National Science Olympiad Forum By SOF Olympiad Trainer - Page 696
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Pratibha from Vaels billabong international, Chennai
Subject :NSO    Class : Class 4

Ans 1:

Raashid Sarfraz from IIPS, Riyadh
Class : Class 6

Ans 2: (Master Answer)

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

Ans 3:

Mihika Talukdar from GARDEN HIGH, KOLKATA
Class : Class 4

Ans 4:

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

Ans 5:

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 6:

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

Ans 7:

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

Ans 8:

Vibhor Mudgal from GBN School, Faridabad
Class : Class 4

Ans 9:

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

Ans 10:

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 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

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.

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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:

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 3:

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 4:

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

Ans 5:

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

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:

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

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

Ans 1:

Gaurang Mahesh Mahamunkar from Lodha World School Thane, Thane
Class : Class 4
Figure A can be folded horizontally, figure B can be folded diagonally, figure D can be folded vertically to get their mirror images whereas figure C is asymmetric, so the odd one out is figure C

Ans 2:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9

Ans 3:

Ananya D from Sacred Heart School, Thane
Class : Class 8

Ans 4:

Shivani Shivu Singh from Pawar Public School Chandivili , Mumbai
Class : Class 8

Ans 5:

SARTHAK.SHUKLA from Delhi Public School, Noida, Noida
Class : Class 3
Answer is asymmetrical figure, because all the other figures are symmetrical.

Ans 6:

akshitha from Euroschool, Bengaluru
Class : Class 3
i cant understand the second question c] or b]?

Ans 7:

BRIHA PURI from CAMBRIDGE PUBLIC SCHOOL, BANGALORE
Class : Class 3
nonsense question

Ans 8:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
The images given in Options A, B and D are symmetrical images. That means all three have at least one line of symmetry. Line of symmetry is any line drawn through the image which divides the image into two exactly equal parts, and these parts are mirror images of each other. A.The part above the red line (line of symmetry) and the 7part below the red line are mirror images of each other.7410`1 B.The parts on both sides of the red line (line of symmetry) are mirror images of each other. C.There can be no line of symmetry that can divide this image into two equal parts which are mirror images of each other. D.The part on the left side of the red line (line of symmetry) and the part on the right side of the red line are mirror images of each other. Hence, Option C is the odd one out.

Ans 9:

Abhijato Chatterjee from Bharatiya Vidya Bhavan, Kolkata, kOLKATA
Class : Class 6
why?

Ans 10:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
ANS should be a

Ans 11:

Tanisha Nath from Clarence Public school Bangalore, Bengaluru
Class : Class 9
why

Ans 12:

Shivani Shivu Singh from Pawar Public School Chandivili , Mumbai
Class : Class 8

Ans 13:

BRIHA PURI from CAMBRIDGE PUBLIC SCHOOL, BANGALORE
Class : Class 3
understood

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Mridul Jain from Shishukunj International School Indore, Indore
Subject :NSO    Class : Class 4

Ans 1:

somesh from Centre point katol road, Nagpur
Class : Class 6
d

Ans 2:

Aarvi Gosai from The New Tulip International School, ahemdabad
Class : Class 4
no u DUMMIES! winter should be on the east side of the earth and summer on the west and Goutham this question is sooooo WRONG! and ur wrong Goutham

Ans 3:

XXX from SVM, Bangalore
Class : Class 5
please explain how is it c?

Ans 4:

Shashank Reddy from Gyan Ganga International School, Pune
Class : Class 5
C

Ans 5:

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

Ans 6: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is C.


Ans 7:

Ashwak from Cambridge, Jalandhar
Class : Class 9
The answer is C

Ans 8:

Goutham from lt, Chennai
Class : Class 4
I. This is so EZ.t can be c as N is on the top and S is down plus when the north recives cold it is hot in the south and when the south is cold it is hot in the north

Ans 9:

ibrahim akhil pathan from kaka's international school, pune
Class : Class 4
explain please

Ans 10:

SWARIT JAIN from DPS Greater Noida, GREATER NOIDA
Class : Class 9
C

Ans 11:

Vivaan from Rustomjee Cambridge International School and Junior College, Mumbai
Class : Class 6
C

Ans 12:

Pranav Verma from DPS Pal Road , Jodhpur
Class : Class 4
D is correct

Ans 13:

Soumyajit Das from Hariyana Vidya Mandir, NORTH 24 PARGANAS
Class : Class 7
please give explanation Admin.

Ans 14:

Shrinikethan S from Padma Seshadri Bala Bhavan Senior Secondary School, K. K. Nagar,, Chennai
Class : Class 5
how do you all know the correct answer is 'C' when everything seems correct.

