National Science Olympiad Forum By SOF Olympiad Trainer - Page 495
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Bidyashree Panda from Royal Concord International School Begur, Bangalore
Subject :NSO    Class : Class 4

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Rudra from VSPK international school sec -13 Rohini Delhi, Delhi
Subject :NSO    Class : Class 8

Ans 1:

Avanish Pandey from St Francis school , Bilaspur
Class : Class 9
The correct answer will be(a)

Ans 2:

Tay Wen Xuan from Inspiros International School, SHAH ALAM
Class : Class 9
Please explain what NA is... I don't understand

Ans 3:

Nipun Abhilash from National Public School, Banashankhari, Bangalore
Class : Class 9

Ans 4:

Akshara from NPS, Bengaluru
Class : Class 8
Arrows are marked wrongly...I dont think these mistakes will ever get rectified considering that people have been writing in this forum, for the past two years, for this question. please look into this sof🙂

Ans 5:

Saanvi from Dehli Public School , Gurugram
Class : Class 4

Ans 6:

Ruchi Sinha from DPS Gurgaon , Gurgaon
Class : Class 8

Ans 7:

Avanish Pandey from St Francis school , Bilaspur
Class : Class 9

Ans 8:

Ankit kumar Jha from Ryan International School , Ghaziabad
Class : Class 9
NA meant no answer is correct and we had to leave this one empty

Ans 9:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
what does NA mean?

Ans 10:

Avyukth Radhakrishnan from TSRS, Gurgaon
Class : Class 10
NA means 'No Answer'.But the guidelines clearly state 'Mark all questions.'How is this fair?

Ans 11:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7

Ans 12:

Karthik Rao Varam from Bala Vidya Mandir, Chennai
Class : Class 10

Ans 13:

Het Aryan from Podar International School , Pune
Class : Class 9
What the heck is going on.

Ans 14:

AANYA BARANWAL from KPS SCHOOL, bhilai
Class : Class 5
NA means no answer but what we had to do with it

Ans 15:

Naveen Kumar from Gail DAV Public School, Dibiyapur
Class : Class 8
PLEASE GIVE THE ANSWER ALONG WITH EXPLANTION

Ans 16:

HELEN ELDHO from MAR ATHANASIUS, KOOVAPPADY
Class : Class 9
why no reply...

Ans 17:

AKSHAJ SRIVASTAVA from MOUNT LITERA ZEE SCHOOL, Kanpur
Class : Class 9
None of the given options are correct...

Ans 18:

Akshara from NPS, Bengaluru
Class : Class 8
Yes , NA means 'no answer' So , since there is no such option , anything we pick would be incorrect.

Ans 19:

Mani Gupta from Carmel Convent School, Faridabad
Class : Class 9
Please explain the answer

Ans 20:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
if there is no answer,then why was it considered wrong?it is not fair.

Ans 21:

SUHANI PANDA from DE PAUL SCHOOL, BERHAMPUR
Class : Class 8
What do you mean by 'NA'?

Ans 22:

Anshuman D from MVM, Hyderabad
Class : Class 9
I understood that when I looked at the question itselfThe arrows are wrongly labelled

Ans 23:

Aniket Kumar from Gyan Niketan, Patna
Class : Class 8

Ans 24:

Karthik Rao Varam from Bala Vidya Mandir, Chennai
Class : Class 10

Ans 25:

Mridul Vashisht from St. Kabir Public School, Chandigarh
Class : Class 8
Woah how are the marks out of 60 then. People have already attempted this paper in the given year. This means an error in the paper was there that wasn't rectified...

Ans 26:

Jayadeep Shanmugam from Sri Sri Ravishankar Vidya Mandir, Bangalore
Class : Class 8
Please give the answer to this Question.

Ans 27:

Akshara from NPS, Bengaluru
Class : Class 8
Exactly.What does NA mean ??

