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Free download in PDF CBSE Class 6 Science Short Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 6 Students.
41
Salt can be separated from its solution (salt dissolved in water), because
[A]
mixing of salt in water is a change that can be reversed by evaporation
[B]
mixing of salt in water is a permanent change.
[C]
mixing of salt in water is a change that can be reversed by heating and melting of salt.
[D]
mixing of salt in water is a change that cannot be reversed.
Answer: mixing of salt in water is a change that can be reversed by evaporation.
42
Which of the following is a desirable change?
[A]
Burning of House
[B]
Floods
[C]
Landslides
[D]
Burning of cooking gas
43
Which of the following is a reversible change?
[A]
Curdling of milk
[B]
Ripening of fruits
[C]
Melting of ice
[D]
Burning of wood
44
Baking of dough into bread is a kind of change
[A]
that can be reversed
[B]
that cannot be reversed
[C]
that can be reversed at very hot temperature
[D]
can't say
Answer: that cannot be reversed
45
The process of converting vapours back into liquid is called as ______.
[A]
condensation
[B]
evaporation
[C]
sedimentation
[D]
filtration
46
Which method is commonly used to separate salt from water?
[A]
sedimentation
[B]
filtration
[C]
evaporation
[D]
condensation
47
During filtration process, the dust particles which remain on filter paper is called _________.
[A]
filter
[B]
residue
[C]
filtrate
[D]
solution
48
Transferring the clear liquid into another container using a glass rod is called ___________.
[A]
sedimentation
[B]
decantation
[C]
filtration
[D]
condensation
49
In sedimentation process, the clear liquid above the settled heavier component is called ________.
[A]
solvent
[B]
solution
[C]
supernatant liquid
[D]
sediment
Answer: supernatant liquid
50
The heavier component in a mixture settles after water is added to it, the process is called ________
[A]
sedimentation
[B]
decantation
[C]
filtration
[D]
condensation
51
Pebbles and stones are removed from sand by ________
[A]
Winnowing
[B]
Sieving
[C]
Threshing
[D]
Decanting
52
Which method is commonly used by farmers to separate lighter husk particles from heavier seeds of grain.
[A]
Winnowing
[B]
Sieving
[C]
Threshing
[D]
Decanting
53
The process used for separating grains from stalk is called _________.
[A]
Winnowing
[B]
Sieving
[C]
Threshing
[D]
Decanting
54
The method of separating substances based on size, colour and shape is called _______.
[A]
Handpicking
[B]
Winnowing
[C]
Sieving
[D]
Threshing
55
Salt is obtained from sea water by using which of the following process.
[A]
Sedimentation
[B]
Condensation
[C]
Evaporation
[D]
Centrifugation
56
The process of solid changing directly in vapour form without becoming liquid is called
[A]
sedimentation
[B]
sublimation
[C]
evaporation
[D]
condensation
57
Air is a __________
[A]
mixture
[B]
compound
[C]
pure substance
[D]
none of these
58
The solubility of water __________ with an increase in water.
[A]
increases
[B]
decreases
[C]
remains same
[D]
sometimes increases and sometimes decreases
59
'Combine' is used in which of the following?
[A]
threshing
[B]
winnowing
[C]
sieving
[D]
filtration
60
The spinner in washing machine dries clothes works on the principle of
[A]
evaporation
[B]
sedimentation
[C]
filtration
[D]
centrifugation
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