Knife is made with
A) Less surface area
B) More surface area
C) Less surface area of contact
D) More surface area of contact
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“Moscow appears much less clean than the other European capitals …………….. ” The above comment was made by
D) Rabindranath Tagore
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If each dimension of a cuboid is increased by 4 times, then the total surface area becomes …………….. times the original area.
Correct option is (D) 16 Let \(l,b\;and\;h\) are length, breadth and height of the original cuboid. After increasing each dimension of cuboid by 4 times, length of formed cuboid \(=4\,l,\) breadth of formed cuboid = 4b and height of formed...
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If each dimension of a cuboid is increased by 4 times, then the total surface area becomes …………….. times the original area.
2 Answers
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Which of the following should be less, so that the top most carnivores will get more energy ?
(B) Trophic levels
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If the area is less, then the value of pressure A) less B) more
Correct option is B) more
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1. (a) Is ammonia more dense or less dense than air? (b) What property of ammonia is demonstrated by the Fountain Experiment? (c) Write the balanced equation for the reaction between ammonia and sulphuric acid. 2. Pick the odd member from the list giving reasons: (a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide. (b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide. 3. Give reasons for the following : (a) Liquid ammonia is used as a refrigerant in ice plants. (b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes. (c) Aqueous solution of ammonia gives a pungent smell. (d) Aqueous solution of ammonia conducts electricity.
(1) (a) ammonia is less dense than air (b) solubility in water (c) 2NH3 + H2SO4 → (NH4)2SO4 (2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides. (b) CuO,...
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A sharp knife can cut food much more easily because A) It produces greater pressure on the food.
A) It produces greater pressure on the food.
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Q. 4. Show the following details with suitable index in the world map given below: (1) Area of high salinity in Atlantic Ocean (2) Area of less salinity near India (3) Dead Sea (4) Baltic Sea (5) Part of Red Sea having less salinity.
37000 32000 34000
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Write whether the following statements are true or false . (i) Communties with more species tend to be more stable that those with less species. (ii)
(i) True (ii) False (iii) True (iv) False
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Two wires are made of the same material and have the same volume. However, wire 1 has cross-sectional area `A` and wire 2 has cross-sectional area `3A
Correct Answer - 9 9
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