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Class 10 CBSE 10th Board 2010 : Science

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Surya Ambedkar
DLW Inter College, Varanasi, Varanasi
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http://www.cbseguess.com/ Sample Paper 2010 Class X Subject SCIENCE SECTION-A 1. Why does an aqueous solution of acid conduct electricity? 2. What type of reaction is the one that follows: CaCO3 (s) CaO (s) + CO2 (g) 3. Give structural formulae of the simplest (i) alkene, and (ii) alkyne. 4. What is variable resistance? Which device is used to change resistance in a circuit? 5. What is the magnitude of the induced current in the circular loop PQRS of radius r as shown in figure below, if the straight wire AB causes a current of magnitude I ampere? 6. Which of the following lenses would you prefer to use while reading small letters found in a dictionary? (a) A convex lens of focal length 50 cm (b) A concave lens of focal length 50 cm (c) A convex lens of focal length 5 cm (d) A concave lens of focal length 5 cm 7. On the basis of the atomic structure, how the first and the last element of a period in the periodic table is determined? 8. (i) Distinguish between: (Give chemical reactions) (a) Esterification and Saponification. (b) Oxidation and Combustion. (ii) Give an industrial application of addition reaction. 9. Two wires A and B of the same metal have the same area of cross-section and have their lengths in the ratio 2:1. What will be the ratio of currents flowing through them when same potential difference is applied across length of each of the wire? 10. An object is placed at a distance of 25 cm from a spherical mirror and its image is formed behind the mirror at a distance of 5 cm. Find the focal length of the mirror. Is the mirror concave or convex in nature? Give one use of identified mirror. 11. Watching the sunset on a beach, one can see the sun for two minutes after it has actually set, explain. 12. (a) A 16 Q resistance wire is doubled on it. Calculate the new resistance of the wire. (b) An electron enters a magnetic field at right angles to it as shown in the figure alongside. Determine the direction of force acting on the electron whether on the page or out of the page. 13. Convert the following statement into balanced chemical equations. (a) Hydrogen gas combines with nitrogen to form ammonia. ------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com

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