Multiple Choice Questions

IS MATTER AROUND US PURE?

Updated for CBSE 2027
112+ Practice Questions
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Practice Questions with Answers

Total 112 questions available

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Q. 1
Identify a homogeneous mixture from the following:
A
Dust storm
B
A suspension of chalk in water
C
Soap bubbles formed by blowing air into soap solution
D
A dilute solution of alcohol in water
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Q. 2
At room temperature, a non-metal which is liquid is:
A
Fluorine
B
Sulphur
C
Bromine
D
Oxygen
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Q. 3
The properties of mixture are _________ from its components.
A
Slightly different
B
Entirely different
C
Similar
D
Average
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Q. 4
State whether the following statement is True or False: Particles of matter are always at rest and never move.
A
False
B
True
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Q. 5
How will you separate alcohol from water?
A
By Centrifugation
B
By fractional distillation
C
By separating funnel
D
By sublimation
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Q. 6
What phenomenon is responsible for the scattering of light by colloidal particles in a solution?
A
Dispersion effect
B
Tyndall effect
C
Diffraction effect
D
Refraction effect
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Q. 7
Cod-liver oil is an example of:
A
True solution
B
Colloidal solution
C
Suspension
D
Emulsion
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Q. 8
A Substance can be beaten into sheets and wires. What will you call it?
A
It is both brittle and lustrous
B
It is both sonorous and ductile
C
It is both malleable and ductile
D
It is both malleable and brittle
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Q. 9
What is concentration in a solution?
A
Amount of solvent
B
Total volume
C
Amount of solute
D
Amount of gas
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Q. 10
Which property is NOT a characteristic of a solution?
A
Homogeneous mixture
B
Particles do not settle down
C
Particles cannot be separated by filtration
D
Particles scatter light
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Q. 11
Which element is liquid at room temperature?
A
Iron
B
Gold
C
Mercury
D
Silver
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Q. 12
How is the concentration of a solution commonly expressed?
A
Only in grams
B
Only in liters
C
In milliliters
D
In percentages
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Q. 13
The smell of hydrogen sulfide (H2S) gas:
A
Pleasant
B
Of rotten egg
C
Of burning sulfur
D
None of these
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Q. 14
Which of the following is a colloid?
A
Aluminium paint
B
Blood
C
Milk
D
All
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Q. 15
All living creatures need to ____ for survival.
A
run
B
sleep
C
swim
D
breathe
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Q. 16
How many naturally occurring elements are there?
A
102
B
82
C
92
D
112
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Q. 17
Which of the following is a colloidal solution?
A
Starch solution
B
Copper sulphate solution
C
Kerosene oil and water
D
Chalk powder in water
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Q. 18
Diamond is lustrous because:
A
It is pure
B
It is colorless
C
It is hard
D
Its refractive index is high
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Q. 19
Thermometer is an instrument that measures:
A
Flow energy in a substance
B
Radiation of substance
C
Heat of substance
D
Temperature of substance
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Q. 20
The particles of colloidal solution can be separated by
A
Distillation
B
Centrifugation
C
Filtration
D
Evaporation
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Q. 21
Which of the following statements is true?
A
Homogeneous mixtures can have variable composition
B
Salt solution is heterogeneous mixture
C
Homogeneous mixtures fixed composition
D
Heterogeneous mixtures have fixed composition
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Q. 22
Which of the following is an example of a liquid solution?
A
Soda water
B
Sand and salt
C
Ice
D
Air
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Q. 23
What property do metals typically possess?
A
Dullness
B
Poor conductivity
C
Malleability
D
Fragility
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Q. 24
Which of the following statement is true about compounds?
A
Compound is heterogeneous and has fixed composition
B
Compound is heterogeneous and has no fixed composition
C
Compound is homogeneous and has fixed composition
D
Compound is heterogeneous
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Q. 25
Which of the following is an example of a non-metal?
A
Oxygen
B
Sodium
C
Iron
D
Copper
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Q. 26
What is an unsaturated solution?
A
Has no solute
B
Has more solute than saturated
C
Has maximum solute
D
Has less solute than saturation
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Q. 27
What is a solution?
A
A mixture of different solids
B
A gas only
C
A solid mixture
D
A homogeneous mixture
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Q. 28
Which of the following is not true for a mixture?
