Matter in Our Surroundings
Class: 9 | Chapter: 1
Multiple Choice Questions
1. Diffusion is possible in(a) liquid
(b) solid
(c) gas
(d) all of these
2. Intermixing of two different materials by themselves is called
(a) fusion
(b) sublimation
(c) diffusion
(d) vaporization
3. The device which is used for measuring the temperature is called
(a) barometer
(b) thermometer
(c) stethoscope
(d) ammeter
4. Lowest compression occurs
(a) in solids
(b) in liquids
(c) in gases
(d) in solids and liquids
5. Among air,water,cotton and iron,which has highest density
(a)air
(b)water
(c) iron
(d)cotton
6. A substance has a definite volume but not definite shape is
(a)solid
(b)liquid
(c) gas
(d) all of these
7. The change from vapour to liquid is called
(a) condensation
(b) regelation
(c) sublimation
(d) fusion
8. The boiling point of water is
(a) 273 K
(b) 373 K
(c) 283 K
(d) 263 K
9. Definite size is
(a) of solid
(b) of liquid
(c) of gas
(d) none of these
10. CNG is a
(a) solid
(b) liquid
(c) gas
(d)solution
11. Which of the following phenomena would increase on raising 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
12. The property of flow is unique to fluids. Which one of the following statements is correct ?
(a) Only gases behave like fluids
(b) Gases and solids behave like fluids
(c) Gases and liquids behave like fluids
(d) Only liquids are fluids
13. During summer, water kept in an earthen pot becomes cool because of the phenomenon of
(a) diffusion
(b) transpiration
(c) osmosis
(d) evaporation
14. Which condition out of the following will increase the evaporation of water ?
(a) Increase in temperature of water
(b) Decrease in temperature of water
(c) Less exposed surface area of water
(d) Adding common salt to water
15. The boiling point of water at sea level is
(a) 0°C
(b) 273 K
(c) 373 K
(d) 273°C
16. Which of the following has the strongest interparticle forces at room temperature ?
(a) Oxygen
(b) Water
(c) Bromine
(d) Iron
17. Which of the following conditions is most favourable for converting a gas into a liquid ?
(a) High pressure, low temperature
(b) Low pressure, low temperature
(c) Low pressure, high temperature
(d) High pressure, high temperature
18. Dry ice is
(a) water in solid state
(b) water in gaseous state
(c) CO2 in liquid state
(d) CO2 in solid state
19. Which of the following gases can be liquefied when pressure is applied at room temperature ?
(a) Oxygen
(b) Ammonia
(c) Hydrogen
(d) Nitrogen
20. In which of the following substances the molecules possess maximum kinetic energy under normal conditions ?
(a) Sugar
(b) Sulphur powder
(c) Ammonium Chloride
(d) Common Salt
21. When common salt is added to water, its boiling point increases by 20℃. What would be the boiling point of that salt water in Kelvin scale ?
(a) 393 K
(b) 273 K
(c) 373 K
(d) 120 K
22. The boiling point of alcohol is 78℃ and its freezing point is – 114℃. At what temperature does alcohol undergo evaporation ?
(a) 124 K
(b) 159 K
(c) 321 K
(d) 373 K
23. What is the phenomenon involved in a lawn becoming wet in the morning during winter ?
(a) Vaporisation
(b) Liquefaction
(c) Condensation
(d) Deposition
24. Identify the water temperature which gets cooled at the maximum rate ?
(a) Water at 100℃
(b) Water at 80℃
(c) Water at 70℃
(d) Water at 50℃
25. Which substance has the most ordered arrangement of molecules under normal conditions ?
(a) Chlorine
(b) Mercury
(c) Gold
(d) Bromine
26. Gases do not have-
(a) high compressibility
(b) large volume
(c) high fluidity
(d) high density
27. A solid is subjected to heating. The molecules formed were immediately diffused into air. It concludes that
(a) the solid has maximum forces of attraction between the molecules
(b) the melting point of the solid is close to room temperature
(c) the solid is a sublimable substance
(d) the substance obtained has molecules which possess only vibratory motion.
28. 'Panch Tatva' of life
(a) Air, god, water, mother, father
(b) Air, fire, earth, sky, water
(c) Air, god, water, soil, crop
(d) Air, god, water, yield, money
29. Particles are moving in the bottom of the glass due to
(a) Dilution
(b) Dissolution
(c) Kinetic energy
(d) Potential energy
30. Solid have
(a) Negligible compatiblity
(b) Negligible compressibility
(c) Negligible volume
(d) Negligible shape
31. Liquids have no fixes shape but have
(a) Fixed velocity
(b) Fixed value
(c) Fixed temperature
(d) Fixed volume
32. Solids and liquids diffuse into
(a) Liquor
(b) Liquid
(c) Gas
(d) Air
33. The gaseous from the atmosphere diffuse and dissolve in
(a) Water
(b) Gas
(c) Air
(d) Solid
34. ----- and ----- gaseous are essential for the survival of aquatic animals and plants.
