CBSE Board Students Helpline

Themes | Drupal Shared via AddThis

1. What is common to all acids? (1 mark) 2. A white chemical compound becomes hard on mixing proper quantity of water. It is also used in surgery to maintain joins in a fixed position. Name the chemical compound. (1 mark) 3. Name two constituents of baking power. (1 mark) 4. A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical material which he can mix the soil to adjust its pH. (1 mark) 5. Write the pH value, after which teeth start decaying? (1 mark) 6. How is the concentration of hydroxide ions (OH-) affected when excess base is dissolved in a solution of sodium hydroxide? (2 marks) 7. A white substance having a strong smell of chlorine is used to clean water in water storage tank. Identify the substance. Write its chemical name and the reaction for its preparation. (2 marks) 8. How is plaster of Paris obtained? What reaction is involved in the setting of a paste of plaster of Paris. (2 marks) 9. Name the gas evolved when dilute sulphuric acid acts on s

1. What is the chemical name of washing soda ? (1mark) 2. When sodium hydrogen carbonate is added to water, the hydrogen ion concentration decreases.What is the nature of the solution? Acidic or basic? (1mark) 3. Write the chemical name and formula of bleaching powder. (1mark) 4. A milkman adds a very small amount of baking soda to fresh milk. (2 marks) (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline? (b) Why does this milk take a long time to set as curd? 5. Plaster of Paris should be stored in a moisture proof container. Explain why? (2 marks) 6. What is a neutralization reaction? Give two examples. (2 marks) 7. Explain how pH change in the river water can endanger th

http://cbseguess2010.blogspot.com http://sciencehelpline.blogspot.com http://pschelpline.blogspot.com Chapter 14 : Sources of Energy 1. What is that energy called, which is derived f rom the heat inside the earth? (1mark) 2. What do you mean by O. T.E? (1mark) 3. Write down the name of any one source of energy which is not derived directly or indirectly from solar energy. (1mark) 4. Define a nuclear fusion reaction. Describe the conditions for the occurrence of a nuclear fusion reaction. (2marks) 5. Give an ex ample of a nuclear fusion reaction. Describe one method for making such reactions possible. (2marks) 6. Distinguish between renewable and a non-renewable source of energy. (2 marks) 7. What are the adv antages of bio-gas over th e traditional fuels? (2marks) 8. Explain the working of a wind mill. (2marks) 9. Wh y it is not possible to make use of solar cell to meet all our energy needs? State two reasons to support your answer. (2marks) 10. (i)What is bio-gas? How can bio-gas be

Number Systems CBSE Test Papers for class 10 Mathematics. These test papers are provided by the site users and team members. Test Papers includes KV Question Papers, Half yearly Papers Introduction, . Polynomials CBSE Test Papers for class 10 Mathematics. These test papers are provided by the site users and team members. Test Papers includes KV Question Papers, Half yearly Papers and Unit Test Papers and HOTS questions. Following topics are covered Introduction, Geometrical Meaning of the Zeroes of a Polynomial, Relationship between Zeroes and Coefficients of a Polynomial, Division Algorithm for Polynomials. Pair of Linear Equations in Two Variables CBSE Test Papers for class 10 Mathematics. These test papers are provided by the site users and team members. Test Papers includes KV Question Papers, Half yearly Papers Introduction, Pair of Linear Equations in Two Variables, Graphical Method of Solution of a Pair of Linear Equations, Algebraic Methods of Solving a Pair of Linear Equati

Statistics Test Paper 01 Statistics Test Paper 01 as per CBSE syllabus for year 22009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Statistics Test Paper 02 Statistics Test Paper 02 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now FOR CBSE Maths HOTS? Log on Http://cbsekey.com

Surface Areas and Volumes Test Paper 01 Surface Areas and Volumes Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Surface Areas and Volumes Test Paper 02 Surface Areas and Volumes Test Paper 02 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Surface Areas and Volumes Test Paper 03 Surface Areas and Volumes Test Paper 03 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now

Areas Related to Circles Test Paper 01 Areas Related to Circles Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Areas Related to Circles Test Paper 02 Areas Related to Circles Test Paper 02 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Areas Related to Circles Test Paper 03 Areas Related to Circles Test Paper 03 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009. Download Now Areas Related to Circles Test Paper 04 Areas Related to Circles Test Paper 04 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009. Download Now

Areas Related to Circles Test Paper 04 Areas Related to Circles Test Paper 04 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009. Download Now Constructions Test Paper 01 Constructions Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Circles Test Paper 01 Circles Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Similar Triangles Test Paper 01 Similar Triangles Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Co-Ordinate Geometry Test Paper 01 Co-Ordinate Geometry Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 20

Similar Triangles Test Paper 02 Similar Triangles Test Paper 02 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Co-Ordinate Geometry Test Paper 01 Co-Ordinate Geometry Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Trigonometry Test Paper 01 Trigonometry Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Arithmetic Progressions Test Paper 01 Arithmetic Progressions Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now

