State whether the following statements are true or false.
(a) A mixture of oil and water can be separated by filtration.
(b) Water can be separated from salt by evaporation.
(c) A mixture of wheat grains and wheat flour can be separated by sieving.
(d) A mixture of iron filings and rice flour can be separated by magnet.
(e) A mixture of wheat grains and rice flakes can be separated by winnowing.
(f) A mixture of tea leaves and milk can be separated by decantation.
Fill in the blanks with appropriate words:
(i) Small pieces of stone can be removed from rice by__________.
(ii) ___________ are obtained from stalks by threshing.
(iii) Husk from wheat flour is generally removed by__________.
(iv) The process of settling of heavier particles is called__________.
(iv) Filtration is helpful in separating an insoluble __________from a __________.
Sheela, Saima and Ravi have to dissolve maximum amount of
sugar in the same amount of milk so as to win in a game. Ravi
took hot boiling milk while Saima took ice cold milk. Sheela
managed to get milk at room temperature. Whom do you think
would win the game and why?
Paheli asked for a glass of water from Boojho. He gave her a
glass of ice cold water. Paheli observed some water droplets on
the outer surface of the glass and asked Boojho how these
droplets of water were formed? Which of the following should
be Boojho’s answer?
(a) Evaporation of water from the glass.
(b) Water that seeped out from the glass.
(c) Evaporation of atmospheric water vapour.
(d) Condensation of atmospheric water vapour.
During summer, Boojho carries water in a transparent plastic
bottle to his school. One day he left his bottle in the school. The
bottle still had some water left in it. The following day, he observed
some water droplets on the inner surface of the empty portion
of the bottle. These droplets of water were formed due to
(a) boiling and condensation.
(b) evaporation and saturation.
(c) evaporation and condensation.
(d) condensation and saturation
In an activity, a teacher dissolved a small amount of solid copper
sulphate in a tumbler half filled with water. Which method
would you use to get back solid copper sulphate from the
solution?
(a) Decantation
(b) Evaporation
(c) Sedimentation
(d) Condensation
You might have observed the preparation of ghee from butter
and cream at home. Which method(s) can be used to separate
ghee from the residue?
(i) Evaporation
(ii) Decantation
(iii) Filtration
(iv) Churning
Which of the following combination is the correct answer?
(a) (i) and (ii) (b) (ii) and (iii)
(c) (ii) and (iv) (d) (iv) only
While preparing chapatis, Paheli 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?
(a) Threshing
(b) Sieving
(c) Winnowing
(d) Filtration
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)
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