1) Which of the following has highest kinetic energy? a) Particles of ice at 0 °C b) Particles of water at 0 °C c) Particles of water at 100 °C d) Particles of steam at 100 °C 2) Under which of the following conditions we can boil water at room temperature? a) (a) At low pressure b) (b) At high pressure c) (c) At very high pressure d) (d) At atmospheric pressure 3) Which of the following does not affect rate of evaporation? a) (a) Wind speed b) (d) Insoluble heavy impurities c) (b) temperature d) (b) Surface area 4) Which one of the following statements is not true? a) (a) The molecules in a solid vibrate about a fixed position b) (b) The molecules in a liquid are arranged in a regular pattern c) (c) The molecules in a gas exert negligibly small forces on each other, except during collisions d) (d) The molecules of a gas occupy all the space available 5) Which one of the following set of phenomena would increase on raising the temperature? a) (a) Diffusion, evaporation, compression of gases b) (b) Evaporation, compression of gases, solubility c) (c)Evaporation, solubility, diffusion, compression of gases d) (c) Evaporation, diffusion, expansion of gases 6) Which of the following phenomena always results in the cooling effect? a) (a) Condensation b) (b) Evaporation c) (c) Sublimation d) (d) None of these 7) Which of the following statement is correct? a) (a) Materials existing as liquids at room temperature have their melting and boiling points lower than that of room temperature. b) (b) The phenomenon involving the transition of a substance from solid to liquid state is called sublimation. c) (c) To convert a temperature on the Celsius scale to Kelvin scale, subtract 273 from the given temperature d) (d) The density of ice is less than that of water. 8) The quantity of matter present in an object is called its: a) (a)Weight b) (b)Gram c) (c)Mass d) (d)Density 9) The boiling point of alcohol is 78oC. What is this temperature in Kelvin scale: a) (a)373 K b) (b)351 K c) (c)375 K d) (d)78 K 10) In which phenomena water changes into water vapour below its B.P.? a) (a)Evaporation b) (b)Condensation c) (c)No such phenomena exist d) (c)Boiling

matter class 9

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