(a) Hydrogen, oxygen
(b) Carbondioxide, nitrogen
(c) Oxygen, water
(d) Carbondioxide, oxygen
35. The rate of diffusion of liquids is higher than
(a) Soil
(b) Liquid
(c) Gas
(d) Solids
36. Example of highly compressible gas used for humans need.
(a) LPG
(b) CNG
(c) Only LPG
(d) LPG and CNG
37. The amount of the heat energy required to change 1kg of solid into liquid at atmospheric pressure at its melting point is known as
(a) Fission of heat
(b) Fusion of heat
(c) Latent heat of fusion
(d) Latent heat of fission
38. Water at 0 degree Celsius showing temperature at
(a) 274 K
(b) 273 K
(c) 277 K
(d) 275 K
39. A change of state directly from solid to gas without changing into liquid state is called
(a) Sublimation
(b) Solidification
(c) Gasification
(d) Crystallization
40. Solid carbon dioxide store under
(a) high temperature
(b) high volume
(c) high pressure
(d) low temperature
41. 1 atmosphere is equal to
(a) 1.01 X 105 Pa
(b) 1.01 X X104 Pa
(c) 1.01 X 108 pa
(d) 1.01 X 109 Pa
42. Evaporation is ----- phenomena.
(a) Adsorption
(b) Absorption
(c) Surface
(d) Vapors
43. Rate of evaporation does not increases with
(a) Increase of surface area
(b) Increase in humidity
(c) Increase in temperature
(d) increase in wind speed
44. Heat energy equals to
(a) Latent heat of vaporization is absorbed from the body
(b) 1 kelvin of water
(c) 100 degree
(d) 1 joule of energy
45. Pressure of air in atmosphere is called
(a) Surface pressure
(b) Atmospheric pressure
(c) Surface tension
(d) Sublimation
46. Pa is the SI unit of ----- called as -----
(a) Pressure, pasteurize
(b) Pressure, pascal
(c) Pressure, pacal
(d) Pressure, joule
47. CO2 can be easily liquified and even solidified because
(a) It has weak forces of attraction
(b) It has comparatively more force of attraction than other gases
(c) It has more intermolecular space
(d) It is present in atmosphere
48. Bose-Einstein Condensate have
(a) Very low kinetic energy
(b) Low kinetic energy
(c) High kinetic energy
(d) Highest kinetic energy
49. Which of the following is most suitable for summer ?
(a) Cotton
(b) Nylon
(c) Polyester
(d) Silk
50. The colour of vapours formed on sublimation of iodine solid is
(a) Purple (violet)
(b) Colourless
(c) Yellow
(d) Orange
51. Under which of the following conditions we can boil water at room temperature ?
(a) At low pressure
(b) At high pressure
(c) At very high pressure
(d) At atmospheric pressure
52. Which of the following is not endothermic process ?
(a) Fusion
(b) Vapourisation
(c) Temperature
(d) Insoluble heavy impurities
53. Which of the following does not affect rate of evaporation ?
(a) Wind speed
(b) Surface area
(c) Temperature
(d) Insoluble heavy impurities
54. Kinetic energy of molecules is directly proportional to
(a) Temperature
(b) Pressure
(c) Both (a) and (b)
(d) Atmospheric pressure
55. Which of the following is incorrect about plasma ?
(a) Fluorescent tube and neon sign bulbs consist of plasma
(b) The gas gets ionised when electrical energy flows through it
(c) It consists of super-energetic and super-excited particles
(d) The plasma glows with colour which does not depend upon nature of gas
Answer:
| 1-d | 2-b | 3-b | 4-a | 5-c |
|---|---|---|---|---|
| 6-b | 7-a | 8-b | 9-a | 10-c |
| 11-c | 12-c | 13-d | 14-a | 15-c |
| 16-d | 17-a | 18-d | 19-b | 20-c |
| 21-c | 22-a | 23-c | 24-a | 25-a |
| 26-d | 27-c | 28-b | 29-c | 30-b |
| 31-d | 32-b | 33-a | 34-d | 35-d |
| 36-d | 37-c | 38-b | 39-a | 40-c |
| 41-a | 42-c | 43-b | 44-a | 45-b |
| 46-b | 47-b | 48-a | 49-a | 50-a |
| 51-a | 52-c | 53-d | 54-a | 55-d |