Particulate Nature of Matter
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Matter and Its Composition
SubtopicMatter and Its Composition under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Particles of matter move faster in:
A.Cold water
B.Hot water
C.Ice
D.None of these
- 2.
The standard unit of mass in the SI system is:
A.Gram
B.Kilogram
C.Milligram
D.Pound
- 3.
Which state of matter has the property of filling its container completely?
A.Solid
B.Liquid
C.Gas
D.Stone
- 4.
At , water exists in the form of:
A.Only ice
B.Only liquid water
C.Both liquid water and steam
D.Only plasma
- 5.
Which of the following correctly describes a 'compound'?
A.It can be separated into its components by physical methods.
B.Its properties are the same as its constituent elements.
C.It has a fixed composition by mass.
D.It is a heterogeneous mixture.
- 6.
An example of a highly compressible substance is:
A.Oxygen gas
B.Mustard oil
C.Copper wire
D.Ice cube
- 7.
Which of the following processes is responsible for the formation of water droplets on the outer surface of a glass containing ice-cold water?
A.Evaporation
B.Condensation
C.Sublimation
D.Fusion
- 8.
Substance X has no definite shape but has a definite volume. Substance Y has no definite shape and no definite volume. Which of the following is true about the intermolecular forces in X and Y?
A.Forces in X are stronger than in Y.
B.Forces in Y are stronger than in X.
C.Forces in X and Y are of equal strength.
D.Substance X has zero intermolecular force.
- 9.
What happens to the density of a substance when it is heated without a change in its state?
A.Density increases because particles move faster.
B.Density decreases because the volume increases due to increased intermolecular space.
C.Density remains constant because mass and volume don't change.
D.Density increases because the mass of the particles increases.
- 10.
Which of the following demonstrates that particles of matter are very small and have a large number in even a small volume?
A.A piece of chalk breaking into smaller pieces.
B.Diluting a small amount of dye in water several times and still seeing the color.
C.Water taking the shape of the container it is poured into.
D.The hardness of a diamond.
Download the worksheet for Particulate Nature of Matter - Matter and Its Composition to practice offline. It includes additional chapter-level practice questions.
States of Matter and Interparticle Space
SubtopicStates of Matter and Interparticle Space under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Why does a gas cylinder contain a large amount of gas?
A.Because gas particles are very large
B.Because gases have high compressibility
C.Because gases have no mass
D.Because the cylinder is made of rubber
- 2.
The mass per unit volume of a substance is called:
A.Weight
B.Area
C.Density
D.Pressure
- 3.
Diffusion occurs because particles are in a state of:
A.Rest
B.Constant motion
C.Fixed vibration
D.Strong attraction
- 4.
Which of the following describes the shape and volume of a wooden block?
A.Fixed shape and fixed volume
B.Fixed shape but no fixed volume
C.No fixed shape but fixed volume
D.No fixed shape and no fixed volume
- 5.
Which of the following statements about 'Brownian motion' is true?
A.It is only observed in solids.
B.It is the zigzag motion of particles caused by collisions with invisible particles of the medium.
C.It proves that particles of matter are stationary.
D.It is caused by the attraction of gravity on small particles.
- 6.
Which property allows us to store large amounts of Oxygen gas in small cylinders for hospital use?
A.High fluidity
B.High compressibility
C.High density
D.Low interparticle space
- 7.
What is the effect of adding more pressure on the particles of a gas kept in a closed container?
A.The particles will move further apart.
B.The interparticle space will decrease.
C.The kinetic energy of the particles will always decrease.
D.The particles will increase in size.
- 8.
Based on the particulate theory, why do gases exert pressure on the walls of their container?
A.The particles are heavy and rest on the walls.
B.The particles are constantly moving and colliding with the walls.
C.The particles expand to push the walls outward.
D.The interparticle forces of attraction pull the walls inward.
- 9.
When we convert Liquid Nitrogen into Nitrogen gas, the volume increases by nearly 700 times. This provides evidence that:
A.Gas particles are 700 times larger than liquid particles.
B.The interparticle space in the gas is much larger than in the liquid.
C.New particles are created during the heating process.
D.The mass of the substance increases during vaporization.
- 10.
A sponge can be compressed easily even though it is a solid. Why?
A.It is not a true solid.
B.It has minute holes in which air is trapped; when pressed, the air is expelled.
