physicscatalyst.com logo






Class 9 Science CBSE Multiple Choice questions for Is Matter around us pure





Given below are the Class 9 Science CBSE Multiple Choice questions for Is Matter around us pure
Hope you like them and do not forget to like , social share and comment at the end of the page.

Question 1. Air is regarded as a mixture because:
a)Its pressure may very
b)Its temperature may change
c)Its volume changes under different conditions
d)Its composition may vary

Question 2 .Which of the following is a compound?
a)Stainless steel
b)Bronze
c)Graphite
d)Hydrogen sulphide

Question 3..The process used to separate oil and water is:
a)Distillation
b)Sublimation
c)Separating funel
d)chromatography

Question 4.In which of the following the constituents are present in any ratio?
a)Mixture
b)Compound
c)Solution
d)Colloid

Question 5.A mixture of common salt, sulphur, sand and iron filings is shaken with carbon disulphide and filtered through a filter paper. The filtrate is evaporated to dryness in a china dish. What will be left in the dish after evaporation?
a)Sand
b)Sulphur
c)Iron filings
d)Common salt

Question 6. Two substances A and B when bought together form a substance C with the evolution of heat. The properties of C are entirely different from those of A and B. the substance C is:
a)A compound
b)An element
c)A mixture
d)None of the above

Question 7.Camphor can be purified by:
a)Distillation
b)Filtration
c)Sedimentation
d)Sublimation

Question 8.Which one of the following will result in the formation of a mixture?
a)Crushing of a marble tile into small particles
b)Breaking of ice cubes into small pieces
c)Adding sodium metal to water
d)Adding milk in water

Question 9.Purity of a solid substance can be checked by its:
a)Boiling point
b)Melting point
c)Solubility in water
d)Solubility in alcohol

Question 10.A mixture of ethanol and water ca be separated by:
a)Filtration
b)Decantation
c)Fractional distillation
d)Sublimation

Question 11.Salt can be obtained from sea water by:
a)Filtration
b)Decantation
c)Evaporation
d)Sublimation

Question 12.A sample contains two substances and has uniform properties. The sample is:
a)A compound
b)A heterogeneous mixture
c)An element
d)A homogeeous mixture

Question 13.A mixture of ZnCl2 and PbCl2 can be separated by:
a)Distillation
b)Crystallization
c)Sublimation
d)Adding acetic acid

Question 14.A mixture of methyl alcohol and acetoe can be separated by:
a)Distillation
b)Fractional distillation
c)Steam distillation
d)Distillation under reduced pressure

Question 15.Mixture of sand and sulphur may best be separated by:
a)Fractional crystallization from aqueous solution
b)Magnetic method
c)Fractional distillation
d)Dissolving in CS2 and filtering

Question 16.Which component of the mixture ( Fe + S ) reacts with dil. HCI and gives hydrogen gas?
a)Sulphur
b)Iron
c)Both
d)None

Question 17.Which of the following is considered to be a pure substance?
a)Granite
b)Sodium chloride
c)Muddy water
d)Milk of magnesia

Question 18.Physical properties of a mixture:
a)Vary with the amount of substance
b)Depend on the volume of the substance
c)Depend on the organization of the substance
d)Vary depending upon its components

Question 19.Compounds:
a)Are the same as mixtures?
b)Can be separated by their physical properties
c)Contain only type of element
d)Are different kinds of atoms chemically combined with each other?

Question 20.White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?
a)They are homogeneous mixtures and be classified as metallic alloys.
b)The materials are heterogeneous mixtures and can be classified by their components.
c)The samples have variable compositions and are classified as metallic solutions.
d)The samples are heterogeneous mixtures that can be separated using magnetic properties.



Question 21.To prepare iron sulphide, by heating a mixture of iron filings and sulphur powder, we should use a:
a)Copper dish
b)Watch glass
c)China dish
d)Petri dish

Question 22.Which of the following is an example of a heterogeneous substance?
a)Bottled water
b)Table salt
c)Pieces of copper
d)Candle

Question 23.Which of the following is an example of a homogeneous substance?
a)Granite
b)Copper sulphate
c)M& M candy
d)Muddy water

Question 24.Which flow chart correctly describes a homogeneous material?
a)Unknown - density - 3 layers
b)Unknown – filtration – two substances
c)Unknown – magnet – two substances
d)Unknown – boiling – one temperature

Question 25.A student is given a mixture of iron filings and sulphur in thee ratio 1 : 2 by weight. He was then asked to heat the mixture over a flame and to observe the olor change. The student will observe that the mixture becomes:
a)Black
b)Grey
c)Yellow
d)Orange

Question 26.Filtration can be used to separate:
a)Solids from solids
b)Liquids from solids
c)Liquids from liquids
d)Liquids from gases

Question 27.One common method used to separate dyes is:
a)Filtration
b)Distillation
c)Chromatography
d)Conductivity

Question 28.Melting points can separate materials because:
a)Substances melt at different temperatures
b)Molecules vibrate rapidly when heated
c)Heat causes molecules to disintegrate
d)May substances fuse at the melting point

Question 29.Distillation is a good separation technique for:
a)Solids
b)Liquids
c)Solid alloys
d)Gases

Question 30.Solubility is a good separation technique for:
a)Pure metals
b)Noble gases
c)Different salts
d)Metallic alloys

Question 31.Magnetism is most beneficial for separating:
a)Gases and non- metallic liquids
b)Magnetic solids and solids such as sulfur
c)Non- metallic solids and solids such as sulfur
d)Non- magnetic solids from non- magnetic liquids

Question 32.Before the heating when iron filing mixed with sulphur. Is this reaction will show chemical change:
a)Yes
b)No
c)Initially physical then chemical change
d)Initially chemical then physical change

 







Class 9 Maths Class 9 Science