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from ,
Subject :NSO    Class : Class 9

Ans 1:

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

Ans 2:

from ,
Class :

Ans 3:

from ,
Class :
9.6

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from ,
Subject :NSO    Class : Class 9

Ans 1:

from ,
Class :
The answer is 12cm

Ans 2:

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

Ans 3:

from ,
Class :
The answer is 12cm

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from ,
Subject :NSO    Class : Class 8

Ans 1:

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 2:

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

Ans 3:

The Address from Somaiya, Mumbai
Class : Class 6

Ans 4:

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

Ans 5:

Ananya from SGS , Trivandrum
Class : Class 5

Ans 6:

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

Ans 7:

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 8:

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

Ans 9:

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!

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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:

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

Ans 3: (Master Answer)

from ,
Class :
The correct answer is C.

Ans 4:

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

Ans 5:

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

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from ,
Subject :NSO    Class : Class 5

Ans 1:

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

Ans 2:

from ,
Class :
D

Ans 3:

from ,
Class :
D

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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:

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 2:

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

Ans 3:

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 4:

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 5:

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 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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 10:

from ,
Class :
cONFUSED IN d AND B

Ans 11:

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

Ans 12:

from ,
Class :
b

Ans 13:

from ,
Class :
b as Y expands more

Ans 14:

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

Ans 15:

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

Ans 16:

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 17:

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 18:

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

Ans 19:

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

Ans 20:

from ,
Class :
C is the correct answer

Ans 21:

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

Ans 22:

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

Ans 23:

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

Ans 24: (Master Answer)

from ,
Class :

Ans 25:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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 6:

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

Ans 7:

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

Ans 8:

from ,
Class :
WWWWRRRROOOONNNNNNNNNNGGGGGGGGGGGGGGGGG

Ans 9:

from ,
Class :
the answer will be 'A'

Ans 10:

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

Ans 11:

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

Ans 12:

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 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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 17:

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

Ans 18:

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 19:

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

Ans 20:

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

Ans 21:

Prabhav Kaushik from DPS Noida, Noida
Class : Class 10

Ans 22:

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

Ans 23:

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

Ans 24:

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

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from ,
Subject :NSO    Class : Class 3

Ans 1:

Varsha from Nps banashankari Bangalore, Bangalore
Class : Class 3
B

Ans 2:

from ,
Class :

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