National Science Olympiad Forum By SOF Olympiad Trainer - Page 473

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

Ans 2:

Class : Class 6

Ans 3:

Class : Class 4

Ans 4:

Class : Class 10

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 5
please no printing errors

Ans 7:

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

Ans 8:

Class : Class 5

Ans 9:

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 10:

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 11:

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

Ans 12:

Class : Class 7

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 3

Ans 15:

Class : Class 5

Ans 16:

Class : Class 3

Ans 17:

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 18:

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 19:

Class : Class 9

Ans 20:

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 21:

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

Ans 22:

Class : Class 5
EXACTLY!

Ans 23:

Class : Class 5

Ans 24:

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

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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 5
DOLPHINS ARE MAMMALES. THEY HAVE TINY HAIRS

Ans 3:

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

Ans 4:

Class : Class 4
Both B and D are correct

Ans 5:

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 6:

Class : Class 6
In platypus they lay eggs

Ans 7:

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

Ans 8:

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 9:

Class : Class 5
It’s both b and d

Ans 10:

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

Ans 11:

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

Ans 12:

Class : Class 2
d

Ans 13:

Class : Class 6

Ans 14:

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

Ans 15:

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

Ans 16:

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

Ans 17:

Class : Class 5
it should be both B and D

Ans 18:

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 19:

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

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 5

Ans 1:

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

Ans 2:

Class : Class 5

Ans 3:

Class : Class 6
a duck cannot fly !

Ans 4:

Class : Class 5
A duck cant fly

Ans 5:

Class : Class 5
duck can not fly

Ans 6:

Class : Class 5
b is the correct answer

Ans 7:

Class : Class 6
DUCKS CAN NOT FLY !!!

Ans 8:

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

Ans 9:

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

Ans 10:

Class : Class 5
Duck can't fly

Ans 11:

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

Ans 12:

Class : Class 10

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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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