{"id":11992,"date":"2025-08-13T12:03:26","date_gmt":"2025-08-13T11:03:26","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=11992"},"modified":"2025-10-22T10:13:28","modified_gmt":"2025-10-22T09:13:28","slug":"matter-and-its-states-100-mcqs-with-answer","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/08\/13\/matter-and-its-states-100-mcqs-with-answer\/","title":{"rendered":"Matter and Its States 100 MCQs With Answer"},"content":{"rendered":"\n

1. Which of the following is NOT a state of matter?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Energy
Answer:<\/strong> d) Energy
Explanation:<\/strong> Energy is not matter; matter has mass and occupies space.<\/p>\n\n\n\n

2. Matter is made up of _______.<\/mark><\/strong>
a) Cells
b) Atoms
c) Molecules
d) Both b and c
Answer:<\/strong> d) Both b and c
Explanation:<\/strong> Matter is composed of atoms, which can form molecules.<\/p>\n\n\n\n

3. Which of the following has a definite shape and definite volume?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> a) Solid
Explanation:<\/strong> Solids have fixed shape and volume due to strong intermolecular forces.<\/p>\n\n\n\n

4. Which state of matter has neither definite shape nor definite volume?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> c) Gas
Explanation:<\/strong> Gases take the shape and volume of their container.<\/p>\n\n\n\n

5. Which of the following is NOT an example of matter?<\/mark><\/strong>
a) Air
b) Water
c) Sound
d) Ice
Answer:<\/strong> c) Sound
Explanation:<\/strong> Sound is a form of energy, not matter.<\/p>\n\n\n\n

6. Which physical property is common to all states of matter?<\/mark><\/strong>
a) Mass and volume
b) Shape
c) Rigidity
d) Color
Answer:<\/strong> a) Mass and volume
Explanation:<\/strong> All matter has mass and occupies space.<\/p>\n\n\n\n

7. Which is the smallest particle of matter that retains its chemical properties?<\/mark><\/strong>
a) Atom
b) Molecule
c) Electron
d) Nucleus
Answer:<\/strong> a) Atom
Explanation:<\/strong> Atoms are the basic units of chemical elements.<\/p>\n\n\n\n

8. What is the SI unit of mass?<\/mark><\/strong>
a) Gram
b) Kilogram
c) Pound
d) Newton
Answer:<\/strong> b) Kilogram
Explanation:<\/strong> Kilogram is the standard SI unit of mass.<\/p>\n\n\n\n

9. Which state of matter has high compressibility?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) All of these
Answer:<\/strong> c) Gas
Explanation:<\/strong> Gases can be compressed easily due to large intermolecular spaces.<\/p>\n\n\n\n

10. Which process converts a solid directly into gas?<\/mark><\/strong>
a) Condensation
b) Sublimation
c) Evaporation
d) Fusion
Answer:<\/strong> b) Sublimation
Explanation:<\/strong> Sublimation is the direct change from solid to gas without passing through the liquid state.<\/p>\n\n\n\n

\n\n\n\n

11. Which property is related to the arrangement of particles in solids?<\/mark><\/strong>
a) Fixed arrangement
b) Random arrangement
c) Loose arrangement
d) None of these
Answer:<\/strong> a) Fixed arrangement
Explanation:<\/strong> Solid particles are closely packed in a fixed arrangement.<\/p>\n\n\n\n

12. Which state of matter can flow?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Both b and c
Answer:<\/strong> d) Both b and c
Explanation:<\/strong> Liquids and gases can flow due to weaker intermolecular forces.<\/p>\n\n\n\n

13. Which state of matter has the highest kinetic energy?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> d) Plasma
Explanation:<\/strong> Plasma particles have extremely high energy due to ionization.<\/p>\n\n\n\n

14. The term \u2018fluid\u2019 is used for ________.<\/mark><\/strong>
a) Solids
b) Liquids and gases
c) Gases only
d) Plasmas only
Answer:<\/strong> b) Liquids and gases
Explanation:<\/strong> Liquids and gases can flow, so they are called fluids.<\/p>\n\n\n\n

15. The density of a substance is given by the formula:<\/mark><\/strong>
a) Mass \u00d7 Volume
b) Volume \u00f7 Mass
c) Mass \u00f7 Volume
d) Mass \u00d7 Acceleration
Answer:<\/strong> c) Mass \u00f7 Volume
Explanation:<\/strong> Density is mass per unit volume.<\/p>\n\n\n\n

