National Science Olympiad Forum By SOF Olympiad Trainer - Page 479

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

Ans 2:

Class : Class 7

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

Class : Class 3

Ans 8:

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

Ans 9:

Class : Class 3

Ans 10:

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 11:

Class : Class 5

Ans 12:

Class : Class 5

Ans 13:

Class : Class 9

Ans 14:

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

Ans 15:

Class : Class 5

Ans 16:

Class : Class 5
EXACTLY!

Ans 17:

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 18:

Class : Class 6

Ans 19:

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

Ans 20:

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 21:

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 22:

Class : Class 4

Ans 23:

Class : Class 5
please no printing errors

Ans 24:

Class : Class 10

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
bat has microscopic hair, bear has fur, dolphin has hair when it is a baby, platypus has hair. platypus also lays eggs. so d is the answer

Ans 2:

Class : Class 6
platypus lays eggs! Go search it on google

Ans 3:

Class : Class 5
The answer should be B and D.

Ans 4:

Class : Class 4
it is written not common and then also it's saying D

Ans 5:

Class : Class 6
Why will the answer be D? The animals are dolphin, whale, bat, bear and platypus, and they are all mammals and give birth to young ones. This is a common feature, but the question says to mention the uncommon feature. The answer should be C for sure. The solution given is wrong.

Ans 6:

Class : Class 6
Please check the solution, platypus, unlike the other mammals, lays eggs, so option D is correct.

Ans 7:

Class : Class 4
Both B and D are correct

Ans 8:

Class : Class 5
DOLPHINS ARE MAMMALES. THEY HAVE TINY HAIRS

Ans 9:

Class : Class 6

Ans 10:

Class : Class 6
In platypus they lay eggs

Ans 11:

Class : Class 7
D is correct as only platypus laying egg and not rest. Thus it is not come since 1/4 of them lay eggs.

Ans 12:

Class : Class 7
It is written not common then how will the ans be D

Ans 13:

Class : Class 5
they all are mammals and give birth to young ones whereas dolphin and whales do not have hairs on their body

Ans 14:

Class : Class 5
Dolphins do not have hairs and you don't know how to spell " Mammals "

Ans 15:

Class : Class 5
All of them don't have hair

Ans 16:

Class : Class 5
it should be both B and D

Ans 17:

Class : Class 5
it should be B because bat doesn't have hair or fur. So, it is not common with all animals

Ans 18:

Class : Class 5
It’s both b and d

Ans 19:

Class : Class 3
d

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
A duck cant fly

Ans 2:

Class : Class 5

Ans 3:

Class : Class 6
a duck cannot fly !

Ans 4:

Class : Class 6
DUCKS CAN NOT FLY !!!

Ans 5:

Class : Class 5
duck can not fly

Ans 6:

Class : Class 10

Ans 7:

Class : Class 2
ducks can fly but goose can fly more further

Ans 8:

Class : Class 5
Which is the correct answer for this question/

Ans 9:

Class : Class 7
Most ducks can actually fly except a few of them.

Ans 10:

Class : Class 5
Duck can't fly

Ans 11:

Class : Class 7
Only few ducks fly. Maybe this is why it is B

Ans 12:

Class : Class 5
b is the correct answer

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
d is the correct ans.These all places are a great tourist attraction.

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