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- 1. Multiple Choice
What is Winnowing ?
A method used to separate the components of a mixture which are different sizes.substances.
The practice of separating undesirable solid substances and impurities from useful solids by hand.
A method used to separate lighter components of a mixture from the heavier ones by wind or by blowing air.
- 2. Multiple Choice
During _________________ the solid particles that settle down forming a layer are called sediments
Decantation
Condensation
Evaporation
sieving
Sedimentation
- 3. Multiple Choice
the process of converting a liquid form to its vapour form is
Decantation
Condensation
Sedimentation
Evaporation
- 4. Multiple Choice
How are grain seeds removed from their stalks?
Sieving
Winnowing
Threshing
All of the above
- 5. Multiple Choice
What is a mixture?
A chemical combination of two or more different substances.
A physical combination of two or more different substances.
A chemically pure substance.
A special type of solution
- 6. Multiple Choice
When the solute dissolves into a solvent and disappears it is called a _____________.
MIxture
Solution
Solvent
None of the above
- 7. Multiple Choice
Pure substances are made up of the same kind of atoms.
True
False
- 8. Multiple Choice
Lemonade is a special mixture called a
substance
solution
plasma
ingredient
- 9. Multiple Choice
A fruit salad is a
solution
mixture
- 10. Multiple Choice
Which of the following is essential to perform winnowing activity?
Wind
Water
Magnet
Filter paper
- 11. Multiple Choice
While preparing chapatis, Nitya 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
- 12. Multiple Choice
Hand picking method is effective in
solid mixture
Liquid mixture
Gaseous mixture
None of these
- 13. Multiple Choice
The diagram shows the apparatus for separating soil and water. What are the labelled parts?A = distillate, B = filtrateA = filtrate, B = residueA = residue, B = filtrateA = residue, B = distillate - 14. Multiple Choice
What separation technique does the picture show?
Sieving
filtering
magnetic separation
Distillation
- 15. Multiple Choice
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
- 16. Multiple Choice
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
- 17. Multiple ChoiceWhich technique is shown the diagram belowseivingfiltrationdecantingcrystallization
- 18. Multiple Choice
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
- 19. Multiple Choice
The process of changing solid to gas directly is ______
Evaporation
Condensation
Melting
Sublimation
- 20. Multiple Choice
The method that is used to obtain pure salt from impure salt is
Decantation
Crystallisation
Evaporation
Condensation
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