16. Which state of matter is characterized by particles vibrating in place?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> a) Solid
Explanation:<\/strong> In solids, particles vibrate about fixed positions.<\/p>\n\n\n\n

17. Which of the following expands the most on heating?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> c) Gas
Explanation:<\/strong> Gases expand the most due to weak intermolecular forces.<\/p>\n\n\n\n

18. What is diffusion?<\/mark><\/strong>
a) Movement of solids
b) Mixing of particles due to motion
c) Liquid to gas conversion
d) Gas to liquid conversion
Answer:<\/strong> b) Mixing of particles due to motion
Explanation:<\/strong> Diffusion occurs due to random motion of particles.<\/p>\n\n\n\n

19. Which state of matter is used in fluorescent lamps?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> d) Plasma
Explanation:<\/strong> Fluorescent lamps contain ionized gas (plasma).<\/p>\n\n\n\n

20. Which state of matter is most incompressible?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> a) Solid
Explanation:<\/strong> Solid particles are tightly packed, so they cannot be compressed easily.<\/p>\n\n\n\n

21. The process of conversion of liquid into gas at any temperature is called:<\/mark><\/strong>
a) Boiling
b) Evaporation
c) Condensation
d) Freezing
Answer:<\/strong> b) Evaporation
Explanation:<\/strong> Evaporation occurs at all temperatures from the surface of a liquid.<\/p>\n\n\n\n

22. Boiling occurs when:<\/mark><\/strong>
a) Vapor pressure = Atmospheric pressure
b) Vapor pressure < Atmospheric pressure
c) Vapor pressure > Atmospheric pressure
d) Liquid is cooled
Answer:<\/strong> a) Vapor pressure = Atmospheric pressure
Explanation:<\/strong> At boiling point, vapor pressure equals atmospheric pressure.<\/p>\n\n\n\n

23. Conversion of gas into liquid is called:<\/mark><\/strong>
a) Evaporation
b) Condensation
c) Sublimation
d) Fusion
Answer:<\/strong> b) Condensation
Explanation:<\/strong> Condensation changes gas into liquid by cooling.<\/p>\n\n\n\n

24. Conversion of liquid into solid is called:<\/mark><\/strong>
a) Evaporation
b) Freezing
c) Melting
d) Sublimation
Answer:<\/strong> b) Freezing
Explanation:<\/strong> Freezing occurs when temperature is lowered below the freezing point.<\/p>\n\n\n\n

25. Ice melts at:<\/mark><\/strong>
a) 0\u00b0C
b) 100\u00b0C
c) 32\u00b0F
d) Both a and c
Answer:<\/strong> d) Both a and c
Explanation:<\/strong> Ice melts at 0\u00b0C (32\u00b0F) under normal atmospheric pressure.<\/p>\n\n\n\n

26. The heat required to convert solid to liquid at constant temperature is called:<\/mark><\/strong>
a) Latent heat of vaporization
b) Latent heat of fusion
c) Specific heat
d) Sensible heat
Answer:<\/strong> b) Latent heat of fusion
Explanation:<\/strong> It\u2019s the energy needed to change the phase from solid to liquid without temperature change.<\/p>\n\n\n\n

27. Which factor increases the rate of evaporation?<\/mark><\/strong>
a) Low temperature
b) Low surface area
c) High wind speed
d) High humidity
Answer:<\/strong> c) High wind speed
Explanation:<\/strong> Higher wind speed removes vapor molecules, increasing evaporation.<\/p>\n\n\n\n

28. During boiling, temperature of a liquid:<\/mark><\/strong>
a) Increases continuously
b) Decreases
c) Remains constant
d) First increases, then decreases
Answer:<\/strong> c) Remains constant
Explanation:<\/strong> All heat energy is used for phase change, not for raising temperature.<\/p>\n\n\n\n

29. Dry ice is solid:<\/mark><\/strong>
a) Water
b) Carbon dioxide
c) Nitrogen
d) Oxygen
Answer:<\/strong> b) Carbon dioxide
Explanation:<\/strong> Solid CO\u2082 sublimates directly into gas at normal pressure.<\/p>\n\n\n\n

30. Which process is reverse of sublimation?<\/mark><\/strong>
a) Evaporation
b) Deposition
c) Condensation
d) Fusion
Answer:<\/strong> b) Deposition
Explanation:<\/strong> Deposition changes gas directly into solid.<\/p>\n\n\n\n

