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Write an activity to show that synthetic fibres are stronger than the cotton fibres.
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Which of the following is not a metal?
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Name two soft metals which can be cut with a knife.
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Name two major non-metals which are present in fertilisers and enhance the growth of plants.
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Which of the following metals can displace the other two metals from their salt solutions?
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In the following figure, you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.
- ______ is a metal.
- Metals are good ______ of electricity.
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A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain.
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The underlined word in the following sentence have been jumbled up. Write them in their correct form.
Rineryfe is a place where various fractions of petroleum are separated.
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The process of separating the various constituents of petroleum is known as ______.
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Which one of the following has the highest calorific value?
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Which of the following is not a combustible substance?
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Boojho wants to separate the following materials as combustible and non-combustible. Can you help him?
| Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood. |
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State whether the following statement is True or False.
Magnesium is a non-combustible metal.
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Write True/False against the following statement and also correct the false statement.
Alcohol, CNG and LPG are inflammable substances.
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Cracker on ignition produces sound. Why?
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The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?
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Forest fire produces a lot of air pollution. Write in brief about the reasons of forest fires.
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Why is it important to conserve forests?
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Mention any one action that you have undertaken to conserve trees.
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State whether the following statement is True or False. Correct the false statement.
Plants of a particular area are collectively termed as fauna.
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