Ans 28:

Suvan Shee from Chirec public school, Hyderabad
Class : Class 9
"NA"?.please explain the answer

Ans 29:

Ruchi Sinha from DPS Gurgaon , Gurgaon
Class : Class 8
NA? what is the explanation of the answer

Ans 30:

Ashvik Banerjee from Mount Litera Zee School , Vasco
Class : Class 9
What 'NA' ? The question itself is incorrect

Ans 31:

Abhijit from saint raphael h.s. school, indore
Class : Class 6

Ans 32:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
EXPLAIN THIS PLEASEQuestion is incorrect but even after 30 (31) posts and queries no corrections...

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Ashwak from Cambridge, Jalandhar
Subject :NSO    Class : Class 3

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Abhay Agarwal from St Francis School, Ghaziabad
Subject :NSO    Class : Class 8

Ans 1:

Abhay Agarwal from St Francis School, Ghaziabad
Class : Class 9
please explain this question

Ans 2:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
answer??????????????????????????????????????????????????????

Ans 3:

Bhramana Roy from Glendale Academy International, Hyderabad
Class : Class 8
Time taken to utter single syllable=1/5th of a sSpeed of sound in air=330m s^-1 or 330m/sso distance to reflecting surface=1/5 * 330 as that will give the distance=66.0mSo, distance to reflecting surface is 66.0m

Ans 4:

Prisha Hemchandra Lokhande from NPS Whitefield, Bangalore, Bangalore
Class : Class 8
Is the question wrong...? the answer should be 33.0 m as speed=2d/t

Ans 5:

Akhil Budithi from Kennedy high the global school , Hyderabad
Class : Class 8
please explain this question.

Ans 6:

Kabir Kaushik from Elpro International School, Pune
Class : Class 8
Yes I think it is 33 also because it says it is an echo

Ans 7:

vatsal jay gandhi from new era senior secondary school, Vadodara
Class : Class 8
please explain this question.

Ans 8:

Nilanjana De from Delhi Public School North, Bengaluru
Class : Class 8
Can someone please explain this question?

Ans 9:

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

Ans 10:

Darsh Singh from DAV, Talcher
Class : Class 8
Yes, it should be 33m as distance for an echo = s x t/2

Ans 11:

Ansuman Mohanty from O.D.M.Plubic School, Bhubaneswar
Class : Class 9

Post Your Answer

SAYAN MONDAL from BURDWAN CMS HIGH SCHOOL, BURDWAN
Subject :NSO    Class : Class 4

Ans 1:

Nakul Bhasker from National Public School Whitefield, Bangalore
Class : Class 5
THE ANSWER IS D AS FROG HAS 4 STAGES IN IT'S LIFE CYCLE ,BUT DOES NOT LOOK LIKE IT'S PARENT.WHILE,MOSQUITO HAS THREE SYTAGES IN IT'S LIFE CYCLE AND DOES NOT LOOK LIKE IT'S PARENT.I MADE THE SAME MISTAKE IN THE PREVIOUS TEST

Ans 2:

Kishore Kadiyala from NPS, BANGALORE
Class : Class 5
the answer is d as the mosquito does not look like the parent , has 3 stages of life and lays eggs while frog does not look like the adult , has 4 stages of life and lays eggs .

Ans 3:

Kishore Kadiyala from NPS, BANGALORE
Class : Class 5

Ans 4:

Shreshta from Presidium, Ghaziabad
Class : Class 3
The answer which is given in the SOF application is wrong, because a frog has four life stages in his life stages, the correct answer must be moth because it has only three life stages in his life cycle and the parent and child do not look same,

Ans 5:

Krish Karthik from freedom international school, Bangalore
Class : Class 5
but frog dosnt have just 3 life stages it has 4 so its not the answer

Ans 6:

Mihika Talukdar from GARDEN HIGH, KOLKATA
Class : Class 4

Ans 7:

