National Science Olympiad Forum By SOF Olympiad Trainer - Page 628
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Rehan Agrawal from Indian School Ghubra, Muscat
Subject :NSO    Class : Class 8

Ans 1:

Vihaan Nair from Ambassador School, DUBAI
Class : Class 8
Solution States that "correct" answer is wrong!

Ans 2:

Shreya Mahesh from Sri Sri Ravishankar Vidya Mandir, Bangalore
Class : Class 8
Option A

Post Your Answer

Atul Sanjeev from Indian School Al Ghubra, Muscat
Subject :NSO    Class : Class 5

Ans 1:

Alay Shah from Euro School, Thane
Class : Class 5
Explanation in the solution is not matching any options. According to explanation option one and three are correct.

Post Your Answer

yana from VIDYA VIKASINI HIGH SCHOOL, VASAI
Subject :NSO    Class : Class 4

Ans 1:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
salt

Ans 2:

Shaurya Suryawanshi from The Orbis school, Pune
Class : Class 7
It's chalk powder

Ans 3:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
coffee powder

Ans 4:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
my actual answer is salt

Ans 5:

Yajur Nag from dps vk, delhi
Class : Class 5

Ans 6:

Harsh Sobti from the samhita academy, BLR
Class : Class 5
why is chalk powder the correct answer?

Ans 7:

AHANA BAG from DELHI PUBLIC SCHOOL JOKA SOUTH KOLKATA, KOLKATA
Class : Class 9
The correct answer is C . It will be coffee power.

Ans 8:

Riddhima Pandey from Chinmaya Vidyalaya, Bokaro Steel City
Class : Class 3
Ans-d

Ans 9:

Shaurya Suryawanshi from The Orbis school, Pune
Class : Class 7
It's chalk powder

Ans 10:

NARAYANAN VENKITASUBRAMANI from THE PSBB MILLENNIUM SCHOOL, Coimbatore
Class : Class 8

Ans 11:

ANAY GUPTA from CMS KANPUR ROAD LUCKNOW, LUCKNOW
Class : Class 8
salt for the way

Ans 12:

Manan thorat from Podar powai, Mumbai
Class : Class 4
The answer is D because D cant desolve in water while others can.So the answer is D.

Ans 13:

Ashwak from Cambridge, Jalandhar
Class : Class 9
chalk powder is insoluble in water while others are soluble, chalk powder can be separated from water by sedimentation and decantation or filtration but others need evaporation...… Now I think Harsh you understood why the answer is D!!

Ans 14:

Student from School, City
Class : Class 8

Ans 15:

Anika S Kumar from Alphabets International school , Chennai
Class : Class 7
Coffee powder

Ans 16:

Aryan Bomanwar from Chirec international School, HYDERABAD
Class : Class 6
It's C coffee powder.

Ans 17:

Saarang roy from Indian school ghubra, Muscat
Class : Class 6
The correct answer is d chalk powder because it is insoluble in water while the rest are not.

Ans 18:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
coffee powder

Ans 19:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
Coffee Coffee Coffee Coffee Calls out Calls out the answer is C in the answer it is me it is me it is me

Ans 20:

Naitik Banerjee from DPS Ruby Park Kolkata, Kolkata
Class : Class 5
The correct answer is d

Post Your Answer

Yajur Nag from dps vk, delhi
Subject :NSO    Class : Class 4

Ans 1:

Atharva Batra from Modern Delhi Public School, Faridabad
Class : Class 4
5

Ans 2:

Gunnit Kant from DPS, Nerul, Navi Mumbai
Class : Class 5
its d

Ans 3:

Niteen Jit Sahu from Diya Academy of Learning, Bengaluru
Class : Class 7
5 is the answer because there is even semi circle there with rectangle,square and triangle.

