National Science Olympiad Forum By SOF Olympiad Trainer - Page 647
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Prasuk Jain from Modern Delhi Public School, Faridabad
Subject :NSO    Class : Class 7

Saurabh burned two different fibres X and Y in order to identify them. X smelt like burning paper while Y smelt like burning hair. Which of the following options correctly identifies the two fibres?


Ans 1:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Class : Class 10

Ans 2:

Aksh singh from The asian school, Dehradun
Class : Class 7

Ans 3: (Master Answer)

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

Ans 4:

Aparajita Biswas from Don Bosco School Silchar, SILCHAR
Class : Class 7
THE CORRECT ANS IS OPTION C

Post Your Answer

Pulkit Gupta from Maxfort School, New Delhi
Subject :NSO    Class : Class 6

Ans 1:

pranavramesh from sri chaitanya techno school, Chennai
Class : Class 6
sof the answer is ddd so many times i am really fed up of your wrong answers and that is really very shamful on you.

Ans 2:

Ayush Chauhan from Modern Public School, Bhiwadi
Class : Class 9
Answer is D

Ans 3:

Thejaswini from Rajagiri, Chennai
Class : Class 7

Ans 4:

Karthik from Euro, Bengaluru
Class : Class 7
ans is d

Ans 5:

Mihika Hivarekar from Global Indian International School, Pune
Class : Class 7

Ans 6:

Advik from DPS Patna, Patna
Class : Class 4
its got to be ddddd!!

Ans 7:

Pratheek from Null, Null
Class : Class 4
Option D. All of the above.

Ans 8:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
i agree with d

Ans 9: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Ans 10:

kpks14 from RIMT World School, Chandigarh
Class : Class 7
d is the answer but the trainer is showing b as answer air reflects light that is why the sky is blue

Ans 11:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai
Class : Class 6
i mean except Satwik

Ans 12:

Aditya Sai Kedarisetty from Sri Kumarans childrens Academy DKS, Bangalore
Class : Class 7
@ashwak control your language

Ans 13:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai
Class : Class 6
I agree with everyone is Satwik because air trasparent it neither reflects nor absorbs light and trasmits whole of light So ans is D

Ans 14:

Arsh from Lahs, Gwalior
Class : Class 3
ans is d sof !!!!!!!!!!!!! ans is d

Ans 15:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Explain this dumb question and an even dumber answer " Master Answer"

Ans 16:

Ashwak from Cambridge, Jalandhar
Class : Class 9
What in the freaking world . I am surprised that these dumb idiots can even host international and national olympiads . Even a 5 year old could get the answer right . I won't be surprised if they give the answer 22 of the question 2 2 . I am telling you we are wasting money on these damn question papers

Ans 17:

Mihika Hivarekar from Global Indian International School, Pune
Class : Class 7
CHILL PPL CHILL

Ans 18:

Hari Govind from Delhi Public School Chandigarh , Chandigarh
Class : Class 6
THE ANSWER IS D

Ans 19:

Ishayu Mukherjee from Don Bosco Park Circus, Kolkata
Class : Class 6
The answer is wrong. The correct answer is D

Ans 20:

Parth Kaushish from MDPS, Faridabad
Class : Class 6
its D come on two total mistakes in one test

Ans 21:

niuv from meridian, Hyderabad
Class : Class 6
ANS IS D

Ans 22:

Tanishtha from DPS, Greater Noida
Class : Class 7
ans is d

Ans 23:

Aarush Laddha from NCFE, bengaluru
Class : Class 6
Answer is D as air it neither absorbs or reflects light,its almost transparent,it transmits the whole of light.

Ans 24:

Naisha from Brilliant public school b, Bilaspur
Class : Class 8
D

Ans 25:

Tanishtha from DPS, Greater Noida
Class : Class 7
ans is d

Ans 26:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Answer is D

Ans 27:

Videh Jain from Bluebells School International, Delhi
Class : Class 6
d is the ans

Ans 28:

arnav santosh shinde from new english school , landewadi
Class : Class 4
ANS IS D

Ans 29:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
these days sof olympiad trainer has gone mad. in one test, i got 4 perfectly wrong question . and now this . this adds up to fivei do not know what is the problemans should be ddddddddd!!!!!