C.The interparticle space in sponge particles is naturally very large.
D.Sponge particles are liquid-like and can flow.
Download the worksheet for Particulate Nature of Matter - States of Matter and Interparticle Space to practice offline. It includes additional chapter-level practice questions.
Melting point and Change of State
SubtopicMelting point and Change of State under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Water at room temperature is a liquid because:
A.It has no shape
B.It has a fixed volume and can flow
C.It has very high kinetic energy
D.It is made of gas
- 2.
Which state of matter can be compressed to a large extent?
A.Gas
B.Solid
C.Liquid
D.Wood
- 3.
Matter is defined as anything that has mass and occupies:
A.Area
B.Space
C.Weight
D.Length
- 4.
Which of the following is a characteristic of particles of matter?
A.They are stationary
B.They have no space between them
C.They attract each other
D.They are large in size
- 5.
The density of a substance generally ________ when it changes from a solid state to a liquid state.
A.Increases
B.Decreases
C.Remains same
D.Doubles
- 6.
Convert into the Celsius scale.
A.B.C.D. - 7.
What happens to the movement of particles when a liquid is cooled down to its freezing point?
A.The particles start moving faster
B.The particles lose kinetic energy and slow down
C.The particles move further apart
D.The particles stop moving entirely
- 8.
Which of the following statements about the latent heat of fusion is true?
A.It is the energy required to raise the temperature of a solid by .
B.It is the energy required to change of solid to liquid without a change in temperature.
C.It depends on the rate of heating.
D.It is always equal to the latent heat of vaporization.
- 9.
What determines whether a substance will melt or sublimate when heated at a specific pressure?
A.The color of the substance.
B.The relationship between the external pressure and the substance's triple point pressure.
C.The speed at which heat is applied.
D.The specific heat of the gas phase.
- 10.
How does the addition of a non-volatile solute affect the vapor pressure of the liquid phase at the melting point?
A.It increases the vapor pressure.
B.It decreases the vapor pressure, leading to a depression in the freezing point.
C.It has no effect on vapor pressure.
D.It makes the vapor pressure equal to the solid's vapor pressure at a higher temperature.
Download the worksheet for Particulate Nature of Matter - Melting point and Change of State to practice offline. It includes additional chapter-level practice questions.
What Is Matter Composed of?
SubtopicWhat Is Matter Composed of? under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Everything in this universe is made up of material which scientists have named __________.
A.Ether
B.Matter
C.Plasma
D.Atom
- 2.
Which state of matter has the highest density generally?
A.Gas
B.Liquid
C.Solid
D.Vapor
- 3.
The smell of perfume spreads in a room due to __________.
A.Evaporation
B.Diffusion
C.Precipitation
D.Condensation
- 4.
Which of the following is a property of particles of matter?
A.They are very large
B.They are stationary
C.They have spaces between them
D.They have no mass
- 5.
A student is shown four different particulate representations of matter. Which of the following cases specifically illustrates a pure substance that is a compound, according to the arrangement of its particles?
A.Case A: Individual identical atoms floating separately
B.Case B: Pairs of identical atoms bonded together
C.Case C: Pairs of different types of atoms bonded together
D.Case D: A mixture of two different types of unbonded atoms
- 6.
A gas is contained in a cylinder with a movable piston. If the piston is pushed inward to compress the gas at a constant temperature, which of the following remains unchanged at the particulate level?
A.The size of the individual gas particles
B.The average distance between the gas particles
C.The frequency of collisions between the particles and the walls
D.The total space available for the particles to move
- 7.
In which of the following, the distance between the constituent particles is the maximum?
A.Ice
B.Liquid Water
C.Steam
D.Liquid Mercury
- 8.
Which of the following can be compressed most easily?
A.A block of wood
B.A beaker of water
C.A balloon filled with air
D.A glass of milk
- 9.
Which factor determines the state (solid, liquid, or gas) of a substance at a given temperature and pressure?
A.Only the mass of the particles.
B.Only the speed of the particles.
C.The balance between the intermolecular force of attraction and the kinetic energy of the particles.
D.The color and transparency of the substance.
- 10.
The molecular mass of is:
A.B.C.D.
Download the worksheet for Particulate Nature of Matter - What Is Matter Composed of? to practice offline. It includes additional chapter-level practice questions.
What Decides Different States of Matter?
SubtopicWhat Decides Different States of Matter? under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Which of the following is an example of the particulate nature of matter?
