CBSE Science Practice Paper : Set V
1. The refractive index of water and glass are 1.33 and 1.5 respectively. Find the refractive index of water with respect to glass. 1
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2. Give one example of slow reaction. 1
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3. What is the role of rods and cones in human eye ? 1
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4. Write reaction of methanal with HCN. 1
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5. Why do we make conductors of heating devices made of an alloy instead of a pure metal ? 1
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6. What happens when calcium hydroxide is treated with chlorine gas ? Give chemical equation. 2
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7. How much solar energy is received in 1 m area in one hour.
Given : Solar constant is 1.4 kW per square metre ? 2
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8. What are primary colours and complementary colours. Give two examples each. 2
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9. Calculate pH of a solution having [H+] = 1.0 x l0-4 mol L-1. State whether the solution is acidic or basic.
N2O4(g)=2NO2, the concentration of [N2O4] = 4.0 x 10-2 mol L-1; [NO2] = 1.5 x 10-2 mol L-1 at equilibrium. Calculate the value of equilibrium constant, 2
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10. Who first found that current can produce magnetic field ? Write the Right hand grip rule to find the direction of magnetic field. 2
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11. A white powdered solid, when added to water produces a hissing sound. Identify the compound. How does this compound react with moist hydrogen chloride gas ? Write the chemical equation. Give two uses of same compound. 3
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12. What is the source of Geothermal energy ? Name the places where this energy is tapped. 3
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13. Metals are electropositive in nature, why ? How are most reactive metals obtained from their ore ? Name the method and give one example of such metal.
What is meant by refining of petroleum ? Name the process used for refining. Give name and uses of products obtained at 180°C and 260°C. 3
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14. What do you mean by summer and winter solstice ? 3
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15. Docs the nature of image formed by a concave mirror depend on the position of an object ? Show this with the help of two ray diagrams. 3
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