National Science Olympiad Forum By SOF Olympiad Trainer - Page 355
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Ritabrata Das from OPJS, Angul
Subject :NSO    Class : Class 6

Ans 1:

rethish from Veltech, Avadi
Class : Class 3
Reversible changes are those changes which can be reversed back again and they can be called as temporary. Irreversible changes are those changes which can't be turned back or they're permanent changes.After burning a candle, it is not possible to restore the original candle in order to burn it again. So, (1) is an irreversible change. Extinguished candle (2) is a reversible change, because an extinguished candle can be lighted again.Melting wax (3) is also a reversible change, because the melted wax will turn to solid when it cools. It can be heated again and it will melt. And if we let it cool again, it will become solid.Options (2) and (3) are reversible changes. Hence, the right answer is Option D.

Ans 2:

Sameer Anand from ST MICHAEL'S HIGH SCHOOL, PATNA
Class : Class 8
d is correct

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Bhavya Jain from K.R Manglam World School, Ghaziabad
Subject :NSO    Class : Class 5

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Atharv salokhe from Tatyasaheb kore english academy, Warananagar
Subject :NSO    Class : Class 9

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Raksheet Shah from Swami Vivekanad International School, Mumbai
Subject :NSO    Class : Class 5

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AARNA Kapse from The swaminarayan school, Nagpur
Subject :NSO    Class : Class 3

Ans 1:

Priyanshi Pritam from Vibgyor High, Bangalore
Class : Class 4
correct ans is c

Ans 2:

Santina Suzanne from owis, bangalore
Class : Class 4
it it is very hard

Ans 3:

Sia Parekh from Pawar Public School, Mumbai
Class : Class 7

Ans 4:

Sia Parekh from Pawar Public School, Mumbai
Class : Class 7
Yes correct answer is C.

Ans 5:

Arihant Medhi from Dps Barasat, Kolkata
Class : Class 8
Sparrow has short and broad beak.Correct A

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Kartik Chauhan from Euro school , Pune
Subject :NSO    Class : Class 7

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GAURISHA from MVN, Faridabad
Subject :NSO    Class : Class 5

Ans 1:

Akanksha Mohapatro from DPS Bangalore North, Bangalore
Class : Class 5

Ans 2:

Shreyansh Gupta from MVN, faridabad
Class : Class 6
dfgfvnjkunfhgcfdcfdcdfvdfxvdfvdvdv full out of full horray

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Shayan Bari from Kendriya Vidyalaya, Katihar
Subject :NSO    Class : Class 3

Ans 1:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
Bot STD and Local is used within a country.

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Dhruvan G from Indian School al Ghubra, Muscat
Subject :NSO    Class : Class 9

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B


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Shourya Kumar from Delhi Public School Noida, Noida
Subject :NSO    Class : Class 6

Ans 1:

Nitya Dey from DPS, VINDHYANAGAR
Class : Class 9

Ans 2:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
charvi, statement one is true as aafter fixing on wood , matel needs to contract to get tighterhence , the size is slightly smalle than wood

Ans 3:

Veera Kothari from sanjivani academy , kopargaon
Class : Class 3
it can be kept both smaller and larger than wheel as metals expand on heating and contract on cooling

Ans 4:

Tanmay Chaudhary from MIET public school, MEERUT
Class : Class 7

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