National Science Olympiad Forum By SOF Olympiad Trainer - Page 526
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Debarpan Das from Delhi Public School , Durgapur
Subject :NSO    Class : Class 4

Ans 1:

Madhuri P from ,
Class : Class 4
you need to specify if waning or waxing crescent

Ans 2:

Jayanth from The Deens Academy, Bengaluru
Class : Class 4
You have to specify if waxing or waning crescent

Ans 3:

Tejesh VB from GEMS New Millennium School, Al Khail, Dubai
Class : Class 8

Ans 4:

Virat from K l international, Meerut
Class : Class 5
You need to specify whether it is a waxing or waning crescent.

Ans 5:

Vedang Siddharth Thakare from SMT's Saraswati English Medium School., Thane
Class : Class 4

Post Your Answer

yagna from DPS, Surat
Subject :NSO    Class : Class 8

Ans 1:

Advait talnikar from Dhruv Global School, Sangamner
Class : Class 6
The answer should be B as it will be closed circuit

Ans 2:

Nilanjana De from Delhi Public School North, Bengaluru
Class : Class 8
The answer key says that X will not light up,but why?

Ans 3:

Kingshuk Gupta from RN Podar school, Mumbai
Class : Class 9

Ans 4:

Vaidheesh Bharadwaj from NPS, Bangalore
Class : Class 7
I too am confused as current will also flow through both the bulbs when circuit is closed. It will pass through the switch first and hence lighting up bulb Y.

Ans 5:

Vishwanath Halkeri from sudarshan vidya mandir, Bangalore
Class : Class 8

Ans 6:

AANYA BARANWAL from KPS SCHOOL, bhilai
Class : Class 5
answer should be B

Ans 7:

Prabhav Kaushik from DPS Noida, Noida
Class : Class 10

Ans 8:

Avyukth Radhakrishnan from TSRS, Gurgaon
Class : Class 10
b

Ans 9:

Abhay Agarwal from St Francis School, Ghaziabad
Class : Class 9
yes i too did B

Ans 10:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb is correct as current will flow though X but I do feel that current will prefer less resistant path so D can also be correct

Ans 11:

Akshay Malhan from NHSS, Thane
Class : Class 8
logically it should be B but sof says otherwise. why ????

Ans 12:

Dev Rawat from R D Rajpal School, New Delhi
Class : Class 8
The answer is B

Ans 13:

Triguna from Kendriya Vidyalaya No.1 Salt Lake, Kolkata
Class : Class 8
X will light up... I think it's incorrect....

Ans 14:

SaiKrishna from Chettinad Vidyashram, Chennai
Class : Class 3
Option D is correct because current prefers the path that offers less resistance. The bulb provides resistance whereas the switch when closed does not. Hence correct answer is D

Ans 15:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
answer should be b because X will also lit up

Ans 16:

Priyanshi from Delhi Public School Agra, Agra
Class : Class 9
Yess,my answer was B also

Ans 17:

Yatharth Agrawal from Indira National school, Pune
Class : Class 8
It must be B.The current finds a more direct path to Y, Making it brighter.But the current still reaches X because there is still a path. SOF Says otherwise.

Ans 18:

vatsal jay gandhi from new era senior secondary school, Vadodara
Class : Class 8
Please explain it. I am also confused about the answer. I myself did B.

Post Your Answer

DIKSHIT SUNDAR from vidhysaram, chennai
Subject :NSO    Class : Class 5

Ans 1:

Ujjwal Upadhyay from Navy Children school, Vasco
Class : Class 6
The answer is d

Ans 2:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 3:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 4:

Aaditya Malhotra from Isaac Newton Global School, Mumbai
Class : Class 3
D

Ans 5:

Hitarth Bhardwaj from Teoler High School, Jaipur
Class : Class 6
Veer Sehrawat, how c, the question says which town is located near an unpolluted river not a polluted river.

Ans 6:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
Sorry , my brother changed the C into D . It should be C only !

Ans 7:

FAIZAN HUSSAIN from SYED ABID HUSSAIN SR. SEC. CHOOL (MIDDLE SECTION), DELHI
Class : Class 4
Low High Many Many

Ans 8:

shivan iyer from dr pillai global academy, MUMBAI
Class : Class 4
d

Ans 9:

Rishit Garg from Bhavan s B P Vidya Mandir , Nagpur
Class : Class 9

Ans 10:

Sumit Biswal from Dps gandhinagar, Gandhinagar
Class : Class 7
I was a bit confused between C and D

Ans 11:

ishaan from lvis, noida
Class : Class 6
c

Ans 12:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
It is a very serious thing for us that we are getting wrong answers from SOF . It should be D only !