31. Melting point of a solid depends on:<\/mark><\/strong>
a) Atmospheric pressure
b) Intermolecular forces
c) Temperature only
d) Both a and b
Answer:<\/strong> d) Both a and b
Explanation:<\/strong> Stronger intermolecular forces and changes in pressure affect melting point.<\/p>\n\n\n\n

32. Freezing point of a liquid decreases by:<\/mark><\/strong>
a) Adding impurities
b) Increasing temperature
c) Increasing pressure
d) None of these
Answer:<\/strong> a) Adding impurities
Explanation:<\/strong> Impurities lower the freezing point (freezing point depression).<\/p>\n\n\n\n

33. The temperature at which a substance changes from liquid to gas is called:<\/mark><\/strong>
a) Freezing point
b) Boiling point
c) Melting point
d) Sublimation point
Answer:<\/strong> b) Boiling point
Explanation:<\/strong> Boiling point is when vapor pressure equals external pressure.<\/p>\n\n\n\n

34. Latent heat of vaporization of water is:<\/mark><\/strong>
a) 540 cal\/g
b) 80 cal\/g
c) 4200 J\/kg
d) 100 cal\/g
Answer:<\/strong> a) 540 cal\/g
Explanation:<\/strong> It\u2019s the energy required to convert water into vapor at constant temperature.<\/p>\n\n\n\n

35. Evaporation causes cooling because:<\/mark><\/strong>
a) Molecules gain energy
b) Molecules lose high-energy particles
c) Pressure increases
d) Temperature increases
Answer:<\/strong> b) Molecules lose high-energy particles
Explanation:<\/strong> High-energy molecules escape, lowering average kinetic energy.<\/p>\n\n\n\n

36. The temperature at which solid, liquid, and gas coexist is called:<\/mark><\/strong>
a) Boiling point
b) Triple point
c) Critical point
d) Sublimation point
Answer:<\/strong> b) Triple point
Explanation:<\/strong> Triple point is a unique temperature and pressure for coexistence of all three states.<\/p>\n\n\n\n

37. Water boils at lower temperature on mountains because:<\/mark><\/strong>
a) Pressure is higher
b) Pressure is lower
c) Gravity is less
d) Temperature is lower
Answer:<\/strong> b) Pressure is lower
Explanation:<\/strong> Lower atmospheric pressure reduces boiling point.<\/p>\n\n\n\n

38. Conversion of vapor into ice directly is called:<\/mark><\/strong>
a) Condensation
b) Freezing
c) Deposition
d) Sublimation
Answer:<\/strong> c) Deposition
Explanation:<\/strong> Deposition changes gas directly into solid.<\/p>\n\n\n\n

39. Which process is used in making ice-cream without a freezer?<\/mark><\/strong>
a) Using cold water
b) Adding salt to ice
c) Adding sugar to ice
d) Using hot water
Answer:<\/strong> b) Adding salt to ice
Explanation:<\/strong> Salt lowers freezing point, allowing ice to absorb more heat.<\/p>\n\n\n\n

40. Which change of state absorbs heat?<\/mark><\/strong>
a) Freezing
b) Condensation
c) Melting
d) Deposition
Answer:<\/strong> c) Melting
Explanation:<\/strong> Melting absorbs heat to break bonds between particles.<\/p>\n\n\n\n

\n\n\n\n

41. Boyle\u2019s law states that at constant temperature:<\/mark><\/strong>
a) P \u221d V
b) P \u221d 1\/V
c) V \u221d T
d) P \u221d T
Answer:<\/strong> b) P \u221d 1\/V
Explanation:<\/strong> Boyle\u2019s law: Pressure is inversely proportional to volume at constant temperature.<\/p>\n\n\n\n

42. Charles\u2019s law states that at constant pressure:<\/mark><\/strong>
a) V \u221d T
b) V \u221d 1\/T
c) P \u221d T
d) P \u221d 1\/T
Answer:<\/strong> a) V \u221d T
Explanation:<\/strong> Volume of a gas increases with temperature at constant pressure.<\/p>\n\n\n\n

43. Kelvin temperature scale starts from:<\/mark><\/strong>
a) -273\u00b0C
b) 0\u00b0C
c) -273 K
d) 273\u00b0C
Answer:<\/strong> a) -273\u00b0C
Explanation:<\/strong> Absolute zero (-273\u00b0C) is 0 K.<\/p>\n\n\n\n

