National Science Olympiad Forum By SOF Olympiad Trainer
  1. Home
  2. /  Forum

User Forum

Ask Your Question
chandra Deb from ,
Subject :NSO    Class : Class 5

Ans 1:

Pragun goel from Venkateshwar International School, Delhi
Class : Class 7
sea snakes also breathe through skin so option 1 should also be correct.

Ans 2:

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

Ans 3:

Bhavya Agrawal from Cambridge Court High School , JAIPUR
Class : Class 6
you are correct Pragun goel . my answer is also a.

Ans 4:

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

Post Your Answer

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.

Post Your Answer

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.

Post Your Answer

vaibhav from , Faridabad
Subject :NSO    Class : Class 7

Ans 1:

Grammar Frost from SBOA Global, Chennai
Class : Class 7
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 2:

from , Jamnagar
Class : Class 7

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 7

Ans 7:

Grammar Frost from SBOA Global, Chennai
Class : Class 7
Is D. ✔

Ans 8:

Arush from Anandi Public School, Udgir
Class : Class 3

Ans 9:

shweta garg from Apeejay School, Ghaziabad
Class : Class 7

Ans 10:

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

Ans 11:

Anand Agarwal from stems, kuchinda
Class : Class 7

Ans 12:

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

Post Your Answer

ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Refer to the given paragraph and table and answer the following questions.
Neha took 100 gm each of three types of soil, X, Y and Z, in three separate pots with hole at the bottom. The amount of water that was poured in the soil pot, just before it started dripping from the bottom hole, is tabulated here.

The soil that is mixture of clay, sand, humus and is usually very good for growth of most plants is __________.

A X
B Y
C Z
D Cannot be determined


Ans shd be D (Cannot be determined)

Ans 1:

ABHAY AGARWAL from ,
Class : Class 3

Ans 2:

ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur
Class : Class 5
B IS THE ANSWER ANURADHA NAIR 4C

Post Your Answer

ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Ans 1:

ABHAY AGARWAL from ,
Class : Class 3

Ans 2:

Anika from Alphabets, Chennai
Class : Class 5
Chloro-fluro-carbon

Ans 3:

Mohhika Sharma from Delhi Public School Greater Noida, Greater Noida
Class : Class 4
I think the answer should be CFC but it is not in the options only.But I also think that it is CO2.

Ans 4:

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

Ans 5:

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

Ans 6:

Nishchita from Gems Modern Academy , Dubai
Class : Class 5
The answer is B as when we use electricity fuel gets burnt and so it produces carbon dioxide.

Ans 7:

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

Ans 8:

Shaurya Veer from CAMBRIDGE INTERNATIONAL SCHOOL , Palampur
Class : Class 6
The correct answer should be CFC

Ans 9:

BV Karthikeya from Sentia, Hyderabad
Class : Class 6

Ans 10:

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 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

SAURISH from R.N. Podar, Mumbai
Class : Class 6
THE OPTION SHOULD HAVE BEEN CFC OR WE CAN TAKE THE OPTION D [NITROGEN] BUT IT IS SHOWING WRONG

Ans 15:

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

Ans 16:

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

Post Your Answer

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

Post Your Answer

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.

Post Your Answer

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 D.

Post Your Answer

Pradanya from KV IIT, Chennai
Subject :NSO    Class : Class 6

Ans 1:

SANJEEV VARSHNEY from Lotus valley international school, Noida
Class : Class 5
ans is D

Ans 2:

ansh rai from delhi public school, Bhilai
Class : Class 4

Ans 3:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 6
the answer is d

Ans 4:

Ritvik Bansal from K R Mangalam World School, Gurgaon
Class : Class 6
answer is clearly a

Ans 5:

from , dhule
Class : Class 7
master answwer really

Ans 6:

Dushyant Singh from Shree Ram Centenial School, Indore
Class : Class 6
a

Post Your Answer