National Science Olympiad Forum By SOF Olympiad Trainer - Page 474

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Subject :NSO    Class : Class 5

Ans 1:

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 2:

Class : Class 4

Ans 3:

Class : Class 7

Ans 4:

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

Ans 5:

Class : Class 6

Ans 6:

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

Ans 7:

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 8:

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

Ans 9:

Class : Class 9

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
OMG the correct order isn't even mentioned here!

Ans 12:

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

Ans 13:

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

Ans 14:

Class : Class 5

Ans 15:

Class : Class 5
EXACTLY!

Ans 16:

Class : Class 3

Ans 17:

Class : Class 3

Ans 18:

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

Ans 19:

Class : Class 10

Ans 20:

Class : Class 5

Ans 21:

Class : Class 5

Ans 22:

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 23:

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 24:

Class : Class 5
please no printing errors

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 5

Ans 1:

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 2:

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 3:

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

Ans 4:

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

Ans 5:

Class : Class 5
It’s both b and d

Ans 6:

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

Ans 7:

Class : Class 2
d

Ans 8:

Class : Class 5
it should be both B and D

Ans 9:

Class : Class 4
Both B and D are correct

Ans 10:

Class : Class 6
In platypus they lay eggs

Ans 11:

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

Ans 12:

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

Ans 13:

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 14:

Class : Class 6

Ans 15:

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

Ans 16:

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

Ans 17:

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

Ans 18:

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

Ans 19:

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

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
b is the correct answer

Ans 2:

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

Ans 3:

Class : Class 5

Ans 4:

Class : Class 5
Duck can't fly

Ans 5:

Class : Class 6
DUCKS CAN NOT FLY !!!

Ans 6:

Class : Class 6
a duck cannot fly !

Ans 7:

Class : Class 5
duck can not fly

Ans 8:

Class : Class 10

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

Class : Class 5
A duck cant fly

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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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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 10
please mention the phrase for piercing teeth with the detail solutions not just the answers please make these changes

Ans 2:

Class : Class 4
Piercing teeth is same as tearing teeth

Ans 3:

Class : Class 8
what are piercing teeth

Ans 4:

Class : Class 6
What are piercing teeth?

Ans 5:

Class : Class 3
piercing teeth and canines are the same thing in humans

Ans 6:

Class : Class 4
what are piercing teeth?

Ans 7:

Class : Class 4
is piercing teeth a canine?

Ans 8:

Class : Class 6

Ans 9:

Class : Class 5

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 3
ANSWER is D !!

Ans 2:

Class : Class 5

Ans 3:

Class : Class 5

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Subject :NSO    Class : Class 4

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