1. The kinetic theory of matter explains
A) Behavior of matter in terms of motion of particles
B) Color of matter
C) Shape of solids
D) Sound in air
Answer: A) Behavior of matter in terms of motion of particles
Explanation: It states that matter consists of tiny particles in constant motion.
2. According to kinetic theory, all matter is made up of
A) Tiny particles
B) Energy only
C) Light rays
D) Sound waves
Answer: A) Tiny particles
Explanation: Matter is composed of atoms or molecules that move continuously.
3. The kinetic theory mainly explains
A) States of matter and their properties
B) Chemical reactions
C) Magnetism
D) Reflection of light
Answer: A) States of matter and their properties
4. In kinetic theory, temperature measures
A) Average kinetic energy of particles
B) Total potential energy
C) Pressure
D) Volume
Answer: A) Average kinetic energy of particles
5. The kinetic energy of particles increases when
A) Temperature increases
B) Temperature decreases
C) Pressure increases
D) Density decreases
Answer: A) Temperature increases
6. The kinetic theory applies best to
A) Gases
B) Solids
C) Liquids
D) Plasma
Answer: A) Gases
Explanation: Because gas particles are free to move and collisions are more noticeable.
7. In gases, intermolecular forces are
A) Very weak
B) Very strong
C) Moderate
D) Variable
Answer: A) Very weak
8. In solids, the particles
A) Vibrate about fixed positions
B) Move freely
C) Are far apart
D) Randomly scatter
Answer: A) Vibrate about fixed positions
9. The pressure of a gas is due to
A) Collisions of molecules with the container walls
B) Gravitational pull
C) Magnetic field
D) Chemical reaction
Answer: A) Collisions of molecules with the container walls
10. The force between molecules of matter is called
A) Intermolecular force
B) Frictional force
C) Magnetic force
D) Elastic force
Answer: A) Intermolecular force
11. The space between molecules is called
A) Intermolecular space
B) Atomic gap
C) Void
D) Air space
Answer: A) Intermolecular space
12. The kinetic theory assumes that gas molecules move in
A) Random motion
B) Fixed paths
C) Circular orbits
D) Oscillations
Answer: A) Random motion
13. The molecular motion stops completely at
A) Absolute zero temperature
B) Boiling point
C) Room temperature
D) Melting point
Answer: A) Absolute zero temperature
14. The average kinetic energy of gas molecules is proportional to
A) Temperature
B) Pressure
C) Volume
D) Density
Answer: A) Temperature
15. Brownian motion gives evidence that
A) Molecules are in constant motion
B) Atoms are stationary
C) Air is weightless
D) Matter is continuous
Answer: A) Molecules are in constant motion
16. Brownian motion was discovered by
A) Robert Brown
B) Rutherford
C) Newton
D) Faraday
Answer: A) Robert Brown
17. The kinetic energy of molecules is greatest in
A) Gases
B) Liquids
C) Solids
D) Ice
Answer: A) Gases
18. The interparticle spacing is smallest in
A) Solids
B) Liquids
C) Gases
D) Plasma
Answer: A) Solids
19. The process of mixing of two gases is called
A) Diffusion
B) Evaporation
C) Osmosis
D) Condensation
Answer: A) Diffusion
20. The rate of diffusion increases with
A) Temperature
B) Decrease in temperature
C) Decrease in pressure
D) Gravity
Answer: A) Temperature
21. The process of diffusion supports
A) Kinetic theory of matter
B) Electrostatics
C) Magnetism
D) Thermodynamics
Answer: A) Kinetic theory of matter
22. The interconversion of states of matter is due to
A) Change in kinetic energy
B) Change in density
C) Change in color
D) Shape change
Answer: A) Change in kinetic energy
23. When heat is supplied to a solid, its particles
A) Vibrate faster and move apart
B) Stop moving
C) Become heavier
D) Lose energy
Answer: A) Vibrate faster and move apart
24. When a gas is cooled, the molecules
A) Lose energy and move slowly
B) Move faster
C) Remain same
D) Expand
Answer: A) Lose energy and move slowly
25. The conversion of solid to gas directly is called
A) Sublimation
B) Condensation
C) Fusion
D) Freezing
Answer: A) Sublimation
26. The conversion of liquid into vapor is
A) Evaporation
B) Freezing
C) Condensation