Rishita Sivakumar from Indian High School, Karama Dubai
Class : Class 9
the answer is d

Ans 8:

Rishita Sivakumar from Indian High School, Karama Dubai
Class : Class 9

Ans 9:

LAVANYA DADHWAL from BLOOM PUBLIC SCHOOL, South West Delhi
Class : Class 9

Ans 10:

Akshat Pathak from DPS, Noida
Class : Class 4
correct answer is D

Ans 11:

Krishna Kumari Nayak from Sai International school , Bhubaneswar
Class : Class 4
It is option B

Ans 12:

Harsh Sobti from the samhita academy, BLR
Class : Class 5

Ans 13:

Nishchita from Gems Modern Academy , Dubai
Class : Class 8
The correct answer is C

Ans 14:

Manan thorat from Podar powai, Mumbai
Class : Class 4
Frog has 4 stages any of the answers are not correct

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Chiranjib kar from MOUNT LITERA ZEE SCHOOL, JAJPUR
Subject :NSO    Class : Class 5

Ans 1:

S A ANIRUDH from S B O A SCHOOL AND JUNIOR COLLEGE, CHENNAI
Class : Class 5
Answer is C

Ans 2:

Swastik Srivastava from Baldwin Boys High School, Bangalore
Class : Class 5
ans is B

Ans 3:

Bhavya from ABC, Delhi
Class : Class 7
super easy answer. it is 'A'

Ans 4:

Ajitesh Mishra from Vikas the concept school, Hyderabad
Class : Class 5
ANS A

Post Your Answer

Chiranjib kar from MOUNT LITERA ZEE SCHOOL, JAJPUR
Subject :NSO    Class : Class 5

Ans 1:

SUARGHYA CHATTERJEE from INDIA INTERNATIONAL SCHOOL, asansol
Class : Class 5
WHERE IS THE QUESTION!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!??????????????????????????????????????????????????????????????????????????????????!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!???????????????????????????

Ans 2:

Dushyant Singh from Shri Ram Centennial School, Indore
Class : Class 6

Ans 3:

Malav patel from Navrachana school sama , Vadodara
Class : Class 5

Ans 4:

Prisha Shah from Euroschool Airoli, Mumbai
Class : Class 6

Ans 5:

kushaal from bhartiya vidya bhavans public school vidhyasharam jublee hills , HYDERABAD
Class : Class 6
this is not a question

Ans 6:

Shreetej from Pearson public school, Pune
Class : Class 5
where is the question???????????????????????????

Ans 7:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5
The question is in the solution please check

Ans 8:

Reynah Gupta from The Shri Ram School, Aravali, Gurugram
Class : Class 10
question is incomplete

Ans 9:

Shreyan from Delhi Public School Bangalore East, Bangalore
Class : Class 5
what.

Ans 10:

sarah pranav gothivarekar from Indian School Al Gubra, Muscat
Class : Class 4
where is the questionnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn

Ans 11:

Ayushree Barman from Sri Sri Academy, Kolkata
Class : Class 6
Where is the question? Isn't it very vague?

Ans 12:

marika from VTS, Mumbai
Class : Class 4
There is no question and when I reported that error, it just came as "invalid"

Ans 13:

Aditi DasBidhar from Treamis World School, Bengaluru
Class : Class 6
Where is the question!?

Ans 14:

Prisha Shah from Euroschool Airoli, Mumbai
Class : Class 6
If they don't give the complete question, we all will get it wrongSOF please look into this matter

Ans 15:

Souradeepto Das Mandal from Hyderabad Public School, Hyderabad
Class : Class 7

Ans 16:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 9
What is the question?????????????????????????????????

Ans 17:

Kavin Karthick M from DPS bangalore east, Bengaluru
Class : Class 6
there is no proper question?

Ans 18:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5
report error

Ans 19:

Siddhanth Subramanian from Global Indian International School , Singapore
Class : Class 7
question????????????????

