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

Section - A

1. Write the nature of image formed by a plane mirror. 1
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2. Give one example of fast reaction. 1
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3. What do you mean by conventional current flow ? 1
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4. What is meant by esterification ? 1
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5. In what form does heat get transmitted in solar energy ? 1
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6. Express the average rate of reaction in terms of reactants and products for the following reaction : H₂(g) + l₂(g) ——>2HI(g). 2
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7. Name the products we get when a-particle hits a nitrogen nuclei.

OR
Complete the reaction giving reason :
₇N¹⁴ + ₂He⁴ ——>……….+ ₁H¹ 2
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8. What is persistence of vision ? How does this help in motion-picture projection ? 2
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9. Define the term ‘fuel1. What are primary and secondary fuels. ? To which classes of fuel do the following fuels belong :
Coke, Wood, Petroleum, LPG. 2
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10. Define the term electrolysis. Mention two uses in real life. 2
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11. What happens when lime stone is heated strongly ? Write the chemical equation. Give one use of lime stone. 3
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12. What is Nuclear fusion ? Explain with an example. 3
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13. Name the alloys which are used for following purpose, Give their composition :
(i) for soldering joints (ii) for making windows and door fittings (iii) for making equipment for feed and diary industry (iv) for making air crafts and kitchen ware. 3
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14. Define the following : (i) Launch vehicle, (ii) Polar orbits, (iii) Geostationary orbit. 3
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15. Draw a neat labelled diagram of a box-type solar cooker. Give reason for the use of black surface and reflector.

OR
Give reasons for the following events :
(0 Twinkling of stars, (ii) Mirage. 3
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