D) Sublimation
Answer: A) Evaporation
27. Evaporation causes
A) Cooling effect
B) Heating
C) Melting
D) Pressure increase
Answer: A) Cooling effect
28. The temperature at which a solid melts is
A) Melting point
B) Boiling point
C) Evaporation point
D) Condensation point
Answer: A) Melting point
29. The temperature at which liquid starts boiling is
A) Boiling point
B) Melting point
C) Freezing point
D) Saturation point
Answer: A) Boiling point
30. The process of gas changing into liquid is
A) Condensation
B) Fusion
C) Sublimation
D) Freezing
Answer: A) Condensation
31. The process of liquid changing into solid is
A) Freezing
B) Melting
C) Boiling
D) Diffusion
Answer: A) Freezing
32. The increase in temperature increases
A) Molecular motion
B) Cohesive force
C) Density
D) Solidification
Answer: A) Molecular motion
33. Gases can be compressed easily because
A) Molecules are far apart
B) Molecules are close
C) They are heavy
D) They have strong attraction
Answer: A) Molecules are far apart
34. Solids are not easily compressible because
A) Particles are tightly packed
B) Gaps are large
C) They are light
D) They move fast
Answer: A) Particles are tightly packed
35. Liquids have fixed volume but no fixed shape because
A) Molecules move freely but remain close
B) Molecules are far apart
C) Strong bonds
D) Constant collisions
Answer: A) Molecules move freely but remain close
36. The three main states of matter are
A) Solid, Liquid, Gas
B) Solid, Water, Ice
C) Metal, Nonmetal, Gas
D) Iron, Wood, Water
Answer: A) Solid, Liquid, Gas
37. The force of attraction is strongest in
A) Solids
B) Liquids
C) Gases
D) Vapors
Answer: A) Solids
38. The force of attraction is weakest in
A) Gases
B) Solids
C) Liquids
D) Ice
Answer: A) Gases
39. The random motion of particles in a fluid is called
A) Brownian motion
B) Wave motion
C) Simple motion
D) Electric motion
Answer: A) Brownian motion
40. Brownian motion is evidence that
A) Matter is made of moving particles
B) Molecules are fixed
C) Gases are heavy
D) Solids don’t move
Answer: A) Matter is made of moving particles
41. When temperature increases, the average kinetic energy of particles
A) Increases
B) Decreases
C) Remains constant
D) Becomes zero
Answer: A) Increases
42. The term “kinetic” means
A) Motion
B) Static
C) Cold
D) Weight
Answer: A) Motion
43. Gases fill the entire container because
A) Molecules move randomly in all directions
B) They are light
C) They have fixed shape
D) They are dense
Answer: A) Molecules move randomly in all directions
44. When a gas is compressed, its pressure
A) Increases
B) Decreases
C) Remains constant
D) Becomes zero
Answer: A) Increases
45. The term “diffusion” applies to
A) Solids, liquids, and gases
B) Solids only
C) Liquids only
D) Gases only
Answer: A) Solids, liquids, and gases
46. The diffusion rate is highest in
A) Gases
B) Liquids
C) Solids
D) Metals
Answer: A) Gases
47. The kinetic theory of gases explains
A) Pressure, temperature, and volume relations
B) Magnetism
C) Electricity
D) Sound waves
Answer: A) Pressure, temperature, and volume relations
48. The collisions of gas molecules are
A) Perfectly elastic
B) Inelastic
C) Sticky
D) Irregular
Answer: A) Perfectly elastic
49. The average distance between collisions is called
A) Mean free path
B) Mean speed
C) Mean distance
D) Range
Answer: A) Mean free path
50. The kinetic energy of gas molecules depends only on
A) Temperature
B) Pressure
C) Volume
D) Density
Answer: A) Temperature
51. The kinetic theory assumes that the volume of gas molecules themselves is
A) Negligible compared to total gas volume
B) Equal to container volume
C) Half of container volume
D) Zero
Answer: A) Negligible compared to total gas volume
Explanation: The molecules occupy very little space compared to the total volume of gas.
52. According to the kinetic theory, gas molecules move
A) Randomly in all directions
B) Only upward
C) In fixed circles
D) In straight lines toward the walls only
Answer: A) Randomly in all directions
Explanation: Molecules of gases move freely and randomly, colliding with each other and the walls.
