» CBSE Science Practice Paper : Set X : CBSE Sample Question Papers

Section - A

1. Write the full form of the following :
(i)ASLV,(ii)ISRO. 1
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2. Define molarity. 1
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3. What happens when CL₂ gas is passed over dry slaked lime ? 1
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4. What are the limitations in harnessing solar energy ? 1
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5. Which glass is used for making wind screen of automobiles ? 1
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6. Why do we need sign convention in optics ? 2
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7. What are superconductors ? Give example. 2
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8. If 20% of uranium is to release energy in a bomb of 0.10 Kg, find energy released in MeV. Given: l MeV=1.6x l0^-13 J and c= 3x 10⁸ ms^-1 2
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9. Classify the following acids and bases in the categories of weak and strong :
(i) H₂SO₄, (ii) CH₃COOH, {iii) HC1O₄, (iv) H₂CO₃. 2
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10. Give two important uses of cement. 2
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11. Show how the nature of image formed by a concave mirror differs for object placed at two positions; (i) between/and pole, (ii) between/and R. 3
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12. A1500 W electric geyser is used for 2 hours everyday. Calculate the number of units of electrical energy that will be consumed in 30 days, If one unit costs Rs. 2, find the amount of the bill ?

OR
A 150 W fan is used for 12 hours a day, a 60 W bulb is used for 8 hours a day, calculate the energy consumed in 28 days. Express it in KWh. 3
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13. What is dispersion ? How and when does it form a spectrum of light ? 3
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14. How much energy will I kg mass of wood yield on complete combustion if its calorific value is 15 kJ/g ? 3
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15. Identify the charges acquired by ebonite rod when rubbed with fur material. What is the reason for it ? Does this obey the law of conservation of charge ? 3
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