Chemistry For Class IX (New Book ) - Chapter No. 5 - Physical States of Matter - Multiple Choice Questions And Fill In The Blanks

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Chapter No.5 - Physical States of Matter
MCQs And Fill In The Blanks
Text Book Exercise

SECTION- A: MULTIPLE CHOICE QUESTIONS
Tick Mark (✓) the correct answer

1. Which of the following gas diffuses fastest?
(a) Hydrogen ✓
(b) Chlorine
(c) Fluorine
(d) Helium

2. The vapour pressure of a liquid increases with the:
(a) increase of pressure
(b) increase of temperature ✓
(c) increase of intermolecular forces
(d) increase the polarity of molecules

3. The freezing point depends upon:
(a) Nature of liquid
(b) Pressure
(c) Temperature ✓
(d) Volume

4. One atmospheric pressure is equal to:
(a) 10325 Pascal
(b) 106075 Pascal
(c) 10523 Pascal
(d) 101325 Pascal ✓

5. Which of the following does not affect the boiling point:
(a) Intermolecular forces
(b) External pressure
(c) Initial temperature of liquid ✓
(d) Nature of liquid

6. The mobility of liquids is lesser than:
(a) Solids
(b) Gases ✓
(c) Plasma
(d) Bose Einstein Condensate

7. Which of the following have sharp melting point in solids:
(a) Plastic
(b) Rubber
(c) Glass
(d) Diamond ✓

8. Which of the following are lightest form of matter:
(a) Solid
(b) Liquid
(c) Gases
(d) Plasma ✓

9. The liquid molecules leave the surface of liquid in evaporation process because:
(a) Energy is low
(b) Energy is moderate
(c) Energy is high ✓
(d) None of these

10.The density of gases increases when its:
(a) Pressure increased ✓
(b) Temperature increased
(c) Volume increased
(d) None of these

11. Anything which has mass and occupies space is the definition of:
(a) matter ✓
(b) atom
(c) space
(d) mass

12. A gas has no fixed:
(a) mass
(b) weight
(c) volume ✓
(d) density

13. It can easily be compressed and expanded.
(a) Liquid
(b) Gas ✓
(c) Solid
(d) Plasma

14. Liquid has no fixed:
(a) mass
(b) weight
(c) volume
(d) shape ✓

15. The different physical states of matter are due to:
(a) arrangement of molecules
(b) intermolecular forces
(c) Both 'a' & 'b' ✓
(d) None of them

16. The gaseous state molecules are lying away from one another, this assumption was proposed by:
(a) Boltzmann
(b) Maxwell
(c) Kelvin
(d) All of them ✓

17. Spontaneous mixing of molecules by random motion and collision to form a homogeneous mixture is called:
(a) Diffusion ✓
(b) Effusion
(c) Mobility
(d) Compressibility

18. Gases are rapidly diffusible and depend upon the:
(a) the atomic mass of the gases
(b) molecular mass of the gases ✓
(c) the density of the gases
(d) temperature of the gases

19. It is the movement of particles from an area of high concentration to one of low concentration.
(a) Diffusion ✓
(b) Effusion
(c) Mobility
(d) Compressibility

20. The rate of diffusion does not depend upon:
(a) temperature
(b) viscosity of the medium
(c) volume ✓
(d) the size & mass of the particles

21. This is NOT an example of diffusion.
(a) You can smell perfume
(b) Garbage stinks
(c) Smoke in the air
(d) Leakage of air through a tyre pinhole ✓

22. It is escaping of gas molecules through a tiny hole into space with lesser pressure.
(a) Diffusion
(b) Effusion ✓
(c) Mobility
(d) Compressibility

23. Effusion depends upon:
(a) molecular masses of gases ✓
(b) viscosity of the medium
(c) the size & mass of the particles
(d) temperature

24. Which of the following gas effuses rapidly?
(a) Hydrogen ✓
(b) Chlorine
(c) Fluorine
(d) Helium

25. It is an example of effusion.
(a) You can smell perfume
(b) Garbage stinks
(c) Leakage of helium through gas balloons ✓
(d) Smoke in the air

26. The force exerted by gaseous particles per unit area is called:
(a) viscosity
(b) density
(c) rigidity
(d) gas pressure ✓

27. Pressure = _____:
(a) Force x Area
(b) Force / Area ✓
(c) Area / Force
(d) Force x Area / 2

28. S.I. unit of pressure is:
(a) Nm²
(b) Nm^-2 ✓
(c) N^2m
(d) N^-2m

29. It is used to measure the atmospheric pressure.
(a) Barometer ✓
(b) Manometer
(c) Lactometer
(d) Ammeter

30. The capacity of something to be flattened or reduced in size by pressure is called:
(a) density
(b) mobility
(c) effusion
(d) compressibility ✓

31. The gases are highly compressible due to:
(a) the size & mass of the particles
(b) molecular masses of gases
(c) larger spaces between their molecules ✓
(d) density of gases

32. It is degree of compactness or closeness of a molecules.
(a) Mobility
(b) Density ✓
(c) Effusion
(d) Diffusion

33. Gases have:
(a) low density ✓
(b) moderate density
(c) high density
(d) zero density

34. Gas density is expressed in:
(a) Nm^-2
(b) kelvin
(c) pascal
(d) grams per dm³ ✓

35. At constant temperature, the volume of a given mass of a gas is inversely proportional to its:
(a) density
(b) weight
(c) pressure ✓
(d) viscosity

36. At constant temperature, according to Boyle's law the volume of a given mass of a gas:
(a) decreases with the increase of pressure ✓
(b) decreases with the decrease of pressure
(c) decreases with the increase of density
(d) decreases with the decrease of density

