National Science Olympiad Forum By SOF Olympiad Trainer - Page 683
  1. Home
  2. /  Forum

User Forum

Ask Your Question
M.MEYYAPPAN from DPS, Bhilai
Subject :NSO    Class : Class 8

Ans 1:

Arnav Diwan from F.A.I.P.S Kuwait, Kuwait
Class : Class 10
it is A as fertilizers are soluble in water. You might have heard that fertilizers flow into the river and cause eutrophication it flows into river because it is soluble in water

Ans 2:

aditya arora from Heritage Experiential Learning School, gurugram
Class : Class 8
A

Ans 3:

kd from st Jude's academy , sonipay
Class : Class 8
A

Ans 4: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is A.

Ans 5:

SpaceXX from indian school sohar, Muscat
Class : Class 9
The correct answer is B because manure is soluble in water but it is absorbed very slowly

Ans 6:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

Post Your Answer

jeeva from Kendriya Vidyalaya Kottayam, Kottayam
Subject :NSO    Class : Class 8

Post Your Answer

archana from carmel, nahan
Subject :NSO    Class : Class 3

Ans 1:

Sagnik Roy from Nava Nalanda Santiniketan Shakha, Bolpur
Class : Class 8
D

Ans 2:

Arrunabh from Delhi public school, Indore
Class : Class 3
i m not getting the answer

Post Your Answer

HARSHAL KUTE from cambridge school buldhana, Buldhana
Subject :NSO    Class : Class 6

Ans 1:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 2:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 3:

Aarush Laddha from NCFE, bengaluru
Class : Class 6
It should be T/21 only as T is the total time and no of times it passes Y is 21.Therefore the answer is T/21

Ans 4:

Mayank Mili from Delhi Public School, Golaghat
Class : Class 9

Ans 5:

Devabhrith from Delhi Public School Electronic City Bangalore, Bengaluru
Class : Class 8
Hi The Answer is T/10Sub To my YT:SkyPeRtan Wolf

Ans 6:

Jaidev Chowdhary from Shamrock International School, VIJAYAWADA
Class : Class 8

Ans 7:

DEEPTANGSHU DATTAGUPTA from DPS South Bangalore, BANGALORE
Class : Class 8
Here, in this example, the pendulum passes through y 21 times. So, it will do 10 complete oscillations and 1 half which is basically touching y. Therefore, the time period of the pendulum is T/10.

Ans 8:

Joe from St.Vincent pallotti, Bangalore
Class : Class 6

Ans 9:

tanmay chaudhry from BAL BHAVAN PUBLIC SCHOOL, New Delhi
Class : Class 4
yes I also agree with you

Ans 10:

pranavramesh from sri chaitanya techno school, Chennai
Class : Class 6
it should be t/21

Ans 11:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 12:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Yes it should be t/10 as the pendulum will pass through point y twice in its one revolution...... so the the time period should be t/10

Ans 13:

Yashraj Namdev Deshmukh from Sahyadri English School, Loha, Nanded
Class : Class 7
hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeelllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllloooooooooooooooooooooooooooooooooooooooooooooo

Ans 14:

Sharmi Chowdhury from G.D Birla Centre For Education , Kolkata
Class : Class 7
I agree with you

Ans 15:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
smsmsmsmsmmmsmsmsmsmsmsmsmsmsmfjjjjjjjjjjfjjfjfjfjfjfffffffffffffffyhhhhhhhhhhhhhhhhhhhhhhhhhhhhyhhhhhhhhhhyyyyyyyyyyyyyyyyujjjjjjjjjjjjjjjjikkkkkkkkkkkkkkkkkkkkkkkloooooooooooooooyhhhhhhhhhhhhhhhhbggggggggggggggghndcccccccccccccccccccchndcccccccccccccccccccccccccccedhyncccccccccccccccccccccccccccccccccccccccccccccccccccccchynedcccccccccccccccccccccccccchdenyccccccccccccedyhncccccccccccccccccccccccyyyyyyyyyyyyyyyyyyyyyyyyyyyyyydheycnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn

Ans 16:

Anika Saha from New Town School, KOLKATA
Class : Class 6
throughout the time period or the 21 swings the pendulum will pass through the point Y 21 times. so the answer is B(t/21)

Ans 17:

Kashvi Rawat from Gear Innovative International School, Bengaluru
Class : Class 3
The answer is right - it should be T/10

Post Your Answer

HARSHAL KUTE from cambridge school buldhana, Buldhana
Subject :NSO    Class : Class 6

Ans 1:

Agasthya S Ramkumar from Oakridge Internatioal School, Hyderabad
Class : Class 7
easy

Ans 2:

Anamkhan Mulla from Navrachna Sama, Vadodara
Class : Class 7
easyyyyyyyyy

Ans 3:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
The answer can be B and D both.