A.A shadow
B.Sunlight
C.Dissolving potassium permanganate in water
D.Electric current
- 2.
What happens to the intermolecular space when a liquid changes to a gas?
A.It increases
B.It decreases
C.It remains the same
D.It becomes zero
- 3.
Which of the following increases the rate of diffusion?
A.Decreasing temperature
B.Increasing temperature
C.Increasing particle size
D.Decreasing the surface area
- 4.
Which state of matter has particles that vibrate about their fixed positions?
A.Solid
B.Liquid
C.Gas
D.Vapor
- 5.
Which state of matter consists of super-energetic and super-excited particles in the form of ionized gases?
A.Solid
B.Liquid
C.Gas
D.Plasma
- 6.
On the Celsius scale, the boiling point of water is C. What is this temperature on the Kelvin scale?
A.K
B.K
C.K
D.K
- 7.
A gas can be compressed into a small volume because its particles:
A.Are very small
B.Have large spaces between them
C.Have high kinetic energy
D.Have a fixed position
- 8.
Convert to the Kelvin scale.
A.B.C.D. - 9.
Which of the following quantities remains constant for a gas when it is compressed at a constant temperature?
A.Density
B.Intermolecular space
C.Mass of the gas
D.Volume
- 10.
Why does a desert cooler cool better on a hot dry day than on a hot humid day?
A.In dry air, the rate of evaporation is higher, leading to more cooling.
B.Humidity increases the kinetic energy of water particles.
C.Dry air prevents water from evaporating.
D.The fan in the cooler works better in dry air.
Download the worksheet for Particulate Nature of Matter - What Decides Different States of Matter? to practice offline. It includes additional chapter-level practice questions.
Solid state
SubtopicSolid state under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
When compared to gases, solids have:
A.More intermolecular space
B.Higher kinetic energy
C.Higher intermolecular force
D.Higher compressibility
- 2.
What is the SI unit of density?
A.B.C.D. - 3.
The melting of ice into water is a:
A.Chemical change
B.Physical change
C.Both A and B
D.None of these
- 4.
Which of the following has the strongest intermolecular force of attraction?
A.Water
B.Alcohol
C.Iron
D.Oxygen
- 5.
Substance X and Substance Y are two different solids. Even though they have the same external volume, Substance Y is found to have a much higher mass than Substance X. Which particulate characteristic explains this difference?
A.Particles of Y are much larger in size than particles of X
B.Particles of Y have significantly more space between them than X
C.Particles of Y are more closely packed than particles of X
D.Particles of Y have weaker attractive forces than particles of X
- 6.
A block of solid iron is melted and then cooled in a mold to create several small iron bolts. According to the particulate nature of matter, which of the following remains unchanged throughout this entire process?
A.The total volume occupied by the iron
B.The total number of iron particles
C.The fixed arrangement of the particles
D.The average kinetic energy of the particles
- 7.
The crystalline state is a characteristic of which form of matter?
A.Gaseous
B.Liquid
C.Solid
D.Plasma
- 8.
When a solid dissolves in a liquid, where do the solid particles go?
A.They disappear into thin air.
B.They occupy the spaces between the particles of the liquid.
C.They increase the volume of the liquid exponentially.
D.They settle at the top of the liquid.
- 9.
The melting point of a solid is an indication of the:
A.Strength of the force of attraction between its particles.
B.Number of particles in the solid.
C.Size of the solid block.
D.Molecular weight of the substance only.
- 10.
Which of the following factors does NOT affect the state of matter?
A.Temperature
B.Pressure
C.Atomic number of the elements
D.Intermolecular forces
Download the worksheet for Particulate Nature of Matter - Solid state to practice offline. It includes additional chapter-level practice questions.
Liquid state
SubtopicLiquid state under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
In a liquid, the particles are ____________ packed than in a gas.
A.More closely
B.Less closely
C.Equally
D.Not
- 2.
Particles in a liquid can move because they have:
A.Mass
B.Kinetic energy
C.Potential energy
D.Static electricity
- 3.
Which of these is a liquid used as a fuel?
A.Coal
B.Petrol
C.Wood
D.Natural Gas
- 4.
A liquid has ____________ boundaries.
A.Fixed
B.No fixed
C.Solid
D.Rigid
- 5.
At the particulate level, what is the main difference between the liquid and gaseous states of the same substance?