Ans 4:

Abhinav Kulkarni from National Centre For Excellence, Bengaluru
Class : Class 4
55555555555555555555555555555555555555555 is the ans

Ans 5:

MIERA SHARMA from DPS AGRA, AGRA
Class : Class 8
IT SHOULD BE 5 AS THERE IS SQUARE TRIANGLE SEMECIRCLE RECTANGLE AND DIAMOND

Ans 6:

Avya Pandey from NPS International, Singapore
Class : Class 8
b as there is a semi-circle

Ans 7:

PARTH PANCHAL from NEW HORIZON SCHOLARS SCHOOL, THANE
Class : Class 7
the answer can even be 'B' as semi-circle is there ,made by square

Ans 8:

Sahanaa from Sancta Maria International School, Hyderabad
Class : Class 8
How are we supposed to know it’s a rectangle when hidden by the circle ,bonne nuit

Ans 9:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
5

Ans 10:

Mayukh chatterjee from Somerville School Noida, Noida
Class : Class 5
why semicircle not be counted

Ans 11:

ishit from EUROSCHOOL THANE, THANE WEST
Class : Class 7
Can you tell the answer of this question

Ans 12:

ayurda prasad from Delhi Public School, Faridabad
Class : Class 3
ayurda 4 d 4

Ans 13:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
semicircle is there but made by square so the answer is 4

Ans 14:

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

Ans 15:

Aalia Nair from Bombay Scottish School Mahim, Mumbai
Class : Class 4
4 IS THE CORRECT ANSWER

Ans 16:

Ashwak from Cambridge, Jalandhar
Class : Class 9
The answer is D) 4

Ans 17:

Shaurya Shrivastava from Amanora school, Pune
Class : Class 6

Ans 18:

Mohhika Sharma from Delhi Public School Greater Noida, Greater Noida
Class : Class 7
There is no semicircle.Answer is 4.

Ans 19:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
How 5? answer is 4The shapes are:circle,triangle,rectangle and square

Ans 20:

Shaurya Shrivastava from Amanora school, Pune
Class : Class 6
all listen it should be 5 as i think because the rectangle is dividing the circle into two halves which is forminig a semi circle and if sof has to 4 which means that it should be a whole shape like circle triangle etc.so if it is wholes shape SOF is right or elseNiteen Jit Sahu and all others who say semi circle are right

Ans 21:

Daksh Chanani from Sri Sri academy, Kolkata
Class : Class 8
SEMICIRCLE5B

Post Your Answer

Rehan Agrawal from Indian School Ghubra, Muscat
Subject :NSO    Class : Class 8

Ans 1:

Mridul Jain from Shishukunj International School Indore, Indore
Class : Class 9
I'm confused about the same thing...friction opposes relative motion, so it will obviously be towards west??

Ans 2:

Vayun from NPS HSR, Bengaluru
Class : Class 8
Answer is D

Ans 3:

Aanya from DAV, Gurgaon
Class : Class 8
I think that option "D" is the correct answer as friction is always opposite to direction of motion of the object

Ans 4:

Rishi Gopi from Loyola, Trivandrum
Class : Class 9

Ans 5:

Bipasana from KV IIT Kanpur, Kanpur
Class : Class 9
The answer is A.

Ans 6:

vedant from st john senior secondry school, greater noida west
Class : Class 7
Answer is d

Ans 7:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

Ans 8:

Ankit kumar Jha from Ryan International School , Ghaziabad
Class : Class 9
I ALSO THINK THE ANSWER IS D

Ans 9:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
the answer is D but is given wrong in this question .

Ans 10:

Rehan Agrawal from Indian School Ghubra, Muscat
Class : Class 10

Ans 11:

Rishi Gopi from Loyola, Trivandrum
Class : Class 9
The correct answer is d as friction acts opposite to the direction of the applied force

Ans 12:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8
The answer should be D

Ans 13:

Palchin from Naval public school, Uran
Class : Class 8
the answer has to be d because friction always oppose the relative motion of an object no matter if it accelerates or not.

