National Science Olympiad Forum By SOF Olympiad Trainer - Page 698
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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI
Subject :NSO    Class : Class 9

Ans 1: (Master Answer)

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

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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI
Subject :NSO    Class : Class 9

Ans 1:

harnoor from cambridge international school, nawanshahr
Class : Class 9
pay attention to sum of their digits

Ans 2: (Master Answer)

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

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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI
Subject :NSO    Class : Class 9

Ans 1:

Ridhi Maheshwari from NLDHS, Mumbai
Class : Class 9
Can u pls send the method

Ans 2:

Gireesha from innocent hearts school jalandhar, Jalandhar
Class : Class 10

Ans 3:

Rohan from kennedy high the global school, HYDERABAD
Class : Class 9
9.6

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ADITYA KUMAR from CSDAV PUBLIC SCHOOL, MOTIHARI
Subject :NSO    Class : Class 9

Ans 1:

abhijeet mishra from bhubaneswar model public school, bhubaneswar
Class : Class 10
the answer is 12 cm

Ans 2:

Nirmal joshi from New Beersheba, Pithoragarh
Class : Class 9
The answer is 12cm

Ans 3:

Nirmal joshi from New Beersheba, Pithoragarh
Class : Class 9
The answer is 12cm

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Mrinal garg from St. Joseph's Convent senior secondary school, Bathinda
Subject :NSO    Class : Class 8

Ans 1:

Sainyam Sharma from Thakur Public School, Mumbai
Class : Class 8
positive charge is acqired

Ans 2:

meghna from Asan Memorial Senior secondary school, Chennai
Class : Class 4

Ans 3:

The Address from Somaiya, Mumbai
Class : Class 6

Ans 4:

Aham from vibgyor high, Bangalore
Class : Class 8
This is wrong, yet nothing has been done to fix it. It has been discovered to be wrong FOUR YEARS ago!

Ans 5:

Ethel shiju from National Public School Indiranagar, Bangalore
Class : Class 9
When rubbed with fur, glass will become negatively charged. However if silk is used instead of fur, glass will acquire a positive charge.

Ans 6:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
The options given here are a plastic scale,a woollen cloth, an inflated balloon and a COPPER rod, not a GLASS rod. How can the options appear differently for others, since many people here are saying that there is glass rod involved? Also, plastic is an insulator of electricity, so ideally it wouldn't acquire any charge, right? SOF should give a solution to this problem.

Ans 7:

Srikar from SSRVM, Bangalore
Class : Class 9
glass rod when rubbed with fur, it gives electrons to fur and becomes positively charged

Ans 8:

Vihaan Nair from Ambassador School, DUBAI
Class : Class 8
Plastic is unable to be charged.. Wrong answer!

Ans 9:

Akshara from NPS, Bengaluru
Class : Class 8
Answer is A... positive charge is acquire by the glass rod

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Siddharth Mahesh from mdav public school , Hyderabad
Subject :NSO    Class : Class 8

Ans 1:

ANIKA SHUKLA from UDGAM SCHOOL FOR CHILDREN, AHMEDABAD
Class : Class 10
Protons don't move.

Ans 2: (Master Answer)

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

Ans 3:

ANIKA SHUKLA from UDGAM SCHOOL FOR CHILDREN, AHMEDABAD
Class : Class 10

Ans 4:

Aryaman Neb from Tagore International School, New Delhi
Class : Class 5
Why

Ans 5:

ANIKA SHUKLA from UDGAM SCHOOL FOR CHILDREN, AHMEDABAD
Class : Class 10

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Shivangi from St. Michael's High School, Patna
Subject :NSO    Class : Class 5

Ans 1:

sai ramakrishna GUDIMETLA  from AMM MATRICULATION HIGHER SECONDARY SCHOOL, Chennai
Class : Class 5
D

Ans 2:

sai ramakrishna GUDIMETLA  from AMM MATRICULATION HIGHER SECONDARY SCHOOL, Chennai
Class : Class 5
D

Ans 3:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
It should be option C. It should be discouraged.

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from , Kolkata
Subject :NSO    Class : Class 4

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Anvesh from navy Children school, mumbai
Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

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

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Soham De from DPS, Nerul, Mumbai
Subject :NSO    Class : Class 5

Ans 1:

Saipriya from Sankara, Chennai
Class : Class 9
B m kids because Y is only curled much . dont get angry

Ans 2:

aditya parlewar from St. Xaviers High school , Nagpur
Class : Class 3
b

Ans 3:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
The answer should be opt.B

Ans 4:

shubhavi Dhondge from NPS, Banagalore
Class : Class 9
B is the answer

Ans 5:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
Sumit Singhal , this is a bimetallic metal . Here , the two metals cannot go away from each other . So here , if y expands than x will also expand , and if x expands than y will also expand . I am getting confusion between A and B .

Ans 6:

Bhargavi from Bethany, Bangalore
Class : Class 1
The answer is B because the question says that he HEATED both the metals (most metals expand on heating) and Y has expanded more than X

Ans 7:

Aarnav Grover from Anand Niketan Shilaj, Ahmedabad
Class : Class 9
d

Ans 8:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
B because if Y expands and X contracts, X will be a lot smaller than Y. Here, both are almost the same size.

Ans 9:

Arav Singh from Jyoti Niketan School, Azamgarh
Class : Class 6
b

Ans 10:

Hitanshi Behera from Loyola School , Bhubaneswar
Class : Class 4
sof does not reply that is why we are confused

Ans 11:

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

Ans 12:

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

Ans 13:

aditya parlewar from St. Xaviers High school , Nagpur
Class : Class 3

Ans 14:

Hitanshi Behera from Loyola School , Bhubaneswar
Class : Class 4
iron-nickel alloy notable for its lack of expansion or contraction with temperature changes. hence all metals do NOT expand

Ans 15:

Fareeha siddiqua from Janki Devi public school , Mumbai
Class : Class 5
b as Y expands more

Ans 16:

Hitanshi Behera from Loyola School , Bhubaneswar
Class : Class 4
ans should be D as if metal x contracts and metal y expands then the 2 metals will bend inward an as an ellusion we see that y is longer than x

Ans 17:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
D or B? please vote

Ans 18:

Arav Gupta from Delhi Public School Gurgaon, Gurgaon
Class : Class 8
D or B not sure.

Ans 19:

ayush from kv no.1 dhanbad, Dhanbad
Class : Class 10
B

Ans 20:

Anahita Baruah from DPS Bangalore East, Bengaluru
Class : Class 3
All metal expands on heating. Here metal Y expands more which leads to curling of both X and Y. B is the correct option.

Ans 21:

SHUBHANI LAKHERA from ANN MARY SCHOOL, Dehradun
Class : Class 5
B is the right answer

Ans 22:

Sanskriti Nagar from Rose Bud Academy, khagaria
Class : Class 5
B is the correct answer

Ans 23: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Ans 24:

Srishti Rani from DBMS ENGLISH SCHOOL, Jamshedpur
Class : Class 5
cONFUSED IN d AND B

Ans 25:

Ishaan Singhal from CCWS, Jaipur
Class : Class 5
as if we will contract metal x so it is not neccessery that y will contract if we contract metal y x has to be conyracted with it ans should be a

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