National Science Olympiad Forum By SOF Olympiad Trainer - Page 651
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Sahasra Shanker from KV IIT, Chennai
Subject :NSO    Class : Class 6

Ans 1:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Class : Class 10

Ans 2:

Agustya vaid from Somerville school vasundhara enclave, Delhi
Class : Class 7

Ans 3:

Dushyant Singh from Shree Ram Centenial School, Indore
Class : Class 9
sof has given c which is wrong

Ans 4:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Class : Class 10

Ans 5:

kpks14 from RIMT World School, Chandigarh
Class : Class 7

Ans 6:

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

Ans 7:

Agustya vaid from Somerville school vasundhara enclave, Delhi
Class : Class 7
the answer is d because the field lines of a magnet always travle from north to south

Ans 8:

NEHA JOON from dps rohini , New delhi
Class : Class 8

Ans 9:

Rahil from Delhi Public School Faridabad, Faridabad
Class : Class 7

Ans 10:

Punya Paras Sundrani from Anand Niketan , Ahmedabad
Class : Class 8

Ans 11:

Veda Dua from Delhi Public School, R. K. Puram, New Delhi
Class : Class 10

Ans 12:

Winka Jayaprakash from Sri Vijay Vidyasharam , Hosur
Class : Class 9
the field line travels from north to south

Ans 13:

Agustya vaid from Somerville school vasundhara enclave, Delhi
Class : Class 7
understood?

Ans 14:

Ananya from GIIS, Bangalore
Class : Class 6
why cant the answer be A?

Ans 15:

Aadhira from velammal new gen school, Medavakkam, Chennai
Class : Class 6
The correct answer is (D) because the the magnetic field travels from north to south.

Ans 16:

Amrit Jolly from The Shri Ram School Aravali, Gurgaon
Class : Class 6

Ans 17:

Raghav Aggarwal from CAMBRIDGE SCHOOL INDIRAPURAM, INDIRAPURAM
Class : Class 7

Ans 18:

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

Ans 19:

arin chaitanya from the shri ram school, New Delhi
Class : Class 8

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Akshay Kumar from BVM, Chennai
Subject :NSO    Class : Class 7

Ans 1:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7

Ans 2:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 9
Yes, the answer is option "C". It is not true that arteries will always carry oxygenated blood and the veins will always carry deoxygenated blood (pulmonary vein and artery).

Ans 3:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7

Ans 4:

Mayank Gupta from Kulachi Hansraj Model School, New Delhi
Class : Class 8

Ans 5:

N Sankar Narahari from Madhavakripa English Nursery and Higher Primary School, Manipal
Class : Class 7
here option c holds true because in option a and b we can make an exception with pulmonary artery and vein.

Ans 6:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
C

Ans 7:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 9

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chandra Deb from ,
Subject :NSO    Class : Class 5

Ans 1:

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi
Class : Class 7

Ans 2:

Manasvi Nagpal from blooming dales international school, sri ganganagar
Class : Class 5
a and c both are correct answers

Ans 3:

Pragun goel from Venkateshwar International School, Delhi
Class : Class 8
sea snakes also breathe through skin so option 1 should also be correct.

Ans 4:

Bhavya Agrawal from Cambridge Court High School , JAIPUR
Class : Class 8
you are correct Pragun goel . my answer is also a.

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Shuvangi Das from Vivekananda mission school, haldia
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

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

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Rio Choudhury from South Point High School, Kolkata
Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
Molars and Premolars are mainly used to chew the food.

Ans 2:

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

Ans 3:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8
D can also be the ans

Ans 4:

Rithvik from BVM Global, Chennai
Class : Class 9
ummm........... its very tough to identify them....

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vaibhav from , Faridabad
Subject :NSO    Class : Class 7

Ans 1:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 2:

Soumyajit Roy from Delhi Public School Jamnagar, Jamnagar
Class : Class 9

Ans 3:

Areyouseriousrn from SBOA Global, Chennai
Class : Class 9
Is D. ✔

Ans 4:

Anand Agarwal from stems, kuchinda
Class : Class 7

Ans 5:

shweta garg from Apeejay School, Ghaziabad
Class : Class 7

Ans 6:

Aksh Swarnkar from National Center for Excellence CVR, Bangalore
Class : Class 8

Ans 7:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 8:

Areyouseriousrn from SBOA Global, Chennai
Class : Class 9
The solution: Enzyme X works best and increases the rate of reaction at an acidic pH (less than 7) of about two2️⃣ ! Enzyme Y is very very very very very very very very very very very very very very very very very efficient @ slightly acidic pH i.e., slightly less than seven!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Enzyme Z is most efficient at an alkaline pH (more than 7!!!). And alkali means a base which is soluble in water. In humans, gastric juice of stomach (a J-shaped bag with thick inner walls. Meh.) has pH in the range of 1.5-2.5, where enzymes such as pepsin, rennin etc. carry out the digestion of food. Thus, enzyme X can be found in stomach. Similarly, the saliva in the mouth of humans has sliiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiightly acidic pH of 6.8, where salivary amylase enzyme is moooooooooooooooooooooooooooooooooooooooost effective! Thus, enzyme Y can be found in the buccal cavity. Small intestine has slightly alkaline pH of 7.8, where enzymes such as trypsin help in digestion of food. So, enzyme Z can be found in duodenum. Morus Alba is the scientific name of mulberry.

Ans 9:

Arush from Anandi Public School, Udgir
Class : Class 3
such questions r always confusing.................

Ans 10:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10

Ans 11:

Arush from Anandi Public School, Udgir
Class : Class 3

Ans 12:

Tanushree from Asian International School, Colombo
Class : Class 7
Can someone pls send the explanation of why it's D🙏

Ans 13:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 14:

Maanasa from Billabong high, Chennai
Class : Class 7

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ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Ans 1:

ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur
Class : Class 9
B IS THE ANSWER ANURADHA NAIR 4C

Ans 2:

ABHAY AGARWAL from ,
Class : Class 3

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ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Ans 1:

Visakha Dhar from GD Goenka, jhajjar
Class : Class 3
the correct answer is CFCs .but is not mention in the option.

Ans 2:

Adit Aggarwal from Vibgyor High, Bengaluru
Class : Class 5
The answer was supposed to be CFC .

Ans 3:

Shaurya Veer from Army Public School ASC C and C , Bangalore
Class : Class 10
The correct answer should be CFC

Ans 4:

ABHAY AGARWAL from ,
Class : Class 3

Ans 5:

BV Karthikeya from Sentia, Hyderabad
Class : Class 6
I GOT IT CORRECT

Ans 6:

Deepika from Vibgyor high, Mumbai
Class : Class 1
It should be CFCS

Ans 7:

Aaditya Saxena from Ryan International School Pune, Pune
Class : Class 6
The Ans shud be B Carbon Dioxide. BBBBBBBBBBB

Ans 8:

Mehvish Khursheed from DPSGV, ghaziabad
Class : Class 5
correct answer is CFC

Ans 9:

Rehaan Sejwal from Gyan Bharati school, Delhi
Class : Class 7

Ans 10:

Tanirika Bansal from DPS Faridabad, Faridabad
Class : Class 4
CFCS should be correct answer but I got it right

Ans 11:

BV Karthikeya from Sentia, Hyderabad
Class : Class 6

Ans 12:

Nishchita from Gems Modern Academy , Dubai
Class : Class 8
The answer is B as when we use electricity fuel gets burnt and so it produces carbon dioxide.

Ans 13:

SRISANTH from Edify, Tirupathi
Class : Class 5
Actually it is b ,as a is CNG(compressed natural gas which is a energy source that is not a greenhouse gas

Ans 14:

SAURISH from R.N. Podar, Mumbai
Class : Class 10
THE OPTION SHOULD HAVE BEEN CFC OR WE CAN TAKE THE OPTION D [NITROGEN] BUT IT IS SHOWING WRONG

Ans 15:

somesh from Centre point katol road, Nagpur
Class : Class 6
It is CNG

Ans 16:

Abhinav Kulkarni from National Centre For Excellence, Bengaluru
Class : Class 4
the ans should be CFC

Ans 17:

Mohhika Sharma from Delhi Public School Greater Noida, Greater Noida
Class : Class 7
I think the answer should be CFC but it is not in the options only.But I also think that it is CO2.

Ans 18:

Anika S Kumar from Alphabets International school , Chennai
Class : Class 7
Chloro-fluro-carbon

Ans 19:

Mohammad Shahid from Dayawati Modi International Maple Bear, Modipuram, Meerut 250110, Meerut
Class : Class 4
how the released gas from refrigerator is CO2

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Jairaj Singh Basur from Vivek High School, Chandigarh
Subject :NSO    Class : Class 6

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shashwat pal from mnr school of excellence, navi mumbai
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

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

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