National Science Olympiad Forum By SOF Olympiad Trainer - Page 665
  1. Home
  2. /  Forum

User Forum

Ask Your Question
SAGNIK CHAKRABORTY from DELHI PUBLIC SCHOOL , KOLKATA
Subject :NSO    Class : Class 5

Ans 1:

Haroon T K from Silver Hills public school , Calicut
Class : Class 5
how?

Ans 2:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
Mechanical force is the only correct answer .

Ans 3:

Rudra Tripathi from DPS Noida, Noida
Class : Class 10
Mechanical force

Ans 4:

VAIBHAVH RAMESH from NARAYANA ETECHNO WHITEFIELD, BANGALORE
Class : Class 5

Ans 5:

SARVESH RAMESH from DPS MIS, QATAR
Class : Class 8

Ans 6:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
how is it mechanical?

Ans 7:

Syeda Aleeza Zaidi from Somerville school Noida , Noida
Class : Class 5
How it is d???Shouldn't it be c

Ans 8:

Trideev Reddy Maddirevula from IIPS, Riyadh
Class : Class 7
push and pull are examples of mechanical force

Ans 9:

Daksh from RKC, Rajkot
Class : Class 8

Ans 10:

Aishee Sarkar from St. Stephens School , Kolkata , West Bengal, Kolkata
Class : Class 4
answer D

Ans 11:

Biju Pappachan from Rkc , Raipur
Class : Class 1
I did C frictional force but SOF says it is D mechanical force. How is it mechanical force?

Ans 12:

Atul Sanjeev from Indian School Al Ghubra, Muscat
Class : Class 9
how is it mechanical force?

Ans 13:

ARNAV GARG from PRUDENCE SCHOOL, New Delhi
Class : Class 10
mechanical

Ans 14:

ARNAV GARG from PRUDENCE SCHOOL, New Delhi
Class : Class 10
mechanical

Ans 15:

VAIBHAVH RAMESH from NARAYANA ETECHNO WHITEFIELD, BANGALORE
Class : Class 5

Ans 16:

Monika Bhattacharya from the lexicon international school kalyaninagar, pune
Class : Class 5
The answer given by SOF is wrong so they have not given the solution to this question.

Ans 17:

ARNAV GARG from PRUDENCE SCHOOL, New Delhi
Class : Class 10
mechanical

Ans 18:

Pratham Dave from GNS, Bangalore
Class : Class 7
It is option C

Ans 19:

Shriyann from Suniti Devi Singhania School, Thane
Class : Class 9

Ans 20:

Daksh from RKC, Rajkot
Class : Class 8
How the answer is D . Mechanical force

Ans 21:

Arnav kaul from Chirec, Hyderabad
Class : Class 2

Ans 22:

ARYAN DAS from LOKHANDWALA FOUNDATION SCHOOL, MUMBAI
Class : Class 8
how is it mechanical ????????????

Ans 23:

Aaditva from Vasant Valley School, New Delhi
Class : Class 7
how??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

Ans 24:

Yashasvika from Euro World School, Sri Ganganagar
Class : Class 5
how???

Ans 25:

Shruti Rajshree from NPS Indiranagar, Bengaluru
Class : Class 3
Can somebody explain why it is mechanical force ????

Ans 26:

P A Reyyansh from Ann Mary School, Dehradun
Class : Class 9
Mechanical Force

Ans 27:

Thejas S from Gopalan International School, Bangalore
Class : Class 3
c is correct

Ans 28:

Gauransh Singla from DPS , Navi Mumbai
Class : Class 5

Ans 29:

Mrigank Roy from Delhi Public School Ghaziabad, Ghaziabad
Class : Class 9
How is it mechanical? Please explain

Ans 30:

Manasvi Nagpal from blooming dales international school, sri ganganagar
Class : Class 5
how???????????????????????????????????????????????????????????????????????????is mechanical?????????????????????????????????????????????????????????????????

Ans 31:

Rohan TR from Sri Aurobindo memorial school, Bangalore
Class : Class 6
It is frictional force

Ans 32:

SANVI ROHILLA from The little shri, Rohtak
Class : Class 5

Ans 33:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5
It is mechanical

Ans 34:

Goutham Ram from Lecole' Chempaka International, Trivandrum
Class : Class 5
I was about to get 10/10 this 1 made me lose it.