Ans 20:

Jasmine Kaur from Venkateshwar International School , New Delhi
Class : Class 5
There is no question!

Ans 21:

Dushyant Singh from Shri Ram Centennial School, Indore
Class : Class 6
no question.report error please

Ans 22:

Kashvi Rawat from Gear Innovative International School, Bengaluru
Class : Class 3
no question!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 23:

Samyuktha from Sri Chaitanya, Chennai
Class : Class 7
they did not give the question .

Ans 24:

Pratham Dave from GNS, Bangalore
Class : Class 7
No question?????????????????????????????

Ans 25:

Ashwak from Cambridge, Jalandhar
Class : Class 9
question is incomplete

Ans 26:

Etash M B from Sri Sri Ravi Shankar Vidya Mandir, Bengaluru
Class : Class 5
where the h

Ans 27:

Dushyant Singh from Shri Ram Centennial School, Indore
Class : Class 6
see the solution the question is how many kharif crops are there. there are 6.

Ans 28:

Shaanvi from ,
Class : Class 5
wrong question, incompleted question!!!!!!!!!!!!!????

Ans 29:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4

Ans 30:

Mahadevan from KV Rubber Board Kottayam, Kottayam
Class : Class 9
No relevant question

Ans 31:

Shreyasi Padihary from The Cambridge International School , Bangalore
Class : Class 7
There is no question. What are we supposed to answer. It is incomplete

Ans 32:

Arnav kaul from Chirec, Hyderabad
Class : Class 2

Ans 33:

Swastik Srivastava from Baldwin Boys High School, Bangalore
Class : Class 5
where is the question ??????????????????

Ans 34:

Mishika shah from little angels high school, gwalior
Class : Class 9
The question is there in the solution please check

Ans 35:

Chandradeep Kumar from ,
Class : Class 5

Ans 36:

Suvanjot Kaur from Springdale Senior School, Amritsar
Class : Class 5
The question is incomplete

Ans 37:

Kanishk Mukherjee from BDM International, Kolkata
Class : Class 6

Post Your Answer

Shreenath Rajesh Nair from J H A S V Surat, Surat
Subject :NSO    Class : Class 8

Ans 1:

S V Harini from Vailankanni public school , Krishnagiri
Class : Class 8
explain please....

Ans 2:

vrrsekar from INDIAN SCHOOL SUR OMAN, sur
Class : Class 6
Thank You Mr.Rahul

Ans 3:

ANUSHKA SHARMA from CAMBRIDGE COURT WORLD SCHOOL, JAIPUR
Class : Class 8
Please explain how the deviation has happened at 180 degrees

Ans 4:

Shaman Amin from SDM school, Mangalore
Class : Class 10
But wont the refraction of light in water play a role?

Ans 5:

NAMAN HARITASH from DPS DLF CITY, GURGAON
Class : Class 9
but due to water refraction will also take place

Ans 6:

neelu desai from bombay scottish, mumbai
Class : Class 8

Ans 7:

Khushi Chaudhuri from Step By step, Noida
Class : Class 8
Why does the deviation happen to be 180 degrees

Ans 8:

Rahul Jha from Delhi Public School BN, Bengaluru
Class : Class 8
Key Idea: Phenomenon of reflection is independent of medium. The deviation produced by combination of two plane mirrors is δ=2π−2θ =2π−2×π2 (θ=90o) ⇒ δ=π=180o. Hence, total deviation in incident ray is180o

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H R Kanish from Chennai public school, Chennai
Subject :NSO    Class : Class 6

Ans 1:

Advait talnikar from Dhruv Global School, Sangamner
Class : Class 6
Answer can be A

Ans 2:

Ayush malik from JAI KRAISHANA INTERNATIONAL SCHOOL, Rohtak
Class : Class 6
D

Ans 3:

Kushal from Chirec, Hyderabad
Class : Class 7

Ans 4:

