National Science Olympiad Forum By SOF Olympiad Trainer - Page 525
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Debarpan Das from Delhi Public School , Durgapur
Subject :NSO    Class : Class 4

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

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

Ans 1:

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 2:

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 3:

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

Ans 4:

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

Ans 5:

Prabhav Kaushik from DPS Noida, Noida
Class : Class 10

Ans 6:

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

Ans 7:

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 8:

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

Ans 9:

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

Ans 10:

Avyukth Radhakrishnan from TSRS, Gurgaon
Class : Class 10
b

Ans 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

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.

Ans 15:

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

Ans 16:

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

Ans 17:

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 18:

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

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

Ans 1:

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

Ans 2:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 3:

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 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

ishaan from lvis, noida
Class : Class 6
c

Ans 15:

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 16:

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

Ans 17:

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

Ans 18:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

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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

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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:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

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

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

Ans 1:

Aryan Agarwal from Mayoor School, Noida
Class : Class 8

Ans 2:

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

Ans 3:

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 4:

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

Ans 5:

SJ HARITHA from PSNLO, BENGALURU
Class : Class 10

Ans 6:

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 7:

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

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

Ans 1:

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 2:

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

Ans 3:

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.

Ans 4:

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

Ans 5:

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 6:

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

Ans 7:

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

Ans 8:

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 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

atharv nila from VIBGYOR, Bengaluru
Class : Class 6

Ans 14:

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.

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

Ans 1:

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

Ans 2:

arnav from Dps noida, Delhi
Class : Class 8
a

Ans 3:

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 4:

Admin fly from Ddssxxx, Ax
Class : Class 1
A

Ans 5:

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

Ans 6:

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 7:

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 8:

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

Ans 9:

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

Ans 10:

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

Ans 11:

Admin fly from Ddssxxx, Ax
Class : Class 1

Ans 12:

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

Ans 13:

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

Ans 14:

Nandan Makineni from VIBGYOR HIGH, Bangalore
Class : Class 6

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