Ans 35:

Arghya Kashyap from Modern Delhi Public School, Faridabad
Class : Class 7

Ans 36:

Vaibhav Elisetti from sri chaitanya techno school Nallagandla, Hyderabad
Class : Class 7
the corect answer is C

Ans 37:

TRINABH PANDA from NPSI, Chennai
Class : Class 6
actually it is contact force .But SOF is mad so it said the wrong answer but the correct answer is CONTACT FORCE

Ans 38: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
Mechanical Force.

Post Your Answer

NIRMAY JOSEPH from St Columba's School, New Delhi , New Delhi
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

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

Post Your Answer

Ashher Pervez from DPS Bhilai, Bhilai
Subject :NSO    Class : Class 5

The given graph shows the changes in the population of an insect found on a Jackfruit tree after four different sprayings of the same insecticide.

What conclusion can you draw from the graph?

A The insecticide had no effect on the insects at all.
B The insect population had become resistant to the insecticide.
C The insect population increased as the wrong type of insecticide was used.
D The insecticide helped to reduce the number of insects permanently.


Ans 1:

Abhigyan Panja from HEMSHEELA MODEL SCHOOL, DURGAPUR
Class : Class 5

Ans 2:

shalini mittal from DPS Greater Noida, Greater noida
Class : Class 4
answer is b only because it is decreasing also

Ans 3:

Praatham Kumar from DPS NERUL NAVI MUMBAI, Navi Mumbai
Class : Class 5
IF B IS ANSWER THAN GRAPH SHOULD BE ALMOST UNIFORM.. THE GROWTH IS INCREASING AFTER 3RD-4TH SPRAYING

Ans 4:

Harsh Sobti from the samhita academy, BLR
Class : Class 5
it is supposed to be D. the graph should be going down slowly and not increasing if the answer was B.

Ans 5:

Sumit Biswal from Dps gandhinagar, Gandhinagar
Class : Class 7
C

Ans 6:

Sumit Biswal from Dps gandhinagar, Gandhinagar
Class : Class 7
D cannot be correct because it increased after 3rd and 4th spray

Ans 7:

Devrajan from Amity International School, Noida
Class : Class 8
The pesticide is partially effective because there is a drop in population after each spraying. Hence, B CANNOT BE THE CORRECT ANSWER.

Ans 8:

sankerths s from Shishya BELM public School, Bangalore
Class : Class 10
It is C because after the guy used the 3rd and 4th pesticide the insects started increasing

Ans 9: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Ans 10:

Monika Bhattacharya from the lexicon international school kalyaninagar, pune
Class : Class 5
Answer is B akenis withis ve

Ans 11:

Pallav Agarwal from DLF PUBLIC SCHOOL SAHIBABAD, Ghaziabad
Class : Class 8
it is d.sof posted wrong answer

Ans 12:

navya ritika from DPS TAPI, SURAT
Class : Class 4

Ans 13:

Rishit Garg from Bhavan s B P Vidya Mandir , Nagpur
Class : Class 9
If b is the answer then why is the bar graph increasing day by day.😠

Ans 14:

Arav Gupta from Delhi Public School Gurgaon, Gurgaon
Class : Class 7
B is answer because when it decreases it is their natural death, otherwise they have become resistant thats why it is decreasing then increasing and not uniform.

Ans 15:

Mannan from Sherwood High, Bengaluru
Class : Class 7
I think the right answer should be C as when the 3rd spray was conducted the pest started to increase hence right answer answer is CThank you for appreciating me

Ans 16:

shivan iyer from dr pillai global academy, MUMBAI
Class : Class 4
b

Ans 17:

Swastik Srivastava from Baldwin Boys High School, Bangalore
Class : Class 5
wrong

Ans 18:

Hitarth Bhardwaj from Teoler High School, Jaipur
Class : Class 6
D

Ans 19:

Bhavya from ABC, Delhi
Class : Class 7
it should be 'D' but SOF shows the graph is decreasing and increasing which is not possible. it is the wrong graph as this can't happen.

