6th Class General Science Unit 7 MCQs | Mixtures (آمیزے) | PakMCQs

Mixtures is correct because they are impure substances composed of two or more components blended together.

Elements, compounds, or both is correct because mixtures are physical combinations and can contain any chemical form of matter.

Not chemically combined is correct because mixtures represent physical blending without forming new chemical bonds between the ingredients.

Physical combination is correct because the components are simply mixed together and can be separated without chemical reactions.

They retain their properties is correct because physical mixing does not alter the chemical identity of the individual ingredients.

Physical methods is correct because techniques like filtering, sifting, or evaporation can separate mixtures without chemical change.

May or may not be in a fixed proportion is correct because the components of a mixture can be blended in any random quantities.

Two is correct because mixtures are broadly classified into two categories based on how evenly their components are distributed.

Homogeneous and heterogeneous is correct because mixtures either have a uniform composition throughout or visible, separate parts.

Homogeneous mixture is correct because its components are distributed so evenly that the entire mixture behaves as a single phase.

No, we cannot is correct because the components dissolve and blend at a microscopic molecular level, hiding individual boundaries.

All of the above is correct because sugar water, atmospheric air, lemonade, and carbonated sodas all have perfectly uniform physical compositions.

Solution is correct because a solution is defined as a uniform mixture of solutes completely dissolved within a solvent.

Same is correct because the prefix "homo-" comes from a Greek word meaning identical or uniform.

Different is correct because the prefix "hetero-" comes from a Greek word used to indicate diversity or distinct components.

Heterogeneous mixture is correct because its components remain physically separate and are not evenly distributed.

Heterogeneous mixture is correct because the distinct boundaries between the mixed substances remain clearly visible to the naked eye.

All of the above is correct because pebbles in sand, oil in water, and sulfur mixed with iron filings all maintain clearly separate, visible parts.

Mixture of different substances is correct because mineral water consists of dissolved natural mineral salts blended physically into liquid H2O.

Homogeneous mixture is correct because the minerals are completely dissolved and evenly distributed, making the liquid look uniform and clear.

A mixture is correct because the iron and sulfur particles are only physically touching and can still be separated easily using a magnet.

A compound (iron sulphide) is correct because heating provides the thermal energy required for iron and sulfur atoms to bond chemically.

Chemical reaction is correct because new chemical bonds are created, forming an entirely new substance with different properties.

Melting and boiling points is correct because every unique substance or mixture undergoes phase transitions at specific temperature ranges.

Their composition is correct because the chemical identity and atomic arrangement of components determine how much heat is needed to alter their states.

Element is correct because it is the most basic chemical substance, defined by a single type of atomic structure.

All are identical is correct because a pure element contains only one atomic species with the exact same atomic properties.

Atom or molecule is correct because some elements exist as monoatomic (like helium) while others exist naturally as diatomic molecules (like oxygen).

Fixed is correct because pure chemical substances possess sharp, constant, and highly predictable phase transition temperatures.

No new substance is formed is correct because elements are fundamental entities and do not change identity without a chemical reaction with another element.

Mixture is correct because it represents a physical blend of components that maintain their separate chemical identities.

They retain original properties is correct because the components do not undergo any chemical reaction during physical mixing.

Can be separated easily is correct because simple physical methods such as sifting, filtration, or evaporation are sufficient to isolate the components.

No fixed melting and boiling point is correct because a mixture's phase transitions occur over a range of temperatures depending on its variable composition.

No new substances are formed is correct because a mixture is created through physical interaction, which does not synthesize new chemical molecules.

Chemically combined is correct because forming a compound requires elements to form chemical bonds, sharing or transferring electrons.

Completely different is correct because chemical reactions alter electron arrangements, yielding substances with entirely new physical and chemical behaviors.

Difficult to separate is correct because breaking strong chemical bonds requires chemical reactions or intense energy input, unlike simple physical separation.

Fixed is correct because pure chemical compounds possess sharp, constant, and highly predictable phase transition temperatures due to their uniform composition.

New substances are formed is correct because a chemical reaction rearranges atoms into entirely new molecular configurations with distinct identities.

