STD 5 Science set 3
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1) Which of the following gases is used for welding of metals which burn at a temperature of 2800 degree Celsius?
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2) Which of the following is a translucent material?
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3) The gas used in the manufacture of nitric acid is ______
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4) ------> Is a _______ of light .
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5) Light is a form of energy that causes the sensation of -
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6) Which of the following is used as catalyst during the preparation of oxygen in laboratory?
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7) Elements like potassium and sodium are not used for reactions with HCL in laboratory preparation of hydrogen. Why ?
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8) The reason hydrogen gas is seen as alternate source of energy in industries and automobiles -
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9) Gas released when fuels are burnt in oxygen -
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10) Proportion of oxygen in sea water by mass is _____
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11) A catalyst -
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12) Oxygen is collected by downward displacement because _______
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13) Arun kept an iron rod on his terrace. After some days he sees that the rod is covered with reddish - brown powder. What could be the reason for it ?
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14) Which of the following gases is the most abundant in universe?
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15) A shadow shows -
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16) VIBGYOR is a -
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17) When the moon comes directly between the sun and the earth , the eclipse formed is
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18) The gas which smells like rotten eggs is formed when the reaction takes place between -
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19) Metal used as catalyst during hydrogenation of oil is -
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20) 2Mg+O2->2Mgo+heat+light is a ______
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21) Light can travel in
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22) Objects that do not allow light to pass through them are called -
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23) An ordinary white light is a combination of ____ colours.
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24) Who showed that an ordinary white light is made up of seven colours?
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25) What happens when zinc is made to dissolve in hydrochloric acid?
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