National Science Olympiad Forum By SOF Olympiad Trainer - Page 492
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Devansh trehan from Blue bells international school , New delhi
Subject :NSO    Class : Class 3

Ans 1:

Gurram Srisanthan from St Patricks Academy, Bengaluru
Class : Class 3
i think brain n spinal cord are parts of nervous system whereas kidneys n lungs are part of excretory system,through lungs we inhale o2 n exhale co2,kidneys excrete urines

Ans 2:

Sanskriti Ranjan from SETH ANANDRAM JAIPURIA SCHOOL, Ghaziabad
Class : Class 6
lungs and spinal cords are part of nervous system so lungs and kidney are part of excretory system(lungs dispose co2 from body)

Ans 3:

Eshan Ghosh from Don Dosco, Berhampore
Class : Class 3

Ans 4:

ANKIT from devin-national school, bangalore
Class : Class 5
the spi

Ans 5:

ANSHUL GAJJAR from PODAR INTERNATIONAL SCHOOL, AHMEDABAD
Class : Class 3
D

Ans 6:

saisavit from sri kumaran ps, bangalore
Class : Class 8
D because spinal cord helps brain to control the body.

Ans 7:

Advik Daga from Global Edge School, Hyderabad
Class : Class 4
It will be kidney because lungs give out carbon dioxide as waste.Heart is the wrong answer........

Ans 8:

Avyukta Saraswat from St Francis School , Greater noida west
Class : Class 3
I think both kidneys and hearth are correct. beacause lungs are in respiratory,curculatory and excretory system as they help us to brathe ,make pure blood and also the blood goes from hearth then lungs and then all parts. Plese tell how hearth is wrone.

Ans 9:

Avyukta Saraswat from St Francis School , Greater noida west
Class : Class 3
I think option a is also correct with option d as lungs are in curcularury system system too as the blood first goes to the lungs after the heath and then the body. Lungs also filter air and help us breathe so they are in excretory and resperatory system too. Plese tell how option a hearth is wrong .

Ans 10:

Twisha Khurana from First steps IB World school , Chandigarh
Class : Class 5
I think it should be heart not kidney

Ans 11:

Suhani Chauhan from Sai international School, bhubaneswar, Bhubaneswar
Class : Class 6
I thinks it should be heart. As lungs are connected with the heart not kidney.

Ans 12:

ANKIT from devin-national school, bangalore
Class : Class 5
spinal cord connects every organ to brain an

Ans 13:

Riddhima Vashist from Podar International School, Mumbai
Class : Class 3

Ans 14:

Riddhima Vashist from Podar International School, Mumbai
Class : Class 3
Heart is the correct answer

Ans 15:

Purva Kulkarni from Podar International School ICSE Kalyan, Dombivali east
Class : Class 8
i think heart is correct answer. please elaborate, how come kidney is right answer a

Ans 16:

Kanak goel from Ursuline senior secondary convent school, Greater Noida
Class : Class 6
Heart

Ans 17:

Ibrahim Aslam from uttam, Ghaziabad
Class : Class 5

Ans 18:

SIDDHARTH SOMANI from Vibgyor High, Mumbai
Class : Class 5
Answer is D because both lungs n kidney are in Exetery system

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Ujjwal Upadhyay from Navy Children school, Vasco
Subject :NSO    Class : Class 5

Ans 1:

Lohithakshith Pati from Olive international school , qatar
Class : Class 8
use your brain bro

Ans 2:

Dripto Chakraborty from Greenwood High Sajarpur, Bangalore
Class : Class 5
You can earn badges by studying hard in sof , like doing tests, previous year papers, mock tests, etc.

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samyak shwet from kidzee, Begusarai
Subject :NSO    Class : Class 8

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Pratyay Sarkar from South Point High School, Kolkata
Subject :NSO    Class : Class 7

Ans 1:

UTKARSH SAWARN from AIR FORCE SCHAOOL AMBALA CANTT, AMBALA CANTT
Class : Class 8
IN MY OPINION OPTION C IS THE CORRECT ANSWER

Ans 2:

Sanket Kulkarni from Euroschool, Pune
Class : Class 8
Please explain your answer. I am really confused.@UTKARSH SAWARN

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Pratyay Sarkar from South Point High School, Kolkata
Subject :NSO    Class : Class 7

Ans 1:

Vedang Shridhar Sasturkar from Vasant Valley School, New Delhi
Class : Class 7
I don't understand tbh

Ans 2:

kartick Somasundaram from san academy, chennai
Class : Class 1
@Bhagyesh You need to use your brain and do it with your hands. Simple. @Raavi no need of that big thingy

Ans 3:

PRIYANSHU DEB from New Green Field School, Saket, New Delhi
Class : Class 7

Ans 4:

kartick Somasundaram from san academy, chennai
Class : Class 1

Ans 5:

Raavi from DPS, Ranchi
Class : Class 8
@bhagyesh .As metal rod or electroscope is positively charged all the currents flown to the object will be positive and the leaves will repel each other

Ans 6:

Prisha Hemchandra Lokhande from NPS Whitefield, Bangalore, Bangalore
Class : Class 8

Ans 7:

priyanka from kendriya vidalaya kathmandu, JHAJJAR
Class : Class 8
option a

Ans 8:

priyanka from kendriya vidalaya kathmandu, JHAJJAR
Class : Class 8
option a

Ans 9:

PRIYANSHU DEB from New Green Field School, Saket, New Delhi
Class : Class 7
why not option c?

