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CLASS -9

Total questions: 89

Worksheet time: 45mins

Name
Class
Date
1.

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as

a)

(a) Composition of solute

b)

(b) Concentration of a solvent

c)

(c) Concentration of a solute

d)

(d) Concentration of a solution

2.

Suspension is _______ mixture

a)

Homogeneous

b)

Saturated

c)

Unsaturated

d)

Heterogenous

3.

Cooking of food and digestion of food

a)

Are both physical processes

b)

Are both chemical processes

c)

Cooking is physical whereas digestion is chemical

d)

Cooking is a chemical whereas digetion is physical

4.

How will you seperate oxygen from a mixture of liquid air?

a)

Centrifugation

b)

Seperating funnel

c)

Fractional distillation

d)

Distillation

5.

Tyndall effect is observed in forests because of

a)

Trees

b)

High oxygen level

c)

Mist and dust particles in the air

d)

Less sunlight

6.

Air is regarded as mixture because?

a)

It's pressure may vary

b)

It's temperature may vary

c)

Volume changes under different compositions

d)

It's compositions may vary

7.

In which of the following constituents are present in the ratio?

a)

Mixture

b)

Solution

c)

Compound

d)

Colloid

8.

When a saturated solution is heated and more solute is dissolved in it, what is such a solution called?

a)

Supersaturated Solution

b)

Colloidal Solution

c)

Aqueous Solution

d)

Thermo Saturated Solution

9.

A sample contains two substances and has uniform properties. The

sample is

a)

A compound

b)

A heterogeneous mixture

c)

An element

d)

A homogeneous mixture

10.

Air is regarded as mixture because?

a)

It's pressure may vary.

b)

It's temperature may vary.

c)

Volume changes under different compositions.

d)

It's compositions may vary.

11.

In which of the following constituents are present in the fixed ratio?

a)

Mixture.

b)

Compound.

c)

Solution.

d)

Colloid.

12.

Brass is an example of?

a)

Homogeneous compound.

b)

Homogeneous mixture.

c)

Heterogeneous mixture.

d)

Heterogeneous compound.

13.

When two liquids do not mix, they form two separate layers and are known as

a)

(a) Miscible liquids

b)

(b) Immiscible liquids

c)

(c) Saturated liquids

d)

(d) Super saturated liquids

14.

brass is an alloy. It is a mixture of______

a)

30% Zinc 70% copper

b)

20% copper 80% nickel

c)

40% iron 80% copper

d)

35% gold 65% zinc

15.

What is an element?

a)

A pure substance that cannot be broken down.

b)

Two atoms bonded together.

c)

Two or more different types of atoms bonded together.

d)

An molecule with an unequal distribution of charge.

16.

What are atoms composed of?

a)

Protons and electrons.

b)

Protons, neutrons, and electrons.

c)

Neutrons and electrons.

d)

Ions, elements, and compounds.

17.

How many H atoms are in water?

a)

1

b)

2

c)

3

d)

4

18.

Blood and sea water are

a)

Blood is a mixture whereas sea water is a compound

b)

Blood is a compound and sea water is a mixture

c)

Both are mixtures

d)

Both are Compounds

19.

Define a pure substance?

a)

A pure substance consists of a single type of particles and constant composition.

b)

A pure substance consists of two different types of particles with variable composition

c)

A pure substance consists of many types of particles and different composition

20.

A sample contains two substances and has uniform properties. The sample is ________?

a)

A compound.

b)

A heterogeneous mixture.

c)

An element.

d)

A homogeneous mixture.

21.

Which of the following elements is not a metalloid?

a)

(a) Boron

b)

(b) Silicon

c)

(c) Germanium

d)

(d) Tungsten

22.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)
Homogenous
c)
Heterogenous
d)
Salty
23.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)
Homogenous
c)
Heterogenous
d)
Salty
24.
A mixture that is evenly distributed is called ...
a)
Heterozygous
b)
Heterogenous
c)
Homogenous
d)
Periodic
25.
Changing the phase, size or shape of something....
a)
Chemical change
b)
Physical Change
c)
Suspension
d)
Colloid
26.
If you change a substance into a new substance...
a)
Partial Change
b)
Physical Change
c)
Chemical Change
d)
Freezing
27.
Substance with atoms that are all alike.
a)
element
b)
compound
c)
homogeneous mixture
d)
heterogeneous mixture
28.

______________ is the homogenous mixture of 2 or more substances

a)

Colloid

b)

Tyndall Effect

c)

Solution

d)

Centrifugation

29.

Brass is an alloy of molten Copper in ___________ .

a)

solid Zinc

b)

molten Zinc

c)

gaseous Zinc

d)

molten Tin

30.