Ans 13:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
no chart no answer

Ans 14:

Anantjit Chander from Apeejay School, Sector 15, Faridabad
Class : Class 10
Sorry all, I had not read the question well.😞😞

Ans 15:

Hitanshi Behera from Loyola School , Bhubaneswar
Class : Class 4
ans is D so easy

Ans 16:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 17:

Anantjit Chander from Apeejay School, Sector 15, Faridabad
Class : Class 10

Ans 18:

Suhani from DPSG, Modinagar
Class : Class 9
The answer is c

Post Your Answer

Debarpan Das from Delhi Public School , Durgapur
Subject :NSO    Class : Class 4

Ans 1:

Ibrahim Aslam from uttam, Ghaziabad
Class : Class 6
NA

Ans 2:

ishit from EUROSCHOOL THANE, THANE WEST
Class : Class 7

Ans 3:

AHANA BAG from DELHI PUBLIC SCHOOL JOKA SOUTH KOLKATA, KOLKATA
Class : Class 9

Post Your Answer

Debarpan Das from Delhi Public School , Durgapur
Subject :NSO    Class : Class 4

Post Your Answer

Debarpan Das from Delhi Public School , Durgapur
Subject :NSO    Class : Class 4

Ans 1:

Tejesh VB from GEMS New Millennium School, Al Khail, Dubai
Class : Class 8

Ans 2:

Ibrahim Aslam from uttam, Ghaziabad
Class : Class 6
What is mimicry?

Ans 3:

SIDDHARTH KUMAR CHATTERJEE from NAVY CHILDREN SCHOOL , CHICALIM
Class : Class 7
Mocking or copying.

Ans 4:

Ibrahim Aslam from uttam, Ghaziabad
Class : Class 6
😓😓copying

Post Your Answer

aadin josefina from sorsfort international school,
Subject :NSO    Class : Class 4

Post Your Answer

Sargah Surya from bgsnps, Bengaluru
Subject :NSO    Class : Class 6

Ans 1:

Prathamesh Raje from DPS Electronic City, Bangalore
Class : Class 9

Ans 2:

Pragyan Srivastava from Manipal Public School, Lucknow
Class : Class 10
The correct and is D as the magnetic field moves from North to south

Ans 3:

Stuti Chakroborty from Jain Heritage School, Bangalore
Class : Class 6

Ans 4:

Prathamesh Raje from DPS Electronic City, Bangalore
Class : Class 9

Ans 5:

SJ HARITHA from PSNLO, BENGALURU
Class : Class 10

Ans 6:

Aarushi Upadhyayula from The Cambridge International School, Bengaluru
Class : Class 7
The answer D is correct. Magnetic field moves from North to South, and if you follow the direction of the compasses, you will see that this theory is true.

Ans 7:

Aryan Agarwal from Mayoor School, Noida
Class : Class 8

Post Your Answer

MARIA K PAUL from DON BOSCO SCHOOL OF EXCELLENCE EGMORE, CHENNAI
Subject :NSO    Class : Class 6

Ans 1:

aritroray from Chirec International School, Hyderabad
Class : Class 8
I think it should be C because otherwise the zero end can shift slightly (in our viewpoint) and measurement will be wrong. So both statements a and b are correct and the answer is C.

Ans 2:

Rithvik Chandra from Greenwood High School, Bangalore
Class : Class 6
this is basic 6th grade physics, you cannot always be measuring 0cm, so as to avoid parallax error your eye must be placed right above the scale, if you do not beleive me ask your science/physics teacher. Hence it is A.

Ans 3:

atharv nila from VIBGYOR, Bengaluru
Class : Class 6

Ans 4:

PARNIKA SINGH from GYAN GANGA EDUCATION ACADEMY, RAIPUR
Class : Class 10
GIVEN ANSWER IS NOT CORRECT AS A IS THE CORRECT ANSWER

Ans 5:

sujata patel from Podar International, Pune
Class : Class 6
cccccccccccc

Ans 6:

from , Jajpur
Class : Class 6
the answer will be both a and b

Ans 7:

Subhang Deep Sahu from Narayana CO Kadugodi Bangalore, Bangalore
Class : Class 8

Ans 8:

PARNIKA SINGH from GYAN GANGA EDUCATION ACADEMY, RAIPUR
Class : Class 10

Ans 9:

sujata patel from Podar International, Pune
Class : Class 6
it is simple that while measuring, at first you eye must be vertically above 0

Ans 10:

chittaranjan kar from MLZS, Jaipur
Class : Class 3
No guys. Human eye can't focus simultaneously on two points. To avoid parallax error , eye should be on the point of measurement to be taken.Hence given answer is correct in my view. You may comment.

