National Science Olympiad Forum By SOF Olympiad Trainer - Page 484
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Drashti from Global Indian International School, Noida
Subject :NSO    Class : Class 7

Ans 1:

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

Ans 2:

Ayansh Verma from National Public School ITPL, Bangalore
Class : Class 8

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ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur
Subject :NSO    Class : Class 4

Ans 1:

Payal Porwal from St John gola, Gola
Class : Class 6
C

Ans 2:

Payal Porwal from St John gola, Gola
Class : Class 6
C

Ans 3:

ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur
Class : Class 9
A IS THE ANSWER

Ans 4:

Overtaker from Blore, Blore
Class : Class 4
A

Ans 5:

NAMISH AGRAWAL from KV calicut, calicut
Class : Class 4
why it is A when a ice melts it gets hot but the water stays cool

Ans 6:

sauradeep from j v m Shyamali , ranchi
Class : Class 10
C

Ans 7:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5
answer is a because when the ice melts it becomes warmer and changes into liqiud

Ans 8:

Overtaker from Blore, Blore
Class : Class 4
A

Ans 9:

Kanav Dhingra from DPS sec45, Gurgaon
Class : Class 10
option A

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Ashwak from Cambridge, Jalandhar
Subject :NSO    Class : Class 3

Ans 1:

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

Ans 2:

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

Ans 3:

Iraj Singh from DPS Megacity, Kolkata
Class : Class 9
The correct answer is A only.

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MAHESH PRASAD MC from Silveroaks, Hyderabad
Subject :NSO    Class : Class 8

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tamojit das from techno India Group Public School , Chinsura
Subject :NSO    Class : Class 8

Ans 1:

Hprakash09 from Billabong high Bhopal, Bhopal
Class : Class 7
I'm not sure what the answer is in this one, as the correct answer and the solution are mismatched.

Ans 2:

Gaurish Singla from DPS School Sector 19, Faridabad
Class : Class 8

Ans 3:

Akshara from NPS, Bengaluru
Class : Class 8
It should be A...

Ans 4:

S V Harini from Vailankanni public school , Krishnagiri
Class : Class 8

Ans 5:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 9

Ans 6:

Student from School, City
Class : Class 8
The *solution* and the *option* mismatch.

Ans 7:

Ayush Gorain from Sarala Birla Public School, Ranchi
Class : Class 8
According to Faraday's right hand rule, electricity flowing from point A to B generates a magnetic field around the wire moving from right to left (above the wire), and left to right (below the wire). Due to the compass being above the wire (according to the question), the compass needle must be influenced by the magnetic field, such that it points towards the right; i.e. the needle points in a direction from left to right. Thus, I opine that option (A) is the correct answer, not option (D). As there is an electric current, there must be a magnetic field, and thus there must be a deflection in the compass, which excludes option (D) entirely.

Ans 8:

Ayush Chauhan from Modern Public School, Bhiwadi
Class : Class 9

Ans 9:

Pranav from JSS Public School, Bengaluru
Class : Class 10
The answer is Option A

Ans 10:

Karthik Rao Varam from Bala Vidya Mandir, Chennai
Class : Class 10

Ans 11:

Nilanjana De from Delhi Public School North, Bengaluru
Class : Class 8
The solution says that the answer is supposed to be d but according to the explanation given the answer seems to be a. Please explain.

Ans 12:

aditya arora from Heritage Experiential Learning School, gurugram
Class : Class 8
should be a

Ans 13:

Dhanya Krishnaji from ISG, Muscat
Class : Class 8
It’s A . The question uses Maxwell’s right thumb rule.

Ans 14:

Sumedha Mishra from xyz, School, Pune
Class : Class 8

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Antara Mazumdar from Navy Children School, Mumbai
Subject :NSO    Class : Class 7

Ans 1:

Spandan Pradeep Pathare from Takshila school , Ahmednagar
Class : Class 8
Answer is option a as decomposition of dead matter of plant and animal by animals which gives nutrients to plants

Ans 2:

Jai kumar Bohara from Dps, Udaipur
Class : Class 9
this question did not come in the question paper,when i was solving

Ans 3:

rachith from null, null
Class : Class 7
this q didnt come

Ans 4:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
this question did not come in the question paper,when i was solving

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JANANI DINESH from CHINMAYA VIDYALAYA VIRUGAMBAKKAM, CHENNAI
Subject :NSO    Class : Class 3

Ans 1:

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

Ans 2:

Adya Shree from Shishya BEML Public School, Bangalore
Class : Class 3

Ans 3:

Sourish Mahakul from Delhi Public School Electronic City, Bengaluru
Class : Class 8
answer is c

Ans 4:

Mohi from Vibgyor, Bangalore
Class : Class 6
B

Ans 5:

Anagh Agrawal from Billabong high, JABALPUR
Class : Class 3
D

Ans 6:

Hamsini from yagappa international school, Thanjavur
Class : Class 5
c

Ans 7:

Kian Gracias from BOMBAY SCOTTISH SCHOOL, MUMBAI
Class : Class 4
nice question

Ans 8:

Shruti from ,
Class : Class 1
answer is c but it is saying b which is wrong

Ans 9:

Yatindra G from SBOA, Chennai
Class : Class 4
answers to all the questions:::: 1 : B 2: B 3:A 4:D 5:B

Ans 10:

Siddhant from Gundecha Education Society, Mumbai
Class : Class 3
D - Because increase in plant also increases population of Caterpiler and Grasshopper, and decrease in snake may constant Bulbul population if plant did not increases.

Ans 11:

Kashika Goel from DPS Noida, Noida
Class : Class 7
B first look which animals are connected to Bulbul with an arrow find their population then find population of other animals answer - B

Ans 12:

Kashika Goel from DPS Noida, Noida
Class : Class 7

Ans 13:

Aarvi Gosai from The New Tulip International School, ahemdabad
Class : Class 4
Wrong

Ans 14:

anu from The Amaatra Academy, Bengaluru
Class : Class 5
class: 3 this doesent make sense

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Ashwak from Cambridge, Jalandhar
Subject :NSO    Class : Class 5

Ans 1:

Divyanshi from United international School, Bangalore
Class : Class 6
I agree with Ira not with Arnav because pulley does not lessen the effort.

Ans 2:

Ira Jamsandekar from Shantiniketan, KOLHAPUR
Class : Class 10
Single pulley does not provide any mechanical advantage, it only changes the direction of force while an inclined plane provides mechanical advantage. This means the efforts required to life the same amount of load on an inclined plane is lesser than that by a single pulley. (Pulley provides mechanical advantage only if we use more than one pulley).Lesser the inclination more is mechanical advantage and lesser the effort. That means the correct answer should be 'D'

Ans 3:

Ashwak from Cambridge, Jalandhar
Class : Class 9
B

Ans 4:

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

Ans 5:

Samarth Sabari from GIIS, Singapore
Class : Class 9
B

Ans 6:

Arnav Agrawal from Emerald hieghts international school , Indore
Class : Class 5
B because if we use a rope to pull it will take a lot of effort, if we take a small or large inclined plane it will also take more effort because the load will slip down but in pulley we have to only pull the rope

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Ashwak from Cambridge, Jalandhar
Subject :NSO    Class : Class 5

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Aaryan from New horizons public school , Mumbai
Subject :NSO    Class : Class 8

Ans 1:

Nilanjana De from Delhi Public School North, Bengaluru
Class : Class 8
The answer is option c

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