National Science Olympiad Forum By SOF Olympiad Trainer - Page 492
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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:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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 10:

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 11:

kartick Somasundaram from san academy, chennai
Class : Class 1

Ans 12:

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

Ans 13:

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

Ans 14:

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

Ans 15:

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.

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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:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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

Ans 10:

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

Ans 11:

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 12:

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

Ans 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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

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

Ans 1:

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

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:

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

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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:

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

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:

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

Ans 2:

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

Ans 3:

Shreyas from Phoenix greens, Hyderabad
Class : Class 9

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

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

Ans 1:

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 2:

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

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:

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

Ans 5:

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 6:

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.

Ans 7:

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

Ans 8:

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

Ans 9:

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 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

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

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Shuvangi Das from Vivekananda mission school, haldia
Subject :NSO    Class : Class 4

Ans 1:

Aarav sugla from Niraj International School , Secunderabad
Class : Class 5

Ans 2:

Adarsh Kishor from Manav Rachna International Sector46, Gurgaon
Class : Class 4
I GOT 40/40 IN THIS QES. PAPER

Ans 3:

Sushree snehasikta behera from Mother's public school , Bhubaneswar
Class : Class 2
Sushree Snehasikta Bhera from Mother's Public school, Odishaclass 4Answer is c as cockroach has three stages in its life cycle and also the young one of the cockroach resembles the adult. The housefly also has three stages in its life cycle and also does not resemble its adult.

Ans 4:

AVANTIKA V from Amrita Vidyalayam Puducherry , Puducherry
Class : Class 4
Ans: C

Ans 5:

AAYANSH from SMT.L.B.JOSHI ENGLISH HIGH SCHOOL, Thane
Class : Class 4
Aayansh from mundamarai

Ans 6:

Aadya Kawale from Podar International ICSE , Dombivli East
Class : Class 4
Shuchi: P is an organism which has three stages in its life cycle. The young one is very similar to its parent.Ritu: Q is an organism which has four stages in its life cycle. The young one is very different from its parent.Now, let’s see which of the following options gives the right identities of Organisms P and Q:

Ans 7:

Sanjeev Kumar Singh from S N B P INTERNATIONAL SCHOOL PUNE, RAHATANI
Class : Class 4
c

Ans 8:

Ananya Singh from Chrysalis High School, Bengaluru
Class : Class 4

Ans 9:

Sanjeev Kumar Singh from S N B P INTERNATIONAL SCHOOL PUNE, RAHATANI
Class : Class 4

Ans 10:

AAGNEY GOYAL from VENKATESHWAR INTERNATIONAL SCHOOL, Delhi
Class : Class 4

Ans 11:

Gunnit Kant from DPS, Nerul, Navi Mumbai
Class : Class 5
C

Ans 12:

Avigyan Gaurab from DPS Numaligarh, Golaghat
Class : Class 5
tg4tg

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Debarpan Das from Delhi Public School , Durgapur
Subject :NSO    Class : Class 4

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

Ans 1:

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

Ans 2:

Arnav Basu from faps, Bengaluru
Class : Class 6
b

Ans 3:

Kashika Goel from DPS Noida, Noida
Class : Class 7

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