11). Optic fibres are mainly used for which of the following?
A). Musical instruments |
B). Food industry |
C). Weaving |
D). Communication |
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12). Rayon is chemically
A). cellulose |
B). pectin |
C). glucose |
D). amylase |
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13). Wood is the main raw material for the manufacture of
A). paint |
B). paper |
C). ink |
D). gun powder |
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14). Which of the following is a protein?
A). Natural rubber |
B). Starch |
C). Cellulose |
D). None of these |
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15). Which of the following is used for removing air bubbles from glass during its manufacture?
A). Arsenous oxide |
B). Potassium carbonate |
C). Soda ash |
D). Feldspar |
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16). Soap is a mixture of sodium or potassium salts of
A). dicarboxylic acids |
B). monocarboxylic acids |
C). glycerol |
D). tricarboxylic acids |
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17). Gypsum is added to cement clinker to
A). increase the tensile strength of cement |
B). decrease the rate of setting of cement |
C). facilitate the formation of colloidal gel |
D). bind the particles of calcium silicate |
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18). Paper is manufactured by
A). Wood and resin |
B). Wood, sodium and bleaching powder |
C). Wood, calcium, hydrogen sulphite and resin |
D). Wood and bleaching powder |
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19). The vast resources of unutilised natural gas can be used in the production of
A). graphite |
B). Synthetic petroleum |
C). fertilisers |
D). carbide |
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20). Glass is made of the mixture of
A). quartz and mica |
B). sand and silicates |
C). salt and quartz |
D). sand and salt |
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