44. Ideal gas equation is:<\/mark><\/strong>
a) PV = nRT
b) PV = RT
c) P\/T = V
d) PV\/T = R
Answer:<\/strong> a) PV = nRT
Explanation:<\/strong> Ideal gas equation combines Boyle\u2019s, Charles\u2019s, and Avogadro\u2019s laws.<\/p>\n\n\n\n

45. Avogadro\u2019s law states that equal volumes of gases contain:<\/mark><\/strong>
a) Equal masses
b) Equal number of molecules
c) Equal density
d) Equal pressure
Answer:<\/strong> b) Equal number of molecules
Explanation:<\/strong> At same temperature and pressure, equal volumes contain equal molecules.<\/p>\n\n\n\n

46. Gas pressure is due to:<\/mark><\/strong>
a) Weight of gas
b) Collisions of molecules with container walls
c) Volume of container
d) Shape of container
Answer:<\/strong> b) Collisions of molecules with container walls
Explanation:<\/strong> Molecular collisions cause gas pressure.<\/p>\n\n\n\n

47. If temperature is constant and volume is halved, pressure will:<\/mark><\/strong>
a) Halve
b) Double
c) Remain same
d) Become zero
Answer:<\/strong> b) Double
Explanation:<\/strong> Boyle\u2019s law: P\u2081V\u2081 = P\u2082V\u2082.<\/p>\n\n\n\n

48. Charles\u2019s law shows relation between:<\/mark><\/strong>
a) Pressure and volume
b) Volume and temperature
c) Pressure and temperature
d) Volume and mass
Answer:<\/strong> b) Volume and temperature
Explanation:<\/strong> V\/T = constant at constant pressure.<\/p>\n\n\n\n

49. Pressure is measured in:<\/mark><\/strong>
a) Pascal
b) Kelvin
c) Joule
d) Newton
Answer:<\/strong> a) Pascal
Explanation:<\/strong> Pascal (Pa) is the SI unit of pressure.<\/p>\n\n\n\n

50. Temperature in gas laws must be measured in:<\/mark><\/strong>
a) Celsius
b) Fahrenheit
c) Kelvin
d) Rankine
Answer:<\/strong> c) Kelvin
Explanation:<\/strong> Kelvin ensures proportionality in gas laws.<\/p>\n\n\n\n

51. Gay-Lussac\u2019s law relates:<\/mark><\/strong>
a) Volume and temperature
b) Pressure and temperature
c) Pressure and volume
d) Temperature and density
Answer:<\/strong> b) Pressure and temperature
Explanation:<\/strong> P\/T = constant at constant volume.<\/p>\n\n\n\n

52. In the ideal gas equation PV = nRT, R is:<\/mark><\/strong>
a) Gas constant
b) Resistance
c) Radius
d) Reactivity
Answer:<\/strong> a) Gas constant
Explanation:<\/strong> R = 8.314 J\/mol\u00b7K.<\/p>\n\n\n\n

53. At constant temperature, doubling volume will:<\/mark><\/strong>
a) Double pressure
b) Halve pressure
c) Keep pressure constant
d) Increase temperature
Answer:<\/strong> b) Halve pressure
Explanation:<\/strong> Boyle\u2019s law.<\/p>\n\n\n\n

54. A gas expands when heated because:<\/mark><\/strong>
a) Molecules become lighter
b) Kinetic energy increases
c) Pressure decreases
d) Molecules disappear
Answer:<\/strong> b) Kinetic energy increases
Explanation:<\/strong> Heating increases molecular motion, increasing volume.<\/p>\n\n\n\n

55. Standard temperature and pressure (STP) is:<\/strong>
<\/mark>a) 0\u00b0C, 1 atm
b) 25\u00b0C, 1 atm
c) 0\u00b0C, 760 mmHg
d) Both a and c
Answer:<\/strong> d) Both a and c
Explanation:<\/strong> STP is 0\u00b0C and 1 atm (760 mmHg).<\/p>\n\n\n\n

56. Which law is used in scuba diving gas calculations?<\/mark><\/strong>
a) Boyle\u2019s law
b) Charles\u2019s law
c) Gay-Lussac\u2019s law
d) Avogadro\u2019s law
Answer:<\/strong> a) Boyle\u2019s law
Explanation:<\/strong> Pressure-volume changes under water follow Boyle\u2019s law.<\/p>\n\n\n\n

