National Science Olympiad Forum By SOF Olympiad Trainer - Page 595
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Dhruvan G from Indian School al Ghubra, Muscat
Subject :NSO    Class : Class 8

Ans 1:

Anvi Jain from School, City
Class : Class 10

Ans 2:

Shreya Mahesh from Sri Sri Ravishankar Vidya Mandir, Bangalore
Class : Class 8
It is polyester and not polythene. Therefore B is the right answer. Rayon IS regenerated from wood pulp.

Ans 3:

Sampurna Mandal from DAV Public School Jagganath Talcher, Angul
Class : Class 8
Thanks for the answer

Post Your Answer

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

Ans 1:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7

Ans 2:

ATANU DAS from ALLEN CAREER INSTITUTE , KOTA
Class : Class 9
Option (D), electrons move from left to right & the protons are stable in the nucleus and they never move.

Ans 3:

Student from School, City
Class : Class 8
B is the Wrong Answer. Protons do not move as they are fixed to their nuclei.

Ans 4:

Arnav Raj Sharma from GEMS International School the ultra master mega, Gurgaon
Class : Class 7
B should be the correct answer

Ans 5:

Amrit Biswas from INDUSVALLEY PUBLIC SCHOOL, Noida
Class : Class 10
B is correct answer because,as we know protons are heavy and dont move but due to the movement of electrons protons are pushed towards the opposite direction

Ans 6:

Hprakash09 from Billabong high Bhopal, Bhopal
Class : Class 7
B is wrong, as protons cannot move from their positions in an atom.

Ans 7:

aditya arora from Heritage Experiential Learning School, gurugram
Class : Class 8
B is the correct answer, as the protons might be a part of the nucleus, but the nucleus as a whole is a positively charged particle as well, therefore, it moves to right

Ans 8:

Tarun from Narayana school, Chennai
Class : Class 8

Post Your Answer

Anshita Bardoloi from Delhi Public School Guwahati, GUWAHATI
Subject :NSO    Class : Class 5

Ans 1:

AREEN from BOLTON, HYDERABAD
Class : Class 6
Ans is A because of this relationship: Sedimentary : Metamorphic : Igneous

Ans 2:

AREEN from BOLTON, HYDERABAD
Class : Class 6
Ans is A because of this relationship: Sedimentary : Metamorphic : Igneous

Post Your Answer

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

Ans 1:

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

Ans 2:

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

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:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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 7:

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 8:

Yajur Nag from dps vk, delhi
Class : Class 5

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

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 15:

Student from School, City
Class : Class 8

Ans 16:

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

Ans 17:

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 18:

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

Ans 19:

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

Ans 20:

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

Post Your Answer

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

Ans 1:

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 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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 6:

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

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:

Daksh Chanani from Sri Sri academy, Kolkata
Class : Class 7
SEMICIRCLE5B

Ans 9:

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 10:

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

Ans 11:

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

Ans 12:

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 13:

Shaurya Shrivastava from Amanora school, Pune
Class : Class 6

Ans 14:

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

Ans 15:

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

Ans 16:

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

Ans 17:

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

Ans 18:

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

Ans 19:

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

Ans 20:

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 21:

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

Post Your Answer

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

Ans 1:

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

Ans 2:

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 3:

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

Ans 4:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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!

Ans 10:

Rishi Gopi from Loyola, Trivandrum
Class : Class 9

Ans 11:

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

Ans 12:

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 13:

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

Ans 14:

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

Ans 15:

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 16:

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 17:

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

Ans 18:

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??

Post Your Answer

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Post Your Answer

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

Ans 1:

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

Ans 2:

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 3:

Bharat Aggarwal from Kalyani school, Pune1
Class : Class 4

Ans 4:

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

Ans 5:

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

Ans 6: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Ans 7:

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

Ans 8:

Bharat Aggarwal from Kalyani school, Pune1
Class : Class 4
B is the answer

Ans 9:

Ibrahim Aslam from uttam, Ghaziabad
Class : Class 6
DDD

Ans 10:

Ashwak from Cambridge, Jalandhar
Class : Class 9
D

Ans 11:

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

Ans 12:

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

Ans 13:

anu from Haralur, Bengaluru
Class : Class 5

Ans 14:

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

Ans 15:

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

Ans 16:

Shiven Dinkar from DPS Noida, Delhi
Class : Class 4

Ans 17:

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

Ans 18:

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

Ans 19:

anu from Haralur, Bengaluru
Class : Class 5

Post Your Answer