Tamilnadu Samacheer Kalvi 6th Science Solutions Term 1 Chapter 3 Matter Around Us
Samacheer Kalvi 6th Science Matter Around Us Text Book Back Questions and Answers
I. Choose the correct answer:
Question 1.
………. is not made of matter
(a) Gold ring
(b) iron nail
(c) light ray
(d) oil drop
Answer:
(a) light ray
Question 2.
200 ml of water is poured into a bowl of 400ml capacity. The volume of water
now will be _____
(a) 400 ml
(b) 600 ml
(c) 200 ml
(d) 800 ml
Answer:
(c) 200 ml
Question 3.
Seeds from water-melon can be removed by method.
(a) Hand-picking
(b) filtration
(c) magnetic separation
(d) decantation
Answer:
(c) Hand picking
Question 4.
Lighter impurities like dust, when mixed with rice or pulses, can be removed by
_____
(a) filtration
(b) sedimentation
(c) decantation
(d) winnowing
Answer:
(d) winnowing
Question 5.
………… of is essential to perform winnowing activity
(a) Rain
(b) Soil
(c) Water
(d) Air
Answer:
(d) Air
Question 6.
Filtration method is effective in separating _____ mixture.
(a) solid – solid
(b) solid – liquid
(c) liquid – liquid
(d) liquid – gas
Answer:
(b) solid – liquid
Question 7.
From the following ………. is not a mixture
(a) Coffee with milk
(b) lemon juice
(c) Water
(d) ice cream embedded with nuts.
Answer:
(c) Water
II Fill in the
blanks
1.Matter is made up of atoms
2.In solids, the space between the
particles is less than in a
liquids
3.Grains can be separated from their
stalks by Threshing
4.Chillies are
removed from ‘upma’ by hand
picking method.
1.The method employed to separate clay
particles from water is Filtration
2.Among the following items: Safety pins,
pencil and rubber band, Safety
pin. will get attracted to a magnet.
3.Water obtained from tube wells is
usually impure. Water
III. State whether the following statements are True or
False. If false give the correct statement
1. Air is not compressible.
False. Air is
Compressible.
2. Liquids have no fixed volume but
have fixed shape.
False. Liquids
have no fixed shape but have fixed volume.
3. Particles in solids are free to
move.
False. Particles
in solids are not free to move.
4.When pulses are washed with water
before cooking, the water is separated from them by the process of filtration.
False. When pulses
are washed with water before cooking, the water is separated from them by the
process of Decantation.
5.Strainer is a kind of sieve which is
used to separate a liquid from solid
False. Strainer is a kind
of sieve which is used to separate a solid from liquid.
6. Grain and husk can be separated by
winnowing True
7. Air is a pure substance
False. Air is a
mixture. (Or) Air is not a pure substance.
8. Butter from curds is separated by
sedimentation.
False. Butter from
curds is separated by churning.
IV. Complete
the given analogy
Solid: rigidity :: gas: Compressibility
Large Inter-particle
space: gas:: Little inter-particle space : solid
Solid : definite shape :: Liquids : shape of
the vessel.
Husk-grains: winnowing:: Sawdust-chalk
piece: Sedimentation and Decantaium
Murukku from hot
oil: Hand picking; Filtralion.
:: coffee powder residue from decoction
Iron-sulphur mixture:
Magnetic Separation ::
Mustard seeds from Urad-dhal:
Rolling
V. Match the following.
a)
Property Example
Breaks easily (Brittle) Mud pot
Bends readily Plastic wire
Can be stretched easily Rubber
band
Gets compressed easily Cotton wool
Gets heated readily Metal pan
VI. Very short answer
Question 1.
Define the term matter.
Answer:
The matter is defined as anything that has mass and takes up space. The matter
is found in solid, liquid, and gas.
Question 2.
How can
husk or fine dust particles be separated from rice before cooking?
Answer:
Before cooking, the husk or fine dust particles in rice are being separated by
‘Sedimentation’. The lighter impurities float while heavier rice grains sink to
the bottom.
Question 3.
Why do
we separate mixtures?
Answer:
A mixture is an impure substance and contains more than one kind of particles.
So, we have to separate mixtures.
Question 4.
Give an
example for mixture and justify your answer with reason.
Answer:
An example of a mixture is 22 Carat Gold. This is composed of Gold and Copper
(or) Gold and Cadmium.
Question 5.
Define
Sedimentation.
Answer:
Sedimentation is the deposition process of setting down of heavy solids in a
mixture of liquid and an insoluble solid.
Question 6.
Give
the main difference between a pure substance and an impure substance.
Answer:
Pure Substance
:
Made up of only one kind of particles.
Cannot be separated by physical means.
Impure Substance :
Has particles of other Substance mixed in it.
Can be separated by physical means.
VII. Short Answer.
Question 1.
A
rubber ball changes its shape on pressing. Can it be called a solid?
Answer:
Yes. A solid has a certain shape and size. The shape of a rubber ball changes
only if we squeeze it.
Question 2.
Why do
gases not have fixed shape?
Answer:
Gases do not have a fixed shape due to the weak forces of attraction between
the gaseous particles. Hence, they can flow and take shape of the container.
Question 3.
What
method will you employ to separate cheese (paneer) from
milk? Explain.
Answer:
“Churning followed by Coagulation” is employed to separate cheese (Paneer) from
milk. There are six important steps in making cheese (Paneer) from
milk:
Acidification coagulation
separating curds and whey Salting
Shaping ripening
Question 4.
Look at
the picture given below and explain the method of separation illustrated.
Answer:
The given
picture shows the ‘Sieving’ method of separation. It is used to separate the
solid particles of different sizes.
Example: Bran
from flour; Sand from gravel.
Question 5.
How can
you separate a mixture of a large number of tiny bits of paper mixed with
pulses/dal?
Answer:
We can separate the mixture of a large number of tiny bits of paper and pulses/dal by
“Winnowing”. The lighter papers will be carried by wind and heavier pulses/dais
will fall closer and form a separate heap.
Question 6.
What is
meant by food adulteration?
Answer:
The process of mixing harmful and unwanted substances with the foodstuffs that
we buy in the market is called food adulteration
Question 7.
Mr. Raghu
returns home on a hot summer day and wants to have buttermilk. Mrs. Raghu has
only curds. What can she do to get buttermilk? Explain.
Answer:
Mrs. Raghu has to
take half a cup of curd, add half a cup of water to it, and mix well. Now, she
can serve buttermilk.
VIII. Answer In Detail.
Question 1.
Distinguish
between properties of solid, liquid, gas. Draw a suitable diagram.
Answer:
Question 2.
Using a
suitable apparatus from your laboratory, separate the mixture of chalk powder,
mustard oil, water, and coins. Draw a flow chart to show the separation
process.
Answer:
HOTS
Question 1.
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.
Answer:
The groundnuts shall be separated by hand-picking method because they are in a
different size When compared with urad-dhal.
Question 2.
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?
Answer:
A glass containing some water, Tamarind
juice, and sugar is a mixture.
Because it is made up of two or more
ingredients that are physically separable.
This mixture is both sweet and sour.
Question 3.
Justify
your answer.
An
arrangement of particles in three different phases of matter is shown above.
(a) Which state is represented by
fig. I?
Answer:
Figure 1 represents a gas.
(b) In which will be the interparticle
attraction maximum?
Answer:
Inter Particle attraction is maximum in solids (fig. 3)
(c) Which one of them cannot be
contained in an open vessel?
Answer:
A gas (fig. 1) cannot be contained in an open vessel.
(d) Which one can take the shape of
its container?
Answer:
Liquid (fig.2) can take the shape of its container.
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