National Science Olympiad Forum By SOF Olympiad Trainer - Page 551
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Ujjwal Upadhyay from Navy Children school, Vasco
Subject :NSO    Class : Class 5

Ans 1:

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.

Ans 2:

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

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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:

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

Ans 2:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

kartick Somasundaram from cps, chennai
Class : Class 3

Ans 6:

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

Ans 7:

kartick Somasundaram from cps, chennai
Class : Class 3
@Bhagyesh You need to use your brain and do it with your hands. Simple. @Raavi no need of that big thingy

Ans 8:

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

Ans 9:

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

Ans 10:

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

Ans 11:

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 12:

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

Ans 13:

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 14:

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

Ans 15:

kartick Somasundaram from cps, chennai
Class : Class 3
@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:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

Smita De from Bishop Cotton Girls School, BANGALORE
Class : Class 5
answer is B so obvious

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:

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

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

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 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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

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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:

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

Ans 2:

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 3:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

Shreyas from Phoenix greens, Hyderabad
Class : Class 9

Ans 5:

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

Ans 6:

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

Ans 7:

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

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Shreenath Rajesh Nair from J H A S V Surat, Surat
Subject :NSO    Class : Class 8

Ans 1:

Prisha Hemchandra Lokhande from NPS Whitefield, Bangalore, Bangalore
Class : Class 8
The answer is C because the ray would refract and be parallel to incident ray. also the emergent ray cant appear behind the incident ray

Ans 2:

Kaavyy boolani from Cambridge Court World School, Jaipur
Class : Class 6
It is Option C only, as when light travels from denser to rarer medium, it bends away from normal

Ans 3:

Ami Buch from DPS Gandhinagar, Gandhinagar
Class : Class 6
After checking the Snell's law, I found the answer to be C...But it says the correct answer is A

Ans 4:

Avyukth Radhakrishnan from TSRS, Gurgaon
Class : Class 10
It's A.When light travels from a denser to rarer medium,it bends TOWARDS the normal(Check normal in solution).Hence,answer is A.

Ans 5:

arav agrawal from kaanger valley academy, Raipur
Class : Class 9

Ans 6:

Pujan Rajyaguru from Allen, Ahemdabad
Class : Class 8
yes i think that opt C is correct

Ans 7:

Pranavi Nayakwadi from JSS Shri Manjunatheshwara Central School, Dharwad
Class : Class 8
I too think the correct ans is C rather than A

Ans 8:

Shreyam Tripathy from Ann Mary School, Dehradun
Class : Class 10
answer is C

Ans 9:

Madhav from Aggarsain Public School, Kurukshetra
Class : Class 9
correct answer is C

Ans 10:

arav agrawal from kaanger valley academy, Raipur
Class : Class 9

Ans 11:

Triguna from Kendriya Vidyalaya No.1 Salt Lake, Kolkata
Class : Class 8
Me too... I also think that the correct option will be C

Ans 12:

Abhinav from nesss, vadodara
Class : Class 10
I too think correct option is C

Ans 13:

Ved Pandhare from Lilavatibai Podar High School, Mumbai
Class : Class 8
correct answer is C as the ray would refract if its passing from a rarer to denser medium.

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