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Supreet Birdi from Global Indian International School, Bangalore
Subject :NSO    Class : Class 5

Ans 1:

harry potter from Hogwarts school of witchcraft and wizardry , london
Class : Class 5
but read the question... you have to select the incorrect ans

Ans 2:

Rimi from TLISK, pune
Class : Class 9
its a

Ans 3:

Ashwak from Cambridge, Jalandhar
Class : Class 9
I think the answer is A

Ans 4:

Mathamagician from BGSNPS, Bengaluru
Class : Class 6
EASY. It is a). FOund it very quickly. I wonder why many of you put c)

Ans 5:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
The correct answer is a but i did it wrong... (i did ans C)

Ans 6:

anita from Manan Vidya Ranchi, Ranchi
Class : Class 4
D

Ans 7:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5

Ans 8:

Devasree from Presidium, Ghaziabad
Class : Class 10
Soumya raj is correct answer should be c as ball and socket joint is only found in legs and arms and it is definitely not found in the skull .

Ans 9:

Ashee Srivastava from APEEJAY SCHOOL NOIDA , NOIDA
Class : Class 7
But a is the answer .

Ans 10:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4

Ans 11:

Pratham Dave from GNS, Bangalore
Class : Class 7
All of them are incorrect so the answer is D

Ans 12:

Advaith from National Public School, HSR Layout , Bengaluru
Class : Class 8
The question is asking to select the incorrect question, but option C is correct and option A is wrong so A is the correct answer

Ans 13:

Syeda Safina Taj from Federal public school, Bengaluru
Class : Class 4
Answer a

Ans 14:

marika from VTS, Mumbai
Class : Class 4
cool question

Ans 15:

Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon
Class : Class 7
WTH?

Ans 16:

Ayushmaan from D, B
Class : Class 5
Nice question

Ans 17:

Prerona Chatterjee from Delhi Public School North Kolkata, Kolkata
Class : Class 5
actually the picture P is wrong . they want to express it as pivot joint.

Ans 18:

Smita De from Bishop Cotton Girls School, BANGALORE
Class : Class 6
correct answer is supposed to be C. But according to SOF it is A.

Ans 19:

Ashee Srivastava from APEEJAY SCHOOL NOIDA , NOIDA
Class : Class 7
I did it c but according to SOF, it is a.

Ans 20:

bharati nath from Springdale high school, Kalyani
Class : Class 6

Ans 21:

Rohan TR from Sri Aurobindo memorial school, Bangalore
Class : Class 6
Soumya raj is correct

Ans 22:

Goutham Ram from Lecole' Chempaka International, Trivandrum
Class : Class 5

Ans 23:

Yashasvika from Euro World School, Sri Ganganagar
Class : Class 5
the answer is a but i did it c

Ans 24:

Biju Pappachan from Rkc , Raipur
Class : Class 1
The correct ans is A.

Ans 25:

KONDURU TEJESH from Sri chaitanya international school, Bangalore
Class : Class 4
p is not pivot joint but a ball and socket joint but according to me c is the correct ans

Ans 26:

Ashwak from Cambridge, Jalandhar
Class : Class 9

Ans 27:

Rimi from TLISK, pune
Class : Class 9
OH mene to d kiya tab laga ki sab wrong the.oh my god now acinfusing yar

Ans 28:

Anantjit Chander from Apeejay School, Sector 15, Faridabad
Class : Class 10
Yes, it is true, we can compare the movement to the joint mentioned as "P" with that of a joystick. It is a ball-socket joint, and it is found in the shoulders and the hips.

Ans 29:

Preeti tanwar from DON BOSCO ACADEMY, Patna
Class : Class 9
c

Ans 30:

Riya from Bhavan Vidyalaya, Chandigarh
Class : Class 8
good question sligjhtly tricky

Ans 31:

Arav Gupta from Delhi Public School Gurgaon, Gurgaon
Class : Class 8
And the question said to find the incorrect option! So a.

Ans 32:

Praket Tejas from Delhi Public School Indira Nagar Lucknow, Lucknow
Class : Class 4
iojkbn

Ans 33:

Ashwak from Cambridge, Jalandhar
Class : Class 9
It's simple

Ans 34:

Pratham Gupta from P G Garogdia, Mumbai
Class : Class 5
Correct answer is C

Ans 35:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
SOF is wrong . The answer should be C as Ball and socket joint is only found in arms and legs . It cannot come in the skull . Smita De is also absolutely right .

Ans 36:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5
The correct answer is A) according to SOF

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Harini senthilkumar from Maharishi vidhya mandir, Chennai
Subject :NSO    Class : Class 5

Ans 1:

Shivam Dave from JAMNABAI NARSEE SCHOOL, Gandhinagar
Class : Class 7
It would be conducted on either 9th or 23rd November. Ask your school Olympiad Coordinator.

Ans 2:

Shivam Dave from JAMNABAI NARSEE SCHOOL, Gandhinagar
Class : Class 7
It would be conducted on either 9th or 23rd November. Ask your school Olympiad Coordinator.

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Achintya k j from KENDRIYA VIDYALAYA GOLE MARKET, NEW DELHI
Subject :NSO    Class : Class 7

Ans 1:

Anurag peddi from Niraj International School, Hyderabad
Class : Class 9
base turns yellow with methyl orange.

