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Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
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Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Concept: undefined >> undefined
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Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
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Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
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Give some examples of the Tyndall effect observed in your surroundings?
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Give some examples of the Tyndall effect observed in your surroundings?
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Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
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Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
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A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case
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An earthquake produces which kind of sound before the mainshock wave begins
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The sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given the speed of sound = 340 m s–1.)
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Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?
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Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound. Mark the position of compression and rarefaction on this curve. Also, define wavelengths and time periods using this curve.
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If there were no atmosphere around the earth, the temperature of the earth will
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One of the following factors does not lead to soil formation in nature
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The growth of Lichens on barren rocks is followed by the growth of
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Why do people love to fly kites near the seashore?
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Why are root nodules useful for plants?
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Which one is an oil yielding plant among the following?
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