Multiple Choice Questions 1. Which one of the following sets of phenomena would show an increase on increasing the temperature? (a) Diffusion, evaporation, compression of gases (b) Evaporation, compression of gases, solubility (c) Evaporation, diffusion, expansion of gases (d) Evaporation, solubility, diffusion, compression of gases
2. Seema visited a Natural Gas Compressing Unit. She found that a gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with her friends, she got confused. Can you help her to identify the correct set of conditions? (a) Low temperature and low pressure (b) High temperature and low pressure (c) Low temperature and high pressure (d) High temperature and high .
3. Fluids have a unique property of flowing. Which of the following statements is correct in this respect? (a) Only gases behave like fluids. (b) Gases and solids - both behave like fluids. (c) Gases and liquids – both behave like fluids. (d) Only liquids are fluids. Ans: .
4. During summers, water kept in an earthen pot becomes cooler after some time. Which phenomenon leads to the cooling of water in an earthen pot? (a) Diffusion (b) Transpiration (c) Osmosis (d)Evaporation .
5. Which of the following represents the correct arrangement of substances arranged in an increasing order of “forces of attraction” between their particles? (a) Water, air, wind. (b) Air, sugar, oil. (c) Oxygen, water, sugar. (d) Salt, juice, air .
6. When converted to Kelvin scale, what will be the correct sequence of the temperatures 25 °C, 38 °C and 66 °C? (a) 298 K, 311 K and 339 K (b) 298 K, 300 K and 338 K (c) 273 K, 278 K and 543 K (d) 298 K, 310 K and 338
7. Choose the correct statement for change of states of matter :- (a) Conversion of solid into vapours without passing through the liquid state is called vaporization. (b) Conversion of vapours into solid without passing through the liquid state is called sublimation. (c) Conversion of vapours into solid without passing through the liquid state is called freezing. (d) Conversion of solid into liquid is called sublimation.
8. Boiling points of diethyl ether, acetone and n-butyl alcohol are 35 °C, 56 °C and 118 °C respectively. Which of the following set correctly represents the boiling points on the Kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 K, 391 K (d) 329 K, 392 K, 308
9. Identify the condition that will increase the evaporation of water? (a) Increase in the temperature of water. (b) Decrease in the temperature of water. (c) Less exposed surface area of water. (d) Adding common salt to water. .
10. Identify the conditions where the distance between the molecules of hydrogen gas will increase? (i)Increasing the pressure on hydrogen gas contained in a closed container. (ii)Leaking some hydrogen out of the container. (iii)Increasing the volume of the container. (iv)Addition of hydrogen gas to the container without increasing the volume of the container.
(a) (i) and (iii) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii) and (iv)
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1. ka evaporation,diffusion, expansion of gases
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1.d) evaporation, solubility, diffusion, compression of gases
2.d) high temperature high pressure
3.c) Gas and liquid - both behave like fluids
4. d) evaporation
5.c) oxygen, water, gas
6.a) 298k, 311k, 339k
7.b) Conversion of vapours into solids without passing through liquid state is called sublimation.
8.c) 308k, 329k, 391k
9.a) Increase in the temperature of water.
10.c) ii and iii
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