53. Gas pressure increases with temperature because
A) Molecules move faster and hit walls more often
B) Molecules slow down
C) Volume decreases
D) Molecules stop moving
Answer: A) Molecules move faster and hit walls more often
54. The average speed of gas molecules increases when
A) Temperature increases
B) Pressure increases
C) Volume decreases
D) Gas cools down
Answer: A) Temperature increases
55. At a given temperature, all gases have the same
A) Average kinetic energy per molecule
B) Volume
C) Pressure
D) Density
Answer: A) Average kinetic energy per molecule
Explanation: The kinetic energy depends only on temperature, not on the type of gas.
56. The pressure of a gas is due to
A) Collisions of molecules with the walls of the container
B) Attraction between molecules
C) Weight of the gas
D) Gravity
Answer: A) Collisions of molecules with the walls of the container
57. Gas molecules exert no force on each other except during
A) Collisions
B) Heating
C) Cooling
D) Expansion
Answer: A) Collisions
58. The gas molecules are in constant
A) Random motion
B) Rest
C) Fixed orbit
D) Rotation only
Answer: A) Random motion
59. The total energy of gas molecules is the sum of
A) Kinetic and potential energies
B) Electrical energy
C) Chemical energy
D) Sound energy
Answer: A) Kinetic and potential energies
60. The pressure of a gas decreases when
A) Temperature decreases
B) Temperature increases
C) Collisions increase
D) Volume decreases
Answer: A) Temperature decreases
61. The diffusion of gases is evidence of
A) Molecular motion
B) Magnetism
C) Heat conduction
D) Elasticity
Answer: A) Molecular motion
62. The random motion of particles suspended in a liquid or gas is called
A) Brownian motion
B) Circular motion
C) Simple motion
D) Vibration
Answer: A) Brownian motion
63. The motion of smoke particles under a microscope provides evidence of
A) Existence of atoms and molecules
B) Magnetic forces
C) Gravitational pull
D) Electric fields
Answer: A) Existence of atoms and molecules
64. The pressure of a gas depends on
A) Number of molecules and their speed
B) Color of container
C) Shape of container
D) Direction of flow
Answer: A) Number of molecules and their speed
65. When a gas is heated at constant volume, pressure
A) Increases
B) Decreases
C) Remains constant
D) Becomes zero
Answer: A) Increases
66. When gas is compressed, its molecules
A) Move closer together
B) Move farther apart
C) Remain fixed
D) Stop colliding
Answer: A) Move closer together
67. The kinetic theory assumes that molecular collisions are
A) Perfectly elastic
B) Perfectly inelastic
C) Sticky
D) Partially elastic
Answer: A) Perfectly elastic
68. The temperature of a substance is directly related to
A) Average kinetic energy of its particles
B) Potential energy
C) Chemical energy
D) Electrical energy
Answer: A) Average kinetic energy of its particles
69. The pressure exerted by a gas is proportional to
A) Number of collisions per second
B) Size of molecules
C) Shape of container
D) Color of walls
Answer: A) Number of collisions per second
70. The volume occupied by gases is mostly
A) Empty space
B) Solid matter
C) Dense molecules
D) Heavy atoms
Answer: A) Empty space
71. The kinetic theory explains
A) Gas laws
B) Ohm’s law
C) Newton’s laws
D) Faraday’s laws
Answer: A) Gas laws
72. As temperature increases, intermolecular forces
A) Decrease
B) Increase
C) Remain constant
D) Become zero instantly
Answer: A) Decrease
73. The motion of gas molecules is
A) Constant, random, and rapid
B) Slow and uniform
C) Irregular and stationary
D) Only upward
Answer: A) Constant, random, and rapid
74. The average distance a molecule travels before colliding with another is
A) Mean free path
B) Displacement
C) Kinetic path
D) Random gap
Answer: A) Mean free path
75. The pressure of a gas increases if
A) Volume decreases
B) Temperature decreases
C) Molecules slow down
D) Collisions reduce
Answer: A) Volume decreases
76. The speed of diffusion is highest in
A) Light gases
B) Heavy gases
C) Liquids
D) Solids
Answer: A) Light gases
Explanation: Lighter molecules move faster due to less mass.
