STD 5 Science set 2
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1) Sun light takes _____ to reach.
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2) Which of the following cases proves that light travels in straight line?
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3) A shadow is formed when _____ object obstructs the path of light.
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4) Which layer of the atmosphere is closest to the surface of the earth?
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5) Which gas is needed for burning?
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6) In which layer of the atmosphere is the ozone layer found?
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7) Paheli observed the shadow of a tree at 8:00a.m., 12:00 noon and 3:00 p.m. which of the following statements is closest to her observation about the shape and size of the shadow?
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8) Incomplete burning of petrol or diesel in vehicles creates _____ gas which is very poisonous.
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9) Which of the following is/are not always necessary to observe a shadow?
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10) Which of the following is the effect of shadows ?
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11) A greenhouse gas that absorbs energy and maintains earth's temperature is :
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12) Which gas is primarily responsible for green house effect i.e., global warming?
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13) The control centre of human body is ____.
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14) Raghav placed his red coloured teddy bear and passed a beam of light. What would be his observations related to the shadow?
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15) Which gas out of the following is found highest by volume in air ?
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16) Which instrument is used to measure atmospheric pressure?
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17) Which layer of the atmosphere merges with the space?
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18) The Taj Mahal is said to be suffering from "Marble Cancer". What is Marble Cancer?
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19) Pinhole camera works on the principle of ______
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20) What is the percentage of nitrogen in the atmosphere?
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21) Water fit for drinking is called ?
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22) Which layer of the atmosphere absorbs the ultraviolet radiation from the sun?
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23) Which of the following are the results of rectilinear propagation of light?
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24) Nature and size of the object depend upon -
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25) Which of the following is a true statement?
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