other one is of black insulation, which is a neutral wire. The potential difference between the two is V.
The third is the earth wire that has green insulation and this is connected to a metallic body deep inside earth. It is used as a safety measure to ensure that any leakage of current to a metallic body does not give any severe shock to a user. Fuse is the most important safety device, used for protecting the circuits due to short-circuiting or overloading of the circuits.
Acid-base indicators are dyes or mixtures of dyes which are used to indicate the presence of acids and bases. Formation of OH� aq ions in solution is responsible for the basic nature of a substance. When Class 10th Ncert Exemplar Science Assessment an acid reacts with a metal, hydrogen gas is evolved and a corresponding salt is formed. When a base reacts with a metal, along with the evolution of hydrogen gas a salt is formed which has a negative ion composed of the metal and oxygen.
When an acid reacts with a metal carbonate or metal hydrogencarbonate, it gives the corresponding salt, carbon dioxide gas and water. Acidic and basic solutions in water conduct electricity because they produce hydrogen and hydroxide ions respectively.
The strength of an acid or an alkali can be tested by using a scale called the pH scale which gives the measure of hydrogen ion concentration in a solution.
A neutral solution has a pH of exactly 7, while an acidic solution has a pH less than 7 and a basic solution a pH more than 7. Living beings carry out their metabolic activities within an optimal pH range. Mixing concentrated acids or bases with water is a highly exothermic process. Acids and bases neutralise each other to form corresponding salts and water.
Water of crystallisation is the fixed number of water molecules chemically attached to each formula unit of a salt in its crystalline form. Salts have various uses in everyday life and in industries.
Students must see Previous Years Board Papers to understand the difficulty of questions. If you are having any suggestion for the improvement, your are welcome. The improvement of the website and its contents are based on your suggestion and feedback.
What are the main points in Chapter 3: Metals and Non � Metals? Explain the keywords of Chapter 6: Life Processes. Notes on Chapter 7: Control and Coordination.
A complete chemical equation represents the reactants, products and their physical states symbolically. A chemical equation is balanced so that the numbers of atoms of each type involved in a chemical reaction are the same on the reactant and product sides of the equation.
Equations must always be balanced. In a combination reaction two or more substances combine to form a new single substance. Decomposition reactions are opposite to combination reactions.
In a decomposition reaction, a single substance decomposes to give two or more substances. Reactions in which heat is given out along with the products are called exothermic reactions. Reactions in which energy is absorbed are known as endothermic reactions.
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