A.Liquid particles are larger than gas particles.
B.Gas particles have much larger intermolecular spaces and move independently.
C.Liquid particles have no kinetic energy while gas particles do.
D.Gas particles are more attracted to each other than liquid particles.
- 6.
The latent heat of fusion refers to the heat required to change:
A.1 kg of gas to liquid.
B.1 kg of solid to liquid at its melting point.
C.1 kg of liquid to gas at its boiling point.
D.1 kg of liquid to solid.
- 7.
Why is the density of most liquids slightly lower than their solid form?
A.The particles in a liquid are smaller.
B.The particles in a liquid are moving and take up slightly more space on average.
C.Liquid particles have less mass.
D.Liquids contain air bubbles always.
- 8.
Which of the following is the correct decreasing order of 'Force of Attraction' between particles?
A.Sugar > Water > Oxygen
B.Water > Sugar > Oxygen
C.Oxygen > Water > Sugar
D.Sugar > Oxygen > Water
- 9.
What is the physical state of water at and atmosphere pressure?
A.Gaseous (Steam)
B.Liquid
C.Solid
D.Plasma
- 10.
Why do we wear cotton clothes in summer to stay cool, based on the particulate nature of liquids?
A.Cotton absorbs sweat and exposes it to the atmosphere for easy evaporation, which takes latent heat from our body.
B.Cotton molecules react with sweat to produce a cooling chemical.
C.Cotton is a good conductor of heat and transfers body heat to the surroundings.
D.The pores in cotton clothes trap cold air and keep it near the skin.
Download the worksheet for Particulate Nature of Matter - Liquid state to practice offline. It includes additional chapter-level practice questions.
Gaseous state
SubtopicGaseous state under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Which state of matter has the highest kinetic energy of particles?
A.Solid
B.Liquid
C.Gas
D.All have equal
- 2.
Gases like Helium are used in balloons because they are:
A.Heavy
B.Lighter than air
C.Solid
D.Reactive
- 3.
When gas particles collide with each other, they:
A.Stick together
B.Bounce off
C.Break into pieces
D.Stop moving
- 4.
What is the standard unit for measuring the volume of a gas in a laboratory?
A.Kilogram
B.Liter
C.Meter
D.Newton
- 5.
When a gas sample is heated and its volume increases (thermal expansion), as shown in the sequence below, what change occurs to the particles at the molecular level?
A.The mass of each individual gas particle increases.
B.The individual particles expand in size to fill the extra space.
C.The average distance between the gas particles increases.
D.The total number of particles in the container increases.
- 6.
The diagram represents the random, zigzag path of a single gas particle inside a container. What is the physical reason for the abrupt changes in direction at the points labeled A, B, and C?
A.The particle is losing its kinetic energy at those specific points.
B.The particle is undergoing a collision with another particle or the container wall.
C.The particle is being pulled toward the bottom by gravitational force.
D.The particle is reacting to the external magnetic field of the container.
- 7.
In which state of matter are the particles least restricted in their movement?
A.Solid
B.Liquid
C.Gas
D.Both liquid and gas
- 8.
If you mix two gases in a container, they eventually form a homogeneous mixture. This process is driven by:
A.Chemical bonding between gas types.
B.The random motion of particles and large intermolecular spaces.
C.Gravitational sorting of heavier particles.
D.The external pressure pushing them together.
- 9.
Why is it easier to compress a gas than a solid?
A.Gas particles are softer.
B.Gas particles have more kinetic energy.
C.The space between gas particles is much larger than between solid particles.
D.Gases have lower boiling points.
- 10.
Which of the following is true for the 'mean free path' of a gas particle?
A.It is the total distance a particle travels in one hour.
B.It is the average distance a particle travels between two successive collisions.
C.It is the distance between the center of the container and the wall.
D.It is the diameter of the gas particle.
Download the worksheet for Particulate Nature of Matter - Gaseous state to practice offline. It includes additional chapter-level practice questions.
How Does the Interparticle Spacing Vary in Different States of Matter?
SubtopicHow Does the Interparticle Spacing Vary in Different States of Matter? under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Which of the following is NOT matter?
A.Air
B.Water
C.Love
D.Dust
- 2.
The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close. This is because:
A.Cold food has more space
B.Diffusion is faster at higher temperatures
C.Hot food has less space
D.Cold food particles don't move
- 3.