Ans 14:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
see guys, i think u all are mistaken. We dont consider in what direction the car is going, but in which direction the wheel is turning. for the car to go forwards, the wheel must roll clockwise. so for the car to go east, wheel must roll in the clockwise direction. Now consider a very small part of the wheel which is touching the ground. to wheel to roll in clockwise direction , that small part must slide backward, and that must continously happen in order for wheel to turn clockwise and car to go in east direction. And u know, friction is b/w the surface in contact, i.e the rolling part of the wheel, not with the car. so friction should oppose the backward-going part of the wheel, and thus in the ame direction with the motion of the car. if friction were to be in west, the car would never go in east direction, because the wheel would'nt have any force to oppose, to make it go in that direction, and thus the car would never be able to go towards the east direction!

Ans 15:

Arnav Gangwar from DPS NOIDA, GAUTAM BUDH NAGAR
Class : Class 8

Ans 16:

Spandan Trivedi from D.A.V. International School, Ahmedabad
Class : Class 8
Yes answer is D

Ans 17:

Anirudh from 989820Delhi Pubic school Rohini , Delhi
Class : Class 8
D

Ans 18:

Antarik Maity from Bharatiya Vidyabhaban, Kolkata
Class : Class 8
How can the direction of friction be towards east? It should always act in the direction opposite to that of the direction of the moving body, i.e., friction should act towards the west irrespective of whether the vehicle is accelerating or retarding. So the correct answer should be D!

Post Your Answer

Swarnava Pal from Vivekananda Mission School, Haldia
Subject :NSO    Class : Class 4

Ans 1:

Shaurya from Modern Public School, Bhiwadi
Class : Class 7
C because 25341 spells stick

Ans 2:

Shaurya from Modern Public School, Bhiwadi
Class : Class 7
C

Ans 3:

Dakala Murari from Indian school of excellence, Bangalore
Class : Class 4
c

Ans 4:

Khanak Jha from Prime Academy, Mumbai
Class : Class 4
it is wrong

Ans 5:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
25341

Ans 6:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
25341

Post Your Answer

Ajoy Bhuyan from Delhi public school, Bongaigaon
Subject :NSO    Class : Class 4

Ans 1:

Adway Bachchan from Indian School Sohar, Sohar
Class : Class 8

Ans 2:

Aayush Shere from City Pride School, Ravet, Pune
Class : Class 4
CAN SOMEONE EXPAIN?

Ans 3: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Ans 4:

Aaryaman Pradhan from De paul School , Berhampur
Class : Class 5
d

Ans 5:

Ashwak from Cambridge, Jalandhar
Class : Class 9
D

Ans 6:

Gurnoor from Chitkara International School, Chandigarh
Class : Class 5
ans was b and i wrote b

Ans 7:

Shiven Dinkar from DPS Noida, Delhi
Class : Class 4

Ans 8:

Krishiv Chandan Sukul from Seven 11 Scholastic School, Mumbai
Class : Class 6
YOU! An admin from Revisewise, you don't even own up to SOF's mistake.Da questions do not show properly and you think I'm responsible!

Ans 9:

anu from Haralur, Bengaluru
Class : Class 5

Ans 10:

Samarth Vijay Yeliathaya from Shri Kumarans Children home,cbse, Bangalore
Class : Class 5
d

Ans 11:

Saharsh Aggarwal from Redwood High International School, MUMBAI SUBUEBAN
Class : Class 6

Ans 12:

Divyanshi from The Heritage school, Kolkata
Class : Class 5
D is the right ansExplanation- LOW VITAMIN A - NIGHT BLINDNESSLOW V. B - BERI BERI

Ans 13:

Ibrahim Aslam from uttam, Ghaziabad
Class : Class 2
DDD

Ans 14:

anu from Haralur, Bengaluru
Class : Class 5

Ans 15:

Ajoy Bhuyan from Delhi public school, Bongaigaon
Class : Class 4

Ans 16:

Saharsh Aggarwal from Redwood High International School, MUMBAI SUBUEBAN
Class : Class 6
B is the answer

Ans 17:

Rahul from Cambridge school, noida
Class : Class 4
Explain PleaseI need the explaination

Ans 18:

anu from Haralur, Bengaluru
Class : Class 5
what they've went and done is put exxxtra optionsss! Real irratating

Ans 19:

ANAY GUPTA from CMS KANPUR ROAD LUCKNOW, LUCKNOW
Class : Class 8
d is the right answer

Post Your Answer

Sutirth Badu from Sherwood High, Bengaluru
Subject :NSO    Class : Class 4

Ans 1:

Syon from Sentia The Global School, Hyderabad
Class : Class 8

Ans 2:

k tagore from montessori school, KURNOOL
Class : Class 3

Ans 3:

Ayushi from DPS Noida, Noida
Class : Class 4
ans b is the answer......

Ans 4:

Ronav Kerkar from Jamnabai Narsee School, Mumbai
Class : Class 7

Ans 5:

vineet8026@gmail.com from dps, Doha
Class : Class 1
A

Ans 6:

Aaditva from Vasant Valley School, New Delhi
Class : Class 5
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB

Ans 7:

ishi gupta from DPS NOIDA, NOIDA
Class : Class 4

Ans 8:

EKLAVYA GONDULE from DPS BHILAI, Bhilai
Class : Class 7

Ans 9:

Shrihan Koley from Radiant International School , Patna
Class : Class 5
Seen you all later.

Ans 10:

shivansh from apeejay school, noida
Class : Class 5
It's answer should be B option

Ans 11:

Ajit kumar from Rps , Biharsharif
Class : Class 4

Ans 12:

Rahul from Cambridge school, noida
Class : Class 4
Olympiad trainer is saying wrong it would be B bcoz it is 18....

Ans 13:

BV Karthikeya from Sentia, Hyderabad
Class : Class 6

Ans 14:

Koyel Biswas from Adamas World School, Kolkata
Class : Class 5
option b

Ans 15:

Kairav Gupta from Bombay Scottish School, Mahim, Mumbai
Class : Class 4
Answer has to be option B

Ans 16:

Ankush Dey from Sri Chaitanya Techno School Newtown, Kolkata
Class : Class 6
SOF Trainer Is Saying Option D But I Think It Is Option C

Ans 17:

Aaditva from Vasant Valley School, New Delhi
Class : Class 5
How a Vineet?

Ans 18:

Kairav Gupta from Bombay Scottish School, Mahim, Mumbai
Class : Class 4
The answer should be option C

Ans 19:

Shamit Vashishth from Lucknow Public School, Lucknow
Class : Class 4
I think it is c.

Ans 20:

Anika S Kumar from Alphabets International school , Chennai
Class : Class 7
B

Ans 21:

Shrihan Koley from Radiant International School , Patna
Class : Class 5
My head is not working and you all are crowding at a simple question! The answer of this question is always bbbbbbbbbbbbbbbbbbbbbb. Are you all are a small kindergarten kids? I think yes. You all are a kids . I think you all will in class 9 or 10. I am sure.

Ans 22:

Ronav Kerkar from Jamnabai Narsee School, Mumbai
Class : Class 7
d

Ans 23:

VAIBHAV DINESH from Christ Nagar HSS, TRIVANDRUM
Class : Class 4

Post Your Answer

Dibyanshu Lahiri from Mont Fort Sr Sec School, Roorkee
Subject :NSO    Class : Class 8

Ans 1:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

Ans 2:

from , Hajipur
Class : Class 8
a is answer

Post Your Answer

Dibyanshu Lahiri from Mont Fort Sr Sec School, Roorkee
Subject :NSO    Class : Class 8

Post Your Answer