Choose the correct option: |
(i) The passage of an electric current through a conducting liquid causes: |
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(ii) Angle of incidence is equal to the angle of reflection: |
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(iii) An agricultural implement used since ancient times for tilling the soil, adding fertilisers, removing weeds etc. is: |
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(iv) Carrier of malaria - causing protozoan is: |
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(v) This bacterium promotes the formation of milk into curd |
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(vi) Which is not made from nylon? |
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(vii) Some metals react with bases to produce gas |
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(viii) Which is not an exhaustible natural resource? |
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(ix) Which of the following is not a combustible substance? |
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(x) In our country, large patches of forests are being cleared for cultivation of crops. The environmental impact of such a practice will lead to: |
(a) All the metals are malleable and ductile except few. Which are those metals (neither malleable nor ductile). |
(b) Metals are used for making electric wires. Name at least one metal and why these metals are used in making electric wires. |
Give reason: |
Treaded tyres are used in cars, trucks and bulldozers |
Write a short note on: |
(i) Useful micro-organisms. |
(ii) Harmful micro-organisms. |
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