57. The total pressure of a gas mixture equals sum of partial pressures is:<\/mark><\/strong>
a) Dalton\u2019s law
b) Avogadro\u2019s law
c) Boyle\u2019s law
d) Charles\u2019s law
Answer:<\/strong> a) Dalton\u2019s law
Explanation:<\/strong> Dalton\u2019s law of partial pressures.<\/p>\n\n\n\n

58. If gas temperature increases, volume increases at constant pressure due to:<\/mark><\/strong>
a) Boyle\u2019s law
b) Charles\u2019s law
c) Avogadro\u2019s law
d) Graham\u2019s law
Answer:<\/strong> b) Charles\u2019s law
Explanation:<\/strong> Volume is directly proportional to temperature.<\/p>\n\n\n\n

59. Which gas law explains why balloons burst in sunlight?<\/mark><\/strong>
a) Boyle\u2019s law
b) Charles\u2019s law
c) Avogadro\u2019s law
d) Dalton\u2019s law
Answer:<\/strong> b) Charles\u2019s law
Explanation:<\/strong> Heat increases gas volume, causing burst.<\/p>\n\n\n\n

60. Graham\u2019s law relates to:<\/mark><\/strong>
a) Diffusion of gases
b) Pressure
c) Volume
d) Temperature
Answer:<\/strong> a) Diffusion of gases
Explanation:<\/strong> Rate of diffusion \u221d 1\/\u221amolar mass.<\/p>\n\n\n\n

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61. Plasma is formed when:<\/mark><\/strong>
a) Solid melts
b) Gas ionizes
c) Liquid freezes
d) Gas condenses
Answer:<\/strong> b) Gas ionizes
Explanation:<\/strong> Plasma is ionized gas.<\/p>\n\n\n\n

62. Which state of matter is found in stars?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> d) Plasma
Explanation:<\/strong> Stars are mostly plasma.<\/p>\n\n\n\n

63. Bose-Einstein condensate occurs at:<\/mark><\/strong>
a) Very high temperature
b) Near absolute zero
c) Normal room temperature
d) In vacuum
Answer:<\/strong> b) Near absolute zero
Explanation:<\/strong> BEC forms at extremely low temperatures.<\/p>\n\n\n\n

64. Which property distinguishes plasma from gas?<\/mark><\/strong>
a) Fixed shape
b) Ionization
c) Strong bonds
d) Low density
Answer:<\/strong> b) Ionization
Explanation:<\/strong> Plasma has free ions and electrons.<\/p>\n\n\n\n

65. Which state of matter conducts electricity best?<\/mark><\/strong>
a) Solid metals
b) Liquids
c) Gases
d) Plasma
Answer:<\/strong> d) Plasma
Explanation:<\/strong> Free charged particles conduct electricity well.<\/p>\n\n\n\n

66. Which is the fourth state of matter?<\/mark><\/strong>
a) Liquid
b) Plasma
c) BEC
d) Gas
Answer:<\/strong> b) Plasma
Explanation:<\/strong> Plasma is called the fourth state.<\/p>\n\n\n\n

67. Which state is sometimes called \u201csuperfluid\u201d?<\/mark><\/strong>
a) Plasma
b) Bose-Einstein condensate
c) Liquid helium
d) Both b and c
Answer:<\/strong> d) Both b and c
Explanation:<\/strong> BEC and liquid helium show superfluidity.<\/p>\n\n\n\n

68. Which state is used in neon signs?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> d) Plasma
Explanation:<\/strong> Neon gas glows when ionized.<\/p>\n\n\n\n

69. Superconductivity occurs in some materials when:<\/mark><\/strong>
a) Heated
b) Cooled to low temperature
c) Compressed
d) Ionized
Answer:<\/strong> b) Cooled to low temperature
Explanation:<\/strong> Resistance drops to zero at low temperature.<\/p>\n\n\n\n

70. Matter can change state by altering:<\/mark><\/strong>
a) Temperature
b) Pressure
c) Both a and b
d) Neither a nor b
Answer:<\/strong> c) Both a and b
Explanation:<\/strong> Changes in temperature or pressure cause state change.<\/p>\n\n\n\n

71. Which state has particles in fixed positions but can vibrate?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> a) Solid
Explanation:<\/strong> Solid particles vibrate about fixed points.<\/p>\n\n\n\n

