method of handpicking can be used if the impurity is __________________ enough to be picked out by hand
  • large
  • small
  • hot
  • cold
The process of settling down of particles of a solid in a liquid is
  • Sublimation
  • Sedimentation
  • Filtration
  • Decantation
While preparing chapatis, Priti 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
What separation technique does the picture show?
  • Sieving
  • filtering
  • magnetic separation
  • Distillation
The drops of water that appear on the outside of a glass of cold water on a warm day are an example of?
  • sublimation
  • condensation
  • evaporation
Iron and copper screws could be separated using a magnet because
  • iron is magnetic, copper is not
  • copper is magnetic, iron is not
  • neither metal is magnetic
  • copper screws are heavier than iron and fall off the magnet
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
The process of changing solid to gas directly is ______
  • Evaporation
  • Condensation
  • Melting
  • Sublimation
Statement A: A mixture of cement and pebbles can be separated by using the sieve with small pores Statement B: A sieve with small pores will allow only small cement particles to pass through and will hold back the pebbles
  • a. Statement A is true only
  • b. Statement B is true only
  • c. Both are false
  • d. Both are true
You might have observed the preparation butter from cream at home. Which method(s) can be used to separate butter from the residue?
  • evaporation
  • centrifugation
  • filtration
  • sedimentation and decantation
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
A ______________ mixture is one that does not have a uniform composition.
  • heterogeneous
  • homogenous
  • pure substance
A material that allows liquids to pass through it, while very small solids remain behind as residue
  • Filter
  • Sieve
  • Funnel
  • Spoon
Which of the following is a method of separating solutions?
  • hand seperation
  • filtering
  • screening
  • evaporation
Chocolate milk is an example of a
  • homogeneous mixture
  • heterogeneous mixture
Soil is an example of a
  • homogeneous mixture
  • heterogeneous mixture
A student collects seashells at the beach when they werre on a picnic. Teacher will not allow the student to take any sand on the bus. If the student wishes to take the seashells home he must separate the seashells from the sand. Which of the following would be most helpful when trying to separate the sand from the sea shells?
  • hot plate
  • water
  • sieve
  • magnet
A group of students in Eco club collected empty cans for recycling. They have several large bins with aluminum and steel cans, all mixed together. The two types of cans must be separated. Which of the following techniques could the students use to separate the two types of cans?
  • Place the cans in water, and the aluminum cans will float
  • Crush the cans to make them easier to carry
  • Test the cans for their ability to conduct electricity
  • Use a magnet to find and remove the steel cans
The separation technique that involves heating a solution until the liquid changes into a gaseous state, leaving behind a solid is known as
  • decanting
  • evaporation
  • loading
  • chromatography
Separation of common salt from the sea water is by ………………
  • sieving
  • evaporation
  • magnetic separation
  • winnowing
The method used to separate substances differing in colour, size and shape from a solid mixture ………………….
  • magnetic separation
  • decantation
  • handpicking
  • sieving
In a mixture, solids of different size can be separated by ……………..
  • magnetic separation
  • winnowing
  • sieving
  • evaporation
The method used to separate the seeds from the fruit juice is …………………
  • filtration
  • sieving
  • crystallization
  • winnowing
Husk is separated from heavier seeds of grain
  • a. winnowing
  • b. Hand picking
  • c. sieving
  • d. None of the above
Which of the following properties can affect dissolution of sugar in water?
  • a. Quantity of Sugar
  • b. Temperature
  • c. Type of water
  • d. Amount of sugar dissolved
Which technique is used to purify dirty water?
  • a. Centrifugation
  • b. Evaporation
  • c. Sedimentation
  • d. Decantation
Four mixtures are given below (i) Kidney beans and chick peas (ii) Pulses and rice (iii) Rice flakes and corn (iv) Potato wafers and biscuits Which of these can be separated by the method of winnowing?
  • (a) (i) and (ii)
  • (b) (ii) and (iii)
  • (c) (i) and (iii)
  • (d) (iii) and (iv)
A solution is said to be _______ if it cannot dissolve more of the substance in it.
  • a. Saturated
  • b. Unsaturated
  • c. Homogeneous
  • d. Hetrogenous
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