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Class VI Term 1 Unit 3 Matter around us Textbook Solutions
3 Matter Around Us
Evaluation
I. Choose the correct answer.
1. ___________is not made of matter.
a. Gold ring
b. Iron nail
c. Light ray
d. Oil drop
Ans: c. Light ray
2. 200 ml of water is poured into a bowl of 400 ml capacity. The volume of water
will be
a. 400 ml
b. 600 ml
c. 200 ml
d. 800 ml
Ans: c. 200 ml
3. Seeds from water-melon can be removed by_______________ .
a. hand-picking
b. filtration
c. magnetic separation
d. Decantation
Ans: a. Hand-picking
4. Lighter impurities like dust when mixed with rice or pulses can be removed by _______________.
a. filtration
b. sedimentation
c. decantation
d. Winnowing
Ans: d. Winnowing
5. _______________ is essential to perform winnowing activity.
a. Rain
b. Soil
c. Water
d. Air
Ans: d. Air
6. Filtration method is effective in separating ______________ mixture.
a. solid-solid
b. solid-liquid
C. liquid-liquid
D. liquid-gas
Ans: b. solid-liquid
7. Among the following is not a mixture.
a. coffee with milk
b. lemon juice
c. water
d. ice cream embedded with nuts
Ans: c. water
II. Fill in the blanks.
1. Matter is made up of ____________.
Ans: atoms.
2. In solids, the space between the particles is less than in ____________ .
Ans: liquids and gases.
3. Grains can be separated from their stalks by _____________.
Ans: threshing
4. Chillies are removed from ‘Upma’ by ___________ method.
Ans: handpicking
5. The method employed to separate clay particles from water is
Ans: filtration
6. Water obtained from tube wells is usually ________ water.
Ans: pure
7. Which among the following will get attracted to by magnet? (safety pins, pencil and rubber band)
Ans: safety pins
III. State True or False. If false, correct the statement.
1. Air is not compressible.
Ans: False
Air is highly compressible
2. Liquids have no fixed volume but have fixed shape.
Ans: False
Liquids have fixed volume but do not have fixed shape.
3. Particles in solids are free to move.
Ans: False.
Particles in solids are tightly packed, so cannot move freely.
4. When pulses are washed with water before cooking, water is separated from them by filtration.
Ans: True
5. Strainer is a kind of sieve which is used to separate a liquid from solid.
Ans: False
Strainer is a kind of sieve which is used to separate solid from liquid.
6. Grain and husk can be separated by winnowing.
Ans: True
7. Air is a pure substance.
Ans: False
Air is a mixture of substances.
8. Butter from curd is separated by sedimentation.
Ans: False
Butter from curd is separated by Churning.
IV. Complete the given analogy.
1. Solid : Rigidity :: Gas : ____________.
Ans: Compressibility
2. Large Inter-particle space : Gas :: ____________ : solid.
Ans: Little inter-particle space
3. Solid : Definite shape :: ____________: Shape of the vessel.
Ans: Liquid
4. Husk-Grains : Winnowing :: Sawdust-Chalk piece :____________
Ans: Sieving
5. Murukku from hot oil :_______________ :: Coffee powder residue from decoction :____________
Ans: Filtration
6. Iron – sulphur mixture :____________ :: Mustard seeds from Urad-dhal : Rolling
Ans: Magnetic separation
V. Match the following.
a)
B)
VI. Answer very briefly.
1. Define the term matter.
Matter is anything that has mass and occupies space.
2. How can husk or fine dust particles be separated from rice before cooking?
The impurities can be separated by sedimentation and decantation methods.
Husk or fine dust particles are separated from rice by soaking the rice in water.
Lighter particles and impurities float in the water while the stone and other heavier impurities stay at the bottom of the vessel.
By carefully decanting the water, impurities can be removed.
3. Why do we separate mixtures?
To remove impurities from the mixtures.(Stones from Rice)
To separate two different useful compounds.(Petrol from Petroleum)
To remove non-useful components.(Churning curd to get butter)
4. Give an example for mixture and justify your answer with reason.
Seawater.
Seawater contains many kinds of salt and water in it, so it is an example for mixture.
5. Define - Sedimentation.
The heavier component in a mixture settles down once water is added to it, this process of separation is called sedimentation.
6. Give the main difference between a pure substance and an impure substance.
VII. Answer briefly.
1. A rubber ball changes its shape on pressing. Can it be called a solid?
Yes. It can be solid. Rubber ball has a definite shape and volume and these properties confirm that the rubber ball is solid.
2. Why do gases not have fixed shape?
The space between gas particles is very large and these particles are very loosely packed. So gasses do not have fixed shape.
3. What method will you employ to separate cheese (paneer) from milk? Explain.
By churning the milk vigorously, we can separate cheese from milk.
4. Look at the picture given below and explain the method of separation illustrated.
This method is called sieving.
Sieving is used when we have to separate solid particles of different sizes.
5. How can you separate a large quantity of tiny bits of paper mixed with pulses / dal?
Bits of paper mixed with pulses/dal can be separated by a winnowing method.
Paper is very light in weight and gets easily blown away by wind and pulses/ dal fall closer and form a separate heap.
6. What is meant by food adulteration?
The process of lowering the quality of food by the addition inferior substances or extraction of high valuable ingredients is called food adulteration.
7. Mr. Raghu returns home on a hot summer day and wants to have buttermilk. Mrs. Raghu has only curd. What can she do to get buttermilk? Explain
By churning the curd, Mrs.Raghu can get the buttermilk.
VIII. Higher Order Thinking Questions.
1. Distinguish the properties of solid, liquid and gas. Draw a suitable diagram.
2. Using suitable apparatus from your laboratory separate the mixture of chalk powder, mustard oil, water and coins. Draw a flowchart to show the separation process.
3. Justify your answer.
Arrangement of particles in three different phases of matter is shown above.
a) Which state is represented by Fig. 1?
Ans. Gaseous state is represented in figure 1.
b) In which state will the inter particle attraction be maximum?
Ans: In Figure 3 the inter particle attraction will be maximum.
c) Which one of them cannot be contained in an open vessel?
Ans: Figure 1 cannot be contained in an open vessel, because it is a gaseous state
d) Which one can take the shape of its container?
Ans: Figure2 can take the shape of its container.
4. Malar’s mother was preparing to cook dinner. She accidentally mixed ground nuts with urad-dhal. Suggest a suitable method to separate the two substances so that Malar can have ground nuts to eat.
The ground nuts can be separated by handpicking method, because groundnuts and urad-dhal are in different sizes.
For large quantities, we can use sieve to separate the groundnuts and urad-dhal.
5. In a glass containing some water, tamarind juice and sugar is added and stirred well. Is this a mixture? Can you tell why? Will this solution be sweet or sour or both sweet and sour?
Yes, it is a mixture.
Because three substances namely, water, tamarind juice and sugar were added together.
As the mixture contains both tamarind juice and sugar in it, it will taste both sour and sweet.