Air is regarded as a mixture because __________ .(two or more options might be correct)

a)

its pressure may vary

b)

its temperature may change

c)

its composition may vary

d)

its volume changes under different conditions

31.

If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of

a)

Evaporation

b)

Precipitation

c)

Condensation

d)

Sublimation

32.

Heterogeneous mixture in which the solute particles do not dissolve and remain suspended throughout the solvent and the solute particles can be seen with the naked eye is known as:

a)

Colloidal solution

b)

Super saturated solution

c)

Sublimation

d)

Suspensions

33.

The continuous zig-zag movement of colloidal particles in a dispersion medium is called

a)

Dispersion

b)

Tyndall effect

c)

Brownian movement

d)

Oscillation

34.

When two liquids do not mix, they form two separate layers and are known as

a)

Miscible liquids

b)

Immiscible liquids

c)

Saturated liquids

d)

Super saturated liquids

35.

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as

a)

Composition of solute

b)

Concentration of a solvent

c)

Concentration of a solute

d)

Concentration of a solution

36.

The process used to separate oil and water is:

a)

Distillation

b)

Sublimation

c)

Separating funel

d)

chromatography

37.

Purity of a solid substance can be checked by its:

a)

Boiling point

b)

Melting point

c)

Solubility in water

d)

Solubility in alcohol

38.

.One common method used to separate dyes is:

a)

Filtration

b)

Distillation

c)

Chromatography

d)

Evaporation

39.

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

40.

A sample contains two substances and has uniform properties. The sample is:

a)

A compound

b)

A heterogeneous mixture

c)

An element

d)

A homogenous mixture

41.

Name the mixture whose particles are large enough to scatter light:

a)

True solution

b)

Homogenous solution

c)

Colloid

d)

all of the above

42.

Which of the following property does not describe a compound:

a)

it is composed of two or more elements

b)

it is a pure substance

c)

constituents cannot be separated by physical means

d)

mixed in any proportion by mass

43.

Smell of Hydrogen sulfide gas

a)

rotten eggs

b)

burning tyre

c)

pleasant

d)

sweet

44.

(a)   is the non-metal which is in liquid state at room tempearture.

45.

Which of the following techniques is used in diagnostic lab for blood and urine test:

a)

Sublimation

b)

Crystallization

c)

Centrifugation

d)

Evaporation

46.

Which of the following is a chemical change?

a)

cooking food

b)

melting of wax

c)

dissolving sugar in water

d)

mixing iron fillings with sulfur powder

47.

The continuous zig-zag movement of colloidal particles in a dispersion medium is called:

a)

Oscillation

b)

Tyndall effect

c)

Dispersion

d)

Brownian movement

48.

The clear liquid which is left behind in the beaker after settling down of sediments is called:

a)

Solvent

b)

Filtrate

c)

Supernatant

d)

Solution

49.

A colloid with a solid dispersed phase and liquid dispersing medium is called (a)   .

50.

If a solution contains 60g of common salt in 340g water, the mass by mass percentage will be (a)   %.

51.

Which of the following is a true solution?

a)

Blood

b)

Milk

c)

Chalk powder in water

d)

Salt solution

52.

(a)   technique can be used to separate different components of chlorophyll.

53.

Boiling point of Nitrogen is ________ deg C.

a)

- 183

b)

-186

c)

-196

d)

-190

54.

We can separate crystals of alum from impure samples through (a)   method.

55.

(a)   is the mixture of two or more metals or a metal and a non-metal and cannot be separated into their components by physical methods.

56.

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as

a)

(a) Composition of solute

b)

(b) Concentration of a solvent

c)

(c) Concentration of a solute

d)

(d) Concentration of a solution

57.

Two chemical species X and Y combine together to form a product P which contains both X and Y
X + Y  →\rightarrow    P
X and Y cannot be broken down into simpler substances by simple chemical
reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compound
(iii) X and Y are elements
(iv) P has a fixed composition

a)

(a) (i), (ii) and (iii),

b)

(b) (i), (ii) and (iv)

c)

(c) (ii), (iii) and (iv)

d)

(d) (i), (iii) and (iv)

58.

The quantity of matter present in an object is called

a)

weight

b)

Gram

c)

mass

d)

density

59.

What is the solute in the soda water?

a)

Water

b)

Carbon dioxide

c)

Sugar

d)

Oxygen

60.

how will you seperate oxygen from a mixture of liquid air?

a)

centrifugation

b)

seperating funnel

c)

fractional distillation

d)

distillation

61.

a mixture of dye in a volatile liquid can be seperated by?

a)

evaporatoion

b)

sedimentation

c)

chromatography

d)

filtration

62.

Tyndall effect is observed in forests because of

a)

tress

b)

high oxygen level

c)

mist and dust particles in the air

d)

less sunlight

63.

Tyndall effect is observed in forests because of

a)

tress

b)

high oxygen level

c)

mist and dust particles in the air

d)

less sunlight

64.

concentration of 36g of NaCl in 100 g of water is

a)

23%

b)

26.47%

c)

29.32%

d)

21.11%

65.

. This is a type of heterogeneous mixture in which the particles are dispersed and do not settle out.

a)

alloy

b)

solution

c)

suspension

d)

colloid

66.

Particles size of solution

a)

Less than 1 nm

b)

More than 1 nm

c)

Between 1 and 1000 nm

d)

More than 1000 nm

67.

Which of the following apparatus is not required in sublimation?

a)

Condenser

b)

Funnel

c)

China Dish

d)

Wire gauze

68.

Suspension is _______ mixture

a)

Homogeneous

b)

Saturated

c)

Unsaturated

d)

Heterogenous

69.

Cooking of food and digestion of food

a)

Are both physical processes

b)

Are both chemical processes

c)

Cooking is physical whereas digestion is chemical

d)

Cooking is a chemical whereas digetion is physical

70.

Which of the following are homogeneous in nature?

(1) Ice (2) Wood (3) Soil (4) Air

a)

(1) and (3)

b)

(2) and (4)

c)

(1) and (4)

d)

(3) and (4)

71.

How will you seperate oxygen from a mixture of liquid air?

a)

Centrifugation

b)

Seperating funnel

c)

Fractional distillation

d)

Distillation

72.

Tyndall effect is observed in forests because of

a)

Trees

b)

High oxygen level

c)

Mist and dust particles in the air

d)

Less sunlight

73.

Air is regarded as mixture because?

a)

It's pressure may vary

b)

It's temperature may vary

c)

Volume changes under different compositions

d)

It's compositions may vary

74.

In which of the following constituents are present in the ratio?

a)

Mixture

b)

Solution

c)

Compound

d)

Colloid

75.

When a saturated solution is heated and more solute is dissolved in it, what is such a solution called?

a)

Supersaturated Solution

b)

Colloidal Solution

c)

Aqueous Solution

d)

Thermo Saturated Solution

76.

A sample contains two substances and has uniform properties. The

sample is

a)

A compound

b)

A heterogeneous mixture

c)

An element

d)

A homogeneous mixture

77.

what is the solute in the soda water?

a)

water

b)

carbon dioxide

c)

sugar

d)

oxygen

78.

colloids can be separated by

a)

filtration

b)

distillation

c)

sedimantation

d)

centrifugation

79.

what are atoms composed of?

a)

Protons and electrons

b)

Protons, neutrons and electrons

c)

neutrons and electrons

d)

ions, elements and compound

80.

how will you seperate the components of sugar solution?

a)

evaporation

b)

crystallization

c)

filteration

d)

chromatography

81.

burning of candle is a

a)

physical change

b)

chemical change

c)

both physical and chemical change

d)

none of these

82.

What is a compound?

a)

A homogeneous mixture of two or more metals.

b)

A pure substance that cannot be broken down into simpler substances.

c)

A mixture of two or more substances that can be separated by physical means.

d)

A substance made of two or more different elements chemically bonded together.

83.

Which of the following is a characteristic of a homogeneous mixture?

a)

It has a uniform composition throughout.

b)

It contains visibly different substances.

c)

It can be separated by filtration.

d)

It has a variable composition.

84.

Which of the following processes is used to separate a solid from a liquid in a heterogeneous mixture?

a)

Distillation

b)

Evaporation

c)

Chromatography

d)

Filtration

85.

What type of mixture has a uniform composition throughout?

a)

Suspension

b)

Colloid

c)

Homogeneous mixture

d)

Heterogeneous mixture

86.

Which of the following is an example of a physical change?

a)

Burning wood

b)

Cooking an egg

c)

Melting ice

d)

Rusting iron

87.

Which of the following is a characteristic of a colloidal solution?

a)

Particles are uniformly distributed and cannot be seen

b)

Particles are visible under a microscope

c)

Particles settle down when left undisturbed

d)

Particles can be filtered out using a filter paper

88.

Which of the following processes involves a chemical change?

a)

Breaking of glass

b)

Melting of ice

c)

Rusting of iron

d)

Boiling of water

89.

What type of mixture is formed when salt is dissolved in water?

a)

Heterogeneous mixture

b)

Homogeneous mixture

c)

Colloid

d)

Suspension

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