Ans 11:

Anushka Srivastava from Cjm, Dehradun
Class : Class 7
no because what will u do of zero u have to

Ans 12:

Mansi Sadavarti from Vibgyor High, Pune
Class : Class 7
I agree with Aritroray the answer should be C

Ans 13:

AUSTIN from Viswajyothi CMI Public School, Chowara
Class : Class 7
i think its C

Ans 14:

Rahil from Delhi Public School Faridabad, Faridabad
Class : Class 7
No as it causes a parallax error. It should be option A. If you don't believe me then try it yourself with a scale and measuring a line segment from different eye positions. You will see that, the measurement varies slightly every time. That's why option A is correct.

Post Your Answer

Sargah Surya from bgsnps, Bengaluru
Subject :NSO    Class : Class 6

Ans 1:

ttraj from KV IIT, Chennai, Chennai
Class : Class 3
A

Ans 2:

Ishir Jha from Gyan Ganga Global Academy, Rosera
Class : Class 8

Ans 3:

Nandan Makineni from VIBGYOR HIGH, Bangalore
Class : Class 6

Ans 4:

Bhavtosh Tripathi from Maneckji Cooper Education Trust School, Mumbai
Class : Class 9

Ans 5:

Vasu tyagi from St Joseph's High school, Panvel
Class : Class 6
Sachin is being tested for his eyesight by an optician.Now, let’s read the given information carefully, and find out the position of Sachin.Sachin sits 3 m in front of a plane mirror, and looks at the image of the chart of letters, which seems to be 7 m in front of him.This means the distance between the mirror and the image of the chart is (7 m – 3 m = 4 m). If the image of the chart is 4 m behind the mirror, then the actual chart is placed 4 m in front of mirror.Now the chart is placed 4 m in front of the mirror, and Sachin is sitting 3 m in front of the mirror. That means the chart is placed (4 m – 3 m = 1 m) behind Sachin. Hence, the right answer is Option A.

Ans 6:

Admin fly from Ddssxxx, Ax
Class : Class 1

Ans 7:

arnav from Dps noida, Delhi
Class : Class 8
a

Ans 8:

Prathamesh Raje from DPS Electronic City, Bangalore
Class : Class 9

Ans 9:

Vasu tyagi from St Joseph's High school, Panvel
Class : Class 6
Sachin is being tested for his eyesight by an optician.Now, let’s read the given information carefully, and find out the position of Sachin.Sachin sits 3 m in front of a plane mirror, and looks at the image of the chart of letters, which seems to be 7 m in front of him.This means the distance between the mirror and the image of the chart is (7 m – 3 m = 4 m). If the image of the chart is 4 m behind the mirror, then the actual chart is placed 4 m in front of mirror.Now the chart is placed 4 m in front of the mirror, and Sachin is sitting 3 m in front of the mirror. That means the chart is placed (4 m – 3 m = 1 m) behind Sachin. Hence, the right answer is Option A.

Ans 10:

Aarohi Srihari Torgal from V.V.S B.M Sri Educational Institutions , Mysure
Class : Class 6
A

Ans 11:

Rahil from Delhi Public School Faridabad, Faridabad
Class : Class 7
A as image is as far behind the mirror as Object is in front of it. In this case Sachin is 3 m in front of the mirror and the object seems to be seven meters ahead. As Sachin is 3 m in front of the mirror that means object is (7-3) = 4 m behind the mirror. As image is as far behind the mirror as Object is in front of it, It means chart is 4 meters in front of the mirror. ( 4 - 3 ) = 1 m behind Sachin as Sachin is also in front of the mirror. Hope that answers your question !

Ans 12:

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi
Class : Class 7

Ans 13:

Pragyan Srivastava from Manipal Public School, Lucknow
Class : Class 10
A

Ans 14:

Admin fly from Ddssxxx, Ax
Class : Class 1
A

Post Your Answer