CBSE Class 6 Science Quiz | CBSE Class 6 Science Short Questions & Answers

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Questions
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

Answer: Floods
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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

Answer: Melting of ice
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

Answer: condensation
46 Which method is commonly used to separate salt from water?
A sedimentation
B filtration
C evaporation
D condensation

Answer: evaporation
47 During filtration process, the dust particles which remain on filter paper is called _________.
A filter
B residue
C filtrate
D solution

Answer: residue
48 Transferring the clear liquid into another container using a glass rod is called ___________.
A sedimentation
B decantation
C filtration
D condensation

Answer: decantation
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

Answer: sedimentation
51 Pebbles and stones are removed from sand by ________
A Winnowing
B Sieving
C Threshing
D Decanting

Answer: Sieving
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

Answer: Winnowing
53 The process used for separating grains from stalk is called _________.
A Winnowing
B Sieving
C Threshing
D Decanting

Answer: Threshing
54 The method of separating substances based on size, colour and shape is called _______.
A Handpicking
B Winnowing
C Sieving
D Threshing

Answer: Handpicking
55 Salt is obtained from sea water by using which of the following process.
A Sedimentation
B Condensation
C Evaporation
D Centrifugation

Answer: Evaporation
56 The process of solid changing directly in vapour form without becoming liquid is called
A sedimentation
B sublimation
C evaporation
D condensation

Answer: sublimation
57 Air is a __________
A mixture
B compound
C pure substance
D none of these

Answer: mixture
58 The solubility of water __________ with an increase in water.
A increases
B decreases
C remains same
D sometimes increases and sometimes decreases

Answer: increases
59 'Combine' is used in which of the following?
A threshing
B winnowing
C sieving
D filtration

Answer: threshing
60 The spinner in washing machine dries clothes works on the principle of
A evaporation
B sedimentation
C filtration
D centrifugation

Answer: centrifugation

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