National Science Olympiad Forum By SOF Olympiad Trainer - Page 420
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Pragun goel from Venkateshwar International School, Delhi
Subject :NSO    Class : Class 5

Ans 1:

PRANAV VELDURTI from meridian school madhapur, hyderabad
Class : Class 9

Ans 2:

Srija Das from Sent Joseph Convent Chandannagar, Serampore
Class : Class 9

Ans 3:

Hari Govind from Delhi Public School Chandigarh , Chandigarh
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 4:

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

Ans 5:

Navya GUPTA from dps noida, Noida
Class : Class 3

Ans 6:

Anshu Manglik from Delhi Public School, Gurgaon
Class : Class 7

Ans 7:

Katelyn Asir from Kendriya Vidyalaya, Chennai
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 8:

Suresh Gyanchandani from St. Anselms Pink City Senior Secondary School, Jaipur
Class : Class 5
Correct option should be 1, 3, 2.

Ans 9:

Mithul Pranav KB from Narayana Olympiad School Madipakkam, Chennai
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 10:

Navya GUPTA from dps noida, Noida
Class : Class 3

Ans 11:

Mithul Pranav KB from Narayana Olympiad School Madipakkam, Chennai
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 12:

Swastik Srivastava from Baldwin Boys High School, Bangalore
Class : Class 5
correct order is 1-3-2 but there is no option

Ans 13:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4

Ans 14:

niuv from meridian, Hyderabad
Class : Class 6

Ans 15:

VAIBHAV RAI from Cambridge Court High School, JAIPUR
Class : Class 8
The correct order is 1-3-2 but there's no option having it

Ans 16:

samanvay sinha from School of India, Bangalore, bengaluru
Class : Class 5
please no printing errors

Ans 17:

Debashree Samanta from DPS BANGALORE , bangalore
Class : Class 5
the order is not 1-2-3. it is 1-3-2. but there is no option

Ans 18:

Devina kashyap from TPS, Mumbai
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

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Priyanshu Ku sahoo from KV no 1 Cuttack, Cuttack
Subject :NSO    Class : Class 4

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Kanishk Mukherjee from BDM International, Kolkata
Subject :NSO    Class : Class 5

Ans 1:

Saumyajyoti Mukherjee from Delhi Public School Bangalore East, Bangalore
Class : Class 5
d

Ans 2:

Vidula Malkar from DPYA High school, Mumbai
Class : Class 7
It is written not common then how will the ans be D

Ans 3:

Samith Ramesh from New Horizon Gurukul, Bangalore
Class : Class 5
Please check the solution, platypus, unlike the other mammals, lays eggs, so option D is correct.

Ans 4:

Aria Routray from V S Vidyalaya , Sunabeda
Class : Class 5
All of them don't have hair

Ans 5:

Mukta Pundir from ,
Class : Class 5
D is correct as only platypus laying egg and not rest. Thus it is not come since 1/4 of them lay eggs.

Ans 6:

anika from St Joseph sen sec school Mahoba, Kulpahar
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 7:

Diya Anilkumar from DPS Bangalore North, Bangalore
Class : Class 5
It’s both b and d

Ans 8:

Ginny Weasley from Hogwarts, London
Class : Class 6

Ans 9:

D M Sarvesh from Narayana Group of Schools, Mogappair
Class : Class 4
Both B and D are correct

Ans 10:

Ayushree Barman from Sri Sri Academy, Kolkata
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 11:

Hari Govind from Delhi Public School Chandigarh , Chandigarh
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 12:

harry potter from Hogwarts school of witchcraft and wizardry , london
Class : Class 5
it should be both B and D

Ans 13:

Dheeraj Thriyambak M from Sri Sankara Senior Secondary School Adyar, Chennai
Class : Class 6
platypus lays eggs! Go search it on google

Ans 14:

ADRIJA SAHA from DPS RANIPUR, Haridwar
Class : Class 6
In platypus they lay eggs

Ans 15:

Aayush from Amrita vidyalayam, Delhi
Class : Class 4
it is written not common and then also it's saying D

Ans 16:

Shaurya Gote from KV BSF Dantiwada, S K Nagar
Class : Class 5
DOLPHINS ARE MAMMALES. THEY HAVE TINY HAIRS

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Anupama from Gurukula international school , Javagal
Subject :NSO    Class : Class 3

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Kanishk Mukherjee from BDM International, Kolkata
Subject :NSO    Class : Class 5

Ans 1:

Devdarsh hero from HOLY GRACE, Mala
Class : Class 6
a duck cannot fly !

Ans 2:

Swastik Srivastava from Baldwin Boys High School, Bangalore
Class : Class 5
duck can not fly

Ans 3:

Reyan from , Chandigarh
Class : Class 2
ducks can fly but goose can fly more further

Ans 4:

Vedant Pandey from Manav Rachna International School, Gurgaon
Class : Class 5
A duck cant fly

Ans 5:

Shreejith from EuroSchool , Bangalore
Class : Class 7
Only few ducks fly. Maybe this is why it is B

Ans 6:

Smita De from Bishop Cotton Girls School, BANGALORE
Class : Class 6
DUCKS CAN NOT FLY !!!

Ans 7:

Jesslin Hephzibah from Bishop cotton girls school, bangalore
Class : Class 5
Which is the correct answer for this question/

Ans 8:

Riddhiman Bose from Don Bosco School, Kolkata
Class : Class 5

Ans 9:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 9

Ans 10:

Mukta Pundir from ,
Class : Class 5
Most ducks can actually fly except a few of them.

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adhiraj chaudhary from apeejay school noida, noida
Subject :NSO    Class : Class 4

Ans 1:

Bidyashree Panda from Royal Concord International School Begur, Bangalore
Class : Class 4
d is the correct ans.These all places are a great tourist attraction.

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soham mehta from St Andrews school Bowenpally, Secunderabad
Subject :NSO    Class : Class 8

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Mishika Singh from EISB, Bangalore
Subject :NSO    Class : Class 4

Ans 1:

Aadya from Vidyashilp , Bangalore
Class : Class 8
please mention the phrase for piercing teeth with the detail solutions not just the answers please make these changes

Ans 2:

Mishika Singh from EISB, Bangalore
Class : Class 5
What are piercing teeth?

Ans 3:

Shriyansh Kore from Innovative Public school Borawade, Kolhapur
Class : Class 4
what are piercing teeth?

Ans 4:

Bidyashree Panda from Royal Concord International School Begur, Bangalore
Class : Class 4
is piercing teeth a canine?

Ans 5:

Gunnika from MVN, Faridabad
Class : Class 3
piercing teeth and canines are the same thing in humans

Ans 6:

Mishika Singh from EISB, Bangalore
Class : Class 5

Ans 7:

Aryaveer And Shaurya Shinde from Goldcrest High Vashi, Navi Mumbai
Class : Class 9
what are piercing teeth

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Mishika Singh from EISB, Bangalore
Subject :NSO    Class : Class 4

Ans 1:

Gunnika from MVN, Faridabad
Class : Class 3
ANSWER is D !!

Ans 2:

Deveshi Sachdev from venkateshwar international school, New Delhi
Class : Class 5

Ans 3:

Ramvaros Kumar from Dps ranipur, haridwar
Class : Class 5

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Mishika Singh from EISB, Bangalore
Subject :NSO    Class : Class 4

Ans 1:

Deveshi Sachdev from venkateshwar international school, New Delhi
Class : Class 5
c

Ans 2:

Vedang Siddharth Thakare from SMT's Saraswati English Medium School., Thane
Class : Class 4

Ans 3:

Mishika Singh from EISB, Bangalore
Class : Class 5
Ans is D

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