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SHAUNAK from St Xaviers School, HAZARIBAG
Subject :NSO    Class : Class 3

Ans 1:

Nirvi Pal from jasudben ML School, mumbai
Class : Class 5
it is a piece of cake

Ans 2:

Ridhika from St Xavier sr sec school, Bathinda
Class : Class 3
D

Ans 3:

Soumyajit Das from Hariyana Vidya Mandir, NORTH 24 PARGANAS
Class : Class 8
What a tricky question!

Ans 4:

Avinabha Hore from DPS south kolkata, Kolkata
Class : Class 5
It is very tricky question.

Ans 5:

Ashwak from Cambridge, Jalandhar
Class : Class 9
The correct answer is D

Ans 6:

saisavit from sri kumaran ps, bangalore
Class : Class 8
very tricky

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SHAUNAK from St Xaviers School, HAZARIBAG
Subject :NSO    Class : Class 3

Ans 1:

Shrihan Raul from GIIS SINGAPORE, Singapore
Class : Class 6

Ans 2:

Ashwak from Cambridge, Jalandhar
Class : Class 9
D

Ans 3:

Avighna Shastri from doha modern indian school, doha
Class : Class 2

Ans 4:

Aditri Dixit from TCIS, Bangalore
Class : Class 3

Ans 5:

Sarthak Shome from Harvest International, Bangalore
Class : Class 8

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Karangat house from Navy Children School, Payyannur
Subject :NSO    Class : Class 3

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Devansh trehan from Blue bells international school , New delhi
Subject :NSO    Class : Class 3

Ans 1:

Eshan Ghosh from Don Dosco, Berhampore
Class : Class 3

Ans 2:

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 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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 8:

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

Ans 9:

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 10:

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 11:

Ibrahim Aslam from uttam, Ghaziabad
Class : Class 5

Ans 12:

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 13:

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

Ans 14:

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 15:

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

Ans 16:

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 17:

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

Ans 18:

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

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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:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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

Ans 10:

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 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:

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 13:

kartick Somasundaram from san academy, chennai
Class : Class 1

Ans 14:

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

Ans 15:

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

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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:

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 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

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

Ans 15:

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

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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