Alyassa Pradhan from St Josephs Convent Higher Secondary School, Sambalpur
Class : Class 4
D

Post Your Answer

H R Kanish from Chennai public school, Chennai
Subject :NSO    Class : Class 6

Ans 1:

PS Gour from Chirec international schoo The best 30 years and beyond, Hyderabad
Class : Class 7
according to me D is correct

Ans 2:

Ashi Goyal from Sacred heart convent school,raikot road,barnala, punjab
Class : Class 6

Ans 3:

Shabd Mehta from Shabd Mehta, Agra
Class : Class 7
How many times will olympiad confuse us its D

Ans 4:

Smita De from Bishop Cotton Girls School, BANGALORE
Class : Class 6

Ans 5:

SJ HARITHA from PSNLO, BENGALURU
Class : Class 10

Ans 6:

SOURADEEP SHARMILA MANDAL from KENDRIYA VIDYALAYA IISC, Bengaluru
Class : Class 7

Ans 7:

BHAVYA JHA from GLOBAL CITY INTERNATIONAL SCHOOL, BANGALORE
Class : Class 6
According to me D is the correct answer

Ans 8:

MAHI ABHIJIT CHAUDHARI from Sentia The Global School, HYDERABAD
Class : Class 6
Answer B is the correct answer as the question specified for the arrangement which will allow the bulb to stay lighted for the longest possible time. Option B is connected as One cell as per the circuit (all connections are in parallel), While Option D is in Series (in case of failure of one cell, the circuit will not work as the current will not pass through the cell)

Ans 9:

Aayush Reddy Bomidika from Delhi Public School Nacharam, Hyderabad
Class : Class 9
D is definitely the correct answer

Ans 10:

Pranav Kartik from DPS sushant lok , Gurgaon
Class : Class 3
D is the correct answer

Ans 11:

Shantaneel Sarkar from Delhi Public School, Nagpur
Class : Class 6
According to me D is the correct answer as a wire should be connected from a terminal of a battery to the - terminal of the battery for longer stay of electric circuit, and this rule is satisfied by the circuit shown in option D.

Ans 12:

SUSHEELA KAMLENDRA from FLORENCE ACADEMY, BENGALURU
Class : Class 6

Ans 13:

Naitik Mundra from International School Rheintal, Buchs Sankt Gallen
Class : Class 9
Answer is B

Ans 14:

Kaustav Bhowal from Julien Day School, Kolkata
Class : Class 10
D is the correct answer.

Ans 15:

Harsh Kedawat from Apeejay, Noida
Class : Class 8
pls explain how the answer is B

Ans 16:

Kshitij from Sams, Bangalore
Class : Class 6
pls explain how the answer is bBTW: your answer is correct

Ans 17:

Ayush malik from JAI KRAISHANA INTERNATIONAL SCHOOL, Rohtak
Class : Class 6
D

Ans 18:

Hemanshu VM from Sri Kumaran Public School, Bangalore
Class : Class 6
the answer is D

Ans 19:

Pranjal Chaudhari from St Aloysius Convent High School, Bhusawal
Class : Class 6
pls explain how the answer is B

Ans 20:

Naitik Mundra from International School Rheintal, Buchs Sankt Gallen
Class : Class 9
When a battery is constructed such that all the positive terminal of the cells are connected to a same point and all the negative terminals of the cells are connected to another point then the grouping of cells in this manner is called the Parallel Grouping of cells. The two end terminals of the construct where all the positive and negative terminals of the cells are connected act as the corresponding terminal of the battery.

Ans 21:

Kushal from Chirec, Hyderabad
Class : Class 7

Ans 22:

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

Ans 23:

Shourya Kumar from Delhi Public School Noida, Noida
Class : Class 9

Ans 24:

Aarav Srivastav from DWPS , Noida Extension
Class : Class 7

Ans 25:

Aarav Srivastav from DWPS , Noida Extension
Class : Class 7

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