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CBSE › Class 7 › Science › Changes Around Us: Physical and Chemical (Class 7 NCERT New)
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1. The shipping industry has to bear huge financial losses because of rusting of ships.The rusting of ships occurs because:

2. Expansion and contraction of metals is a:

3. Hydrochloric acid is added to a beaker containing a piece of zinc. Zinc chloride is formed and hydrogen gas is released.This is an example of:

4. Atmospheric pollution

5. Galvanisation

6. This metal is used as protective layer to prevent rusting in the process of galvanisation

7. A + B C + D Which type of reaction is this?

8. Burning of camphor is similar to

9. Rust is

10. Depositing one metal on another metal is

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