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

User Forum

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

The Address from Somaiya, Mumbai
Class : Class 6

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.

Post Your Answer

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

Two electroscope one positively charged (X) and the other negatively charged (Y) are connected with a copper wire as shown in figure. Which of the following will happen?


A Electrons will move from X to Y.
B Protons will move from X to Y.
C Electrons will move from Y to X.
D Protons will move from Y to X.


pls somebody tell me the answersplease,please,pppppppppllllllllllleeeeeeeeeeeeaaaaaaaaaaassssssssssssseeeeeeeee

Ans 1:

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

Ans 2: (Master Answer)

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

Post Your Answer

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:

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

Ans 3:

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

Post Your Answer

from , Kolkata
Subject :NSO    Class : Class 4

Ans 1:

neha garg from Lancer convent school, new Delhi
Class : Class 4
B

Post Your Answer

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.

Post Your Answer

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

Ans 1:

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

Ans 2:

Hitanshi Behera from Loyola School , Bhubaneswar
Class : Class 4
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

Ans 3:

Aarnav Grover from Calorx olive international school, Ahmedabad
Class : Class 5
d

Ans 4:

Abhisyant M Baruah from DPS Bangalore East, Bengaluru
Class : Class 7
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 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:

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

Ans 7:

Arnav kaul from Chirec, Hyderabad
Class : Class 5

Ans 8:

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

Ans 9:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 6
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 10:

Ashmi Narkar from VIBGYOR HIGH , Airoli, Navi Mumbai, NAVI MUMBAI
Class : Class 5
B because if Y expands and X contracts, X will be a lot smaller than Y. Here, both are almost the same size.

Ans 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

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 15:

ayush from kv no.1 dhanbad, Dhanbad
Class : Class 8
B

Ans 16:

shubhavi Dhondge from NPS, Banagalore
Class : Class 5
B is the answer

Ans 17:

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

Ans 18:

Shrija Roy from Ryan international school icse, mumbai
Class : Class 6

Ans 19:

arya navare from Saint ursula school, kankavli
Class : Class 5

Ans 20:

Prajjwal Dey from MLZS Wakad, PUNE
Class : Class 5

Ans 21:

Pratham Dave from GNS, Bangalore
Class : Class 6
B is the answer to this question

Ans 22:

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

Ans 23:

Sumit Singhal from Cambridge Court World School, JAIPUR
Class : Class 7
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

Post Your Answer

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

The diagram shows a beaker containing a solution of zinc sulphate and two carbon electrodes. A battery is placed next to it. In order that the electrode P be plated with zinc,


A P must be connected to S and Q to R
B P must be connected to Q and S to R
C P must be connected to R and Q to S
D P and Q must be connected to R.


The answer would be a as znso4 wold breakdown into zn 2and so42-ions .the zn 2 would be attracted towards cathode(negative terminal) so p would be attached to negative terminal and therefore the answer is a.

Ans 1:

Riya Singhani from BVB vidhyashram, jaipur
Class : Class 8
WWWWRRRROOOONNNNNNNNNNGGGGGGGGGGGGGGGGG

Ans 2:

bipasana from KV IIT Kanpur, Kanpur
Class : Class 8
It has to be A.

Ans 3:

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

Ans 4:

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

Ans 5:

Sounak halder from Kendriya Vidyalaya Cossipore, kolkata
Class : Class 8
the answer will be 'A'

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 8
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 10:

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

Ans 11:

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 12:

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

Ans 13:

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

Ans 14:

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 15:

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

Ans 16:

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

Ans 17:

tamojit das from techno India Group Public School , Chinsura
Class : Class 8
cation(Zn2 ) must be deposited to the cathode.

Ans 18:

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

Post Your Answer

H KRITHIK from kendriya vidyalaya, chennai
Subject :NSO    Class : Class 3

A note is shown here which Ravi has made about different types of house. Unfortunately when he had finished writing, some ink spilt over the page and covered some of the key words.
A wooden house made on a boat is called . It is common in Kashmir and . In areas with heavy rainfall houses are common. are built of snow and are found in very cold countries.
Select the correct sequence of hidden words to complete the note.

A Caravan, Rajasthan, Tent, Igloos
B Houseboat, Kerala, Stilt, Igloos
C Houseboat, Delhi, Kutcha, Igloos
D Tent, Karnataka, Caravan, Igloos

Ans 1:

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

Ans 2:

Dishen dharmenra patel from Anand niketan to the satellite , Ahmedabad
Class : Class 3

Post Your Answer

from , Kolkata
Subject :NSO    Class : Class 7

Ans 1:

Medha Bhutani from Christ Academy, Bengaluru
Class : Class 9
ans is c

Post Your Answer

from , Kolkata
Subject :NSO    Class : Class 7

Ans 1:

Sriyansh from Surabhi , Hosapete
Class : Class 9
Plug key is also a type of switch.

Post Your Answer