72. Which state has no fixed volume?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Both b and c
Answer:<\/strong> c) Gas
Explanation:<\/strong> Gases have no fixed shape or volume.<\/p>\n\n\n\n

73. Which property increases from solid \u2192 liquid \u2192 gas?<\/mark><\/strong>
a) Density
b) Kinetic energy
c) Intermolecular force
d) Rigidity
Answer:<\/strong> b) Kinetic energy
Explanation:<\/strong> Particle motion increases.<\/p>\n\n\n\n

74. Which state of matter has the strongest intermolecular forces?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> a) Solid
Explanation:<\/strong> Particles are tightly bound.<\/p>\n\n\n\n

75. Which change of state releases heat?<\/mark><\/strong>
a) Melting
b) Vaporization
c) Condensation
d) Sublimation
Answer:<\/strong> c) Condensation
Explanation:<\/strong> Gas to liquid releases latent heat.<\/p>\n\n\n\n

76. Which change of state is endothermic?<\/mark><\/strong>
a) Freezing
b) Condensation
c) Melting
d) Deposition
Answer:<\/strong> c) Melting
Explanation:<\/strong> Heat is absorbed to break bonds.<\/p>\n\n\n\n

77. Which gas law explains LPG cylinder pressure?<\/mark><\/strong>
a) Boyle\u2019s law
b) Charles\u2019s law
c) Gay-Lussac\u2019s law
d) Dalton\u2019s law
Answer:<\/strong> a) Boyle\u2019s law
Explanation:<\/strong> Pressure varies inversely with volume.<\/p>\n\n\n\n

78. At absolute zero, the motion of particles:<\/mark><\/strong>
a) Stops completely
b) Increases
c) Becomes random
d) Doubles
Answer:<\/strong> a) Stops completely
Explanation:<\/strong> No kinetic energy at 0 K.<\/p>\n\n\n\n

79. Critical temperature is:<\/mark><\/strong>
a) Temp. above which gas cannot liquefy
b) Temp. below freezing point
c) Temp. of triple point
d) Temp. at 0 K
Answer:<\/strong> a) Temp. above which gas cannot liquefy
Explanation:<\/strong> Beyond critical temp, gas remains gas.<\/p>\n\n\n\n

80. In diffusion, lighter gases diffuse:<\/mark><\/strong>
a) Slower
b) Faster
c) Same rate as heavy gases
d) Not at all
Answer:<\/strong> b) Faster
Explanation:<\/strong> Graham\u2019s law: rate \u221d 1\/\u221amolar mass.<\/p>\n\n\n\n

81. Which is a man-made state of matter?<\/mark><\/strong>
a) Solid
b) Plasma
c) BEC
d) Both b and c
Answer:<\/strong> d) Both b and c
Explanation:<\/strong> Plasma and BEC are created under special conditions.<\/p>\n\n\n\n

82. Which state shows Brownian motion?<\/mark><\/strong>
a) Solid only
b) Liquid only
c) Gas only
d) Both liquids and gases
Answer:<\/strong> d) Both liquids and gases
Explanation:<\/strong> Brownian motion occurs in fluids.<\/p>\n\n\n\n

83. Which change of state is used in refrigerators?<\/mark><\/strong>
a) Evaporation and condensation
b) Sublimation
c) Melting
d) Deposition
Answer:<\/strong> a) Evaporation and condensation
Explanation:<\/strong> Refrigeration cycles use phase changes to absorb and release heat.<\/p>\n\n\n\n

84. Which type of solid has no definite melting point?<\/mark><\/strong>
a) Crystalline
b) Amorphous
c) Ionic
d) Metallic
Answer:<\/strong> b) Amorphous
Explanation:<\/strong> Amorphous solids soften over a range of temperatures.<\/p>\n\n\n\n

85. Glass is an example of:<\/mark><\/strong>
a) Crystalline solid
b) Amorphous solid
c) Liquid
d) Gas
Answer:<\/strong> b) Amorphous solid
Explanation:<\/strong> Glass has disordered atomic arrangement.<\/p>\n\n\n\n

86. Which state exists inside the sun?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> d) Plasma
Explanation:<\/strong> The sun is made of ionized gases.<\/p>\n\n\n\n

87. Which is more compressible \u2014 liquid or solid?<\/mark><\/strong>
a) Liquid
b) Solid
c) Same
d) None
Answer:<\/strong> a) Liquid
Explanation:<\/strong> Liquids have more space between particles than solids.<\/p>\n\n\n\n