77. When a solid melts, its particles
A) Gain kinetic energy
B) Lose kinetic energy
C) Stop moving
D) Remain fixed
Answer: A) Gain kinetic energy
78. Cooling a gas reduces
A) Speed of its molecules
B) Number of molecules
C) Pressure
D) Both A and C
Answer: D) Both A and C
Explanation: Lower temperature reduces molecular speed, lowering gas pressure.
79. The Brownian motion occurs due to
A) Collisions of invisible molecules with visible particles
B) Gravitational pull
C) Magnetic field
D) Light waves
Answer: A) Collisions of invisible molecules with visible particles
80. The state of matter with weakest intermolecular forces is
A) Gas
B) Liquid
C) Solid
D) Plasma
Answer: A) Gas
81. The state of matter with definite shape and volume is
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: A) Solid
82. The state of matter with definite volume but no definite shape is
A) Liquid
B) Solid
C) Gas
D) Plasma
Answer: A) Liquid
83. Gases have neither definite shape nor volume because
A) Molecules move freely and far apart
B) Molecules are heavy
C) They contain ions
D) They are magnetic
Answer: A) Molecules move freely and far apart
84. Increasing temperature of a liquid increases
A) Rate of evaporation
B) Density
C) Freezing
D) Cooling
Answer: A) Rate of evaporation
85. Diffusion occurs faster in
A) Gases than liquids
B) Liquids than solids
C) Solids than gases
D) Metals
Answer: A) Gases than liquids
86. Matter expands on heating because
A) Molecules move faster and push apart
B) Molecules shrink
C) Attraction increases
D) Motion stops
Answer: A) Molecules move faster and push apart
87. When a gas expands, its density
A) Decreases
B) Increases
C) Remains same
D) Becomes infinite
Answer: A) Decreases
88. The molecular theory of matter supports the
A) Particle nature of matter
B) Wave nature of light
C) Static nature of solids
D) Chemical theory
Answer: A) Particle nature of matter
89. The Brownian motion is more vigorous at
A) Higher temperature
B) Lower temperature
C) Freezing point
D) Constant pressure
Answer: A) Higher temperature
90. The internal energy of matter increases when
A) Temperature rises
B) Pressure falls
C) Volume decreases
D) Cooling occurs
Answer: A) Temperature rises
91. The molecules of a gas move in
A) Straight lines between collisions
B) Circles
C) Random curves
D) Spiral paths
Answer: A) Straight lines between collisions
92. The kinetic theory of gases was developed by
A) Maxwell and Boltzmann
B) Newton and Faraday
C) Dalton and Curie
D) Einstein and Planck
Answer: A) Maxwell and Boltzmann
93. The absolute zero temperature is the temperature at which
A) Molecular motion stops
B) Water freezes
C) Ice melts
D) Metal expands
Answer: A) Molecular motion stops
94. The physical properties of gases can be explained by
A) Kinetic theory of gases
B) Atomic theory
C) Thermionic emission
D) Nuclear theory
Answer: A) Kinetic theory of gases
95. At high temperature, gas molecules moveA) Faster
B) Slower
C) Randomly
D) Not at all
Answer: A) Faster
96. At low temperature, the kinetic energy of molecules
A) Decreases
B) Increases
C) Becomes constant
D) Doubles
Answer: A) Decreases
97. The evidence that air exerts pressure is given by
A) Behavior of balloons and syringes
B) Diffusion of ink
C) Motion of solids
D) Conductivity of metals
Answer: A) Behavior of balloons and syringes
98. When temperature is increased, gas pressure rises because
A) Molecules collide more frequently and with more force
B) Molecules stop moving
C) Volume shrinks
D) Gas escapes
Answer: A) Molecules collide more frequently and with more force
99. The concept of kinetic theory helps explain
A) Expansion of solids, liquids, and gases on heating
B) Sound waves only
C) Magnetism
D) Gravity
Answer: A) Expansion of solids, liquids, and gases on heating
100. The main idea of the kinetic theory of matter is that
A) All matter is made of tiny particles in constant motion
B) Matter is continuous and still
C) Matter is uniform throughout
D) Particles remain fixed
Answer: A) All matter is made of tiny particles in constant motion