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

Section - A

1. What is meant by endothermic process ? Give one example. 1
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2. Name any two elements used for fabrication of solar cells. 1
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3. Who proposed the Big-Bang theory of the origin of Universe. 1
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4. What are strong acids ? Give one example. 1
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5. What is the magnification for a plane mirror ? 1
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6. What is formula of washing soda ? 2
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7. State Coulomb’s law of electric charges ? 2
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8. What is INSAT ? What are its objectives ?

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Give two major objectives of ISRO ? 2
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9. Calculate pH of 0.01 M HC1 if it is fully dissociated. 2
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10. A space shuttle utilises 100 Kg of liquid hydrogen during a flight. If the calorific value of hydrogen is 150 kJ/g, how much energy did it consume ? 2
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11. What are communication satellites ? Why don’t we use moon as a communication satellite ? 3
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12. What is meant by quenching of glass ? What type of glass do we get by this process ?

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Which one of the following reaction equations represents combustion of carbon and why ? Give another example of combustion reaction.
(i) 2C + O₂ ——-> 2CO
(ii) C + O₂ ——> CO₂
(iii) 3C + O₂ —-> 2CO + CO₂. 3

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13. What is electro-plating ? Explain the process with a diagram. Give two real life applications of the process. 3
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14. What is the significance of Oersted’s experiment ? Draw the magnetic field created by a long conductor carrying current. 3
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15. How will you prepare hydrogen gas in laboratory ? Draw a neat and labelled diagram and write chemical reaction involved. How will you test the presence of hydrogen gas ? 3
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