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

User Forum

Ask Your Question
ADVAITH KRISHNAN from SHISHUKUNJ INTERNATIONAL SCHOOL, INDORE
Subject :NSO    Class : Class 7

Which of the following statements are correct?
I. The tangy taste of cola drinks is due to carbonic acid which is an organic acid.
II. Inorganic acids are prepared artificially in the industries and are extremely corrosive.
III. Hydrochloric acid reacts with metals to varying degrees therefore, it is stored in glass bottles.
IV. Organic acids are weak acids and are used as food supplements.

A I, II and III only
B I and IV only
C II and IV only
D All of these


Why is carbonic acid inorganic even though all organic acids have carbon in their formulae and H2CO3 is the formula of carbonic acid?

Ans 1:

Chaitanya L K from SKCHEC, bangalore
Class : Class 7
hcl reacts with metals too

Ans 2:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 8
Hcl reacts with metals also

Ans 3:

Tejas Agarwal from Amity International School , Noida
Class : Class 7
Q is wrong since option 1 is false, rest all are true

Post Your Answer

Anhiti Mandal from Shri Ram School, Gurgaon
Subject :NSO    Class : Class 7

Ans 1:

Amol Athawale from WoodRidge High, Mumbai
Class : Class 7
i gave the correct answer but in the result they are showing that it is wrong.it is the same case with some other questions too.Please make a note that you correct it,thank you.

Ans 2:

Amol Athawale from WoodRidge High, Mumbai
Class : Class 7

Post Your Answer

A Ramakrishna Rao from D A V Public School. Unit 8. Bhubaneswar , Bhubaneswar
Subject :NSO    Class : Class 5

Ans 1:

Rohan David from Oakridge International school, Hyderabad
Class : Class 5
The answer is D because the stapler is the odd one out

Ans 2:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5
yes because the stapler is a third class lever

Ans 3:

Niveideeta Cour from Suncity World School, Gurgaon
Class : Class 5

Ans 4:

D Murari from Indian School of Excellence, Bangalore
Class : Class 5

Ans 5:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 5

Ans 6:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 5
Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .

Post Your Answer

Sarthak yadav from RPS, mahendergarh
Subject :NSO    Class : Class 4

Ans 1:

shibin joseph from ,
Class : Class 3

Post Your Answer

M.MEYYAPPAN from DPS, Bhilai
Subject :NSO    Class : Class 8

Ans 1:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

Ans 2: (Master Answer)

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

Ans 3:

kd from st Jude's academy , sonipay
Class : Class 8
A

Post Your Answer

jeeva from Kendriya Vidyalaya Kottayam, Kottayam
Subject :NSO    Class : Class 8

Post Your Answer

archana from carmel, nahan
Subject :NSO    Class : Class 3

Ans 1:

Arrunabh from Delhi public school, Indore
Class : Class 3
i m not getting the answer

Ans 2:

Smita Roy from Nava Nalanda Santiniketan Shakha, Bolpur
Class : Class 3
D

Post Your Answer

HARSHAL KUTE from cambridge school buldhana, Buldhana
Subject :NSO    Class : Class 6

Ans 1:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 2:

Sharmi Chowdhury from G.D Birla Centre For Education , Kolkata
Class : Class 7
I agree with you

Ans 3:

tanmay chaudhry from BAL BHAVAN PUBLIC SCHOOL, New Delhi
Class : Class 4
yes I also agree with you

Ans 4:

Joe from St.Vincent pallotti, Bangalore
Class : Class 6

Ans 5:

Aarush Laddha from NCFE, bengaluru
Class : Class 6
It should be T/21 only as T is the total time and no of times it passes Y is 21.Therefore the answer is T/21

Ans 6:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 7:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

Ans 8:

mayank mili from delhi public school, golaghat
Class : Class 6

Post Your Answer

HARSHAL KUTE from cambridge school buldhana, Buldhana
Subject :NSO    Class : Class 6

Ans 1:

HARSHAL KUTE from cambridge school buldhana, Buldhana
Class : Class 6
How in processes v condensation came?

Ans 2:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
The answer can be B and D both.

Ans 3:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai
Class : Class 6
gas to solid is deposition and opposite is sublimation ans wrong

Ans 4:

Bhabani Prasad from Narayan School, Kolkata
Class : Class 6
We can express process v as deposition and how did condensation and freezing get involved

Ans 5:

ADRIJA BANERJEE from KANAURIA GANGABAUX BHARTIYA VIDYA BHAVAN, KOLKATA
Class : Class 6
I do agree with Bhabani prasad

Post Your Answer

Pranat from LVIS, Noida
Subject :NSO    Class : Class 5

Shred a paper in tiny pieces. Take a comb and comb your hair. Now bring the comb closer to the paper pieces. What will you observe?

A The paper pieces will get repelled due to magnetic force.
B The paper pieces will get repelled due to electrostatic force.
C The paper pieces will get attracted and stick to the comb due to electrostatic force.
D The pieces will get attracted and stick to the comb due to frictional force.


Ans 1:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 7
The correct ans is option C because electrostatic force is a non contact force which is similar to magnetic force and the comb is like a magnet and tin pieces of paper are like the metal here (So the comb will attract the tiny pieces of paper).

Ans 2:

Shivangi from St. Michael's High School, Patna
Class : Class 5
The answer is C

Post Your Answer