Melting point is correct because it is the specific temperature threshold where a solid lattice breaks down into a fluid.

Boiling point is correct because it represents the constant temperature where liquid molecules gain enough kinetic energy to vaporize rapidly.

Mercury and Aluminium is correct because they consist entirely of single, identical atomic species listed on the periodic table.

Both (A) and (B) is correct because water (H2O) and table salt (NaCl) contain different atomic elements bonded chemically in fixed proportions.

Juice is correct because it contains water, sugars, fruit extracts, and organic compounds blended together physically without chemical bonds.

Pure substance is correct because it consists of only one type of particle (atoms or molecules) with uniform physical and chemical properties.

Elements and compounds is correct because both represent uniform, stable chemical structures with constant compositions.

Mixture is correct because it is composed of physical components that retain their original properties and can be separated easily.

Elements and compounds is correct because they both have uniform, definite compositions of single atoms or chemically bonded molecules.

Mixtures is correct because they consist of physically combined, non-bonded substances that make them impure.

Both (A) and (B) is correct because oxygen, hydrogen, and iron are listed under pure, single-atom elements.

Both (A) and (B) is correct because water, table salt, and ammonia contain different atoms bonded in strict, fixed chemical ratios.

All of the above is correct because salt water, mouthwash, and metallic alloys all show perfectly uniform physical compositions throughout.

Homogeneous mixtures is correct because metal alloys are solid solutions with completely uniform atom distributions.

Salad and Solid waste dump is correct because their distinct, separate physical components are easily visible to the naked eye.

Mixture (alloy) is correct because steel is physically formulated by combining iron with carbon to enhance its strength.

Mixture of metal with metal or non-metal is correct because alloys physically combine metallic bases with other stabilizing elements.

Cast iron is correct because it is a solid solution composed of iron metal modified by carbon to make it hard and stable.

Iron and carbon is correct because adding small amounts of carbon makes the base iron metal much harder and easier to cast.

Large quantity is correct because alloys are built upon a primary metal base that forms the bulk volume of the final material.

Base metal or main metal is correct because it serves as the underlying structural host material for the alloy.

Alloying agents is correct because these added metals or non-metals serve to modify the physical traits of the base metal.

Stronger and harder is correct because the mixture of different atomic sizes disrupts the sliding of metal layers, adding structural strength.

Mostly soft is correct because pure metals have neat, uniform rows of atoms that can easily slide past each other under stress.

More resistant is correct because alloys are specially engineered to withstand oxidation and chemical breakdown better than pure elements.

Lower is correct because the presence of foreign alloying atoms scatters and hinders the free flow of conducting electrons.

Both (A) and (B) is correct because alloys provide the tailored strength and corrosion resistance needed for making planes, surgical tools, jewelry, and pots.

An alloy is correct because brass is a solid solution made by combining two metallic elements together.

Copper and zinc is correct because combining these two metals produces the durable, gold-colored alloy known as brass.

All of the above is correct because brass is highly valued for making musical instruments, lock sets, and decorative door fixtures due to its durability and low friction.

Copper and tin is correct because bronze is historically and chemically defined as a highly durable copper-tin alloy.

Iron and carbon is correct because cast iron is a tough alloy consisting of iron with a specific percentage of carbon.

Mixtures is correct because air, foods, and clothes are composed of different chemical substances blended together physically.

Both (A) and (B) is correct because milk contains suspended fats and dissolved proteins and minerals within liquid water.

Both (A) and (B) is correct because concrete is manufactured by combining cement, water, sand, and gravels together.

Coffee beans and water is correct because dissolved coffee bean compounds distribute evenly throughout the water.

Milk and black coffee is correct because adding milk to black coffee creates this blended drink.

Acetic acid and water is correct because vinegar is a diluted acid solution where acetic acid molecules are dissolved in water.

Hydrocarbons is correct because LPG consists of propane and butane, which are organic hydrocarbon gases.

Iron and carbon is correct because stainless steel is a modified steel alloy made of iron and carbon.

All of the above is correct because stainless steel's rust resistance and strength make it perfect for sinks, pots, and surgical tools.

Mixture is correct because the gases in the air are physically blended rather than being chemically bonded to one another.