A
Energy is not given out in the preparation of a mixture
B
A mixture has a fixed melting point
C
The composition of a mixture is variable
D
A mixture can be separated into its constituents
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Q. 29
Which of the following is not a compound?
A
Sulphuric acid
B
Lead
C
Sulphur dioxide
D
Chalk
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Q. 30
What state of matter do particles in steam have at 373 K?
A
Liquid
B
Gas
C
Solid
D
Plasma
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Q. 31
What makes clothes dry faster on a windy day?
A
More sunlight
B
Strong wind
C
Thick clouds
D
Heavy rain
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Q. 32
The cause of Brownian movement is
A
Attractive forces
B
Convection current
C
Heat changes in liquid state
D
Impact of molecules of dispersion medium
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Q. 33
Which of the following is a physical change?
A
Burning of natural gas
B
Rusting of iron
C
Freezing of water
D
Digestion of food
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Q. 34
What is a solid solution called?
A
A suspension
B
An alloy
C
A colloid
D
A solution
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Q. 35
What is the temperature at which a solid melts to become a liquid called?
A
Freezing point
B
Melting point
C
Evaporation point
D
Boiling point
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Q. 36
Which of the following is not a pure substance?
A
Nitric acid
B
Mercury
C
Tap water
D
Distilled water
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Q. 37
What do we call a mixture that has the same look and texture all through it?
A
A weird mixture
B
A special mixture
C
A homogeneous mixture
D
A different mixture
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Q. 38
What are the two main components of a solution?
A
Liquid and solid
B
Solid and gas
C
Solvent and solute
D
Gas and liquid
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Q. 39
The element which is a liquid slightly above 300°C is:
A
Cesium
B
Sodium
C
Magnesium
D
Lithium
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Q. 40
Which of the following is not a pure substance?
A
Sugar
B
Salt
C
Mercury
D
Blood
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Q. 41
Clouds and fogs are an example of
A
Gas in liquid solution
B
Gas in solid solution
C
Gas in gas solution
D
Liquid in gas solution
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Q. 42
Find the incorrect statement:
A
No energy changes occur when the constituents of air try to be mixed.
B
Purity of compounds can be tested by determining their melting points.
C
Cesium and gallium are liquids above 300°C.
D
Mixture can be called a single substance.
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Q. 43
How is solubility defined?
A
Maximum solute in solution
B
Concentration of the solvent
C
Amount of solvent
D
Total solution volume
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Q. 44
A hard substance when bent produces a tinkling sound. Predict its nature.
A
Non-metal
B
Metal
C
Compound
D
All of these
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Q. 45
The process of separation of insoluble solids from a liquid is called:
A
Filtration
B
Decantation
C
Crystallisation
D
Evaporation
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Q. 46
What property of matter allows the smell of hot cooked food to reach us quickly?
A
High rigidity
B
Fast diffusion
C
Low density
D
High compressibility
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Q. 47
A combination of common salt and iron filings is a:
A
Mixture
B
Elements
C
Compound
D
Both A and B
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Q. 48
What happens to the temperature of a substance during the melting process?
A
It remains constant
B
It increases continuously
C
It fluctuates unpredictably
D
It decreases continuously
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Q. 49
State whether the following statement is True or False: Evaporation happens faster with an increase in wind speed.
A
True
B
False
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Q. 50
What does the activity with potassium permanganate and water show us about matter?
A
That matter can change color easily
B
That there are many tiny particles in matter
C
That matter can disappear completely
D
That matter is always solid
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Q. 51
When iron and sulphur are heated at high temperature
A
Yellow coloured iron sulphide
B
Black coloured FeS is formed
C
They do not heat
D
Mixture of iron and sulphur
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Q. 52
Which of the following substances is a compound?
A
Water
B
Helium
C
Iron
D
Oxygen
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Q. 53
Which of the following has the highest solubility at 293 K?
A
NaCl
B
KNO3
C
NH4Cl
D
KCl
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Q. 54
Which one is a physical change?
A
Mixing BaSO4 + NaCl
B
Adding NaCl to water
C
Burning magnesium in air
D
Mixing NH3 and HCl
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Q. 55
What is the name given to the liquid which contains suspended particles?
