National Science Olympiad Forum By SOF Olympiad Trainer - Page 632
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Priyanshu Gupta from Ryan International School , Kandivali Mumbai
Subject :NSO    Class : Class 9

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Asmi Inamdar from KV IIT , Mumbai
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

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

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Swati from Ryan, Bengaluru
Subject :NSO    Class : Class 5

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ANANYA.KUMAR from DPS Noida, Noida
Subject :NSO    Class : Class 5

Ans 1:

Sanskriti Nagar from Rose Bud Academy, khagaria
Class : Class 5
C is the answerIf you open synopsis in this chapter,it is clearly written that a compass works with the help of earth's magnetic field

Ans 2:

arya navare from Saint ursula school, kankavli
Class : Class 5

Ans 3:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
Earth's magnetic field.

Ans 4:

Biju Pappachan from Rkc , Raipur
Class : Class 1
If u don’t understand after reading the solution tell Siri to explain u

Ans 5:

Shraddha S Nair from Bright CBSE, Day school vasna, Vadodara
Class : Class 7
ANSWER SHOULD BE C

Ans 6:

Pratham Dave from GNS, Bangalore
Class : Class 7
C is the answer to this question

Ans 7:

RAMAYANI PAKHARE from S M SHETTY HIGH SCHOOL, MUMBAI
Class : Class 6
Earth's magnetic field (C)

Ans 8:

Koustavi Chakraborty from DELHI PUBLIC SCHOOL, PUNE
Class : Class 5
answer is option c

Ans 9:

Pratiksha Panda from Sri Kumaran's School, Bangalore
Class : Class 5
sanskriti nagar is correct

Ans 10:

Deepika Goyal from Neerja modi school, Jaipur
Class : Class 7
C (EARTH'S MAGNETIC FIELD)

Ans 11:

Arav from Shishukunj International, Indore
Class : Class 7
The correct option is C as all compasses are controlled by Earth's magnetic field.

Ans 12:

Akshita Krishnan from DPS Noida, Noida
Class : Class 8
I still don't understand this question after reading the solution.😬😱

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Charu Gupta from DPS Faridabad, Faridabad
Subject :NSO    Class : Class 7

Ans 1:

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee
Class : Class 10
D IS INCOMPLETE OPTION.

Ans 2:

Anuraaj Salunkhe from St Gregorios High School, Mumbai
Class : Class 10

Ans 3:

SHREYAN GUPTA from GARDEN HIGH SCHOOL, KOLKATA
Class : Class 9
Where is D?

Ans 4:

arjun from the bishops school camp , pune
Class : Class 8
OPTION D SHOULD BE ''BOTH B AND C

Ans 5:

Hritvi from Podar International School, Mumbai
Class : Class 7
D is an incomplete option .

Ans 6:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10
Yes,it is wrong. Incomplete option

Ans 7:

Nida Farheen CM from vedavyasa, kozhikode
Class : Class 10
the answer is d

Ans 8:

rethish from Veltech, Avadi
Class : Class 3

Ans 9:

Venya Vikas from Chirec International , Hyderabad
Class : Class 7
D is an incomplete option

Ans 10:

Arnav Raj Sharma from GEMS International School the ultra master mega, Gurgaon
Class : Class 7
please explain

Ans 11:

Advait bhat from Kendriya Vidyalaya , Bangalore
Class : Class 9
d is an incomplete answer

Ans 12:

Jahnavi Srikoti from narayana, Ghaziabad
Class : Class 7
d is incomplete

Ans 13:

Pratham Dave from GNS, Bangalore
Class : Class 7
D is an incomplete option

Ans 14:

Shourya Bhushan from DPS Gurgaon, Gurgaon
Class : Class 7
They have not written: Both B and C in the D option. Whereas, B is important in the D option.

Ans 15:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4
d is incomplete

Ans 16:

Aanya from DAV, Gurgaon
Class : Class 8
The whole statement isn't mentioned

Ans 17:

Iba Khan from DPS , Noida
Class : Class 8
d is grammatically incorrect

Ans 18:

Mayank Mili from Delhi Public School, Golaghat
Class : Class 9
D is incomplete answer

Ans 19:

rethish from Veltech, Avadi
Class : Class 3
Turmeric indicator remains yellow in acidic (vinegar) and neutral solutions (common salt solution) and turns red in basic solution (soap solution and baking soda).

Ans 20:

PS Gour from Chirec international schoo The best 30 years and beyond, Hyderabad
Class : Class 7
the last option is not understandable

Ans 21:

yash kirpalani from st gregorios high school chembur, Mumbai
Class : Class 7
the last option is incomplete the complete option should be Both B and C

Ans 22:

rethish from Veltech, Avadi
Class : Class 3
so it is both b and c now ok guys.

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Hiyansh Jain from Podar International School, Mumbai
Subject :NSO    Class : Class 5

Ans 1:

Hiyansh Jain from Podar International School, Mumbai
Class : Class 7

Ans 2:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4

Ans 3:

Mannat Verma from Vivek High School , Chandigarh
Class : Class 6
Volcano is an opening on the surface of Earth’s crust. There are three types of volcanoes: (i) Active volcanoes are those which are currently erupting or have erupted in the last 10,000 years. (ii) The dormant volcanoes are in a state of sleep. This means that they had erupted in the past but can erupt again, however, at the moment they are asleep. (iii) Extinct volcanoes are those that have been inactive for thousands of years and are not expected to erupt again. The liquid that comes out of a volcano is called lava. Richter scale measures magnitude of earthquakes and was developed by Charles Richter in 1935.

