Please select a subject first
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High speed wind can cause cyclone in regions of ______ pressure.
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State whether the following statement is True or False:
A very high pressure system, with very high speed wind surrounding it forms a cyclone.
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State whether the following statement is True or False:
The coast line of India is not vulnerable to cyclones
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How are open drains harmful to human health?
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Distinguish between a parasite and a saprotroph.
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Plants which synthesise their food themselves are called saprotrophs.
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The product of photosynthesis is not a protein.
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Solar energy is converted into chemical energy during photosynthesis.
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How will you help your neighbours in case cyclone approaches your village/town?
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What planning is required in advance to deal with the situation created by a cyclone?
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Take three test-tubes. Fill 3/4th of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?
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An image that cannot be obtained on a screen is called ______.
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Image formed by a convex ______ is always virtual and smaller in size.
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An image formed by a ______ mirror is always of the same size as that of the object.
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An image which can be obtained on a screen is called a ______ image.
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We can obtain an enlarged and erect image by a convex mirror.
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We can obtain a real, enlarged and inverted image by a concave mirror.
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A concave mirror always forms a real image.
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Match the items given in Column I with one or more items of Column II.
| Column I | Column II | ||
| (a) | A plane mirror | (i) | Used as a magnifying glass. |
| (b) | A convex mirror | (ii) | Can form image of objects spread over a large area. |
| (c) | A convex lens | (iii) | Used by dentists to see enlarged image of teeth. |
| (d) | A concave mirror | (iv) | The image is always inverted and magnified. |
| (e) | A concave lens | (v) | The image is erect and of the same size as the object. |
| (vi) | The image is erect and smaller in size than the object. |
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Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
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