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STD 5 Science set 3

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1) Proportion of oxygen in sea water by mass is _____

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2) Metal used as catalyst during hydrogenation of oil is -

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3) VIBGYOR is a -

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4) What happens when zinc is made to dissolve in hydrochloric acid?

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5) Which of the following gases is the most abundant in universe?

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6) Oxygen is collected by downward displacement because _______

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7) ------> Is a _______ of light .

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8) A catalyst -

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9) Light can travel in

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10) A shadow shows -

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11) The gas which smells like rotten eggs is formed when the reaction takes place between -

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12) The reason hydrogen gas is seen as alternate source of energy in industries and automobiles -

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13) 2Mg+O2->2Mgo+heat+light is a ______

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14) Which of the following is a translucent material?

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15) Objects that do not allow light to pass through them are called -

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16) Which of the following gases is used for welding of metals which burn at a temperature of 2800 degree Celsius?

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17) Which of the following is used as catalyst during the preparation of oxygen in laboratory?

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18) Gas released when fuels are burnt in oxygen -

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19) Light is a form of energy that causes the sensation of -

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20) Elements like potassium and sodium are not used for reactions with HCL in laboratory preparation of hydrogen. Why ?

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21) The gas used in the manufacture of nitric acid is ______

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22) An ordinary white light is a combination of ____ colours.

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23) Who showed that an ordinary white light is made up of seven colours?

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24) 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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25) When the moon comes directly between the sun and the earth , the eclipse formed is

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