37. Mathematical representation of Boyle's Law is:
(a) P/V = K
(b) PV = K ✓
(c) V/T = K
(d) VT = K

38.The average distance that a gas particle travels between successive collisions with other gas particles is called:
(a) average path
(b) independent path
(c) free path
(d) mean free path ✓

39. 1 atm = ___:
(a) 760 mm of Hg ✓
(b) 780 torr
(c) 103325 pascal
(d) All of these

40. If the pressure is kept constant, the volume of a given mass of a gas is:
(a) directly proportional to atmospheric pressure
(b) inversely proportional to atmospheric pressure
(c) directly proportional to the absolute temperature ✓
(d) inversely proportional to the absolute temperature

41. Mathematical representation of Charles's Law is:
(a) P/V = K
(b) PV = K
(c) V/T = K ✓
(d) VT = K

42. Zero of absolute temperature scale or Kelvin scale is equal to:
(a) 273°C
(b) -273°C ✓
(c) 273°F
(d) -273°F

43. At absolute zero (-273°C), an ideal gas would have:
(a) zero volume ✓
(b) minimum volume
(c) maximum volume
(d) None of these

44. 273 kelvin is equal to:
(a)-273 Celsius
(b) 273 Celsius
(c) 100 Celsius
(d) zero Celsius ✓

45. Which one is correct?
(a) (T)°C (T) K+ 273
(b) (T)°C = (T) K - 273 ✓
(c) (T)°C = 273-(T) K
(d) None of them

46. The boiling point of liquids depends on the:
(a) temperature in Celsius
(b) temperature in kelvin
(c) external atmospheric pressure ✓
(d) volume of the liquid

47. Evaporation is directly proportional to the:
(a) volume of the liquid
(b) temperature ✓
(c) pressure
(d) density

48. The evaporation is considered as:
(a) cooling process ✓
(b) heating process
(c) reversible process
(d) convertible process

49. Neither definite shape nor volume is the property of:
(a) solid
(b) gas ✓
(c) liquid
(d) None of them

50. The process in which molecules escape from the surface of a liquid is called:
(a) effusion
(b) evaporation ✓
(c) boiling
(d) melting

51. A gas possesses neither definite shape nor definite:
(a) volume ✓
(b) power
(c) energy
(d) density

52. The intermediate state between solid and gas is:
(a) plasma
(b) liquid ✓
(c) Bose Einstein condensate
(d) All of them

53. If the surface area is greater than rate of evaporation is:
(a) zero
(b) moderate
(c) lower
(d) higher ✓

54. The rate of evaporation increases with:
(a) less intermolecular forces ✓
(b) strong intermolecular forces
(c) Both 'a' & 'b'
(d) None of these

55. Vapour pressure depends on:
(a) nature of liquid
(b) size of molecules
(c) temperature
(d) All of them ✓

56. The temperature at which vapour pressure of a liquid become equal to atmospheric pressure is called:
(a) evaporation of the liquid
(b) boiling point of the liquid ✓
(c) melting point of the liquid
(d) freezing point of the liquid

57. The boiling point is directly proportional to:
(a) temperature
(b) density
(c) atmospheric pressure ✓
(d) volume

58. The temperature at which the vapour pressure of a liquid state becomes equal to the vapour pressure of its solid state is known as:
(a) evaporation of the liquid
(b) boiling point of the liquid
(c) melting point of the liquid
(d) freezing point of the liquid ✓

59. At this temperature liquid and solid coexist in dynamic equilibrium.
(a) evaporation of the liquid
(b) boiling point of the liquid
(c) melting point of the liquid
(d) freezing point of the liquid ✓

60. The energy that molecules have is:
(a) potential energy
(b) kinetic energy ✓
(c) atomic energy
(d) molecular energy

61. The liquids diffuse less rapidly than:
(a) solids
(b) gases
(c) plasma ✓
(d) Bose Einstein condensate

62. Density can be expressed as D = ___:
(a) mass / volume ✓
(b) volume / mass
(c) mass / 2(volume)
(d) mass x volume

63. If we increase temperature, the density of a liquid will:
(a) become zero
(b) decrease ✓
(c) increase
(d) None of these

64. The solids in which molecules are arranged in definite three dimensional geometrical pattern are called:
(a) powder
(b) dense solids
(c) amorphous solids
(d) crystalline solids ✓

65. The solids in which molecules are not arranged in geometrical pattern are called:
(a) powder
(b) dense solids
(c) amorphous solids ✓
(d) crystalline solids

66. Which one of these is NOT an amorphous solid?
(a) Sodium Chloride ✓
(b) Glass
(c) Rubber
(d) Plastic

67. Which one of these is a crystalline solid?
(a) Glass
(b) Diamond ✓
(c) Rubber
(d) Plastic

68. The existence of an element in more than one crystalline forms is known as:
(a) cosmogenic
(b) radioactivity
(c) allotropy ✓
(d) isotope

69. Diamond and graphite are the allotropic form of:
(a) sodium
(b) gold
(c) Sulphur
(d) carbon ✓

70. In this form, the carbon atoms are bonded together in spheres, cylinders or egg-shaped formations.
(a) Diamond
(b) Graphite
(c) Graphane
(d) Fullerenes ✓

71. English scientist William Crookes identify the fourth states of matter known as:
(a) gas
(b) liquid
(c) plasma ✓
(d) Bose Einstein condensate

72. It is plasma naturally.
(a) Lightning ✓
(b) Lava formation
(c) Center of the earth
(d) All of these

73. It is super-hot and super excited atoms:
(a) Plasma ✓
(b) Bose Einstein condensate
(c) Both 'a' & 'b'
(d) None of these

74. Atoms are super unexcited and super cold in:
(a) Plasma
(b) Bose Einstein condensate ✓
(c) Both 'a' & 'b'
(d) None of these