National Science Olympiad Forum By SOF Olympiad Trainer - Page 704
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ADVAITH KRISHNAN from SHISHUKUNJ INTERNATIONAL SCHOOL, INDORE
Subject :NSO    Class : Class 7

Ans 1:

Antareep Mukherjee from New Horizon Public School, Bangalore
Class : Class 8

Ans 2:

Deeksha Mittal from JAYPEE PUBLIC SCHOOL, NOIDA, NOIDA
Class : Class 6
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Ans 3:

Anu Elizabeth Alexander from Sishya, Chennai
Class : Class 8

Ans 4:

Akshay Jha from DPS NERUL, Navi Mumbai
Class : Class 7
Yes, I also agree. HCl is a strong acid and reacts with metals almost exactly like H2S04, it is also stored in glass for this reason, question is wrong.

Ans 5:

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

Ans 6:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10
Hcl doesen't react with metals......Sulphuric acid does

Ans 7:

Chaitanya L K from SKCHEC, bangalore
Class : Class 8
hcl reacts with metals too

Ans 8:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Hydrocloric acid is very corrosive and reacts with metals . So HCL is stored in glass bottles because it dont causes damage to it . ..........SO 3 statement should be true and their explanation is wrong .

Ans 9:

Ahan Biswas from National Public School, Bangalore
Class : Class 8
Hydrochloric acid reacts with metals and corrodes them and is therefore stored in glass bottles... This question is wrong and so is the explanation.

Ans 10:

dhairya mittal from vidyashram international school jodhpur, Jodhpur
Class : Class 5
You all are correct

Ans 11:

Akshara from NPS, Bengaluru
Class : Class 8
I completely agree... The HCl reacts with metals , which is major reason of why HCl is stored in glass bottles..

Ans 12:

Ankush Ghosh from DPS, Doha
Class : Class 10
Hcl doesnt react with glass. The explanation is wrong

Ans 13:

Aarnavi Mann from Scholars rosary Sr. Sec. School, Rohtak
Class : Class 8
Inorganic acids such as minerals acid like HCL , H2SO4 etc . Are. Not always made in factories . HCL is produced in our stomach.

Ans 14:

Avaneesh Sai Vemparala from The knowledge habitat, Pune
Class : Class 3
Hcl reacts with metals also

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

Ans 1:

Amol Athawale from WoodRidge High, aurangabad
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, aurangabad
Class : Class 7

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

Ans 1:

SARVESH RAMESH from DPS MIS, QATAR
Class : Class 10

Ans 2:

D Murari from Indian School of Excellence, Bangalore
Class : Class 9

Ans 3:

Shruthi from VIBGYOR, Mumbai
Class : Class 6
What is type of Option A?

Ans 4:

Rohan David from Oakridge International school, Hyderabad
Class : Class 7
The answer is D because the stapler is the odd one out

Ans 5:

Risha Jakhotiya from Indo Scott Global School, Pune
Class : Class 3
D

Ans 6:

siri from Vibgyor, Bangalore
Class : Class 7
according to Google stapler is a third-class lever

Ans 7:

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

Ans 8:

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

Ans 9:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 10:

Kavin Karthick M from DPS bangalore east, Bengaluru
Class : Class 6
option D is correct because stapler is 3rd class lever

Ans 11:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .

Ans 12:

Advik Wakchoure from The Shriram Universal School, Dombivli
Class : Class 5
Yes option d is correct

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

Ans 1:

Adnan from Nilgiri hills public school , Noida
Class : Class 5
I was thinking about body building food

Ans 2:

shibin joseph from ,
Class : Class 3

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

Ans 1:

Arnav Diwan from F.A.I.P.S Kuwait, Kuwait
Class : Class 10
it is A as fertilizers are soluble in water. You might have heard that fertilizers flow into the river and cause eutrophication it flows into river because it is soluble in water

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

Ans 4:

aditya arora from Heritage Experiential Learning School, gurugram
Class : Class 8
A

Ans 5:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

Ans 6:

SpaceXX from indian school sohar, Muscat
Class : Class 9
The correct answer is B because manure is soluble in water but it is absorbed very slowly

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

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

Ans 1:

Sagnik Roy from Nava Nalanda Santiniketan Shakha, Bolpur
Class : Class 8
D

Ans 2:

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

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

Ans 1:

Mayank Mili from Delhi Public School, Golaghat
Class : Class 9

Ans 2:

