National Science Olympiad Forum By SOF Olympiad Trainer - Page 408
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Swarit from Indian School Wadi kabir, Muscat
Subject :NSO    Class : Class 5

Ans 1:

Arnav Nandan from ST PETERS COLLEGE AGRA, Agra
Class : Class 9
idk these type of questions because i am not able to understand what animal they are talking

Ans 2:

Nishit Vaity from Euro School Airoli, Navi Mumbai
Class : Class 6
idk

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Aaron Dominic from Ryan International School, Bangalore
Subject :NSO    Class : Class 7

Ans 1:

Midhuna from ABCD, Banglore
Class : Class 3
IDK

Ans 2:

Arshia Kochhar from Delhi Public School Dwarka , New Delhi, Dwarka
Class : Class 8
so confusingggg

Ans 3:

Kashvi Rawat from Gear Innovative International School, Bengaluru
Class : Class 3
Wouldn't 'A' be a short circuit?

Ans 4:

Adwitiya Roy from South Point High School, KOLKATA
Class : Class 8

Ans 5:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
I don't think A will be a short circuit, as the current is flowing through an electric appliance (the bulb in this case), while a short circuit is when positive and negative terminals are connected directly. But I think that A is the correct answer as in all the other circuits, the circuit is open.

Ans 6:

Riddhik Bose from Vibgyor High, Airoli, Mumbai
Class : Class 4

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Swarit from Indian School Wadi kabir, Muscat
Subject :NSO    Class : Class 5

Ans 1:

Aaditya Malhotra from Isaac Newton Global School, Mumbai
Class : Class 3

Ans 2:

Debarpan Das from Delhi Public School , Durgapur
Class : Class 9

Ans 3:

Subhanshi Jha from DPS Vsant Kunj, New Delhi
Class : Class 7

Ans 4:

Swarit from Indian School Wadi kabir, Muscat
Class : Class 6
BAD QUESTION!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I AM ANGRY WITH U

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ALICE from Delhi Public School, UDAIPUR
Subject :NSO    Class : Class 3

Ans 1:

eekagrah bansal from Springdales dubai, dubai
Class : Class 6
clay boat can float on water so answer should be C (steel).

Ans 2:

Kashika Goel from DPS Noida, Noida
Class : Class 7
clay will always sink in water whether it is any clay pot or clay boat etc

Ans 3:

Ananya D from Sacred Heart School, Thane
Class : Class 8

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Fabiola from birla public school, DOHA
Subject :NSO    Class : Class 6

Ans 1:

Kalpesh from Tapovan , Mahesana
Class : Class 7

Ans 2:

aditri singh from jayshree periwal high school, jaipur
Class : Class 6

Ans 3:

ADVAY BANSAL from LOTUS VALLEY INTERNATIONAL SCHOOL GURUGRAM, GURUGRAM
Class : Class 6

Ans 4:

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

Ans 5:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8

Ans 6:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10

Ans 7:

Anish from St Peters Public School, Hyderabad
Class : Class 8
can you explain me

Ans 8:

Anamkhan Mulla from Navrachna Sama, Vadodara
Class : Class 7
Easyyyyyyyyyyyyyyyy

Ans 9:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8

Ans 10:

Vedang Amonkar from Dr K B Hedgewar High School, Panaji
Class : Class 6

Ans 11:

Jahnvi Bajpai from Vibgyor High, Banagalore
Class : Class 6

Ans 12:

Ojasvi Pradip Nimje from Bhavan's Bhagwandas Purohit Vidya Mandir, Nagpur
Class : Class 6
Please explain the answer

Ans 13:

Mitanshu Rajpurohit from B R Birla Public School, Jodhpur
Class : Class 6

Ans 14:

Ishitadas from Adamas World school , Ichapur
Class : Class 8

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Pratul Kumar Sahoo from Presidium, Gurugram
Subject :NSO    Class : Class 6

Ans 1:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai
Class : Class 6
if we remove metal wont it turn blue again ?