Smoke and dust particles is correct because air suspends small solid soot particles and dust alongside its gases.

Not chemically combined is correct because air is a physical mixture where gases exist independently.

Physical methods is correct because mixtures can be separated by cooling, condensation, or filtration.

78 % is correct because Nitrogen is the single most abundant gas in Earth's surrounding air.

Not combining easily with them is correct because nitrogen is relatively inert and does not readily react under normal conditions.

Oxygen concentration is very low on mountains is correct because atmospheric pressure and oxygen density decrease significantly at high altitudes.

Global warming and breathing issues is correct because CO2 is a greenhouse gas that traps solar heat and hinders safe respiration.

By hand (handpicking) is correct because fruit pieces are large and distinct, allowing them to be easily seen, picked, and sorted.

No, it is not practical is correct because the tiny sizes of sand and grain particles make hand-sorting extremely difficult and inefficient.

They are the same as before is correct because no chemical reactions occurred during mixing or separation to alter their molecules.

All of the above is correct because hand sorting, sieving, filtration, evaporation, distillation, and chromatography are all valid physical separation techniques.

Separation of different substances by hand is correct because hand sorting relies on manually picking apart large, visible items.

By hand sorting (picking by hand) is correct because color is a visible physical trait that makes manual sorting of items simple and fast.

Sieve is correct because a sieve has mesh pores that allow fine sand to pass while trapping larger pebbles.

Due to the large quantity is correct because sorting millions of small particles manually takes too much time and effort.

They fall through the sieve is correct because the small size of the particles allows them to easily pass through the sieve's open mesh.

They stay in the sieve is correct because their larger physical dimensions prevent them from passing through the small mesh pores.

Particle sizes is correct because sieving relies entirely on size differences to block larger items while letting smaller ones pass through the mesh.

A mixture of two solids is correct because winnowing separates solid chaff from solid grain.

Wind (moving air) is correct because blowing air carries away the lighter particles while the heavier ones fall straight down.

Chaff from grain is correct because blowing wind easily sweeps away the light dry chaff, leaving the heavier grain seeds behind.

Filtration is correct because it passes a fluid mixture through a barrier to trap suspended solid particles while letting the liquid through.

Filtration is correct because the solid sand grains remain suspended in the liquid and can easily be trapped by a filter.

Filter paper is correct because this semi-permeable paper barrier is engineered to separate fine solids from liquids.

Tiny pores is correct because microscopic openings in the paper allow liquid molecules to pass while blocking larger solid grains.

They are too large for the pores is correct because the physical dimensions of sand grains are larger than the microscopic pores of the paper.

Residue is correct because it is the scientific term used for the solid substance that is too large to pass through the filter medium.

Filtrate is correct because it is the clear, filtered liquid collected after successfully passing through the pores of the filter paper.

To filter out smoke and gases is correct because masks act as a physical filtration barrier to keep toxic soot particles and ash out of their lungs.

By evaporating the liquid is correct because evaporating the salt solution leaves a white solid residue, while pure water leaves nothing behind.

No, it cannot is correct because dissolved salt particles are too small to be trapped by the pores of filter paper.

Evaporation is correct because heating converts the liquid solvent into gas, isolating the dissolved solid.

Solid salt is correct because salt has a very high boiling point and does not vaporize along with the water molecules.

Decantation is correct because it involves gently pouring off the clear liquid from a settled solid residue without disturbing it.

Settle down at the bottom is correct because gravity must pull the heavy solid particles to the bottom of the container to allow clean separation.

The solid-free part is correct because decantation aims to isolate and collect the clear, sediment-free liquid.

By cooling is correct because lowering the temperature of water vapor molecules forces them to condense back into liquid water.

Distillation is correct because it uses heat to vaporize the liquid and then cools the vapor back into a pure liquid state in a separate container.

Impurities (like salt) is correct because only the liquid water evaporates at boiling point, leaving the solid salts dissolved in the flask.

Cooling tube is correct because passing vapor through a cooled condenser tube forces instant heat loss and condensation.

Clear water is correct because condensation returns the purified gaseous water back into its liquid state.