Ans 4:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Answer is B because to turn Water vapour into ice you need Deposition but water vapour cannot be deposited that is why you first need to turn the water vapour to water by condensation and then to convert water to ice you need freezing . Hence answer B is correct

Ans 5:

Aarav Chopra from Springdales School, New Delhi
Class : Class 7
it is a direct change, so it does have to turn into liquid state

Ans 6:

Aarav Chopra from Springdales School, New Delhi
Class : Class 7
ya

Ans 7:

Mayank Das from Army Public School Bolaram, Hyderabad
Class : Class 2

Ans 8:

Mayank Das from Army Public School Bolaram, Hyderabad
Class : Class 2

Ans 9:

KEERTHANA SHIBU from INDIAN SCHOOL GHOUBRA, Oman
Class : Class 7
NA

Ans 10:

Tanmay 2009 from MVN Aravali Hills, Faridabad
Class : Class 6
The answer is not B

Ans 11:

Aarav Chopra from Springdales School, New Delhi
Class : Class 7
same

Ans 12:

Agasthya S Ramkumar from Oakridge Internatioal School, Hyderabad
Class : Class 7
Guys you are wrong process name is deposition but you need to cool it to water then freeze it

Ans 13:

ADRIJA BANERJEE from KANAURIA GANGABAUX BHARTIYA VIDYA BHAVAN, KOLKATA
Class : Class 6
I do agree with Bhabani prasad

Ans 14:

HARSHAL KUTE from cambridge school buldhana, Buldhana
Class : Class 6
How in processes v condensation came?

Ans 15:

RICHA BORAH from K V ANNA NAGAR, CHENNAI
Class : Class 7
I also agree with all of you . That's just impossible, I guess.

Ans 16:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
I ALSO AGREE WITH YOU ALL

Ans 17:

Bhabani Prasad from Narayan School, Kolkata
Class : Class 6
We can express process v as deposition and how did condensation and freezing get involved

Ans 18:

malhar thorve from city internqtional school, satara road, pune
Class : Class 7

Ans 19:

Sai Srivardhan from Maharishi Vidya Mandir Chetpet, Chennai
Class : Class 9
In process v, actually sublimation takes place

Ans 20:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai
Class : Class 6
gas to solid is deposition and opposite is sublimation ans wrong

Ans 21:

Rasha Ranjan from DPS NOIDA , Vaishali
Class : Class 6

Post Your Answer

Pranat from LVIS, Noida
Subject :NSO    Class : Class 5

Ans 1:

Shivangi from St. Michael's High School, Patna
Class : Class 5
The answer is C

Ans 2:

Adeeth Baasu from Greenwood High, Bangalore
Class : Class 8
The answer is C

Ans 3:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
The correct ans is option C because electrostatic force is a non contact force which is similar to magnetic force and the comb is like a magnet and tin pieces of paper are like the metal here (So the comb will attract the tiny pieces of paper).

Ans 4:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
C

Ans 5:

Lakshana from SBOA School and Junior College, Chennai
Class : Class 6
it can also be said as static electricity

Ans 6:

Priyanshi Dubey from Ryan International school kandvali, Mumbai
Class : Class 7

Ans 7:

Vaibhav Elisetti from sri chaitanya techno school Nallagandla, Hyderabad
Class : Class 7
yup

Ans 8:

Tanmay kaushal from ICSE, Mumbai
Class : Class 5
Class :C

Ans 9:

aadav sagar from indian school al ghubrah , muscat
Class : Class 6
6536e6w33346si7s7474r6ssxfge65eueskibidyohio fanomtax rizzler

Ans 10:

Pratham Dave from GNS, Bangalore
Class : Class 7
I prefer option C

Post Your Answer

Vyom from St KABIR , Ahmedabad
Subject :NSO    Class : Class 5

Ans 1:

Gautam from Surya the Global School, Hyderabad
Class : Class 7
IDIOTS just listen to them or maybe they are wrong

Ans 2:

Anil sinha from DPS, Chandigarh
Class : Class 4
If this animal really existed it would have to be a monster that would eat us

Ans 3:

shaun joel dasari from subs, chennai
Class : Class 4
how can we tell what group is that animal if that doesn't exist

Ans 4:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
If the animal really existed it would have belonged to the same group as cow.