Post Your Answer

Ashher Pervez from DPS Bhilai, Bhilai
Subject :NSO    Class : Class 5

Ans 1:

Amal Amzath Ali from jss international school, dubai
Class : Class 7

Ans 2:

Ishaan singhal from CCWS, Jaipur
Class : Class 3

Ans 3:

Ashwak from Cambridge, Jalandhar
Class : Class 8

Ans 4:

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

Ans 5:

Adhira Suresh from Vaels parent grade 3, chennai
Class : Class 6
Confusion between (B) and (C)

Ans 6:

Saksham Chanani from Sri Sri Academy, Kolkata
Class : Class 9

Ans 7:

Rishita Verma from Suncity School, Gurgaon
Class : Class 5

Ans 8:

Harsh Sobti from the samhita academy, BLR
Class : Class 5

Ans 9:

Radhika Gupta from Dps civil lines aligarh , Aligarh
Class : Class 8

Ans 10:

Amal Amzath Ali from jss international school, dubai
Class : Class 7

Ans 11:

Harsh Sobti from the samhita academy, BLR
Class : Class 5

Ans 12:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4

Ans 13:

sankerths s from Shishya BELM public School, Bangalore
Class : Class 10
A

Ans 14:

Radhika Gupta from Dps civil lines aligarh , Aligarh
Class : Class 8

Ans 15:

Niranjhan Rajeshkumar from Deens Academy, Whitefield, Bengaluru
Class : Class 7
It is "B". People who put "a" mixed up x

Ans 16:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 17:

Pratham Dave from GNS, Bangalore
Class : Class 7
B is the answer to this question

Ans 18:

Mannat Verma from Vivek High School , Chandigarh
Class : Class 6

Ans 19:

Yash Manjunath Neeralagi from JSS Public School, Bangalore
Class : Class 4

Ans 20:

Manasvi Nagpal from blooming dales international school, sri ganganagar
Class : Class 5
ANS B!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 21:

Anantjit Chander from The Modern School, Sector 85, Greater Faridabad, Faridabad
Class : Class 8
(B) or (C)?

Post Your Answer

Manit Aggarwal from St. Patricks Academy Bengaluru, Bangalore
Subject :NSO    Class : Class 1

Ans 1:

ARNAV GARG from PRUDENCE SCHOOL, New Delhi
Class : Class 10
C

Post Your Answer

Neevedita Singh from Auxilium Convent School Dum Dum, Kolkata
Subject :NSO    Class : Class 7

Ans 1:

Neevedita Singh from Auxilium Convent School Dum Dum, Kolkata
Class : Class 7
I got the answer ........Its option (C) SPLEEN

Post Your Answer

Manit Aggarwal from St. Patricks Academy Bengaluru, Bangalore
Subject :NSO    Class : Class 1

Ans 1:

Manit Aggarwal from St. Patricks Academy Bengaluru, Bangalore
Class : Class 6
manit d is the answer

Post Your Answer

Khwahish Sharma from Oakfield Public School , Jaipur
Subject :NSO    Class : Class 7

Ans 1:

Krishna Kabra from Magarpatta City Public School, Pune
Class : Class 8
Options B and D are correct

Post Your Answer

Bhabani Prasad from Narayan School, Kolkata
Subject :NSO    Class : Class 5

Ans 1:

NIVED PRAKASH NAIR from SARVODAYA, THIRUVANANTHAPURAM
Class : Class 8
The Xanthium IS dispersed by animals

Ans 2:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 9
I think that laksmi is saying correct because we cannot diffrentiate them as it is not clear that they are spines like in xanthium or feather like in dandelion

Ans 3:

Vihaan Patil from Bombay Scottish School, Mahim Mumbai
Class : Class 6
the damn picture needs to be clear

Ans 4:

shubhavi Dhondge from NPS, Banagalore
Class : Class 8
even I went with B

Ans 5:

krishneil from Elpro international school, Pune
Class : Class 6
The picture given did not look like xanthium neither dandelion ,so it looked like dandelion to me so I went with (B)Please give better images

Ans 6:

Sai Lakshmi Rao from Maneckji Cooper Education Trust, Mumbai
Class : Class 4
The picture is not clear and it cannot be said that it is a xanthium neither can it be said it is a dandelion. I went with B. Please show better qualities pictures sof.