Ans 4:

Hiyansh Jain from Podar International School, Mumbai
Class : Class 7
ok

Ans 5:

SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad
Class : Class 6
nope you are telling the opposite

Ans 6:

Anantjit Chander from Apeejay School, Sector 15, Faridabad
Class : Class 10
The answer is (C), but (B) can also be the answer.

Ans 7:

Anantjit Chander from Apeejay School, Sector 15, Faridabad
Class : Class 10
Sorry, I had was to mark this one only, but instead of (C), I clicked on (B)!

Ans 8:

Fiza from ABCD, Cochin
Class : Class 7
When it's inside a volcano, it's called magma. When it's out, it's called lava.

Ans 9:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
Totally agree with you Mannat

Ans 10:

Athiya Mahapatra from ITL Public School, NewDelhi
Class : Class 5
From Athiya Mahapatra: option)c As the Upper layer of Earth is called Crust. The liquid which flows outside a volcano is called lava and Richter Scale is used to measure intensity of earthquakes.

Ans 11:

RISHABH from BHARATIYTA VIDYA BHAVAN, KOLKATA
Class : Class 10
the answer is b

Ans 12:

Biju Pappachan from Rkc , Raipur
Class : Class 1
The correct Ans is B and I did B but SOF is telling me I did C. Impossible and I am telling the truth I swear.

Ans 13:

Anantjit Chander from Apeejay School, Sector 15, Faridabad
Class : Class 10
I feel the (B) should be the correct answer, so please explain why (C) is the correct one.

Ans 14:

SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad
Class : Class 6
nope you are telling the opposite

Ans 15:

RISHABH from BHARATIYTA VIDYA BHAVAN, KOLKATA
Class : Class 10
ans should be b

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Sanjeev Garg from Assumption Convent School, malout
Subject :NSO    Class : Class 5

Ans 1:

INDRANI GHOSH ROY from AMRITA VIDYALAYAM, Durgapur
Class : Class 5
First of all, fish, crocodile and snakes, all these three are egg laying animals. Secondly, all of them are cold blooded animals. And thirdly, all of them are covered with scales. And therefore, statements 1, 2 & 3 are correct. That is why option C is correct.

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YASH SAH from DELHI PUBLIC SCHOOL MIS DOHA, Doha
Subject :NSO    Class : Class 5

Ans 1:

YASH SAH from DELHI PUBLIC SCHOOL MIS DOHA, Doha
Class : Class 8
syu

Ans 2:

Trijash Maut from Delhi Public School Digboi, Digboi
Class : Class 6
YOYOYOYOOOO

Ans 3:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5
got a little confused here but sorted it out

Ans 4:

AREEN from BOLTON, HYDERABAD
Class : Class 6
Ans is C because 0 minutes was 20 degrees celsius. Then, we were adding 6 after 2, 4, 6 minutes and so on. 1 is half of 2, and 1+2=3. So we should take normally 26 degrees celsius+(Half of 6) degrees celsius=26 degrees celsius+3 degrees celsius=29 degrees celsius.

Ans 5:

Arnav kaul from Chirec, Hyderabad
Class : Class 2

Ans 6:

VAIBHAVH RAMESH from NARAYANA ETECHNO WHITEFIELD, BANGALORE
Class : Class 5

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Siri B Patil from Indian School, Sohar, Oman, Sohar
Subject :NSO    Class : Class 5

Ans 1:

D Murari from Indian School of Excellence, Bangalore
Class : Class 9
Novosti

Ans 2:

Tanmay kaushal from ICSE, Mumbai
Class : Class 5
Novosti

Ans 3:

Arnav Vashisth from GD GOENKA PUBLIC SCHOOL, Delhi
Class : Class 5
Fishing rod changes speed of the fish

Ans 4:

Shaurya Shinde from Goldcrest High Vashi, Navi Mumbai
Class : Class 8
urenrjrjkvnm

Ans 5:

Pratham Dave from GNS, Bangalore
Class : Class 7
Novosti

Ans 6:

SANVI ROHILLA from The little shri, Rohtak
Class : Class 5
Novosti

Ans 7:

Shreyansh Gupta from MVN, faridabad
Class : Class 6
Novosti

Ans 8:

Siddhant Singhania from AGCS purulia, Puruliya
Class : Class 7

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Shriram dindore from KVS 9BRD AFS PUNE, PUNE
Subject :NSO    Class : Class 8

Ans 1:

Satvik Mehta from St Andrews school Bowenpally, Secunderabad
Class : Class 4
It should be a

Ans 2: (Master Answer)

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

Ans 3:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8

Ans 4:

RISHABH from BHARATIYTA VIDYA BHAVAN, KOLKATA
Class : Class 10
shouldnt it be a

Ans 5:

Can I get Rank 35 darryl from Global Indian international school, Brawl stars
Class : Class 8

Ans 6:

Palchin from Naval public school, Uran
Class : Class 8
please explain

Ans 7:

Rakshit Mittal from Atomic energy central school 4, Mumbai
Class : Class 10

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