5th Class General Science Chapter 5 Physical and Chemical Changes of Matter MCQs (طبیعی اور کیمیائی تبدیلیاں) | PAK MCQs

Matter is correct because it is the fundamental building block of all physical substances found in the universe.

Mass and occupies space is correct as matter is defined as anything that has weight and takes up a certain volume of space.

Three is correct because matter primarily exists in three forms: solid, liquid, and gas, depending on conditions.

Solid, liquid, and gas is correct because these terms describe the different forms matter takes based on particle movement.

The arrangement of particles is correct because particles are tightly packed in solids and spread out in gases.

Appearance is correct because a physical change only alters the outer look, shape, or state of matter without creating a new substance.

Chemical composition is correct because the internal molecules and atoms that make up the substance do not change during this process.

Physical change is correct because the salt is still present in the water and can be recovered by simple means.

State of matter is correct because the solid salt changes its form into a liquid solution without becoming a new substance.

Matter with new properties is correct because no chemical reaction occurs, and both salt and water keep their original characteristics.

It can be reversed is correct because a physical change allows you to separate the components back into their original forms.

Salt is correct because during evaporation, only the liquid turns into gas, leaving the solid salt particles behind.

A change is observed is correct because the physical force of the hammer alters the state and appearance of the can.

It has squeezed and its shape has changed is correct because crushing only modifies the external form of the metal without changing what it is made of.

Physical change is correct because the aluminum's chemical identity remains the same even though its physical appearance is altered.

No, it does not change into a new matter is correct because the material remains aluminum; only its size and shape are compressed.

It melts is correct because solid wax changes into a liquid state when heat is applied to it.

Liquid is correct because heating provides energy to the particles of solid wax, allowing them to flow freely.

It freezes is correct because removing heat causes the liquid wax to lose energy and turn back into a solid.

Solid is correct because the particles of wax rearrange themselves into a fixed structure upon cooling.

Physical state of matter is correct because these changes only alter the form of the wax, not its internal chemical identity.

Melting is correct because it is the physical process where a solid turns into a liquid when it receives enough heat energy.

Liquid state is correct because heating provides energy to the wax, causing it to lose its rigid solid form.

It becomes water on melting is correct because ice is the solid form of water, and heat causes it to undergo a phase change.

They keep on vibrating is correct because particles in a solid are packed closely and can only move back and forth in place.

They start vibrating faster is correct because added heat increases the kinetic energy of the particles, causing more rapid movement.

They become weaker is correct because as particles vibrate faster and move apart, the bonds holding them together lose their strength.

Its liquid state is correct because when particles are no longer fixed in place, they start flowing, which is a property of liquids.

It freezes and turns to ice is correct because the low temperature in the freezer removes energy from the water, turning it into a solid form.

Heat is correct because for a liquid to freeze, it must lose its thermal energy to the surroundings so its particles can slow down.

It becomes slower is correct because losing heat reduces the energy of the particles, making them vibrate less.

They come closer to each other is correct because as particles lose energy, they pack tightly together to form a solid structure.

It becomes stronger is correct as particles come closer and settle into fixed positions to form a solid.

Solid is correct because freezing is a phase transition where a substance changes from a liquid to a solid form.

Freezing is the correct scientific term for the solidification of a liquid when it is cooled below its freezing point.

It becomes faster is correct because heating adds energy to the particles, which increases their kinetic energy and speed.

The space increases is correct because as particles move faster, they push away from each other, creating more distance between them.

Vapours or gas is correct because boiling is a phase change where a liquid turns into its gaseous form due to high heat.

Boiling is correct because it is the scientific name for the rapid vaporization of a liquid when it reaches its boiling point.

Water evaporates into the air is correct because liquid water on the surface changes into gas and mixes with the surrounding atmosphere.

Evaporation is correct because it is the process where water from wet surfaces is released into the air as vapours.

Canals, lakes, and oceans is correct because large wet surfaces allow water to turn into vapours all the time due to environmental heat.

From snow and plant leaves is correct because evaporation is a natural process that happens on any surface containing moisture, including frozen snow.

As water vapours is correct because in evaporation, water molecules gain enough energy to leave the liquid state and become invisible gas.

At the external surface is correct because moisture from the air turns into visible droplets on the outside of the cold container.

From the water vapours in air is correct because the invisible gas in the atmosphere touches the cold glass and turns back into liquid water.

Heat is released is correct because the particles lose their thermal energy to the cold surface, causing them to slow down and condense.

Liquid is correct because condensation is a phase change where a gas (vapour) cools down and becomes a liquid.

Condensation is correct because it is the scientific term for the conversion of a substance from the vapor state to the liquid state.

Due to evaporation is correct because the water in the wet clothes absorbs heat from the air and turns into vapours, leaving the cloth dry.

High temperature is correct because boiling only occurs when a liquid is heated enough to reach its specific boiling point.

At any temperature is correct because unlike boiling, evaporation is a surface phenomenon that happens slowly even at low temperatures.

It becomes rapid is correct because more heat energy allows water molecules to turn into vapours much faster than at low temperatures.

Owing to the process of evaporation is correct because as sweat evaporates, it takes heat away from our body, producing a cooling effect.

It will not dissolve is correct because sand is an insoluble substance that settles at the bottom of the water instead of mixing into it.

It will completely dissolve is correct because sugar is a soluble matter that breaks down and mixes evenly with water molecules.

It stays as a separate layer is correct because oil and water do not mix due to different densities, so the oil floats on top.

Mixture is correct because it refers to a physical combination of different materials where each part keeps its identity.

They retain their original properties is correct because in a mixture, no chemical reaction occurs, so substances like salt or sugar still taste the same.