Ans 2:

Shaurya Veer from Army Public School ASC C and C , Bangalore
Class : Class 10
i agree@anurag

Ans 3:

Anurag peddi from Niraj International School, Hyderabad
Class : Class 9
I think the answer is C. If it contains H+ ions less than OH- ions, the substance is a base.

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John Calvin from vaels billabong, kottiwakkam
Subject :NSO    Class : Class 5

Ans 1:

Rishi from Deens Academy, BENGALURU
Class : Class 7
mo the film will pop so ans is d

Ans 2:

Vihaan malhotra from The shriram school, New delhi
Class : Class 5
C

Ans 3:

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

Ans 4:

AARAV AGRAWAL from BIRLA DIVYA JYOTI, SILIGURI
Class : Class 8
a b c d e f g h i j k l m n o p q r s t u v w x y z.......... Confusing .......... z y x w v u t s r q p o n m l k j i h g f e d c b a

Ans 5:

Srishti Verma from Basava International School, New delhi
Class : Class 5

Ans 6:

Durva Shah from SSRVM, Ahmedabad
Class : Class 6
Option DThe film of soapy water will burst as the water will get evaporated........

Ans 7:

Hari Govind from Delhi Public School Chandigarh , Chandigarh
Class : Class 6
d

Ans 8:

Sri Susrutha Chowdary Karnati from Vibgyor high , Bangalore
Class : Class 8
ANSWER IS D

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Shruti Rajshree from NPS Indiranagar, Bengaluru
Subject :NSO    Class : Class 4

Ans 1:

Shreeya Mangla from ASN Senior Secondary School, New Delhi
Class : Class 9

Ans 2:

Raghav from DPS Gurgaon, Gurgaon
Class : Class 5
A

Ans 3:

Harsh Sobti from the samhita academy, BLR
Class : Class 5
answer can be b

Ans 4:

TARA NAUTIYAL from CONVENT OF JESUS AND MARY, DEHRADUN
Class : Class 4
A is not a mirror image

Ans 5:

Jordan Cole from NCS Arakkonam, Arakkonam
Class : Class 3

Ans 6:

Harishchandra C from narayana e techno school, chennai
Class : Class 5
THEY CAN TELL THAT WHICH IS NOT MIRROR IMAGE OR MIRROR IMAGE

Ans 7:

Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon
Class : Class 7
A

Ans 8:

lavanya from bcm chd road, Ludhiana
Class : Class 5

Ans 9:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
Yes A is not a mirror image SOF change answer

Ans 10:

SRISANTH from Edify, Tirupathi
Class : Class 5
A is almost a symmetrical figure

Ans 11:

Adit Aggarwal from Vibgyor High, Bengaluru
Class : Class 5
A is not a mirror image. Requesting SOF to correct the same.

Ans 12:

Shreeya Mangla from ASN Senior Secondary School, New Delhi
Class : Class 9

Ans 13:

Jeevi Ran from THANGAM MOUNT litera zee school at AYOTHIYAPATTINAM , Salem
Class : Class 6
A

Ans 14:

Arnav Thombare from DAV Public School Thane, Thane
Class : Class 4

Ans 15:

Aryan Swain from Kendriya Vidyalaya, Barimul, Kendrapara
Class : Class 5
A is not a mirror image. @SOF Please change the answer.

Ans 16:

Jeet Anandani from Pawar public school, Mumbai
Class : Class 4
aa

Ans 17:

yajur from dps vk, delhi
Class : Class 5

Ans 18:

avighna wuthoo from The bishop school , PUNE
Class : Class 7

Ans 19:

Soorya Tej R from Delhi Public School, Hyderabad
Class : Class 6

Ans 20:

Samaira from Global Indian International School, Bangalore
Class : Class 8
I don’t understand how can d be the answer

Ans 21:

Ahaan Mittal from Primus Public School, Bengaluru
Class : Class 8
They were trying to show the mirror image but OptionA is not shown correctly as the mirror image. Hence the confusion. between A and D.

Ans 22:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
In A the mirror image of B is wrong and in D it is not a mirror image.In fact A and D both are not mirror images .Hence, the confusion between A and D

Ans 23:

Alisha from Delhi Public School , bopal, Ahemdabad
Class : Class 8
A IS NOT A MIRROR IMAGE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 24:

Jeet Anandani from Pawar public school, Mumbai
Class : Class 4
a

Ans 25:

Ava from trio, bangalore
Class : Class 2
C

Ans 26:

Sashriti Das from Delhi Public School Bangalore North, Bangalore
Class : Class 5
I Don't Understand?

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DIYA NOBY from VISWAJYOTHI CMI PUBLIC SCHOOL, ANGAMALY
Subject :NSO    Class : Class 5

Ans 1:

Aryan Sirohi from Mount LItera Zee School, Bangalore
Class : Class 8
Second class lever.

Ans 2:

Preeti tanwar from DON BOSCO ACADEMY, Patna
Class : Class 9
Second class lever

Ans 3:

Syeda Safina Taj from Federal public school, Bengaluru
Class : Class 4
Second lever

Ans 4:

Preeti tanwar from DON BOSCO ACADEMY, Patna
Class : Class 9
Second class lever

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