National Science Olympiad Forum By SOF Olympiad Trainer - Page 617
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Hiyansh Jain from Podar International School, Mumbai
Subject :NSO    Class : Class 5

Ans 1:

Aarnav Grover from Anand Niketan Shilaj, Ahmedabad
Class : Class 9
b easy

Ans 2:

Pratham Dave from GNS, Bangalore
Class : Class 7
Yes AREEN , THE ANSWER IS B

Ans 3:

AREEN from BOLTON, HYDERABAD
Class : Class 6
Ans is B because Iron rod does not break when hit and it can't be stretched, rubbber band does not break when hit but it can be stretched, ceramic tile breaks when hit but does not allow light to pass through, and spectacle lens break when hit and allow light to pass through.

Ans 4:

Anirva Dhote from R J Chaware Convent, KARANJA
Class : Class 7
very very very easy answer is B

Ans 5:

Pratham Dave from GNS, Bangalore
Class : Class 7
Yes AREEN , THE ANSWER IS B

Ans 6:

VISHNU from NARAYANA OLYMPIAD GOPALAPURAM, chennai
Class : Class 5

Ans 7:

Aarush from Podar, Mumbai
Class : Class 10
the widow pane would be elastic

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

Ans 1: (Master Answer)

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

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Subject :NSO    Class : Class 6

Ans 1:

Deepesh Abhijeet Gurjar from Sulochana Natu Bharatiya Vidya Bhavan , Pune
Class : Class 9

Ans 2:

Ryan Geo from Birla Public School, DOHA
Class : Class 7
As far as I know, raining (precipitating) does not yield clouds. condensation does.

Ans 3:

Kushagra Kishore from Chrysalis High, Bengaluru
Class : Class 10

Ans 4:

Deepesh Abhijeet Gurjar from Sulochana Natu Bharatiya Vidya Bhavan , Pune
Class : Class 9
Actually,water does not ''Precipitate'' to form clouds.As long as my memory tells me, water ''Condenses'' to form clouds.

Ans 5:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
yes a is the correct answer

Ans 6:

Naman from Svm, Nalasopara
Class : Class 6
a is write

Ans 7:

Snigdha swaminath from Christ nagar higher secondary school , Trivandrum
Class : Class 7
D is right too right

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Aarush Singh from The Study Lecole Internationale, Puducherry
Subject :NSO    Class : Class 5

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Subject :NSO    Class : Class 6

Ans 1:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
correct answer is B

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Chinmayi.D.S from Podar International School, Hassan
Subject :NSO    Class : Class 8

Ans 1:

karthik from , tirupur
Class : Class 8
Venus

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Nilanjana De from Delhi Public School North, Bengaluru
Subject :NSO    Class : Class 7

Ans 1:

ARNAV BARANWAL from KPS SCHOOL, bhilai
Class : Class 4
wrong question

Ans 2:

Koina Rautkar from DAV ispat sr sec public school , Dalli rajhara
Class : Class 7

Ans 3:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8

Ans 4:

yash kirpalani from st gregorios high school chembur, Mumbai
Class : Class 7
none of the options are correct.

Ans 5:

Adhrit from CHSV, Chennai
Class : Class 8
Completely wrong image in the question, it makes no sense

Ans 6:

Ahaan Pathak from Treamis World School, Bangalore
Class : Class 8
This question is absolutely wrong

Ans 7:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
Firstly, the image itself is totally different from that of the options. None of the options actually fit the image. So, either there should be a "None of these" option or there should be a different image in which at least one option fits. I ask SOF to kindly make the needed changes.

Ans 8:

Ishan Patil from D.A.V. B.O.R.L. Public School ,Bina, Bina
Class : Class 9
Absolutely Right question matches with the image in question

Ans 9:

arnav raj sharma from gulibulium school, new york
Class : Class 8
THAT DOESN'T MAKES SENSE

Ans 10:

PS Gour from Chirec international schoo The best 30 years and beyond, Hyderabad
Class : Class 7
this is wrong

Ans 11:

Harsh Kakaria from The creek planet school, Hyderabad
Class : Class 8
it is completely wrong

Ans 12:

Anuraaj Salunkhe from St Gregorios High School, Mumbai
Class : Class 10
None of the options are correct.

Ans 13:

Arnav Nandan from ST PETERS COLLEGE AGRA, Agra
Class : Class 9
Wrong question. NICE

Ans 14:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
this is wrong . all the options are wrong .

Ans 15:

Anusha from LBS School , Kota
Class : Class 10
Wrong question

Ans 16:

Anshuman D from MVM, Hyderabad
Class : Class 9
It is meaningless

Ans 17:

Daksh from RKC, Rajkot
Class : Class 8

Ans 18:

Mahadevan from KV Rubber Board Kottayam, Kottayam
Class : Class 9
yes wrong ques

Ans 19:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7

Ans 20:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8
Senseless question, wrong question and totally different solution. I am disappointed as there are many mistakes.

Ans 21:

Kushal from Chirec, Hyderabad
Class : Class 7

Ans 22:

Neil Pathak from GD Goenka Public School, Paschiim Vihar, New Delhi
Class : Class 9
wrong ques

Ans 23:

Aahana from St. Andrews School, Hyderabad
Class : Class 7
Wrong Question

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Gauri Chaturvedi from St. Joseph Convent, Jabalpur
Subject :NSO    Class : Class 6

Ans 1:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
AN INSULATOR (C)

Ans 2:

VIJAYA SREYAS B from NARAYANA OLYMPIAD SCHOOL KUKATPALLY, HYDERABAD
Class : Class 6
Wood is a bad conductor of heat. This results in very slow heating of wood. This principle is used when we use wood utensils to cook food. I go by option (B).

