11). Optic fibres are mainly used for which of the following?
| A). Musical instruments |
| B). Food industry |
| C). Weaving |
| D). Communication |
|
12). Rayon is chemically
| A). cellulose |
| B). pectin |
| C). glucose |
| D). amylase |
|
13). Wood is the main raw material for the manufacture of
| A). paint |
| B). paper |
| C). ink |
| D). gun powder |
|
14). Which of the following is a protein?
| A). Natural rubber |
| B). Starch |
| C). Cellulose |
| D). None of these |
|
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 |
|
16). Soap is a mixture of sodium or potassium salts of
| A). dicarboxylic acids |
| B). monocarboxylic acids |
| C). glycerol |
| D). tricarboxylic acids |
|
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 |
|
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 |
|
19). The vast resources of unutilised natural gas can be used in the production of
| A). graphite |
| B). Synthetic petroleum |
| C). fertilisers |
| D). carbide |
|
20). Glass is made of the mixture of
| A). quartz and mica |
| B). sand and silicates |
| C). salt and quartz |
| D). sand and salt |
|
