National Science Olympiad Forum By SOF Olympiad Trainer - Page 408
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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:

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

Ans 2:

Jahnvi Bajpai from Vibgyor High, Banagalore
Class : Class 6

Ans 3:

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

Ans 4:

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

Ans 5:

Kalpesh from Tapovan , Mahesana
Class : Class 7

Ans 6:

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

Ans 7:

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

Ans 8:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10

Ans 9:

Ishitadas from Adamas World school , Ichapur
Class : Class 8

Ans 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

malhar thorve from city internqtional school, satara road, pune
Class : Class 6

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

Ans 1:

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 2:

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 3:

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

Ans 4:

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 5:

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

Ans 6:

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

Ans 7:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10

Ans 8:

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

Ans 9:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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 5:

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

Ans 6:

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

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 2:

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

Ans 3:

Ashher Pervez from DPS Bhilai, Bhilai
Class : Class 10

Ans 4:

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 5:

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

Ans 6:

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

Ans 7:

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

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Debarpan Das from Delhi Public School , Durgapur
Subject :NSO    Class : Class 5

Ans 1:

Mahadevan from KV Rubber Board Kottayam, Kottayam
Class : Class 9
Please give explanation

Ans 2:

GYANDEEP from St Edmunds School, Shillong
Class : Class 5
h

Ans 3:

Sahasra Shanker from KV IIT, Chennai
Class : Class 6
The letters are written in the alphabetical order in the reverse way. ANGLE, the letter ‘A’ will be last and ‘N’ will be first. Answer- D. NLGEA

Ans 4:

Saarth Agrawal from Podar International School , Mumbai
Class : Class 6
HELP!!

Ans 5:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
Please explain.

Ans 6:

Sahasra Shanker from KV IIT, Chennai
Class : Class 6
The correct answer is (D), which is NLGEA.

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Debarpan Das from Delhi Public School , Durgapur
Subject :NSO    Class : Class 5

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Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Subject :NSO    Class : Class 5

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