Questions 1 to 4 are one mark questions. These are to be answered in one word or one sentence. Section A |
1. State the chemical change that takes place when lime stone is heated strongly. |
2. .Why do silver articles become black after some time when exposed to air ? |
3. Name the device which directly converts solar energy into electrical energy. |
4. What are amphoteric oxides ? Choose the amphoteric oxides amongst the following oxides. Na2O, ZnO, Al2O3, CO2, H2O |
Questions 5 to 13 are two marks questions. These are to be answered in about 30 words each. |
5. Draw circuit symbols of the following components : (i) Variable resistance or rheostat |
(ii) Plug key or switch (closed) |
6. What are antacids ? Name two compounds which are used as antacids. |
7. A small amount of ferrous sulphate crystals were heated in a hard glass test tube ? (i) Write the equations involved in the above reaction (ii) Name the type of reaction that takes/ place ? |
8. A white salt on heating decomposes to give brown fumes and a residue is left behind. (i) Name the salt. (ii) Write the equation for the decomposition reaction. |
9. Out of two solar cookers one was covered by a plane glass slab and the other was left open. Which of two solar cookers will be more efficient and why ? |
10. A wire of resistance R is cut into three equal parts. (i) Find the value of resistance of each part in terms of the original resistance R ? (ii) If these three pieces are connected in parallel, what is the ratio of the equivalant resistance so obtained with the original resistance ? |
11. How does the strength of the Magnetic field at the centre of a circular coil of a wire depend on : (a) radius of the coil (b) number of turns in the coil |
12. State Ohm’s law and write the condition in which this law is obeyed ? |
13. (a) What happens when quick lime is added to water ? (b) Write chemical equation for the above reaction. (c) Which type of reaction is this? |
Questions 14 to 22 are three marks questions. These are to be answered in about 50 words each |
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18 September 2012
CBSE Class X Science Sample Papers for 2013 Examination
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SCIENCE X : Sample Question Papers (March 2013)
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