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Mathangi Parthasarathi from ,
Subject :NSO    Class : Class 4

Ans 1:

Prakriti Singh from Ryan International School, Pune
Class : Class 4
D I guess,I am not sure

Ans 2:

Shreyansh Saha from Dps Megacity, Kolkata
Class : Class 5
Option D

Ans 3:

Aayush Reddy Bomidika from Delhi Public School Nacharam, Hyderabad
Class : Class 9

Ans 4:

Nidhesh Agarwal from Chinmaya vidyalaya, Bokaro steel city
Class : Class 4

Ans 5:

Aarav from SNBP, Pune
Class : Class 4
plants can release carbon dioxide at night only tulsi plant does not release carbon dioxide

Ans 6:

Shaurya Srivastava from delhi public school, navi mumbai
Class : Class 6
how can a plant release carbondioxide???

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Mrs Punita from Ramjas school R.K.Puram, New Delhi
Subject :NSO    Class : Class 7

Ans 1:

Krishna Patidar from Advanced Academy, Indore
Class : Class 8
No, the answer is 'C' only. In pupa stage the silk fiber is only obtained, but actually it is produced by larva and in question it is asked which stage produces fiber. Hence, the answer is 'C".

Ans 2:

Sanjaykumar S from Velammal, chennai
Class : Class 7
ans:c,you may think d,but only in larval stage it produce silk in option d it is in a cocoon stage it cannot produce silk

Ans 3:

Shlok from Tomoae , Amravati
Class : Class 7
it must be c . at cocoon stage silk is already produced

Ans 4:

Aviral Yadu from Krishna Public School Dunda Raipur, Raipur
Class : Class 9
Ans C

Ans 5:

Parth Gupta from Presidium Gurgaon, Gurgaon
Class : Class 8
answer is c because in the pupa stage the silk is already produced and in the larvae stage it produces silk when it is ready to go in the next stage of its life

Ans 6:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
I THINK THE ANSWER IS C

Ans 7:

Arushi from Indira National School, Pune
Class : Class 9
also felt d but explanation provided above makes me feel c

Ans 8:

Ryan Ganguly from Ebenezer International School, Bangalore
Class : Class 8
The answer is C as at that time of a Silkworms life it will produce silk. With that silk they will make a cacoon and then they will become a Moth. While it is a Pupa it does not have the ability to make Silk hence the answer is C

Ans 9:

Bhumi Chheda from SVKM J V Parekh International School, Mumbai
Class : Class 9
it is c because the silk has already started getting produces when it is larva

Ans 10:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
really confusing ... the answer option d is correct in the sense that produces means extracting the silk or when it is ready to extracted by humans. but option c is correct when produces means that when larva , itself after the fourth moult stage produces silk.

Ans 11:

Yashna Badiye from sagar public school saket nagar, Bhopal
Class : Class 8
no it is c

Ans 12:

Hritvi from Podar International School, Mumbai
Class : Class 7
OPTION C

Ans 13:

D VISHNU from NARAYANA SCHOOL, CHENNAI
Class : Class 7
the answer is d only in the cocoon stage they are heated in the hot water so that the reproducing caterpillar will die and it will be very easy to extract silk fiber from it.

Ans 14:

Aayush Reddy Bomidika from Delhi Public School Nacharam, Hyderabad
Class : Class 9

Ans 15:

Yashna Badiye from sagar public school saket nagar, Bhopal
Class : Class 8
as larva produces and when it is fully produced it forms a cocoon

Ans 16:

reechik ghosh from dps, farakka
Class : Class 7

Ans 17:

Mradul from Modern public school bhiwadi, Bhiwadi
Class : Class 7
IT IS 'D' BECAUSE AT COCOON STAGE THE CATERPILLAR PRODUCES SILK FIBRES AND KNOTS AROUND IT AND COVERS HIMSELF.AFTER SOME TIME THE SILK FIBRES GETS HARDEN DUE TO THE GUMMY SUBSTANCE WHICH THE CATERPILLAR PRODUCES............IT IS CALLED "FIBROIN" WHICH IS MADE UP OF PROTEINS.ON HEATING THE COCOONS IN WATER THE SILK AGAIN BECOMES SOFT AND IS EXTRACTED FROM COCOONS........THIS PROCESS IS CALLED "REELING OF SILK"

Ans 18:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
I thought the silk is obtained from the cocoon

Ans 19:

AARAV AGRAWAL from BIRLA DIVYA JYOTI, SILIGURI
Class : Class 8
This is a trick question.. It says 'produced', not 'obtained'.. The larvae produce the silk fibre, then it is obtained from cocoon..

Ans 20:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Answer should be C ,as only larvae in the life cycle of moth produce silk fibres , pupa or cocoon does NOT make silk fibres . They only undergo change in stage IN the silk fibres. They do not have the ability to produce silk fibres !

Ans 21:

Ronav Kerkar from Jamnabai Narsee School, Mumbai
Class : Class 7
admin please answer

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