Ans 7:

Soham Sharma from Kiit International School, Bhubaneswar
Class : Class 6
The correct answer should be B because it has a hairy structure and it can be dispersed by wind .nor its written that this is Xanthium

Ans 8:

ARNAV GARG from PRUDENCE SCHOOL, New Delhi
Class : Class 10
D

Ans 9:

Anantjit Chander from The Modern School, Sector 85, Greater Faridabad, Faridabad
Class : Class 8
The correct option is (C) or (B)?

Ans 10:

Mannat Verma from Vivek High School , Chandigarh
Class : Class 6
It is Xanthium which is dispersed by animals.

Ans 11:

Ashwak from Cambridge, Jalandhar
Class : Class 8
Can't understand

Ans 12:

Shreetej from Pearson public school, Pune
Class : Class 5
it is C as it is a Xanthium

Ans 13:

Nidhi Upadhyaya from S M shetty HIgh school, Mumbai
Class : Class 8

Ans 14:

Saksham Chanani from Sri Sri Academy, Kolkata
Class : Class 9
it has hair like structure

Ans 15:

Ahaan Mittal from Primus Public School, Bengaluru
Class : Class 8
it is dandelion isn't it??? i think it is wind because hair and size

Ans 16:

Ashher Pervez from DPS Bhilai, Bhilai
Class : Class 10
You are correct ans. is B wind because it seems to be light in weight and also hairs that acts like feathers and also wind can carry only light weight seeds.

Ans 17:

Aabhineet Patnaik from Lakshya International School, Kakinada
Class : Class 5
Correct answer is A !!! As it is having hair like structure so, it is carried by wind

Ans 18:

shaun joel dasari from subs, chennai
Class : Class 5
how is this possible

Ans 19:

Priyanshi Singh from Deens Academy Bangalore, Bangalore
Class : Class 5
The image looks nothing like cocklebur. It has to be a bit more clear,

Ans 20:

Shubham Majhi from Sri Chaitanya Techno School, Bangalore
Class : Class 5

Ans 21:

Saksham Chanani from Sri Sri Academy, Kolkata
Class : Class 9
Its B

Post Your Answer

yash kirpalani from st gregorios high school chembur, Mumbai
Subject :NSO    Class : Class 5

Ans 1:

ARNAV GARG from PRUDENCE SCHOOL, New Delhi
Class : Class 10

Ans 2:

Shreyansh Gupta from MVN, faridabad
Class : Class 5
ans is a April 3 1984 not ans c

Ans 3:

Yashasvika from Euro World School, Sri Ganganagar
Class : Class 5

Ans 4:

Bhavya from ABC, Delhi
Class : Class 7
IT IS IN 1984 WHEN MY MOTHER WAS BORN.

Ans 5:

Pratham Dave from GNS, Bangalore
Class : Class 7
A is the answer to this question

Ans 6:

Bhavya from ABC, Delhi
Class : Class 7
IT IS JUST ON MY BIRTHDAY SO I REMEMBER IT. OPTION C IS THE ANSWER

Ans 7:

Mathamagician from BGSNPS, Bengaluru
Class : Class 6
No, it is actually none, it was on 2nd April 1984.

Ans 8:

Anas Matin Barmare from DPS, Dubai
Class : Class 8
Hey, mathamagician. Uh it could also be April 3 since the dates might differ by a few days due to there being many sources.

Ans 9:

suday ghai from DPS NOIDA, GAUTAM BUDDHA NAGAR
Class : Class 5
I HAD CONFUSION WITH A AND C

Ans 10:

Ashher Pervez from DPS Bhilai, Bhilai
Class : Class 10
Answer is A April 3, 1984

Ans 11:

sanjana from NARAYANA E TECHNO , Chennai
Class : Class 8
the answer is 2nd april 1984 i got confused

Ans 12:

ARNAV GARG from PRUDENCE SCHOOL, New Delhi
Class : Class 10

Ans 13:

Anantjit Chander from The Modern School, Sector 85, Greater Faridabad, Faridabad
Class : Class 8
(A) is the correct answer

Post Your Answer