Ans 30:

satwik patnaik from DPS Rourkela, Rourkela
Class : Class 7
And is b

Ans 31:

Pratheek from Null, Null
Class : Class 4
Option D. All of the above.

Ans 32:

Aarav Garg from DPS Greater Noida, Greater Noida
Class : Class 7
It should be d but they are telling its b.

Ans 33:

khushi Joshi from Svkm , Mumbai
Class : Class 10
Ans is D as air is all of the above

Ans 34:

Aditya Sai Kedarisetty from Sri Kumarans childrens Academy DKS, Bangalore
Class : Class 7
The answer is 'D' option, 'All of the above'. It is so because Air is not visible because it neither absorbs nor reflects light, it transmits whole of light. Dust particles in air is visible as they reflect light. Air is almost transparent substance. It is not dust to be visibile. It is air, it is completely transparent.

Ans 35:

Bhabani Prasad from Narayan School, Kolkata
Class : Class 6
D is the ans as air is matter and is very transparent.

Ans 36:

Siddharth from DPS, Jodhpur
Class : Class 9
The correct answer should be option D, All of these

Ans 37:

Shruti Rajshree from NPS Indiranagar, Bengaluru
Class : Class 3
answer is B as given in the answers. there is a solution too

Ans 38:

AJAY LAHOTI from SPRINGDALES DUBAI, Dubai
Class : Class 6
I should be d

Ans 39:

ARAMINTA SAHA from VIBGYOR HIGH BALEWADI, PUNE
Class : Class 6
ans is d because it is transparent which allows light to pass, it doesn't observe light but transmits all light

Ans 40:

Mitra Maiti from Techno India Group Public School, Bolpur Prantik
Class : Class 6
It is true that air is a perfectly transparent object. It neither absorbs nor reflects light. It transmits whole of light. So, all the options are correct and answer is D.

Ans 41:

Sharmi Chowdhury from G.D Birla Centre For Education , Kolkata
Class : Class 7
Answer is d

Ans 42:

Anika Saha from New Town School, KOLKATA
Class : Class 6
ANS IS D

Ans 43:

Aarnav Grover from Anand Niketan Shilaj, Ahmedabad
Class : Class 9
I think its D not B

Ans 44:

Devdarsh hero from HOLY GRACE, Mala
Class : Class 6
ans is D

Ans 45:

HARSHAL KUTE from cambridge school buldhana, Buldhana
Class : Class 6
ans is d

Ans 46:

Agrim Jai from Modern Bharakhamba, Delhi
Class : Class 7
D

Ans 47:

malhar thorve from city internqtional school, satara road, pune
Class : Class 7

Post Your Answer

Swati from Ryan, Bengaluru
Subject :NSO    Class : Class 8

Ans 1:

N Sankar Narahari from Madhavakripa English Nursery and Higher Primary School, Manipal
Class : Class 7
answer is b

Ans 2:

sk from psbb millennium school, Chennai
Class : Class 9

Ans 3:

Sumedha Mishra from xyz, School, Pune
Class : Class 8

Ans 4:

Vihaan Nair from Ambassador School, DUBAI
Class : Class 8

Ans 5:

N Sankar Narahari from Madhavakripa English Nursery and Higher Primary School, Manipal
Class : Class 7
everybody just copy and paste it, can anyone explain in an easier way

Ans 6:

chepz from abc school, pandikkad
Class : Class 10
The common error is to think that pressure at 0.4h above the surface of the reservoir of mercury is 0.4 times the atmospheric pressure. The pressure at p is caused by the weight of mercury above point P. Thus preesure at P is equal to : 0.6x 100000 = 60000 Pa

Ans 7:

Harsh Kant from Gyan Ganga Educational Academy, Raipur
Class : Class 9

Ans 8:

Gokul Warrier M from SRI KUMARANS MALLASANDRA, BANGALORE
Class : Class 9

Ans 9: (Master Answer)

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

Post Your Answer

Mihir Arora from dpsg, ghaziabad
Subject :NSO    Class : Class 3

Ans 1:

Malav patel from Navrachana school sama , Vadodara
Class : Class 5
A is the correct answer as 1 and 2 are correct

Ans 2: (Master Answer)

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

Post Your Answer

Harshita.B from Narayana e techno school, Poonamalle
Subject :NSO    Class : Class 3

Ans 1:

SHAUNAK from St Xaviers School, HAZARIBAG
Class : Class 3
The correct answer is D [friction].

Ans 2:

Arnav Yadav from Delhi Public School Rohini ,New Delhi, New Delhi
Class : Class 6
obviusly it will be d

Ans 3:

Thaneesha from Radcliffe School, Kharghar
Class : Class 7
Y...I DONT UNDERSTAND SOOOOO....................TELL MEH!!

Ans 4: (Master Answer)

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

Ans 5:

Karangat house from Navy Children School, Payyannur
Class : Class 3

Ans 6:

Ashwak from Cambridge, Jalandhar
Class : Class 9
I too

Post Your Answer

Kimaya and Sanaya from Ekya School, Bengaluru
Subject :NSO    Class : Class 3

Post Your Answer

RAYAN NAJEEB from Delhi public school, RIYADH
Subject :NSO    Class : Class 1

Ans 1:

shruti badgujar from Modern English School , Aurangabad
Class : Class 2
a

Ans 2:

Parth Kaushish from MDPS, Faridabad
Class : Class 6

Ans 3: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
No, the answer is D because in the option A the second image is of a full moon and not a new moon.

Ans 4:

Saiansh Biswas from Little Flower School, Jamshedpur
Class : Class 4
I think the correct answer is a, not d.

Ans 5:

Akshat Singh Kushwaha from Billabong high international school , Bhopal
Class : Class 1

Post Your Answer

Adithi Keshava from National Center For Excellence , Bangalore
Subject :NSO    Class : Class 4

Ans 1:

Ishaan Singh from BBPS, Gurugram
Class : Class 9
The answer is B.

Ans 2:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi
Class : Class 7
B

Ans 3:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 9
kojjk

Ans 4:

vivaan sethi from GD goenka public school, Delhi
Class : Class 4
all of you shut up especially ajinkya

Ans 5:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 9
why the question have given like this I don't know. why olimpiadtrainer sometimes do like this.Can anyone tell me the answer.I request to you all.Please help me or else I have tell to my father.I don't want to tell my father.I beg to you please.

Ans 6:

adhiraj chaudhary from apeejay school noida, noida
Class : Class 3
you all are mad

Ans 7:

Ajinkya Kamble from Thakur public school, Mumbai
Class : Class 7
the question you had given ,in the solution of the question of it is another one,the solution of the real question was its solution so we could not find the solution of this question.

Ans 8:

adhiraj chaudhary from apeejay school noida, noida
Class : Class 3
i will tell to your dad das ji

Ans 9:

Ishaani Jha from VIBGYOR High Hennur, Bengaluru
Class : Class 5
why is everyone arguing?

Ans 10:

adhiraj chaudhary from apeejay school noida, noida
Class : Class 3
blah blah blah every one

Post Your Answer

Aryan Goyal from DPS , Dwarka, New Delhi
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
No, the correct answer is D. When written in decimal, the value of it comes out to be 0.2 and the rest are bigger than it. In fractions, as the denominator gets bigger, the number gets smaller.

Post Your Answer

JOSH K SINGH from SACRED HEART, LUDHIANA
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

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

Post Your Answer

X Y
(A) Wool Silk
(B) Cotton Rayon
(C) Cotton Silk
(D) Silk Wool