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Q 1.
Which layer in our atmosphere protects us from the harmful ultraviolet radiation which comes from sun?
Ans.
Ozone.
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Q 2.
Which substance is formed by mixing magnesium oxide with water?
Ans.
Magnesium hydroxide.
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Q 3.
Which substance is formed on burning of Magnesium?
Ans.
Magnesium oxide.
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Q 4.
In which substance changes are reversible?
Ans.
Physical change.
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Q 5.
A change in which a substance undergo a change in its shape, size and colour is called?
Ans.
Physical change.
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Q 6.
Crystallisation is the example of?
Ans.
Physical change.
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Q 7.
Define Galvanisation?
Ans.
Process of depositing a layer of zinc on iron is called galvanisation.
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Q 8.
Name the essential element of rustig?
Ans.
Oxygen and water.
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Q 9.
Name the methods by which rushing of iron can be prevented?
Ans.
1.Greasing
2.Painting. |
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Q 10.
Name the process of depositing layer of zinc on iron is called?
Ans.
Galvanisation.
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Q 11.
Name the gas which turns lime water milky?
Ans.
Carbon dioxide.
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Q 12.
Examples of both physical and chemical changes?
Ans.
1.Glowing of bulb with the help of dry cell.
2.Burning of candle. |
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Q 13.
Name the gas released when baking soda is mixed with lemon juice?
Ans.
Carbon dioxide.
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Q 14.
In which new substance are formed when there is any change in it?
Ans.
Chemical change.
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Q 15.
Chemical name of baking soda?
Ans.
Sodium hydrogen carbonate.
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Q 16.
When carbon dioxide is passed through lime water, it turns milky due to?
Ans.
The formation of calcium carbonate.
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Q 17.
Dissolving salt in water is what change?
Ans.
Physical change.
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Q 18.
Burning of coal is which change?
Ans.
Chemical change.
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