Multiple Choice Questions
1. Butter is separated from milk by
(a) sedimentation
(b) filtration
(c) churning
(d) decantation
Answer:
(c) churning
2. Filtration is a method to separate
the components of a
(a) solution
(b) mixture of a liquid and an
insoluble substance
(c) both (a) and (b)
(d) pure substance
Answer:
(b) mixture of a liquid and an insoluble substance
3. Which method is used to separate
pebbles and stones from sand?
(a) Handpicking
(b) Winnowing
(c) Sieving
(d) Any of these
Answer: (c) Sieving
4. Sand from water is separated by
(a) sieving
(b) evaporation
(c) filtration
(d) sedimentation and decantation
Answer: (d) sedimentation and
decantation
5. The process of conversion of water
into its vapours is called
(a) evaporation
(b) condensation
(c) guttation
(d) transpiration
Answer: (a) evaporation
6. A mixture of ammonium chloride and
sand is separated by
(a) evaporation
(b) decantation
(c) sublimation
(d) filtration
Answer: (c) sublimation
Ques1. How will you separate sand and
water from their mixture?
Ans. We will separate sand and water by
sedimentation and decantation method. First we leave this mixture for some
time. After some time, the sand which is;
heavier is settled down at the bottom.
After that we wall pour water into another container and the mixture will be
separated.
Ques2. What is filtration?
Answer:
When one component of a mixture is
soluble in water and other component is insoluble in water, the soluble
component gets dissolved and insoluble one is separated
by filtering the solution.
Ques3. Differentiate between saturated
and unsaturated solutions.
Answer:
Saturated solution: A solution in which
no more solute can be dissolved at a given temperature.
Unsaturated solution: A solution in
which more solute can be dissolved at any temperature.
Ques4. Name the property of the
components used for separating the following mixtures:
a. salt and camphor
b. wheat and husk
c. iron fillings and saw-dust
d. coconut oil and water.
Answer:
a. sublimation
b. winnowing
c. magnetic separation
d. separating funnel.
Ques5. What is handpicking? When this
method is used?
Answer:
The method in which the constituents
are separated by simply picking them up by hand is called hand-picking. It is
used when there is a difference in size, colour,
shape of desirable and undesirable
constituents.
Ques6. What is decantation?
Answer:
Decantation is the process of
separating insoluble solids from liquids. A suspension of solid particles in
liquid is allowed to stand for some time. Solid particles settle
down at the bottom. The clear water is
then transferred into another beaker.
Ques7. Which method of separation will
you adopt to separate a mixture of wheat flour, moong dal and chana?
Answr: When two or more than two
substances are mixed together in any ratio then it is called a mixture.
Question 1.
Match the following items given in Column A with that in Column B:
|
Column A |
Column B |
|
(a) Handpicking |
(i) Conversion of
water vapours into liquids |
|
(b) Threshing |
(ii) Separating bran
from flour |
|
(c) Winnowing |
(iii) Separating
larger size impurities |
|
(d) Sieving |
(iv) Separating
butter from milk |
|
(e) Sedimentation |
(v) Conversion of
water into Us vapours |
|
(f) Evaporation |
(vi) Separating
grains from its stalks |
|
(g) Condensation |
(vii) Settling of
heavier components at bottom |
|
(h) Churning |
(viii) Separation by
wind or by blowing air |
Answer:
|
Column A |
Column B |
|
(a) Handpicking |
(iii) Separating
larger size impurities |
|
(b) Threshing |
(iv) Separating
grains from its stalks |
|
(c) Winnowing |
(viii) Separation by
wind or by blowing air |
|
(d) Sieving |
(ii) Separating bran
from flour |
|
(e) Sedimentation |
(vii) Settling of
heavier components at bottom |
|
(f) Evaporation |
(v) Conversion of
water into its vapours |
|
(g) Condensation |
(i) Conversion of
water vapours into liquids |
|
(h) Churning |
(iv)
Separating butter from milk |