Homogenous or heterogeneous is correct because these terms describe whether a mixture looks the same throughout or has visible different parts.

Solutions is correct because in these mixtures, the particles are so well mixed that they appear as a single phase.

Oxygen and carbon dioxide is correct because air is a gaseous mixture of different vital gases needed for life and the environment.

Sugar, water, and CO2 is correct because these constituents combine to create the sweet and fizzy taste of soft drinks.

Different metals is correct because alloys are solid mixtures created by combining two or more metallic elements to improve strength.

By physical methods is correct because the components of a heterogeneous mixture are not chemically bonded, so they can be sorted using tools or hands.

Heterogeneous mixture is correct because you can clearly see and pick out the individual different parts like tomatoes and broccoli in a salad.

Heterogeneous mixture is correct because soil contains non-uniform materials like stones and clay that are not mixed evenly throughout.

Stone, clay, and decaying plant material is correct because these diverse parts show that the mixture contains many different substances and even living things.

Solution is correct because it is a uniform mixture formed when a solute is completely and evenly distributed within a solvent.

Solute is correct because it refers to the component of a solution that is present in a smaller amount and gets dissolved.

Sugar and salt is correct as these are common solid substances that dissolve in liquids to form a solution.

Solvent is correct because it is the medium (usually a liquid) that makes up the bulk of the solution and performs the dissolving action.

Water is correct because it is known as a universal solvent that can dissolve many different types of solutes.

Two is correct because every simple solution is made up of exactly two parts: the solute and the solvent.

Stirring is correct because it is the physical act of moving a liquid to help a solute mix more rapidly with a solvent.

It will dissolve soon is correct because stirring increases the movement of particles, allowing the sugar to break down into the water much faster.

It will take more time is correct because without the help of stirring, the particles must move on their own to mix, which is a very slow process.

Beaker A (Hot water) is correct because heat provides more energy to water particles, allowing them to break down and mix with the sugar more quickly.

Powdered sugar is correct because small particles have more surface area, allowing them to mix with water much faster than a solid cube.

Size of particles is correct because the physical dimensions of the solute determine how efficiently the solvent can break it down into a solution.

Smaller particles dissolve faster is correct because they allow the solvent to surround and break them down more quickly than large chunks.

Solutions is correct because milk, tea, and soft drinks are all mixtures where different substances are dissolved evenly together.

Dilute solution is correct because it refers to a mixture that has a very small amount of dissolved material compared to the liquid.

Concentrated solution is correct as it describes a strong solution that contains a high amount of dissolved substance.

The quantity of solute is correct because the concentration of any solution is defined by how much solute (like sugar) is added to the solvent.

They are being decomposed is correct because organic materials naturally break down over time due to the action of microorganisms, turning into simpler matter.

Iron gates and windows is correct because rust specifically forms on iron surfaces when they react with moisture and oxygen in the air.

Chemical changes is correct because both decomposition and rusting involve the formation of new substances with entirely different properties.

Papers is correct because paper is an organic material that breaks down naturally over time, similar to plant-based items.

Both appearance and composition change is correct because a chemical change creates a new substance with a different internal arrangement of particles.

Chemical change is correct as it involves a chemical reaction that transforms the original matter into something entirely new.

They disappear through decomposition is correct because natural processes break down organic waste until it is no longer visible in the environment.

Bacteria and fungi is correct because these microorganisms obtain their nutrients by breaking down the complex structures of dead matter.

Simple components is correct because the process of decay converts complicated organic tissues into basic elements that mix back into the soil.

Decaying is correct because it specifically refers to the biological breakdown and rot of organic materials caused by bacteria and fungi.

To cook food is correct because the heat produced by burning fuel in a stove is used to prepare raw ingredients for eating.

The flame is correct because it is the visible, gaseous part of a fire that appears when fuel undergoes a rapid chemical reaction.

Combustion reaction is correct as it is the chemical process where a substance reacts with oxygen to produce heat and light.

Burning is correct because it is the common term used for the combustion of materials to produce energy.

Burning of coal and wood is correct because these materials react with oxygen to form new substances like ash and smoke.

Paper and match stick are correct because they are easily combustible materials that catch fire to produce heat and light.

Test Tube A is correct because both water and oxygen were available here, providing the necessary conditions for rusting to occur.

Brown is correct because rust is a reddish-brown substance that forms on the surface of iron during a chemical reaction.

Oxygen is correct because it reacts with the metal in the presence of moisture to create a new chemical compound called iron oxide.

Rusting is correct because it is the specific chemical change that gradually destroys iron objects when they are exposed to a damp environment.

Oxygen and Water is correct because rusting cannot happen if either of these two essential components is missing from the environment.

Oil or chromium is correct because these substances provide a protective coating that prevents the iron from reacting with air and moisture.

To prevent rusting is correct because the paint creates a barrier that stops oxygen and water from reaching the metal underneath.

Oxygen and Water are correct as these are the essential reactants for rust, and a layer of oil prevents them from touching the iron.

Two is correct because the text categorizes all changes in matter into two primary types: physical changes and chemical changes.

Physical change is correct because it only affects the appearance or state of a substance without altering its internal identity.

Physical change can be reversed is correct because, like melting and freezing wax, the material can often be returned to its original state.

Wax is correct because the identity of the material does not change during melting or freezing, confirming it is a physical process.

Chemical change is correct because it involves a reaction that transforms the original substance into something with entirely new properties.

Because ash is formed is correct as the creation of a new substance (ash) shows that a chemical reaction has permanently changed the paper.

The chemical change cannot be reversed is correct because once a chemical change occurs, the new material cannot usually be turned back into the original substance.