National Science Olympiad Forum By SOF Olympiad Trainer
  1. Home
  2. /  Forum

User Forum

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

Ans 1:

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

Ans 2:

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 3:

Raashid Sarfraz from IIPS, Riyadh
Class : Class 4

Ans 4:

Aarush Pandya from Inventure Academy, Bangalore
Class : Class 6
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 5:

Kriti Bhonsale from Delhi Public School, Bengaluru
Class : Class 4
C

Ans 6:

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

Ans 7:

Abhigyan Sinha from Podar International School, Powai, Mumbai, Mumbai
Class : Class 4
correct answer is C

Ans 8:

Ashwak from Cambridge International School, Saudi Al Dera
Class : Class 7
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 9: (Master Answer)

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

Ans 10:

Vibhor Mudgal from GBN School, Faridabad
Class : Class 4

Post Your Answer

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

Ans 1:

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

Ans 2:

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

Ans 3:

Advika Narkar from Vibgyor High Airoli, Navi Mumbai
Class : Class 4
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 4:

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 5:

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

Ans 6:

Advika Narkar from Vibgyor High Airoli, Navi Mumbai
Class : Class 4
ans is A as the order of gases will not change

Ans 7:

SAMRIDDHA PANDA from MONFORT SENIOR SECONDARY SCHOOL, BARUIPUR
Class : Class 5

Post Your Answer

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

Ans 1:

Ashmi Narkar from VIBGYOR HIGH , Airoli, Navi Mumbai, NAVI MUMBAI
Class : Class 5
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 2:

Ashmi Narkar from VIBGYOR HIGH , Airoli, Navi Mumbai, NAVI MUMBAI
Class : Class 5
ANS should be a

Ans 3:

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

Ans 4:

TanishaNath from Clarence Public school Bangalore, Bangalore
Class : Class 5
why

Ans 5:

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

Ans 6:

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

Ans 7:

Ashmi Narkar from VIBGYOR HIGH , Airoli, Navi Mumbai, NAVI MUMBAI
Class : Class 5

Ans 8:

Shivani Shivu Singh from Pawar Public School Chandivili , Mumbai
Class : Class 3

Ans 9:

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

Ans 10:

Shivani Shivu Singh from Pawar Public School Chandivili , Mumbai
Class : Class 3

Ans 11:

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

Ans 12:

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

Ans 13:

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

Post Your Answer

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

Ans 1:

Vivaan from Thakur public school, Mumbai
Class : Class 5
C

Ans 2:

Pratibha from Narayana, Mumbai
Class : Class 4

Ans 3:

Shreshta from Presidium, Ghaziabad
Class : Class 5
DDDDDDDDDDDDDD

Ans 4:

Abhigyan Sinha from Podar International School, Powai, Mumbai, Mumbai
Class : Class 4
correct answer is C

Ans 5:

somesh from cps katol road, nagpur
Class : Class 4
d

Ans 6:

SWARIT JAIN from TSMS NOIDA, GREATER NOIDA
Class : Class 5
C

Ans 7:

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

Ans 8:

Ashwak from Cambridge International School, Saudi Al Dera
Class : Class 7
The answer is C

Ans 9: (Master Answer)

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

Ans 10:

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.

Post Your Answer

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

Ans 1:

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 2:

Syeda Safina Taj from Federal public school, Bengaluru
Class : Class 2
Answer a

Ans 3:

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

Ans 4:

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 5:

Monika Bhattacharya from the lexicon international school kalyaninagar, pune
Class : Class 5
its a

Ans 6:

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

Ans 7:

Preeti tanwar from DON BOSCO ACADEMY, Patna
Class : Class 6
c

Ans 8:

Advaith from National Public School, HSR Layout , Bengaluru
Class : Class 5
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 9:

marika from VTS, Mumbai
Class : Class 4
cool question

Ans 10:

Monika Bhattacharya from the lexicon international school kalyaninagar, pune
Class : Class 5
OH mene to d kiya tab laga ki sab wrong the.oh my god now acinfusing yar

Ans 11:

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

Ans 12:

Ashwak from Cambridge International School, Saudi Al Dera
Class : Class 7

Ans 13:

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

Ans 14:

septic pooper from dps gurgaon, Gurgaon
Class : Class 7

Ans 15:

Anantjit Chander from Apeejay School, Sector 14, Faridabad, Faridabad
Class : Class 5
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 16:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 6
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 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:

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

Ans 19:

Devasree from Presidium, Ghaziabad
Class : Class 5
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 20:

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

Ans 21:

Ashwak from Cambridge International School, Saudi Al Dera
Class : Class 7
I think the answer is A

Ans 22:

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

Ans 23:

Ashwak from Cambridge International School, Saudi Al Dera
Class : Class 7
It's simple

Ans 24:

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 25:

Pratham Dave from GNS, Bangalore
Class : Class 6
All of them are incorrect so the answer is D

Ans 26:

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

Ans 27:

Riya from Bhavan Vidyalaya, Chandigarh
Class : Class 4
good question sligjhtly tricky

Ans 28:

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

Ans 29:

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 30:

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

Ans 31:

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

Post Your Answer

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.

Post Your Answer

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:

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.

Post Your Answer

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

Ans 1:

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

Ans 2:

Sri Susrutha Chowdary Karnati from Vibgyor, Bangalore
Class : Class 5
ANSWER IS D

Ans 3:

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

Ans 4:

Mahadevan from KV Rubber Board Kottayam, Kottayam
Class : Class 5
answer is C

Ans 5:

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

Ans 6:

AARAV AGRAWAL from BIRLA DIVYA JYOTI, SILIGURI
Class : Class 5
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

Post Your Answer

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

Ans 1:

Shreeya Mangla from ASN International School, New Delhi
Class : Class 4

Ans 2:

atharv from bluebells international, delhi
Class : Class 4

Ans 3:

Shreeya Mangla from ASN International School, New Delhi
Class : Class 4

Ans 4:

lavanya from bcm chd road, Ludhiana
Class : Class 5

Ans 5:

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

Ans 6:

Ahaan Mittal from Primus Public School, Bengaluru
Class : Class 6
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 7:

Alisha from Delhi Public School kolar road, Bhopal
Class : Class 4
A IS NOT A MIRROR IMAGE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 8:

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

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

Jordan Cole from NCS Arakkonam, Arakkonam
Class : Class 3

Ans 13:

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

Ans 14: