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July 9th, 2014, 01:57 PM
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I am looking here question paper for CBSE board of education Class 10th science subject Examination in a PDF file format ? Here I am giving question paper for CBSE board of education Class 10th science subject Examination in a PDF file attached with it so you an get it easily. 1. A few drops of sulphuric acid are added into water before electrolysis. Why ? 4. The resistance of a resistor is kept constant and the potential difference across its two ends is decreased to half of its former value. State the change that will occur in the current through it. 5. What is an alloy ? Give the composition and one use each of the following : (i) Brass (ii) Solder ŸææÌé 6. Name the product obtained by recrystallisation of sodium carbonate and write its chemical formula. 7. (a) A solution of substance ‘X’ is used for white washing. What is the substance ‘X’ ? State the chemical reaction of ‘X’ with water. (b) Why does the colour of copper sulphate solution change when an iron nail is dipped in it ? (a) 8. (a) Balance the following chemical equations : (i) 9. Stomata of desert plants remain closed during day time. How do they take up carbon dioxide and perform photosynthesis ? 10. What is meant by ‘ocean thermal energy’ ? How can electricity be generated from the ocean energy ? 11. An electric resistor of resistance 20 draws a current of 5A. Calculate the heat produced by it in 30 seconds. Last edited by Anuj Bhola; October 23rd, 2019 at 01:22 PM. |
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