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(i) Sulphurous acid turns blue litmus paper into: |
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(ii) Petroleum was formed from organisms: |
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(iii) In villages, people use wood as fuel because |
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(iv) What do black buck, elephant, python and golden cat together represent in a forest? |
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(v) Which one of the following terms is not a part of the nucleus? |
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(vi) Reproduction by budding takes place in |
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(vii) For the metamorphosis of tadpoles; which of the following elements must be available in water? |
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(viii) Which one of the following forces is a contact force? |
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(ix) To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable? |
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(x) An electric current can produce |
Give reason: |
(i) Sulphuric acid is poured on copper plate. |
(ii) Write word equation of the reaction involved. |
Give reason: |
Water is not used to control the fire involving electrical appliances or equipment. |
Once in a village, there was a fire in a hut. When a lot of dry powder of a substance, A was released over the fire, the fire got extinguished. |
(i) Name the substance A. |
(ii) How does the substance extinguished fire? |
(iii) Give another substance which behaves like substance A. |
Give reason. |
Sportsmen use shoes with spikes. |
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