A
Collided solution
B
Suspension
C
True solution
D
All of these
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Q. 56
Nanometer is an:
A
Unit for measuring micro-distance
B
Instrument used for measuring micro-distance
C
Unit for measuring macro-distance
D
Instrument used for measuring macro-distance
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Q. 57
Which of the following has the smell of rotten egg?
A
Copper Sulphide
B
Hydrogen Sulphide
C
Calcium Sulphide
D
Iron Sulphide
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Q. 58
Which gas is the main component of air?
A
Carbon dioxide
B
Nitrogen
C
Helium
D
Oxygen
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Q. 59
Which of the following statements is uncommon for both elements and compounds?
A
They are homogeneous
B
They are commonly found free in nature
C
They are the simplest form of matter
D
They can be broken down into simpler substances
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Q. 60
Which method measures concentration as mass by mass percentage?
A
Mass of solute divided by mass
B
Volume of solute divided by mass
C
Mass of solution divided by volume
D
Mass of solute divided by volume
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Q. 61
What is the effect of temperature on solubility?
A
It remains the same
B
It can increase or decrease
C
It only affects liquids
D
It only affects solids
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Q. 62
Which of the following statement is always true when a substance undergoes physical change
A
A new substance is formed
B
It changes colour
C
Its composition remains the same
D
It boils
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Q. 63
A shining thick liquid is often used in glass thermometers. Name it.
A
Bromine
B
Mercury
C
Gallium
D
Calcium
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Q. 64
How small are the particles in a solution?
A
Larger than 1 mm
B
Smaller than 1 nanometer
C
Between 1 mm and 1 cm
D
Exactly 1 meter
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Q. 65
The size of particles of true solutions is
A
> 1000 nm
B
< 1 nm
C
> 100 nm
D
Between 1 nm to 100 nm
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Q. 66
The particles of suspension
A
Can’t be seen with naked eye
B
Can be seen with naked eye
C
Can’t be seen with powerful microscope
D
Can’t be seen with electron microscope
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Q. 67
Which of the following is heterogeneous?
A
Air
B
Smoke
C
Stainless steel
D
Brass
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Q. 68
What is solubility?
A
Solid state
B
Maximum solute in a solvent
C
Ability to evaporate
D
Amount of solute
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Q. 69
Which of the following are chemical changes?
A
Melting of ice
B
Freezing of water
C
Drying of wet clothes in sunlight
D
Cooking of vegetables
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Q. 70
State whether the following statement is True or False: Matter is made up of particles that keep dividing into smaller particles.
A
False
B
True
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Q. 71
State whether the following statement is True or False: On increasing the temperature of solids, the particles start vibrating with greater speed.
A
False
B
True
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Q. 72
Which one is NOT an element?
A
Metals
B
Non-metals
C
Alloys
D
Semi-metals
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Q. 73
A compound is a _______ substance made up of _______.
A
impure; two or more simpler substances
B
hard; only one element
C
pure; two or more elements
D
soft; only one kind of atoms
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Q. 74
Which of the following can be separated by filtration?
A
Solution
B
Suspension
C
Colloid
D
All of the above
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Q. 75
When a beam of light passes through a colloidal solution, it gets.
A
Absorbed
B
Scattered
C
Reflected
D
Retracted
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Q. 76
Air shows the property of:
A
N2
B
O2
C
Both N2 and O2
D
None of these
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Q. 77
Kerosene oil and water can be separated by
A
Distillation
B
Centrifugation
C
Separating funnel
D
Evaporation
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Q. 78
What is the main characteristic of liquids?
A
They can change their shape
B
They have a definite shape
C
They are always rigid
D
They don't have a fixed volume
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Q. 79
Statement A: Brass is a solution while gun powder is not. Statement B: Air represents a solution in terms of science. Which of the two statements is true?
A
Statement B
B
Statement A
C
Both A and B
D
Neither A nor B
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Q. 80
What is a physical change?
A
Change in composition
B
Change in appearance
C
Change in state
D
All of the above
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Q. 81
40 g of common salt is dissolved in 320 g of water. The mass percentage of salt is
A
10%
B
15%
C
11.1%
D
12.5%
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Q. 82
What happens when you pour acetone on your palm?
A
evaporate
B
freeze
C
solidify
D
disappear
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Q. 83
State whether the following statement is True or False: All solids have a definite shape, distinct boundaries, and fixed volumes, making them easy to compress.
