National Science Olympiad Forum By SOF Olympiad Trainer - Page 519
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Antara Mazumdar from Navy Children School, Mumbai
Subject :NSO    Class : Class 7

Ans 1:

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

Ans 2:

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

Ans 3:

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 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:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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 7:

Kashika Goel from DPS Noida, Noida
Class : Class 7

Ans 8:

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

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

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:

Mohi from Vibgyor, Bangalore
Class : Class 6
B

Ans 13:

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

Ans 14:

Hamsini from yagappa international school, Thanjavur
Class : Class 6
c

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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:

Samarth Sabari from GIIS, Singapore
Class : Class 9
B

Ans 3:

Ashwak from Cambridge, Jalandhar
Class : Class 9
B

Ans 4:

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 5:

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

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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Priyam Bhattacharya from cambridge court high school, jaipur
Subject :NSO    Class : Class 5

Ans 1:

DIPTANGSU PARBAT from SOUTH POINT HIGH SCHOOL, Kolkata
Class : Class 7

Ans 2:

Kanishk Mukherjee from BDM International, Kolkata
Class : Class 6

Ans 3:

SATYA ande from TM Patel International School , Surat
Class : Class 5

Ans 4:

Aarav Jain from Lodha World School, Thane, Thane
Class : Class 6

Ans 5:

Mithul Pranav KB from Narayana Olympiad School Madipakkam, Chennai
Class : Class 5

Ans 6:

Revant Singh from Delhi Public School Raipur, Raipur
Class : Class 5
ans 1 i have got 5 times in level 2 and 9 times in level 1

Ans 7:

Swarit from Indian School Wadi kabir, Muscat
Class : Class 6
Of the three mediums, sound waves travel the slowest through gases, faster through liquids, and fastest through solids. Sound waves need a medium to pass through. Liquid molecules are not packed as tightly as solids, and gases are very loosely packed. The spacing of the molecules enables sound to travel much faster through a solid than a liquid or a gas. Sound travels about four times faster and farther in water than it does in air. That means the right answer is Option D.i am the smartest guy in sofi have got once international rank 1in level 2

Ans 8:

Aaditya Malhotra from Isaac Newton Global School, Mumbai
Class : Class 3

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Harsh Sobti from the samhita academy, BLR
Subject :NSO    Class : Class 4

Ans 1:

Harsh Sobti from the samhita academy, BLR
Class : Class 5
the answer is a a a a a a a a!!!!!!!!!!!!

Ans 2:

Priya Kulkarni from Podar international school , Ratnagiri
Class : Class 4
B

Ans 3:

bswarajya from Mount Litera Zee School, Bengaluru
Class : Class 5
B

Ans 4:

Vidhuran S from Euro School Whitefield, Bangalore
Class : Class 4
a

Ans 5:

IAMLOST from ABC, Pune
Class : Class 8
option b is the correct answer

Ans 6:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Harsh , the answer is B not A

Ans 7:

Shreyansh Saha from Dps Megacity, Kolkata
Class : Class 6
The correct Option is b

Ans 8:

vighneshwar from study hall, Lucknow
Class : Class 5
B

Ans 9:

somesh from Centre point katol road, Nagpur
Class : Class 6
B

Ans 10:

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

Ans 11:

Tavish Singh from Sanskriti School, Hyderabad
Class : Class 4
anser ccccccccccccccccccccccccccccccccccccccccccccccccccccccc

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Harsh Sobti from the samhita academy, BLR
Subject :NSO    Class : Class 4

Ans 1:

Subham Halder from Av academy, Kolkata
Class : Class 4

Ans 2:

shreyash rawat from podar international school, pune
Class : Class 8
the answer is[ A]

Ans 3:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5

Ans 4:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5
snowhite corrrect

Ans 5:

UMANG from spring dale college, Lucknow
Class : Class 7
The answer is option A

Ans 6:

Shreyansh Saha from Dps Megacity, Kolkata
Class : Class 6
Option c

Ans 7:

SS from meridian, hyderabad
Class : Class 5
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Ans 8:

Pragnay Priyadarshi from Quantum Leap School, HYDERABAD
Class : Class 7
c is the right option

Ans 9:

vighneshwar from study hall, Lucknow
Class : Class 5
C

Ans 10:

Riddhiman Bose from Don Bosco School, Kolkata
Class : Class 5

Ans 11:

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

Ans 12:

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

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

Ans 1:

Kavya agrawal from OP Jindal school, Raigarh
Class : Class 3

Ans 2:

k tagore from montessori school, KURNOOL
Class : Class 3

Ans 3:

Saathvik Sriram from euroschool whitefield, Bangalore
Class : Class 5
question is incomplete

Ans 4:

Kavya agrawal from OP Jindal school, Raigarh
Class : Class 3
Question in complete

Ans 5:

k tagore from montessori school, KURNOOL
Class : Class 3
question incomplete

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Swastik from st marys school, new delhi
Subject :NSO    Class : Class 5

Ans 1:

Anusha from LBS School , Kota
Class : Class 10

Ans 2:

Priyam Bhattacharya from cambridge court high school, jaipur
Class : Class 6
yes you are right

Ans 3:

Anusha from LBS School , Kota
Class : Class 10

Ans 4:

Riya from Bhavan Vidyalaya, Chandigarh
Class : Class 8
Q should be water salt and P should be pure water

Ans 5:

Kaavyy boolani from Cambridge Court World School, Jaipur
Class : Class 6
p should be pure water and q should be impure water so kindly correct the options

Ans 6:

Anvi Ranade from ,
Class : Class 1
Yes. Even I think that sof here has made a mistake . P and Q should be interchanged . I am reporting this as an error

Ans 7:

P A Reyyansh from Ann Mary School, Dehradun
Class : Class 10
dumb SOF

Ans 8:

Kaavyy boolani from Cambridge Court World School, Jaipur
Class : Class 6
correct P and Q in the given picture

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