National Science Olympiad Forum By SOF Olympiad Trainer - Page 408
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Fabiola from birla public school, DOHA
Subject :NSO    Class : Class 6

Ans 1:

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

Ans 2:

Kalpesh from Tapovan , Mahesana
Class : Class 7

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

Ishitadas from Adamas World school , Ichapur
Class : Class 8

Ans 9:

Jahnvi Bajpai from Vibgyor High, Banagalore
Class : Class 6

Ans 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10

Ans 14:

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

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

Ans 1:

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

Ans 2:

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 3:

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

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:

Ayansh Mallick from ,
Class : Class 6
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 6:

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

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:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10

Ans 9:

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

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

Ans 1:

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 2:

Iraj Singh from DPS Megacity, Kolkata
Class : Class 8
The correct answer is B because it has webbed feet.

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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.

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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:

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

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:

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

Ans 5:

Ashher Pervez from DPS Bhilai, Bhilai
Class : Class 10

Ans 6:

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

Ans 7:

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.

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

Ans 1:

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 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

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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D HARSHINI from ST MARTINS HIGH SCHOOL CHINTAL, HYDERABAD
Subject :NSO    Class : Class 9

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