WorksheetsSeparation of substances (5th June,2020)
Total questions: 25
Worksheet time: 14mins
The process of settling down of particles of a solid in a liquid is
Sublimation
Sedimentation
Filtration
Decantation
The solubility ____________ with increase in temperature.
doesn't change
decreases
increases
While preparing chapatis, Paheli found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?
Threshing
Sieving
Winnowing
Filtration
What is the process that is used to separate grains from stalks called?
handpicking
threshing
sieving
winnowing
When is the solution saturated?
No more salt can be dissolved in the amount of water we have taken
Lot more salt can be added
You have to add some sugar into the solution
None of the above
Sawdust is not soluble in water. If, accidentally some particles of sawdust drop into a glass of water. How would you separate them from water?
Decanting
Filtering
Sieving
Distillation
You had these materials together but after performing a separation technique, you have these five groups. Which separation technique did you use?
Distillation
Decanting
Paper chromatography
Sieving
What is the purpose of Filtration?
Separating and insoluble solid from a liquid
Separation of a mixture of 2 solids
Separates heavier substances from a suspension
Which of the following is essential to perform winnowing activity?
Wind
Water
Magnet
Filter paper
what is the method of separating components from a mixture by blowing?
handpicking
threshing
winnowing
washing
The substance in the mixture to be separated out should be
Tightly bounded with mixture
Loosely bounded with mixture
having high density
None of these
The density of the husk is
less than grain
more than grain
equal to grain
sometimes less, sometimes more
Handpicking method depends on the ____________ of substances
Mass & Shape
Size & Shape
Purity & Size
State & Heat
Hand picking is done where the number of substances to be separated out is __________
More
Less
Does not depend
Extremely More
What is removed from wheat before grinding?
stones
husk
dust
option 1 and 2
all of the above
Handpicking method is preferred in ____________ mixture
Solid-Solid
Solid-Liquid
Liquid-Gas
Solid-Gas
Evaporation separates a mixture by
Moving a mixture over another as it stays still
Using heat to change a liquid to a gas
Using both evaporation and condensation
Separating chemicals from water and air