Ans 2:

Ashwak from Cambridge, Jalandhar
Class : Class 9
The answer is D Chemical and Irreversible

Ans 3:

Ayansh Mallick from Birla Open Minds, Hyderabad
Class : Class 7
guys logically if we take a protein sample and then after mixing it if we extract it the color gets reversed something with metal

Ans 4:

Reynah Gupta from The Shri Ram School, Aravali, Gurugram
Class : Class 10

Ans 5:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
answers abcd

Ans 6:

Devabhrith from Delhi Public School Electronic City Bangalore, Bengaluru
Class : Class 8
If we remove the metallic piece the solution's color won't change.So,Therefore it is an irreversable change and as it has been caused by Chemical Reaction of Metal and Copper Sulphate.So,Answer is D

Ans 7:

Arnesh from dps, delhi
Class : Class 6
The answer is D as even if we move the metal the colour of the solution won't change.

Ans 8:

SKIyer from CNS, Mumbai
Class : Class 6
No, missed it by some the properties of the metal mix with the solution. So according to me it is D which is the right answer

Ans 9:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10

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Divyansh Pradhan from Modern Vidya Niketan, Faridabad
Subject :NSO    Class : Class 3

Ans 1:

Abhijeet Gopinath from Greenwood High, Bengaluru
Class : Class 3
ama

Ans 2:

Vighnesh from DYPIS, Navi Mumbai
Class : Class 3
An ostrich cannot fly. They asked a bird which can fly but to very short distances. I selected A. It was wrong. I had looked at the forum and saw various logics where B is the correct answer.

Ans 3:

Iraj Singh from DPS Megacity, Kolkata
Class : Class 9
The correct answer is B because it has webbed feet.

Ans 4:

Achyut Rai from THE KHAITAN SCHOOL, NOIDA
Class : Class 7
B

Ans 5:

SPRIHA SINGH from KV BEML Nagar, KGF
Class : Class 4
The correct answer is B.

Ans 6:

Ava from trio, bangalore
Class : Class 2
It is a foot of a duck and ducks have webbed feet so it is option B

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Gulshan from SNS INTER COLLEGE SARAI HARKHU JAUNPUR UP, JAUNPUR
Subject :NSO    Class : Class 10

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Ashher Pervez from DPS Bhilai, Bhilai
Subject :NSO    Class : Class 7

Ans 1:

NIRANJAN A from NATIONAL PUBLIC SCHOOL, NAMAKKAL
Class : Class 10
case (iii)

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Ashher Pervez from DPS Bhilai, Bhilai
Subject :NSO    Class : Class 7

Ans 1:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
reason :the initial air was driven out of the bottle as the steam occupied the space inside. When it was emptied and capped tightly , some steam still remained inside the bottle. when cold water was poured over it , the steam condensed and turned into water droplets , which cause the reduction in air pressure inside the bottle. That is why , as the air pressure inside was lesser than the outside one , the bottle got crumpled (shrinked) to compensate the lose of air pressure. That is why both the options are correct.

Ans 2:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 9
But I thought that it was hot steam, so high temperature means low pressure and when it comes in contact with cold water(high pressure), it sinks. I didn't think about steam getting condensed and causing reduction in pressure. Well, we should check both the points. Anyways, according to me, both conclusions are correct. That is hot and cold (difference in pressure by temp) and reduction of air pressure, both are correct. So it can be either option A or D

Ans 3:

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee
Class : Class 10

Ans 4:

Ashher Pervez from DPS Bhilai, Bhilai
Class : Class 10

Ans 5:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM
Class : Class 10
A IS CORRECT ANSWER

Ans 6:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
yes D is the correct answer

Ans 7:

Netra Goyal from Presidency School, Bangalore
Class : Class 6
no air could come out of the bottle, so D is the correct answer.

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