88. Which gas law is used in hot air balloons?<\/mark><\/strong>
a) Boyle\u2019s
b) Charles\u2019s
c) Avogadro\u2019s
d) Dalton\u2019s
Answer:<\/strong> b) Charles\u2019s
Explanation:<\/strong> Heating increases volume, making balloon rise.<\/p>\n\n\n\n

89. Which state of matter has highest disorder?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:<\/strong> c) Gas
Explanation:<\/strong> Gas particles move randomly in all directions.<\/p>\n\n\n\n

90. Which of the following is an example of amorphous solid?<\/mark><\/strong>
a) Diamond
b) Quartz
c) Glass
d) Sodium chloride
Answer:<\/strong> c) Glass
Explanation:<\/strong> Glass lacks a regular crystal structure, so it is amorphous.<\/p>\n\n\n\n

91. Which state of matter is known as the fourth state of matter?<\/mark><\/strong>
a) Gas
b) Plasma
c) Bose\u2013Einstein condensate
d) Liquid
Answer:<\/strong> b) Plasma
Explanation:<\/strong> Plasma is called the fourth state of matter, consisting of ionized particles.<\/p>\n\n\n\n

92. Which of the following processes is exothermic?<\/mark><\/strong>
a) Melting of ice
b) Evaporation of water
c) Condensation of steam
d) Sublimation of camphor
Answer:<\/strong> c) Condensation of steam
Explanation:<\/strong> Condensation releases heat to the surroundings.<\/p>\n\n\n\n

93. Which of the following is NOT a crystalline solid?<\/mark><\/strong>
a) Sodium chloride
b) Quartz
c) Sugar
d) Rubber
Answer:<\/strong> d) Rubber
Explanation:<\/strong> Rubber is amorphous, not crystalline.<\/p>\n\n\n\n

94. Which factor does NOT affect the rate of evaporation?<\/mark><\/strong>
a) Surface area
b) Temperature
c) Humidity
d) Density of liquid
Answer:<\/strong> d) Density of liquid
Explanation:<\/strong> Evaporation rate is influenced mainly by temperature, surface area, and humidity.<\/p>\n\n\n\n

95. Which of the following best describes sublimation?<\/mark><\/strong>
a) Liquid \u2192 Gas
b) Solid \u2192 Gas
c) Gas \u2192 Liquid
d) Solid \u2192 Liquid
Answer:<\/strong> b) Solid \u2192 Gas
Explanation:<\/strong> Sublimation is the direct change from solid to gas without becoming liquid.<\/p>\n\n\n\n

96. Which state of matter exists at very low temperatures and behaves as a single quantum entity?<\/mark><\/strong>
a) Plasma
b) Bose\u2013Einstein condensate
c) Liquid
d) Superfluid
Answer:<\/strong> b) Bose\u2013Einstein condensate
Explanation:<\/strong> Bose\u2013Einstein condensates occur near absolute zero with atoms behaving in unison.<\/p>\n\n\n\n

97. Which is the slowest process among the following?<\/mark><\/strong>
a) Diffusion in gases
b) Diffusion in liquids
c) Diffusion in solids
d) All are same
Answer:<\/strong> c) Diffusion in solids
Explanation:<\/strong> Particle motion is slowest in solids, so diffusion is very slow.<\/p>\n\n\n\n

98. Which type of change is melting of ice?<\/mark><\/strong>
a) Physical change
b) Chemical change
c) Both a and b
d) Neither a nor b
Answer:<\/strong> a) Physical change
Explanation:<\/strong> Melting of ice changes state but not chemical composition.<\/p>\n\n\n\n

99. What happens to the kinetic energy of particles when a solid changes into liquid?<\/mark><\/strong>
a) Decreases
b) Increases
c) Remains same
d) First decreases then increases
Answer:<\/strong> b) Increases
Explanation:<\/strong> Particle movement increases during melting, so kinetic energy increases.<\/p>\n\n\n\n

100. Which gas law explains why a balloon expands when heated?<\/mark><\/strong>
a) Boyle\u2019s law
b) Charles\u2019s law
c) Avogadro\u2019s law
d) Dalton\u2019s law
Answer:<\/strong> b) Charles\u2019s law
Explanation:<\/strong> Charles\u2019s law states that at constant pressure, volume of a gas is directly proportional to temperature.<\/p>\n","protected":false},"excerpt":{"rendered":"

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