CBSE Board Students Helpline

Real Numbers Euclid's division lemma, Fundamental Theorem of Arithmetic - statements after reviewing work done earlier and after illustrating and motivating through examples, Proofs of results -irrationality of √2, √3, √5, decimal expansions of rational numbers in terms of terminating/non-terminating recurring decimals. Polynomials Zeros of a polynomial. Relationship between zeros and coefficients of a polynomial with particular reference to quadratic polynomials. Statement and simple problems on division algorithm for polynomials with real coefficients. Pair of Linear Equations in Two Variables Pair of linear equations in two variables. Geometric representation of different possibilities of solutions/inconsistency. Algebraic conditions for number of solutions. Solution of pair of linear equations in two variables algebraically - by substitution, by elimination and by cross multiplication. Simple situational problems must be included. Simple problems on equations reducible to line...

Chemical Reactions and Equations Chemical equations and their balancing, Types of chemical reactions: combination, decomposition, displacement, double displacement, oxidation and reduction, corrosion, rancidity. Acids, Bases and Salts Chemical properties of acids and based, H+ and OH- ions, Neutralisation reactions, pH, salts like common salt, sodium hydroxide, bleaching powder, washing soda, plaster of Paris. Metals and Non-metals Metals-physical and chemical properties, the reactivity series, Non-metals-physical and chemical properties, Ionic compounds, occurrence and extraction of metals, corrosion. Carbon and its Compounds Bonding in Carbon-The Covalent bond Allotropes of Carbon, Versatile nature of carbon Saturated and unsaturated carbon compounds-chains, branches and rings, Homologous series, Nomenclature and Chemical properties of Carbon compounds, Important carbon Compounds (ethanol, ethanoic acid) and their properties Soaps and detergents. Periodic Classification of Elements E...

1. A reaction takes place with the absorption of heat energy. What is this reaction called? (1 mark) 2. Name 2 anti-oxidants used in fat & oil containing foods to prevent rancidity. (1 mark) 3.What is chemical equation? (1 mark) 4. Calcium oxide reacts with water to form calcium hydroxide. Name chemical reaction? (1 mark) 5. Why the colour of copper sulphate solution change when an iron nail is dipped in it? (2 marks) 6. Identify the substance that are oxidized and the substances which are reduced in the following reactions. (2 marks)(i)4Na (s) + O2 (g) ----> 2Na2 O (s)(ii)CuO (s) + H2 (g) ---> Cu (s) + H2O (l) 7. What is a balanced chemical equation? Why should chemical equations be balanced? (2 marks) 8. Why is respiration considered an exothermic reaction? Explain. (2 marks) 9. “Write the balanced chemical equations for the following and identify the type of reaction in each case: (3 marks)(i) Barium chloride (aq) + potassium sulphate (aq) ----> Barium sulphate (s) + Po...

 CBSE Test Papers for Class 10 Economics Description: CBSE Test Papers for Class 10 Economics, Social Science. All the chapters are included here. Students are advised to check the relevancy before using them. Version: Filesize: 0 bytes Added on: 23-Feb-2009 Downloads: 252 HomePage | Rate Resource | Details   CBSE Test Papers for Class 10 Geography Description: CBSE Test Papers for Class 10 Geography, Social Science. All the chapters are included here. Students are advised to check the relevancy before using them. Version: Filesize: 0 bytes Added on: 23-Feb-2009 Downloads: 170 HomePage | Rate Resource | Details   CBSE Test Papers for Class 10 Civics Description: CBSE Test Papers for Class 10 Civics, Social Science. All the chapters are included here. Students are advised to check the relevancy before using them. Version: Filesize: 0 bytes Added on: 23-Feb-2009 Downloads: 113 HomePage | Rate Resource | Details   CBSE Test Papers for Class 10 History Description: CBSE ...

CBSE Test Papers for Class 10 Economics Description: CBSE Test Papers for Class 10 Economics, Social Science. All the chapters are included here. Students are advised to check the relevancy before using them. CBSE Test Papers for Class 10 Geography Description: CBSE Test Papers for Class 10 Geography, Social Science. All the chapters are included here. Students are advised to check the relevancy before using them. CBSE Test Papers for Class 10 Civics Description: CBSE Test Papers for Class 10 Civics, Social Science. All the chapters are included here. Students are advised to check the relevancy before using them. CBSE Test Papers for Class 10 History Description: CBSE Test Papers for Class 10 History, Social Science. All the chapters are included here. Students are advised to check the relevancy before using them.

English A CBSE Test Papers for Class X English Communicative (Course A). These test papers have been given section-wise. Test Papers based on latest syllabus for Reading, Writing, Grammar and Literature can be downloaded for free of cost. Visit the link above to download CBSE Test Papers for Class 10 Englsih Communicative. English B CBSE Test Papers for class X English Language and Literature (Course B) Mathematics  CBSE Test Papers for Class X Mathematics. These test papers have been given Chapter-wise. Test Papers based on latest syllabus for the following topics can be downloaded for free of cost. Real Numbers , Polynomials , Pair of Linear Equations in Two Variables , Quadratic Equations , Arithmetic Progressions , Triangles, Coordinate Geometry , Introduction to Trigonometry , Some Applications of Trigonometry, Circles, Constructions, Areas Related to Circles, Surface Areas and Volumes, Statistics and Probability . Science and Technology  CBSE Test Papers for Class X Scie...