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1) A reaction in which liquid freezes and its solid form changes into liquid at same temperature, is called a. dual side reaction b. dual side process c. reversible reaction d. reversible process
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2) Cooking food is an example of a. condensation reaction b. exothermic reaction c. reversible reaction d. endothermic reaction
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3) The freezing point of water is a. 0 °C b. 1 °C c. 100 °C d. 50 °C
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4) Polyethene is a. good conductor of heat b. good conductor of electricity c. poor insulator of electricity d. good insulator of electricity
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5) The varnish which was originally developed for coating the spars of sailing ships is called a. spar varnish b. brown varnish c. yellow varnish d. blue varnish
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6) The least kinetic energy is found in a. solids only b. liquids only c. gases only d. metals only
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7) Plastics are made up of a. small molecules b. small atoms c. large atoms d. large molecules
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8) In chemical reactions, energy is absorbed or released in the form of a. sound b. light c. electricity d. heat
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9) Chemical reactions are a. reversible b. irreversible c. permanent d. temporary
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10) Polyethene is used to make a. furniture b. cooking utensils c. plastic bags d. decorative items
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11) Nitrogen is obtained from a. gaseous air b. liquefied air c. solidified air d. air spaces in soil
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12) The reason of low density of gases is a. number of particles per unit area b. number of particles per unit volume c. mass per unit area d. mass per unit volume
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13) The reaction that gives out heat, while taking place is known as a. exothermic reaction b. endothermic reaction c. reversible reaction d. substitution reaction
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14) The 'volume' of gases is a. indefinite b. definite c. dependent d. reduced
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15) The compounds made up of hydrogen and carbon are known as a. carbohydrates b. hydrocarbons c. alkanes d. alkenes
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16) The gases that required to manufacture 'PVC' are a. methane and chlorine b. ethene and chlorine c. methane, ethene and chlorine d. propane, oxygen and chlorine
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17) The water melts and freezes at a. different temperatures b. different pressure c. same temperature d. same pressure
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18) The force of attraction between particles of gases is a. weaker than liquids but stronger than solids b. weaker than liquids and solids both c. stronger than solids but weaker than gases d. stronger than solids and liquids both
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19) Bakelite' is used to a. insulate heater handles b. increase heat conductivity c. increase electrical conductivity d. insulate electrical equipment
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20) The speed of particles is fastest in a. solids b. liquids c. gases d. fluids
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