Which state of matter can flow but has a fixed volume?
A.Ice
B.Nitrogen
C.Mercury
D.Steel
- 4.
When a solid undergoes sublimation, it turns into gas. The interparticle spacing:
A.Increases drastically
B.Decreases slightly
C.Remains the same
D.Becomes zero
- 5.
A fixed mass of nitrogen gas is transferred from a flask to an empty flask, as shown in the diagram. Which of the following correctly describes the change in the interparticle spacing of the nitrogen molecules?
A.The interparticle spacing decreases because the molecules now have more room to move around.
B.The interparticle spacing remains unchanged because the mass and the number of molecules have not changed.
C.The interparticle spacing increases because gas particles spread out to occupy the entire volume of the larger flask.
D.The interparticle spacing remains the same, but the individual nitrogen molecules expand to five times their original size.
- 6.
Rigidity is a property of matter where the interparticle spaces are:
A.Variable
B.Very large
C.Minimum and fixed
D.Infinite
- 7.
Potassium permanganate crystals are put in water. The purple color spreads due to:
A.Chemical reaction with water
B.Movement of particles into interparticle spaces
C.Evaporation of water
D.The crystals being heavier than water
- 8.
Why is the density of ice less than that of water, even though ice is a solid?
A.Ice particles have less mass.
B.The interparticle spacing in ice is actually larger than in liquid water due to its crystalline structure.
C.Water particles are larger than ice particles.
D.Ice contains air bubbles that cannot be removed.
- 9.
In the context of interparticle spacing, what is the 'Bose-Einstein Condensate'?
A.A state where particles are extremely far apart.
B.A state where particles move at the speed of light.
C.A state at ultra-low temperatures where particles behave as a single entity with minimal spacing.
D.A state found only in the center of the sun.
- 10.
The property of 'rigidity' in solids is a result of:
A.Large interparticle spacing.
B.High kinetic energy.
C.Minimum interparticle spacing and strong forces.
D.Continuous movement of particles.
Download the worksheet for Particulate Nature of Matter - How Does the Interparticle Spacing Vary in Different States of Matter? to practice offline. It includes additional chapter-level practice questions.
How Particles Move in Different States of Matter
SubtopicHow Particles Move in Different States of Matter under Particulate Nature of Matter for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Which of the following is a liquid at room temperature?
A.Iron
B.Bromine
C.Oxygen
D.Sugar
- 2.
Diffusion occurs because particles are:
A.Heavy
B.Stationary
C.Constantly moving
D.Large
- 3.
The state of matter which is most rigid is:
A.Gas
B.Liquid
C.Solid
D.Vapour
- 4.
Why is it easier to move your hand in air than in a solid block of wood?
A.Air particles have more attraction
B.Air particles have more space and less attraction
C.Wood particles are moving faster
D.Air is not matter
- 5.
Which statement about particle motion is correct?
A.Particles in a solid have no energy.
B.Particles in a liquid only move in one direction.
C.Particles in a gas move at different speeds in random directions.
D.Particles in a vacuum move faster than in a gas.
- 6.
The smell of a used deodorant can be detected even from a distance because its particles:
A.Are large and visible.
B.Move very slowly in air.
C.Mix with air and move rapidly in all directions.
D.Settle down on the floor.
- 7.
When energy is removed from a liquid, and it freezes into a solid, the particles:
A.Gain speed and move apart.
B.Lose speed and get locked into a pattern.
C.Start moving randomly.
D.Stop vibrating entirely.
- 8.
Why does the temperature of a substance not rise during its boiling point even though heat is still being applied?
A.The heat is lost to the surroundings immediately.
B.The heat is used up in changing the state by overcoming the forces of attraction between particles.
C.The thermometer stops working at high temperatures.
D.The particles stop absorbing heat once they reach the boiling point.
- 9.
Which of the following has the highest kinetic energy?
A.Particles of ice at .
B.Particles of water at .
C.Particles of water at .
D.Particles of steam at .
- 10.
A sponge can be compressed even though it is a solid. Why?
A.Sponge is not a solid.
B.Particles of a sponge are very far apart like a gas.
C.It has minute holes in which air is trapped; when pressed, the air is expelled.
D.The particles of a sponge are flexible and can shrink.
Download the worksheet for Particulate Nature of Matter - How Particles Move in Different States of Matter to practice offline. It includes additional chapter-level practice questions.