Distillate is correct because it is the scientific name for the purified liquid collected after condensation during distillation.

Chromatography is correct because it is a laboratory technique used to separate chemical mixtures based on how they distribute between different phases.

Filter paper is correct because the capillary action of paper pores allows dissolved solvents and solutes to travel upward at different speeds.

Different dyes is correct because colored inks are formulated by physically blending several soluble color pigments together.

Water and alcohol is correct because these polar liquids can easily dissolve and transport dye molecules up the paper.

They move up with different rates is correct because different molecular sizes and solubilities cause dye molecules to travel up the paper at unique speeds.

Chromatogram is correct because it is the term used for the physical pattern or visual record of separated chemicals on chromatography paper.

Solvent is correct because it acts as the dissolving medium that disperses solute molecules evenly in a solution.

Solute is correct because it represents the substance that is dispersed and dissolved throughout a solvent.

Solution is correct because it represents the uniform liquid phase where solute particles are completely dissolved in the solvent.

It can dissolve a wide range of solutes is correct because water polar molecules can dissolve more substances than any other liquid on Earth.

Both (A) and (B) is correct because tea, coffee, and soup are liquid solutions where various solutes are dissolved in water.

Water molecules can bind with other substances' molecules is correct because water polar molecules have positive and negative ends that attract other atoms.

From rocks they flow through is correct because flowing water slowly dissolves soluble minerals present in rocky riverbeds.

Suspension is correct because it is a heterogeneous mixture containing relatively large solid particles that remain physically separate from the fluid.

They settle down at the bottom is correct because gravity pulls the relatively large, insoluble solid particles down when the mixture is left still.

Chalk and water is correct because chalk particles do not dissolve, creating a cloudy, separate layer that eventually settles.

Particles are too small to be seen is correct because dissolved solute molecules separate completely, becoming invisible to the naked eye.

Empty spaces is correct because liquid and solute particles do not pack perfectly tight, leaving tiny molecular gaps.

Liquid particles fill the spaces of solid particles and form a link is correct because the different molecules interlock evenly to create a uniform phase.

Solubility is correct because it measures the maximum capacity of a solute to dissolve in a solvent under specific thermal conditions.

Dilute solution is correct because it describes a weak mixture that has a low ratio of solute compared to the solvent volume.

Concentrated solution is correct because it describes a strong mixture that has a high ratio of dissolved solute relative to the solvent.

Two or more substances not chemically combined is correct because mixtures are physically blended, allowing ingredients to stay chemically independent.

They keep their individual properties is correct because physical blending does not alter the molecular structure of the mixed ingredients.

A mixture of different gases is correct because air physically blends nitrogen, oxygen, carbon dioxide, and other gases without chemical bonds.

Physical methods is correct because physical techniques like evaporation, distillation, filtration, and chromatography separate components without chemical alteration.

Solution is correct because it represents a single-phase, uniform mixture where solutes are dissolved completely throughout a solvent.

Low amount is correct because a dilute solution contains very little dissolved solute relative to the volume of the solvent.

High amount is correct because a concentrated solution contains a large proportion of dissolved solute relative to the solvent.

Solubility is correct because it defines the dissolution limit of a solute in a specific solvent volume under set temperatures.

Mixture is correct because sugar and water combine physically without undergoing any chemical reaction to form new substances.

Distillation is correct because oil refining separates different hydrocarbons based on their boiling points using heating and cooling.

Iron is correct because it is a pure elemental transition metal, not a physical mixture of different metals.

78 % is correct because Nitrogen is the single most abundant gas present in the Earth's atmosphere.

Solubility is correct because it defines the limit of dissolution of a chemical substance under specific temperature conditions.

Substances can be separated by physical methods is correct because mixtures are physical blends without any chemical bonds holding their ingredients together.

Residue is correct because it is the scientific term used for the solid material trapped on the filter medium during separation.

No chemical combination is correct because the gases in the air are only physically mixed and can be separated easily without breaking bonds.

Heterogeneous mixture is correct because the grains and sugar particles do not mix uniformly and remain easily visible as separate parts.

Solute is correct because the soup powder is the solid substance being dissolved in the liquid medium (solvent).