Pair of Linear Equations in Two Variables Test Paper 01 Pair of Linear Equations in Two Variables Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Pair of Linear Equations in Two Variables Test Paper 02 Pair of Linear Equations in Two Variables Test Paper 02 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Pair of Linear Equations in Two Variables Test Paper 03 Pair of Linear Equations in Two Variables Test Paper 03 for 2009-2010 Download Now Pair of Linear Equations in Two Variables Test Paper 04 Pair of Linear Equations in Two Variables Test Paper 04 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Pair of Linear Equations in Two Variables Test Paper 05 Pair of Linear Equations in Two Variable

Quadratic Equations Test Paper 01 Quadratic Equations Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Quadratic Equations Test Paper 02 Quadratic Equations Test Paper 02 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Quadratic Equations Test Paper 03 Quadratic Equations Test Paper 03 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Quadratic Equations Test Paper 04 Quadratic Equations Test Paper 04 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Quadratic Equations Test Paper 05 Quadratic Equations Test Paper 05 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HO

Polynomials Test Paper 01 Polynomials Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Polynomials Test Paper 02 Polynomials Test Paper 02 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Polynomials Test Paper 03 Polynomials Test Paper 03 as per CBSE syllabus for year 200-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Polynomials Test Paper 04 Polynomials Test Paper 04 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Polynomials Test Paper 05 Polynomials Test Paper 05 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now

Number Systems Test Paper 01 Number Systems Test Paper 01 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Number Systems Test Paper 02 Number Systems Test Paper 02 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Number Systems Test Paper 03 Number Systems Test Paper 03 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Number Systems Test Paper 04 Number Systems Test Paper 04 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download Now Number Systems Test Paper 05 Number Systems Test Paper 05 as per CBSE syllabus for year 2009-2010. Most of these questions are KV HOTS and CBSE HOTS for CBSE Board examinations 2009-2010. Download

Management of Natural Resources Our Environment Sources of Energy Magnetic Effects of Electric Current Electricity Human Eye and Colourful World Light – Reflection and Refraction Heredity and Evolution How do Organisms Reproduce? Control and Coordination Life Processes Periodic Classification Carbon and its Compounds Metals and Non-metals Acids, Bases and Salts Chemical Reactions and Equations

What happens when magnesium ribbon burns in air? What do you mean by physical and chemical change. When do you say that a chemical reaction has taken place? What do you mean by word equation. List four observations that help us to determine whether a chemical reaction has taken place. What do you mean by skeletal equation. Why do we balance a chemical equation? What is hit and trial method of balancing chemical equation? Give two limitation of chemical equation and how can we overcome these limitation. What does the word aq. represent in a chemical equation. What actually happen during a chemical reaction? Why water starts boiling if lime is added to it. The glucose combines with oxygen in our body cells and provides energy. What is the special name of this reaction? According to energy change what type of reaction is decomposition of vegetable matter into compost. Give two precautions you take while decomposition reaction of ferrous sulphate. Is lime natural of man-made substance? Giv

ARITHMETIC PROGRESSIONS AND PAIR OF LINEAR EQUATIONS Number System ARITHMETIC PROGERESSIONS Trignometry COORDINATE GEOMETRY 100 Important question for CBSE Class Tenth Probability Coordinate Geometry Class Tenth 2 Coordinate Geometry Class Tenth cbse test papers 2009-2010 Mathematics Sample papers for 9th 10th 11th 12th Real Numbers Pair of Linear Equations in Two Variables Quadratic Equations Arithmetic Progressions Coordinate Geometry Introduction to Trigonometry Some Applications of Trigonometry Circles C onstructions Areas Related to Circles S urface Areas and Volumes Statistics P robability

CBSE Sample Guess Paper 1 CBSE Sample Guess Paper 2 CBSE Sample Guess Paper 3 CBSE Sample Guess Paper 4 CBSE Sample Guess Paper 5 CBSE Sample Guess Paper 6 CBSE Sample Guess Paper 7 CBSE Sample Guess Paper 8 CBSE Sample Guess Paper 9 CBSE Sample Guess Paper 10

GUESS PAPER 10 – 2009 CLASS – X SUBJECT - MATHEMATICS Time: 3 hours                                                                                                                               M.M:80 General Instructions : All questions are compulsory. The question paper consists of thirty questions divided into four sections A, B, C and D. Section A carries ten q uestions of 1 mark each, section B carries five questions of 2 marks each, section C carries ten questions of 3 marks each and section D carries five questions of 6 marks each. All questions in Section A are to be answered in one word, one sentence or as per the exact requirement of the question. There is no overall choice. However, internal choice has been provided in one question of 2 marks each, three questions of 3 marks each and two questions of 6 marks each. You have to attempt only one of the alternatives in all such questions. In question on construction, drawing sh ould be neat and exactly as per given m easu