National Science Olympiad Forum By SOF Olympiad Trainer - Page 706
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from ,
Subject :NSO    Class : Class 9

Ans 1: (Master Answer)

from ,
Class :
The correct answer is B.

Ans 2:

from ,
Class :
pay attention to sum of their digits

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from ,
Subject :NSO    Class : Class 9

Ans 1:

from ,
Class :
9.6

Ans 2:

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

Ans 3:

from ,
Class :

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from ,
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:

from ,
Class :
The answer is 12cm

Ans 3:

from ,
Class :
The answer is 12cm

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from ,
Subject :NSO    Class : Class 8

Ans 1:

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 2:

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 3:

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

Ans 4:

Ananya from SGS , Trivandrum
Class : Class 5

Ans 5:

The Address from Somaiya, Mumbai
Class : Class 6

Ans 6:

from ,
Class :
When rubbed with fur, glass will become negatively charged. However if silk is used instead of fur, glass will acquire a positive charge.

Ans 7:

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

Ans 8:

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

Ans 9:

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

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

Ans 1: (Master Answer)

from ,
Class :
The correct answer is C.

Ans 2:

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

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
Protons don't move.

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from ,
Subject :NSO    Class : Class 5

Ans 1:

from ,
Class :
D

Ans 2:

from ,
Class :
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

Ans 1:

from ,
Class :
B

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from ,
Subject :NSO    Class : Class 10

Ans 1: (Master Answer)

from ,
Class :
The correct answer is D.

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

Ans 1:

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

Ans 2:

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

Ans 3:

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 4:

from ,
Class :
cONFUSED IN d AND B

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9: (Master Answer)

from ,
Class :

Ans 10:

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 11:

from ,
Class :
b as Y expands more

Ans 12:

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

Ans 13:

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 14:

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

Ans 15:

from ,
Class :
C is the correct answer

Ans 16:

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

Ans 17:

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 18:

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

Ans 19:

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 20:

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

Ans 21:

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

Ans 22:

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

Ans 23:

from ,
Class :
b

Ans 24:

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 25:

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

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Kshitij Gupta from St Kabir din, Ahmedabad
Subject :NSO    Class : Class 8

Ans 1:

from ,
Class :
the answer will be 'A'

Ans 2:

Raghav Tyagi from birla vidya niketan, new delhi
Class : Class 10
In reactivity series hydrogen is below zinc and is less reactive than zinc. As hydrogen below zinc therefore will reduce more and earlier than zinc , hence will go to cathode and zinc will reduced or deposit at anode. therefore P will be connected to R and Q to S.hence ans is :C

Ans 3:

Anshuman D from MVM, Hyderabad
Class : Class 9
Yes the answer is A

Ans 4:

Chaitanya L K from SKCHEC, bangalore
Class : Class 8
Yes it is A

Ans 5:

Nishtha Neelabh from Lok Puram Public School, Thane West
Class : Class 6
answer should be A, as hydrogen is not released at cathode if the other cation is Zinc or below in the electrochemical series

Ans 6:

Bipasana from KV IIT Kanpur, Kanpur
Class : Class 9
It has to be A.

Ans 7:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8
Answer is a

Ans 8:

Prabhav Kaushik from DPS Noida, Noida
Class : Class 10

Ans 9:

Raghav Tyagi from birla vidya niketan, new delhi
Class : Class 10
thus answer is a

Ans 10:

Paarth Vashistha from Kunskapsskolan Gurgaon , Gurgaon
Class : Class 8
A

Ans 11:

Dhars from DPS EAST Bangalore , Bengaluru
Class : Class 10
the answer is wrong.....it should be a

Ans 12:

from ,
Class :
WWWWRRRROOOONNNNNNNNNNGGGGGGGGGGGGGGGGG

Ans 13:

Abhay Agarwal from St Francis School, Ghaziabad
Class : Class 9

Ans 14:

Abhay Agarwal from St Francis School, Ghaziabad
Class : Class 9
answer A

Ans 15:

Raghav Tyagi from birla vidya niketan, new delhi
Class : Class 10
my apologies for the previous explanation answer is : C

Ans 16:

from ,
Class :
cation(Zn2 ) must be deposited to the cathode.

Ans 17:

Akshara from NPS, Bengaluru
Class : Class 8
Yes it should be A .

Ans 18:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
i do feel that correct answer is A.as P has to be electroplated ,it must be on cathode(-ve).so,correct is =A

Ans 19:

from Bhandari Public School, KHANDWA
Class : Class 9
The correct answer is AAAAAAA

Ans 20:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8
answer is a

Ans 21:

Amrit Biswas from INDUSVALLEY PUBLIC SCHOOL, Noida
Class : Class 10
What is the correct answer A or C ???????

Ans 22:

Tanush from presidency east, Bangalore
Class : Class 5
And for this question must be A

Ans 23:

Vartika Agarwal from Phoenix world school, Pune
Class : Class 9
I will go mad with the number of wrong answers in this website.. answer should be a. For example when a spoon has to be electroplated with copper, copper is ALWAYS ON ANODE and the spoon is ALWAYS ON CATHODE. Why different logic is used here?

Ans 24:

aditya arora from Heritage Experiential Learning School, gurugram
Class : Class 8
it should be a

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