National Science Olympiad Forum By SOF Olympiad Trainer - Page 691
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OISHIK KUNDU from Delhi Public school North kolkata, baranagar
Subject :NSO    Class : Class 4

Ans 1:

Mahadevan from KV Rubber Board Kottayam, Kottayam
Class : Class 9
d is the answer

Ans 2:

Tvisha Bindal from Manav Rachna International School Sector 14, Faridabad
Class : Class 4
Its D

Ans 3:

Tvisha Bindal from Manav Rachna International School Sector 14, Faridabad
Class : Class 4
not sure

Ans 4:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
please help help master answer explain

Ans 5:

Sheel Mehta from Riverside, Ahmedabad
Class : Class 4
The Correct Answer Is A

Ans 6: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is A.

Ans 7:

Shaurya Suryawanshi from The Orbis school, Pune
Class : Class 7
it's 'd' or 'a'..... not sure

Ans 8:

ishit from EUROSCHOOL THANE, THANE WEST
Class : Class 7
Can you tell the answer to this question

Ans 9:

Harini from vibgyor high, bangalore
Class : Class 3

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parisasingh from Greenwood High, Bengaluru
Subject :NSO    Class : Class 6

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SHREYASHI.CHANDRA from DPS Noida, Greater Noida West
Subject :NSO    Class : Class 4

Ans 1:

arpita Jaiswal from bhartiya vidya bhavan, wardha
Class : Class 4
Please give solution

Ans 2:

Sukrit from Swami vivekanand high school , Mumbai
Class : Class 6
HOW MANY SQUARES ARE THERE AND GIVE SOLUTION

Ans 3:

Kavitharini Joseph from HUS, Chennai
Class : Class 6
i cant count please give solution

Ans 4:

ADITYA ROY from VIDYASAGAR SHISHU NIKETAN, MEDINIPUR
Class : Class 5
This answer should be three.

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Shaunak Mahapatra from Mount Litera Zee School, Contai
Subject :NSO    Class : Class 6

Ans 1:

Aishwarya B from Shantiniketan International School , Hyderabad, HYD
Class : Class 9
D

Ans 2:

Kaashvi Sharma from Bal Bharati Public School, GRHM, New Delhi
Class : Class 8

Ans 3:

harry potter from hogwarts, hogsmeade
Class : Class 6

Ans 4:

Arjun gupta from Dps noida , Noida
Class : Class 7
should be A

Ans 5:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
A means A. Aarya you are right

Ans 6:

Suhani Agarwal from St. Mary's ICSE School, Mumbai
Class : Class 8

Ans 7:

Pratham Dave from GNS, Bangalore
Class : Class 7
It shows that the effort is in between and load and fulcrum are at the ends .

Ans 8:

Ritabrata Das from OPJS, Angul
Class : Class 7
It should be both a

Ans 9:

AARAV AGRAWAL from BIRLA DIVYA JYOTI, SILIGURI
Class : Class 8
It is C.. Cuz the fulcrum is at one end..

Ans 10:

Satwik Dixit from Christ Academy, Bangalore
Class : Class 7
its definitely a

Ans 11:

Aprameyan Baranidar from Seven senses Montessori, Bengaluru
Class : Class 6
It is A

Ans 12:

Aishwarya B from Shantiniketan International School , Hyderabad, HYD
Class : Class 9
I meant c

Ans 13:

Aarya Singh from Indian School Ghubra, Muscat
Class : Class 3
It's A, as in a hammer, the fulcrum, that is the place were the head of the hammer and rod of the hammer meet is in center, the load which is the nail is on one end and the effort we apply is on the other end

Ans 14:

Lakshmi from FPS, Bangalore
Class : Class 10
It will not be A because in first class lever the fulcrum lies between load and effort but in hammer effort lies between fulcrum and load

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Bibhu biswajit Jena from Kendriya Vidyalaya, Kendrapara
Subject :NSO    Class : Class 8

Ans 1:

ketaki kul from sanskriti school, Pune
Class : Class 10
Mirage is an optical illusion caused due to refraction of light.

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AKSHITA DIXIT from R K SARDA VIDYA MANDIR, RAIPUR
Subject :NSO    Class : Class 6

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AKSHITA DIXIT from R K SARDA VIDYA MANDIR, RAIPUR
Subject :NSO    Class : Class 6

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AKSHITA DIXIT from R K SARDA VIDYA MANDIR, RAIPUR
Subject :NSO    Class : Class 6

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Pratibha from Vaels billabong international, Chennai
Subject :NSO    Class : Class 4

Ans 1:

Vibhor Mudgal from GBN School, Faridabad
Class : Class 4

Ans 2:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Aarush , there will be not enough plants to feed so many water insects . So, at a particular time all plants will finish . So , there will be nothing left for the water insects so they will also die !

Ans 3:

Gurnoor from Chitkara International School, Chandigarh
Class : Class 4
ans is c

Ans 4:

Abhigyan Sinha from Podar International School, Powai, Mumbai, Mumbai
Class : Class 7
correct answer is C

Ans 5:

Kriti Bhonsale from Delhi Public School, Bengaluru
Class : Class 5
C

Ans 6:

Aarush Pandya from Inventure Academy, Bangalore
Class : Class 8
The correct answer is C because if organism X wipes out all tadpoles in the community, then water insects' population grows with nothing to eat them. The small fish die because they have nothing to eat, and soon the big fish die too.

Ans 7:

Manan thorat from Podar powai, Mumbai
Class : Class 4
The answer is C

Ans 8: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is C.

Ans 9:

Manjeet Prajapati from Saint Xavier College BHEL Jhansi , Jhansi
Class : Class 4
In the given food chain, tadpole feeds on water insect and in turn is eaten by small fish. If population of tadpole will decline with time then small fish population will also decrease as former is the food of later. On the other hand, water insect population will be positively affected because in the absence of predator prey population reproduces and flourishes.

Ans 10:

k tagore from montessori school, KURNOOL
Class : Class 3
The correct answer is c

Ans 11:

Rishaan Dixit from DPS Noida, Noida
Class : Class 5
cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Ans 12:

Mihika Talukdar from GARDEN HIGH, KOLKATA
Class : Class 4

Ans 13:

Raashid Sarfraz from IIPS, Riyadh
Class : Class 6

Ans 14:

Priyanshi from Delhi Public School, Gurugram
Class : Class 4
the correct answer is C

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AKSHITA.KRISHNAN from DPS Noida, Noida
Subject :NSO    Class : Class 3

Ans 1:

from M G M Senior Secondary school Sec-6,
Class : Class 5
A

Ans 2:

SARTHAK.SHUKLA from Delhi Public School, Noida, Noida
Class : Class 3
Answer is D because at night plants take in oxygen and give out carbon-di-oxide whereas we humans always take in oxygen and give out carbon-di-oxide.

Ans 3:

SAMRIDDHA PANDA from ST. MONFORT'S SENIOR SECONDARY SCHOOL, BARUIPUR
Class : Class 7

Ans 4:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
ans is A as the order of gases will not change

Ans 5:

Soham from Golden Earth Global School, Sangrur, Sangrur
Class : Class 3
A

Ans 6:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
Sorry ,answer is A .I gave wrong explanation why .You have told arerespectively, so gas 1 is carbon dioxide and gas 2 is oxygen.You have given the order as 1 and 2 i.e. carbon dioxide and oxygen.So ,we will say it as 2 and 1 i.e oxygen and carbon dioxide .Hence answer is A.

Ans 7:

Abhijay Saha from Delhi Public School, Megacity, Kolkata
Class : Class 3
We Don't know that plants breath oxygen in night

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