Ans 5:

Anil sinha from DPS, Chandigarh
Class : Class 4

Ans 6:

NEEV SINGH from VISHWA BHARATI PUBLIC SCHOOL, Noida
Class : Class 8
Is cow have 6 legs and 1 eye on its forehead

Ans 7:

Fareeha siddiqua from Janki Devi public school , Mumbai
Class : Class 5
It can't be D as they do not have six legs. no option is correct. I will report error for it is NOOT D

Ans 8:

Shiven Bhakat from ,
Class :
Ans is D

Ans 9:

Adrito gayen from VMS, Kolkata
Class : Class 9
The answer is D. Hair on skin and breast feeding the young ones are characteristic of mammals such as cow. So, if really existed, this animal would have been placed with cow.

Ans 10:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5
Yes but in the question it said that the animal was imanginative can't believe what type of an animal it was.

Ans 11:

Saipriya from Sankara, Chennai
Class : Class 9
All report an error they give all wrong only

Ans 12:

Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon
Class : Class 7
Idiots, the monster fed milk to its young, a feature seen only in Mammals

Ans 13:

VISHNU from NARAYANA OLYMPIAD GOPALAPURAM, chennai
Class : Class 5
I can say that they have fur but they don't have 6 legs and 1 eye on the forehead

Ans 14:

Anil sinha from DPS, Chandigarh
Class : Class 4

Ans 15:

adhiraj from Gundecha Education Academy, Mumbai
Class : Class 5
Firstly , mammals do not have three eyes, secondly which mammal has six legs ???????????

Ans 16:

arulmozhi ramesh from Kv, Coimbatore
Class : Class 9

Ans 17:

Aniruddh Singh from Premia Academy , Hydrabad
Class : Class 7
This is impossible because a cow has four legs not 6 legs and also it has two eyes not one eye and those two eyes are not on the forehead

Ans 18:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
forehead? hahahahahahahahah

Ans 19:

Shweta Garg from Vibgyor high, Vadodara
Class : Class 8
Mammals do not have 3 eyes

Ans 20:

AARAV AGRAWAL from BIRLA DIVYA JYOTI, SILIGURI
Class : Class 8
this question makes no sense . 6 legs-can be an insect , eye on his forehead???

Ans 21:

Dushyant Singh from Shri Ram Centennial School, Indore
Class : Class 6
The answer is D.

Ans 22:

Devdarsh hero from HOLY GRACE, Mala
Class : Class 6
mammals do not have 6 legs and has more han 1 eye!

Ans 23:

Riddhik Bose from Vibgyor High, Airoli, Mumbai
Class : Class 9
ydejkcdhbjxdjkdajkdsjhdasjhdajhsadhjdaj

Ans 24:

Shweta Garg from Vibgyor high, Vadodara
Class : Class 8
Mammals do not have 3 eyes

Ans 25:

Shivangi from St. Michael's High School, Patna
Class : Class 5
The answer is D

Ans 26:

SANVI ROHILLA from The little shri, Rohtak
Class : Class 5
Ans D ( Cow)

Ans 27:

Aniruddh Singh from Premia Academy , Hydrabad
Class : Class 7
This is impossible cow only as four legs and two eyes and those two are not on the forehead

Ans 28:

Jasmit kaur from Sun Valley International School, Vashundra
Class : Class 7
As this question is already wrong a mammal can not have 6 legs.

Ans 29:

ATHARVA from Vibgyor High, Vadodra
Class : Class 2

Ans 30:

Syeda Aleeza Zaidi from Somerville school Noida , Noida
Class : Class 5
I thought this could be an insect as it HAS SIX LEGS. And some spiders( I know they are not insects ) have more than two eyes so it could be possible that the correct answer is b. But it has fur and is feeding its young one milk so the answer should be d

Ans 31:

Manasvi Nagpal from blooming dales international school, sri ganganagar
Class : Class 5
ans is DBECAUSE IT IS A IMAGINARY ANIMAL

Post Your Answer

Michael Alexander from St. Thomas Public School, Thiruvanthapuram
Subject :NSO    Class : Class 5

Ans 1:

Samyaraj Chowdhury from DPS Ruby Park, Kolkata, Kolkata
Class : Class 8
The answer should be C. But answer is given B which is impossible.

Ans 2:

Srija Das from Sent Joseph Convent Chandannagar, Serampore
Class : Class 10
CORRECT ANSWER SHOULD BE C

Ans 3:

Ankush Ghosh from DPS, Doha
Class : Class 10
2 should be opaque and 1 transparent, or both opaque

Ans 4:

Samarth Sabari from GIIS, Singapore
Class : Class 9
how is it B!?

