National Science Olympiad Forum By SOF Olympiad Trainer - Page 672
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ANANYA.KUMAR from DPS Noida, Noida
Subject :NSO    Class : Class 5

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

rethish from Veltech, Avadi
Class : Class 3

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

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 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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

Ans 17:

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

Ans 18:

Arnav Raj Sharma from Dpsvk, Gurgaon
Class : Class 9
please explain

Ans 19:

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 20:

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 21:

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

Ans 22:

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

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

Ans 1:

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 2:

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

Ans 3:

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 4:

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

Ans 5:

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 6:

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

Ans 7:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4

Ans 8:

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 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

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 13:

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

Ans 14:

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

Ans 15:

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.

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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:

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 2:

Arnav kaul from Chirec, Hyderabad
Class : Class 2

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

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

Ans 1:

Shreyansh Gupta from MVN, faridabad
Class : Class 7
Novosti

Ans 2:

Pratham Dave from GNS, Bangalore
Class : Class 7
Novosti

Ans 3:

Tanmay kaushal from ICSE, Mumbai
Class : Class 5
Novosti

Ans 4:

Siddhant Singhania from The Assembly of God Church School, Purulia, Purulia
Class : Class 8

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

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

Ans 1:

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

Ans 2:

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

Ans 3: (Master Answer)

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

Ans 4:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8

Ans 5:

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

Ans 6:

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

Ans 7:

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

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Matisha Kansal from Sacred Heart High School, Chd, Chandigarh
Subject :NSO    Class : Class 6

Ans 1:

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

Ans 2:

Medha from Delhi Public School, Chd, Chandigarh
Class : Class 8
Answer is A (L) after the instruction the sequence is : N P S I L 4 W R 9 U F 7 S Y And then u get the answer

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punyah from kvs happy valley, shillong
Subject :NSO    Class : Class 4

Ans 1:

Gunnit Kant from DPS, Nerul, Navi Mumbai
Class : Class 5
d

Ans 2:

Aarvi Gosai from The New Tulip International School, Ahemdabad
Class : Class 4
A

Ans 3:

Devansh from asn senior secondary school, delhi
Class : Class 8
its [D]

Ans 4:

RAGHAV VARSHNEY from CITY MONTESSORI SCHOOL GOMTINAGAR LUCKNOW, Lucknow
Class : Class 7

Ans 5:

Daivik Goel from Delhi public school , Vadodara
Class : Class 4
The correct option is -(D)

Ans 6:

Shreyansh Saha from Dps Megacity, Kolkata
Class : Class 6
Option D

Ans 7:

Swarnava Pal from Vivekananda Mission School, Haldia
Class : Class 8

Ans 8:

shreyash rawat from podar international school, pune
Class : Class 8
its [D]

Ans 9:

Isra Fathima from sophia high school, Bengaluru
Class : Class 7

Post Your Answer

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

Ans 1:

Medha Bhutani from Christ Academy, Bengaluru
Class : Class 9
chlorine and UV rays are tertiary treatment

Ans 2:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM
Class : Class 10
SCUM,SLUDGE.

Ans 3:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM
Class : Class 10
CSEDIMENTATIONSCUM.SLUDGE

Ans 4:

DIVYA PRAKASH from ST.MICHAEL'S HIGH SCHOOL, PATNA
Class : Class 8
good

Ans 5:

UTKARSH SAWARN from AIR FORCE SCHAOOL AMBALA CANTT, AMBALA CANTT
Class : Class 8

Ans 6:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
Sludge settles down while scum stays up

Ans 7:

UTKARSH SAWARN from AIR FORCE SCHAOOL AMBALA CANTT, AMBALA CANTT
Class : Class 8
SLUDGE IS THE SOLID WASTE

Ans 8:

Anshuman D from MVM, Hyderabad
Class : Class 9
Sludge settles while scum floats .you are right

Ans 9:

Chaitanya L K from SKCHEC, bangalore
Class : Class 8
yeah...sludge settles and scum floats.

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