National Science Olympiad Forum By SOF Olympiad Trainer - Page 694
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SHAURYA RAJ from LITERA VALLEY SCHOOL, PATNA
Subject :NSO    Class : Class 3

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

Ans 1:

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

Ans 2:

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

Ans 3:

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 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:

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

Ans 6:

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 7:

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 8:

Anu Elizabeth Alexander from Sishya, Chennai
Class : Class 8

Ans 9:

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

Ans 10:

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

Ans 11:

Deeksha Mittal from JAYPEE PUBLIC SCHOOL, NOIDA, NOIDA
Class : Class 6
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Ans 12:

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

Ans 13:

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 14:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
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

Ans 2:

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.

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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 7
The answer is D because the stapler is the odd one out

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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 7:

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

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:

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

Ans 11:

SARVESH RAMESH from DPS MIS, QATAR
Class : Class 10

Ans 12:

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

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

Ans 1:

shibin joseph from ,
Class : Class 3

Ans 2:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

Ans 5:

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 6: (Master Answer)

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

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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:

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

Ans 2:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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 4:

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 5:

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

Ans 6:

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

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

Ans 9:

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 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

Yashraj Namdev Deshmukh from Sahyadri English School, Loha, Nanded
Class : Class 7
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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:

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 16:

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

Ans 17:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
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HARSHAL KUTE from cambridge school buldhana, Buldhana
Subject :NSO    Class : Class 6

Ans 1:

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

Ans 2:

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 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

Rasha Ranjan from DPS NOIDA , Vaishali
Class : Class 6

Ans 10:

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

Ans 11:

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 12:

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

Ans 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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

Ans 17:

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 18:

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

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:

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

Ans 21:

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

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