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

User Forum

Ask Your Question
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:

Anand Agarwal from stems, kuchinda
Class : Class 7

Ans 2:

from , Jamnagar
Class : Class 7

Ans 3:

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 4:

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

Ans 5:

Aryan Keswani from Green Fields School, New Delhi
Class : Class 7

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

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

Ans 10:

Arush from Anandi Public School, Udgir
Class : Class 3

Ans 11:

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

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:

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

Ans 2:

ABHAY AGARWAL from ,
Class : Class 3

Post Your Answer

ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Ans 1:

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 2:

SAURISH from Podar, Mumbai
Class : Class 4
THE OPTION SHOULD HAVE BEEN CFC OR WE CAN TAKE THE OPTION D [NITROGEN] BUT IT IS SHOWING WRONG

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:

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

Ans 5:

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

Ans 6:

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

Ans 7:

ABHAY AGARWAL from ,
Class : Class 3

Ans 8:

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 9:

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

Ans 10:

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

Ans 11:

BV Karthikeya from Sentia, Hyderabad
Class : Class 5
I GOT IT CORRECT

Ans 12:

BV Karthikeya from Sentia, Hyderabad
Class : Class 5

Ans 13:

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

Ans 14:

Rehaan Sejwal from Gyan Bharati school, Delhi
Class : Class 5

Ans 15:

Anika from Alphabets, Chennai
Class : Class 4
Chloro-fluro-carbon

Ans 16:

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

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:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

from , dhule
Class : Class 7
master answwer really

Post Your Answer

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

Ans 1:

Mitra Maiti from Techno India Group Public School, Bolpur Prantik
Class : Class 6
The correct answer is B as the bulb Y is in straight series and there is no change of current passing through it. And the curent gets equally divided among X and Y.

Ans 2:

Parthvi Mishra from DPS Nacharam, Hyderabad
Class : Class 6

Ans 3:

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

Ans 4:

Abhaid Goel from Indian School , Muladha
Class : Class 9
correct answer should be option B because there is no change in the current passing through lamp Y.

Ans 5:

Mitra Maiti from Techno India Group Public School, Bolpur Prantik
Class : Class 6

Ans 6:

Omkar Deshmukh from phoenix greens international school, Hyderabad
Class : Class 7
It should be B as no change of current is there in Y.

Ans 7:

Irresh Vijay from NPSI Singapore, Singapore
Class : Class 6

Ans 8:

Raghav from Shalom Hills International school, Gurgaon
Class : Class 6

Ans 9:

Agustya vaid from Somerville school vasundhara enclave, Delhi
Class : Class 7
i agree with him too

Ans 10:

from Sri Chaitanya Techno School, Bengaluru
Class : Class 9

Ans 11:

khushi Joshi from Svkm , Mumbai
Class : Class 8
I agree with Abhaid Goel.

Post Your Answer

Pranesh kannan from Dr g s k, Kumbakonam
Subject :NSO    Class : Class 7

Ans 1:

Sriyansh from Surabhi , Hosapete
Class : Class 9
The scientific name of WBC is leukocyte. There are 5 types of leukocytes namely: Basophils , Eosinophil, Neutrophil, Lymphocyte. The scientific name of red blood cells is erythrocytes. Maybe there is no scientific name for platelets or it may appear that I don't know it.

Post Your Answer