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List any two uses of iron ?
Iron is used to make utensils, tools, machines, cars, buses, railway coaches and railway engines. Iron is heated and melted to produce steel.
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(a) What causes wind? (b) List any two methods of preventing soil erosion.
(a) The air above land gets heated faster and being light, it starts rising up. As the air rises, a region of low pressure is created. As a result, the...
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(a) List any two main feature of chordates. (b) Name the classes of vertebrates which have the following characteristics:
The two main features of chordates are: (a) (i) They have notochord (ii) They are true coelomate animals and triploblastic. (b) (i) Pisces have streamlined body and gills for breathing (ii) Amphibians are found both...
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Explain with examples (i) Atomic number, (ii) Mass number, (iii) Isotopes and (iv) Isobars. Give any two uses of isotopes
(i) Atomic number The atomic number of an element is the total number of protons present in the atom of that element. For example, nitrogen has 7 protons in its atom....
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State two positions in which a concave mirror produces a magnified image of a given object. List two differences between the two images.
A concave mirror produces a magnified image when the object is placed in front of the mirror: (i) between its pole and focus (ii) between the focus and centre of curvature In case (i) the...
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Choose the renewable sources of energy from the following list. Coal, biogas, Sun, natural gas
Sun and biogas.
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Why are bacteria and fungi called decomposers? List any two advantages of decomposers to the environment.
Bacteria and fungi are called decomposers because bacteria and fungi break down the dead and decaying organic matter into simpler substances and provide the nutrients back to the soil. Advantages of...
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List any two causes for the failure of sustained availability of ground water.
(i) Loss of vegetation cover. (ii) Diversion for high water-demanding crops. (iii) Pollution from industrial effluents. (iv) Dumping of urban waste. (Any two)
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List any two observations when a highly reactive metal is dropped in water.
(i) Large amount of heat is evolved. (ii) Metal starts floating.
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List any three parameters, which categorizes any source of energy as a good source of energy
(i) Available in enormous amount in nature all the time. (ii) Easy to store and transport. (iii) It should be economical and easily accessible.
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