Jaidev Chowdhary from Shamrock International School, VIJAYAWADA
Class : Class 8

Ans 3:

Kashvi Rawat from Gear Innovative International School, Bengaluru
Class : Class 3
The answer is right - it should be T/10

Ans 4:

pranavramesh from sri chaitanya techno school, Chennai
Class : Class 6
it should be t/21

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:

Devabhrith from Delhi Public School Electronic City Bangalore, Bengaluru
Class : Class 8
Hi The Answer is T/10Sub To my YT:SkyPeRtan Wolf

Ans 7:

DEEPTANGSHU DATTAGUPTA from DPS South Bangalore, BANGALORE
Class : Class 8
Here, in this example, the pendulum passes through y 21 times. So, it will do 10 complete oscillations and 1 half which is basically touching y. Therefore, the time period of the pendulum is T/10.

Ans 8:

Yashraj Namdev Deshmukh from Sahyadri English School, Loha, Nanded
Class : Class 8
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Ans 9:

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 10:

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 11:

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

Ans 12:

Anika Saha from New Town School, KOLKATA
Class : Class 6
throughout the time period or the 21 swings the pendulum will pass through the point Y 21 times. so the answer is B(t/21)

Ans 13:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
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Ans 14:

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 15:

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

Ans 16:

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

Ans 17:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Yes it should be t/10 as the pendulum will pass through point y twice in its one revolution...... so the the time period should be t/10

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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:

Tanmay 2009 from MVN Aravali Hills, Faridabad
Class : Class 6
The answer is not B

Ans 3:

KEERTHANA SHIBU from INDIAN SCHOOL GHOUBRA, Oman
Class : Class 7
NA

Ans 4:

Mayank Das from Army Public School Bolaram, Hyderabad
Class : Class 2

Ans 5:

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

Ans 6:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
I ALSO AGREE WITH YOU ALL

Ans 7:

Aarav Chopra from Springdales School, New Delhi
Class : Class 7
it is a direct change, so it does have to turn into liquid state

Ans 8:

Mayank Das from Army Public School Bolaram, Hyderabad
Class : Class 2

Ans 9:

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

Ans 10:

RICHA BORAH from K V ANNA NAGAR, CHENNAI
Class : Class 7
I also agree with all of you . That's just impossible, I guess.

Ans 11:

Aarav Chopra from Springdales School, New Delhi
Class : Class 7
same

Ans 12:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Answer is B because to turn Water vapour into ice you need Deposition but water vapour cannot be deposited that is why you first need to turn the water vapour to water by condensation and then to convert water to ice you need freezing . Hence answer B is correct

Ans 13:

Agasthya S Ramkumar from Oakridge Internatioal School, Hyderabad
Class : Class 7
easy

Ans 14:

malhar thorve from city internqtional school, satara road, pune
Class : Class 7

Ans 15:

Aarav Chopra from Springdales School, New Delhi
Class : Class 7
ya

Ans 16:

Rasha Ranjan from DPS NOIDA , Vaishali
Class : Class 6

Ans 17:

Sai Srivardhan from Maharishi Vidya Mandir Chetpet, Chennai
Class : Class 9
In process v, actually sublimation takes place

Ans 18:

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

Ans 19:

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 20:

Anamkhan Mulla from Navrachna Sama, Vadodara
Class : Class 7
easyyyyyyyyy

Ans 21:

Agasthya S Ramkumar from Oakridge Internatioal School, Hyderabad
Class : Class 7
Guys you are wrong process name is deposition but you need to cool it to water then freeze it

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

Ans 1:

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

Ans 2:

Lakshana from SBOA School and Junior College, Chennai
Class : Class 6
it can also be said as static electricity

Ans 3:

Adeeth Baasu from Greenwood High, Bangalore
Class : Class 8
The answer is C

Ans 4:

Vaibhav Elisetti from sri chaitanya techno school Nallagandla, Hyderabad
Class : Class 7
yup

Ans 5:

aadav sagar from indian school al ghubrah , muscat
Class : Class 6
6536e6w33346si7s7474r6ssxfge65eueskibidyohio fanomtax rizzler

Ans 6:

Tanmay kaushal from ICSE, Mumbai
Class : Class 5
Class :C

Ans 7:

Pratham Dave from GNS, Bangalore
Class : Class 7
I prefer option C

Ans 8:

Priyanshi Dubey from Ryan International school kandvali, Mumbai
Class : Class 7

Ans 9:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
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 10:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
C

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