Ans 5:

P A Reyyansh from Ann Mary School, Dehradun
Class : Class 10
IF SOF CAN EXPLAIN THIS CORRECTLY, THEN I WILL STOP DOING PRACTICE OF ANY OLYMPIAD

Ans 6:

Shreyasi Padihary from The Cambridge International School , Bangalore
Class : Class 7
The ans should be C.

Ans 7:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4

Ans 8:

Ishaan Ahuja from TSMS, Noida
Class : Class 6
cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Ans 9:

Shreyan from Delhi Public School Bangalore East, Bangalore
Class : Class 5
howwwwwwww ccccccccccc

Ans 10:

Pratham Dave from GNS, Bangalore
Class : Class 7
In the solutions it is showing C as correct option but in front It is showing B as the answer to this question. please correct the answer.

Ans 11:

Bhavya Agrawal from Cambridge Court High School , JAIPUR
Class : Class 8
WHY YOU TYPE SO MANY C Ishaan

Ans 12:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5
answer is c sof is wrong

Ans 13:

ishaani vats from shriram school, gurgaon
Class : Class 5
I could not find any logic in this answer. Can anyone explain it? THANS FOR READING!!!

Ans 14:

ARCHISHA SIKDAR from CHOITHRAM MANIKBAG, INDORE
Class : Class 8
ANSWER WILL BE 'C ' CAUSE THROUGH TRANSPARENT MATERIAL WE CANNOT SEE SHADOW OF A THING BUT THROUGH OPAQUE MATERIAL WE CAN SEE A THING'S SHADOW

Ans 15:

Swastik Srivastava from Baldwin Boys High School, Bangalore
Class : Class 5
correct ans is C

Ans 16:

from kalyan, Kalyan
Class : Class 6
Blunders made by SOF. PLEASE FIX THIS !!!!!

Ans 17:

Ishir Jha from Gyan Ganga Global Academy, Rosera
Class : Class 8
It explains c is the correct ans but on the front it says b. Someone please correct this. They cut my marks also.

Ans 18:

Sunishka Khatri from Global Indian International School, Pune
Class : Class 6
The guys who solved the paper and created this test was in hurry. So he did not take efforts to review his answers, hence many answers are wrong here. How will students trust on these guys?

Ans 19:

Shreyan from Delhi Public School Bangalore East, Bangalore
Class : Class 5
how is it b

Ans 20:

samanvay sinha from School of India, Bangalore, bengaluru
Class : Class 5
There must be a technical issue because when I read the solution, it was written that the correct answer is C.

Ans 21:

Pragun goel from Venkateshwar International School, Delhi
Class : Class 8
the answer is c 'cause material 1 is transparent and material 2 is opaque. The solution also says c. Typing error. Thanks for reading

Ans 22:

Mohul Gandhi from Podar International School, Powai, Mumbai
Class : Class 8
ans should be c!!! I am reporting an error

Ans 23:

Arnav kaul from Chirec, Hyderabad
Class : Class 2

Ans 24:

Jishnu Dutta from St. Stephen's School, Kolkata
Class : Class 9
Ans is c as you see light can't pass through material 2 and can pass through material 1. According to SOF ans b which mean light can pass through cardboard and can't through clear pastic sheet!!!!!. Please correct this SOF or it can be a typing mistake. Thanks for reading.

Ans 25:

Aarush Thakur from DPS, Gurgaon
Class : Class 6
The sol says ans is C but it correct ans is B.

Ans 26:

Tanvi from hh, delhi
Class : Class 7
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Ans 27:

Devina kashyap from TPS, Mumbai
Class : Class 4
and should be C and i did C cut now it is showing that i have done B!!

Ans 28:

RIDHASEN PRIYASEN SHAH from The Rajkumar College, Rajkot, Rajkot
Class : Class 4
The solution itself explains that c is the correct ans. So that means m2 is opaque and m1 is transparent. Please someone correct this ans

Ans 29:

Ishaan Ahuja from TSMS, Noida
Class : Class 6
never use sof trainer they know nothing

Post Your Answer

Bhavya Jha from Global City International School, Bangalore, Karnataka, India
Subject :NSO    Class : Class 5

Ans 1:

Harjot Singh from GIIS KL, Kuala Lumpur
Class : Class 4
THE CORRECT ANSWER SHOULD BE 5492

Ans 2:

Sohan Choudhury from Delhi Public School Electronic City Bengaluru, Bengaluru
Class : Class 6

Ans 3:

Harjot Singh from GIIS KL, Kuala Lumpur
Class : Class 4

Post Your Answer

Debraj Das adhikary from Ramakrishna mission vidya bhaban , midnapore, Midnapore
Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
These are referred to as X-linked genes.

Post Your Answer