National Science Olympiad Forum By SOF Olympiad Trainer - Page 472

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 7
B

Ans 2:

Class : Class 3
B

Ans 3:

Class : Class 3
B

Ans 4:

Class : Class 7
it is sure sure B

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 8

Ans 2:

Class : Class 7
D

Ans 3:

Class : Class 7
ans:D

Ans 4:

Class : Class 8
Why answer is not D.

Ans 5:

Class : Class 4
ans is d

Ans 6:

Class : Class 3
It is D

Ans 7:

Class : Class 7
ans:D

Ans 8:

Class : Class 5
d

Ans 9:

Class : Class 3
how??

Ans 10:

Class : Class 3
d

Ans 11:

Class : Class 5
wtf

Ans 12:

Class : Class 3
none of these

Ans 13:

Class : Class 7
ans:D

Ans 14:

Class : Class 3
D

Ans 15:

Class : Class 7
D non of these

Ans 16:

Class : Class 4
D

Ans 17:

Class : Class 7
ans:D

Ans 18:

Class : Class 3
C

Ans 19:

Class : Class 3
D

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 3

Ans 2:

Class : Class 5
correct order is 1-3-2 but there is no option

Ans 3:

Class : Class 5

Ans 4:

Class : Class 6

Ans 5:

Class : Class 8
The correct order is 1-3-2 but there's no option having it

Ans 6:

Class : Class 5
The correct order is 1-3-2 and there is no option like that .So,I think that it might be a printing error.

Ans 7:

Class : Class 5
(i) Sedimentation - Sedimentation is a physical water purification process using gravity to remove suspended solid impurities from water. The water is allowed to stand till the suspended solid impurities, which are heavier than water, are pulled down by gravity and settle at the bottom of the container.(ii) Chlorination - Chlorination is the process of adding chlorine, or chlorine compounds such as sodium hypochlorite, to drinking water to disinfect it and kill germs. The addition of chlorine will also oxidize any iron, manganese and/or hydrogen sulphide that are present, so that they too can be removed in the filtration process later on.(iii) Filtration - Filtration is a process of water purification, which is used to separate solid impurities from water by using a filter medium that allows the water to pass through but not the solid impurities. These solid impurities are not heavy, so they do not settle at the bottom, but remain suspended. So, a filter is used to trap them.So, to purify water, it must go through sedimentation (i) first, so that heavier and larger size impurities like sand and dirt, are allowed to settle at the bottom of the container and are removed first. Next, water must go through chlorination (ii), so that bacteria and germs present in water are killed. Any iron, manganese and/or hydrogen sulphide, if present, also get oxidized by chlorine. These can be removed later by the filtration (iii) process, along with other suspended impurities.Hence, the right answer is Option D.

Ans 8:

Class : Class 5
The correct option should be - 1-3-2 ( Sedimentation - Filtration - Chlorination )This option is not given. Sedimentation - All the particles settle down as gravity pulls the heavier sediments down.Filtration - It removes the sediments from the water.Chlorination - Process of adding chlorine to water and removing the parasites,bacteria and viruses. Now the water is purified.

Ans 9:

Class : Class 5
EXACTLY!

Ans 10:

Class : Class 5

Ans 11:

Class : Class 5
Correct option should be 1, 3, 2.

Ans 12:

Class : Class 5

Ans 13:

Class : Class 6
the order is not 1-2-3. it is 1-3-2. but there is no option

Ans 14:

Class : Class 5
The answer is 1-3-2

Ans 15:

Class : Class 4
the correct order is 1,3,2 but there is no option like that but if you look at option A you'll find the correct order in a descending order (from back) so if there is no option like 1,3,2 then A should be correct

Ans 16:

Class : Class 5
please no printing errors

Ans 17:

Class : Class 9

Ans 18:

Class : Class 7

Ans 19:

Class : Class 7
the order should be 1-3-2 . there is no option like that. what are these SOF people

Ans 20:

Class : Class 5
OMG the correct order isn't even mentioned here!

Ans 21:

Class : Class 10

Ans 22:

Class : Class 3

Ans 23:

Class : Class 4

Ans 24:

Class : Class 6
1-3-2 is the correct order as first we should remove all the insoluble impurities and the the soluble impurities.

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