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What is rust ? Give the equation for for...

What is rust ? Give the equation for formation of rust .

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SURA PUBLICATION-HALF YEARLY MODEL QUESTION PAPER-Subjective Questions
  1. Distinguish between linear and areal or superficial expansion.

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  2. Why does sound travel faster on a rainy day than on a dry day?

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  3. What is rust ? Give the equation for formation of rust .

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  4. Lemon juice has a pH 2, what is the concentration of H^(+) ions?

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  5. How is ethanoic acid prepared from ethanol? Give the chemical equation...

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  6. What are the structures involved in the protection of brain?

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  7. What are psychotropic drugs ?

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  8. How are e-wastes generated?

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  9. A cricket ball of mass 25 g moving with a speed of 12 ms^(-1) is hit b...

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  10. Define moment of a couple.

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  11. (i) Differentiate convex lens and concave lens. (ii) What is meant b...

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  12. Define electric potential and potential difference.

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  13. Calculate the number of molecules in 11 g of CO(2)

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  14. Write notes on (i) Saturated solution. (ii) Unsaturated solution.

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  15. Define rate of reaction.

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  16. A plant hormone was first discovered in Japan when rice plant were suf...

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  17. A pure tall plant (TT)is crossed with pure dwarf plant (tt),What would...

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  18. Arun was playing in the garden. Suddenly he saw a dragon fly sitting o...

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  19. The ratio of masses of two planets is 2:3 and the ratio of their radi...

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  20. (i) What are the concepts prepared by Galileo? (ii) List any five pr...

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