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

User Forum

Ask Your Question
Sameer from MDVM PARLE, ALWAR
Subject :NSO    Class : Class 8

Ans 1:

Aditya Raj from Mount Litera Zee School, Baijalpur, Hajipur
Class : Class 8
By the help of Photon.

Post Your Answer

Pranathi Dindikurthi from Carmel School, Bangalore
Subject :NSO    Class : Class 6

Aarushi took two food samples X and Y in separate test tubes. She added 2-3 drops of Benedict’s solution in food sample X and heated it while she added two drops of copper sulphate solution and few drops of caustic soda solution in food sample Y. She observed that sample X turned brick-red while sample Y turned purple.
Which of the following is correct regarding X and Y?

A X consists of protein while Y consists of starch.
B X consists of sugar while Y consists of protein.
C X consists of starch while Y consists of protein.
D X consists of sugar while Y consists of starch.


Ans 1:

Manisha Vichare from Dcv, Mumbai
Class : Class 7
The answer is actually C because starch consists of carbohydrates and sugars, but sugars is not the exact answer.

Ans 2:

MIHIKA RAUT from ST JOSEPHS SCHOOL, RIHAND NAGAR
Class : Class 7
the correct answer is B

Ans 3:

S SAHITHYAA RAMAN from Padma Seshadri T Nagar, Chennai
Class : Class 7
Answer is c

Ans 4:

RICHIK MOULIK from Oxebow English School, ASHOKNAGAR
Class : Class 6
B is the correct answer

Ans 5:

satwik patnaik from DPS Rourkela, Rourkela
Class : Class 7
answer is b

Ans 6:

Himmat Singh from r.p.s school, Mohindergarh
Class : Class 7
The correct answer is b

Post Your Answer

ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Rohit performed an experiment wherein he set up three test tubes as shown in the figure. Select the INCORRECT statement regarding this.


ATest tube P will have most carbon dioxide after three hours.
BTest tube Q will have least oxygen after three hours.
COrganisms in test tube R will survive for a longer time as compared to organisms in test tubes P and Q.
DNo oxygen will remain in test tube P after some time.


??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

Ans 1:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi
Class : Class 4
B

Ans 2:

Ainesh das from Chrysalis, Bangalore
Class : Class 4

Ans 3:

avighna wuthoo from The bishop school , PUNE
Class : Class 5

Ans 4:

Bushra aslam from uttam, Ghaziabad
Class : Class 4

Ans 5:

PARTH MEHTA from Nov rachna school, Vadodara
Class : Class 3

Post Your Answer

ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Ans 1:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
why stomata?

Ans 2:

adhiraj chaudhary from apeejay school noida, noida
Class : Class 3

Ans 3: (Master Answer)

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

Ans 4:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi
Class : Class 4
d

Ans 5:

adhiraj chaudhary from apeejay school noida, noida
Class : Class 3
the correct answer is d

Ans 6:

vivaan sethi from GD goenka public school, Delhi
Class : Class 4
Ans is D

Post Your Answer

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

Ans 1:

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

Ans 2:

kpks14 from RIMT World School, Chandigarh
Class : Class 7

Ans 3:

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

Ans 4:

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

Ans 5:

Veda Dua from DPS R K PURAM, New Delhi
Class : Class 7

Ans 6:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 6

Ans 7:

Dushyant Singh from Shree Ram Centenial School, Indore
Class : Class 6
sof has given c which is wrong

Ans 8:

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 9:

from Sri Chaitanya Techno School, Bengaluru
Class : Class 9

Ans 10:

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

Ans 11:

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

Ans 12:

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 13:

from Sri Chaitanya Techno School, Bengaluru
Class : Class 9

Post Your Answer

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

Ans 1:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 8
C

Ans 2:

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 3:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 8

Ans 4:

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

Ans 5:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 8

Ans 6:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 8
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 7:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 8

Post Your Answer

chandra Deb from ,
Subject :NSO    Class : Class 5

Ans 1:

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

Ans 2:

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

Ans 3:

Pragun goel from Venkateshwar International School, Delhi
Class : Class 6
sea snakes also breathe through skin so option 1 should also be correct.

Ans 4:

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

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:

from , Jamnagar
Class : Class 7

Ans 2:

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

Ans 3:

Anand Agarwal from stems, kuchinda
Class : Class 7

Ans 4:

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

Ans 5:

aryan vir from lotusvalley international school gurugram, Gurgaon
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:

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

Ans 8:

Arush from Anandi Public School, Udgir
Class : Class 3

Ans 9:

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

Ans 10:

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 11:

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

Post Your Answer