National Science Olympiad Forum By SOF Olympiad Trainer - Page 355
  1. Home
  2. /  Forum

User Forum

Ask Your Question
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

Post Your Answer

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

Post Your Answer

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

Post Your Answer

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

Post Your Answer

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Post Your Answer

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

Post Your Answer

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

Post Your Answer

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.

Post Your Answer

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


Post Your Answer

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

Ans 1:

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 2:

Nitya Dey from DPS, VINDHYANAGAR
Class : Class 9

Ans 3:

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 4:

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

Post Your Answer