Ans 10:

sachinthite@rocketmail.com from Sinhghad Public School Korti, Pandharpur
Class : Class 4
how priyanka

Ans 11:

Arjun from Sri Kumaran Public School - ICSE, Bengaluru
Class : Class 8
This is wrong. The answer should be C, due to induction. The positive charges move to the bottom as they repel, while the negative particles should move to the top, as they are attracted to the positive particles in the bar.

Ans 12:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8
how to do it

Ans 13:

PRIYANSHU DEB from New Green Field School, Saket, New Delhi
Class : Class 7

Ans 14:

Bhim Maity from ASIAN INTERNATIONAL SCHOOL HOWRAH, HOWRAH
Class : Class 7

Ans 15:

kartick Somasundaram from san academy, chennai
Class : Class 1
@Bhagyesh You need to use your

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Pratyay Sarkar from South Point High School, Kolkata
Subject :NSO    Class : Class 7

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Gauri Singh from St Johns School Marhauli, Varanasi
Subject :NSO    Class : Class 6

Ans 1:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 9
Loudspeakers use electromagnets.So,the answer should be (B)

Ans 2:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 9

Ans 3:

Veda Dua from Delhi Public School, R. K. Puram, New Delhi
Class : Class 10
Loudspeakers use electromagnets, so the answer is option B

Ans 4:

Joe Bipin from National Public School Agra, Bangalore
Class : Class 10
loud speakers have both electromagnets and permanent magnets

Ans 5:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 9
Loudspeakers use electromagnets so it should be answer b

Ans 6:

Tamrashi Pani from National Public School, Bangalore
Class : Class 8
But all of them use permanent magnets...so D is correct

Ans 7:

Shreya Yegna Narayanan from psbb, chennai
Class : Class 6
Loud speakers use electromagnets as they dont need magnetic force when not in use so ans is B

Ans 8:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
Loudspeakers use electromagnets.

Ans 9:

Mridul Jain from Shishukunj International School Indore, Indore
Class : Class 9
The answer is B as loudspeakers use electromagnets and the magnetic field isn't there always .

Ans 10:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 10

Ans 11:

Smita De from Bishop Cotton Girls School, BANGALORE
Class : Class 6
answer is B so obvious

Ans 12:

Sharmi Chowdhury from G.D Birla Centre For Education , Kolkata
Class : Class 7
Don't loudspeakers use electromagnets?

Ans 13:

NISHTHA GUPTA from DPS R K Puram, newdelhi
Class : Class 10
answer will be b as loudspeakers use electromagents

Ans 14:

satwik patnaik from DPS Rourkela, Rourkela
Class : Class 7
answer should be b

Ans 15:

Aarush Mallya from EISB, BANGALORE
Class : Class 5
Loud speakers use permanent magnets

Ans 16:

Joe Bipin from National Public School Agra, Bangalore
Class : Class 10
they use both so the answer is d

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Gauri Singh from St Johns School Marhauli, Varanasi
Subject :NSO    Class : Class 6

Ans 1:

arjun from the bishops school camp , pune
Class : Class 8

Ans 2:

rocker harshil from TImpany senior secondary school, Visakhapatnam
Class : Class 6
as only the option (D) will be magnetic and the SOFT IRON will act as a keepers

Ans 3:

Syed Mukhtar Ahmed from Mayoor Private School, Abu Dhabi
Class : Class 6

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Agastya Tripathi from dps gurgaon, Gurgaon
Subject :NSO    Class : Class 5

Ans 1:

AREEN from BOLTON, HYDERABAD
Class : Class 6
Ans should be A because tuemeric powder is solid and solids are incompressible. Liquids are also incompressible but the some of the liquid has gone above the end of the piston, which is inside the syringe. Gases are compressible, so the piston easily moves.

Ans 2:

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

Ans 3:

Ujjwal Upadhyay from Navy Children school, Vasco
Class : Class 6
Well... I think the answer is B

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student from school, city
Subject :NSO    Class : Class 6

Ans 1:

NISHTHA GUPTA from DPS R K Puram, newdelhi
Class : Class 10
solution?

Ans 2:

Lakshmi from FPS, Bangalore
Class : Class 10
c is the answer

Ans 3:

Saikrishna Nandakumar from Shishya BEML Public School, BANGALORE
Class : Class 6
c

Ans 4:

BHAVYA from iswk, Oman
Class : Class 6
can I have an explanation please....... plz...plz...plz...

Ans 5:

Shreyas from Phoenix greens, Hyderabad
Class : Class 9

Ans 6:

Neil Mathew from National Public school, bengaluru
Class : Class 8
How is it C!?

Ans 7:

Anushka Srivastava from Cjm, Dehradun
Class : Class 7
its C acording to me

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