A
True
B
False
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Q. 84
How does the rate of diffusion of gases compare to that of liquids and solids?
A
Gases diffuse slower than liquids and solids
B
Gases diffuse faster than liquids and slower than solids
C
Gases diffuse faster than both liquids and solids
D
Gases and liquids diffuse at the same rate
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Q. 85
1 carat of diamond is equal to:
A
95% mg
B
91% gold
C
100 g
D
200 mg
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Q. 86
What are metalloids?
A
Poor conductors
B
Elements with metallic properties
C
Gaseous elements
D
Elements with no properties
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Q. 87
What is a characteristic of a colloidal solution?
A
Settles upon standing
B
Completely transparent
C
Scatters light
D
Visible particles
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Q. 88
In a pure substance, all the constituent particles are the same in their ____ nature.
A
Biological
B
Physical
C
Structural
D
Chemical
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Q. 89
What does the solvent do in a solution?
A
Settles at the bottom
B
Adds flavor
C
Changes color
D
Dissolves the solute
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Q. 90
What is a dilute solution?
A
No solute
B
High amount of solute
C
Low amount of solute
D
Equal amounts of solute and solvent
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Q. 91
What does a concentrated solution contain?
A
Little solute
B
Large amount of solute
C
Equal parts solute and solvent
D
No solute
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Q. 92
What is a chemical change?
A
Change in appearance
B
Physical change
C
No change
D
Change in composition
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Q. 93
The process of change of a solid state into a liquid state is known as _____.
A
Deposition
B
Vaporization
C
Fusion
D
Sublimation
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Q. 94
Which out of the following is a heterogeneous mixture?
A
Iodised table salt
B
Brass
C
Steel
D
Air
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Q. 95
What happens in a saturated solution?
A
Solute evaporates
B
Solvent evaporates
C
No more solute can dissolve
D
More solute can dissolve
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Q. 96
A solution is a ______ mixture of two or more substances.
A
Opaque
B
Homogeneous
C
Transparent
D
Heterogeneous
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Q. 97
What is the primary reason for ice floating on water?
A
Ice dissolves slowly in water
B
Ice is a liquid at room temperature
C
Ice has a lower density than water
D
Ice has a higher density than water
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Q. 98
Which of the following is not a mixture?
A
Blood
B
Soap solution
C
Coal
D
Carbon dioxide
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Q. 99
Kinetic energy of molecules is directly proportional to
A
Temperature
B
Pressure
C
Both (a) and (b)
D
Atmospheric pressure
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Q. 100
Which of the following is an example of a solid in a liquid colloid?
A
Shaving cream
B
Smoke
C
Milk of magnesia
D
Fog
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Q. 101
State whether the following statement is True or False: A suspension is a mixture where solute particles dissolve completely in the liquid.
A
True
B
False
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Q. 102
Which of the following is a liquid metal?
A
Copper
B
Mercury
C
Silver
D
Bromine
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Q. 103
What do we call the change of state directly from solid to gas?
A
Sublimation
B
Freezing
C
Melting
D
Evaporation
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Q. 104
Particles of matter have ____ between them.
A
space
B
fire
C
air
D
water
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Q. 105
What type of solution is lemonade?
A
Gas in gas
B
Liquid in liquid
C
Gas in liquid
D
Solid in liquid
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Q. 106
Why don’t solutions scatter light?
A
Particles are too large
B
Particles are too small
C
Solutions absorb light
D
Solutions reflect light
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Q. 107
Which of the following is an example of a saturated solution?
A
Saltwater with undissolved salt
B
Saltwater with no visible salt
C
Sugar water with no sugar
D
Clear water
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Q. 108
4 g of solute are dissolved in 36 g of water. What is the mass percent of the solution?
A
100%
B
10%
C
5%
D
20%
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Q. 109
What happens to the particles in a solution over time?
A
They evaporate
B
They mix evenly
C
They freeze
D
They settle
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Q. 110
Everything in this universe is made up of material which scientists have named _____.
A
Air
B
Elements
C
Matter
D
Energy
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Q. 111
What is the percentage of fat present in milk of full cream?
A
6.0 %
B
1.5 %
C
3.0 %
D
4.0 %
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Q. 112
What keeps the particles of matter together?
A
Gravity
B
Force of attraction
C
Electricity
D
Water
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