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

Ans 1:

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 2:

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

Ans 3:

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 4:

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 5:

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

Ans 6:

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 7:

Anu Elizabeth Alexander from Sishya, Chennai
Class : Class 8

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:

Deeksha Mittal from JAYPEE PUBLIC SCHOOL, NOIDA, NOIDA
Class : Class 6
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Ans 10:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
Hcl reacts with metals also

Ans 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

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

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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:

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

Ans 2:

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 3:

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

Ans 4:

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

Ans 5:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7

Ans 6:

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

Ans 7:

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

Ans 8:

SARVESH RAMESH from DPS MIS, QATAR
Class : Class 10

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

siri from Vibgyor, Bangalore
Class : Class 6
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:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD
Class : Class 8

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: (Master Answer)

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

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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:

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:

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 3:

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

Ans 4:

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

Ans 5:

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 6:

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

Ans 7:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
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Ans 8:

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

Ans 9:

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 10:

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

Ans 11:

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 12:

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 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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 17:

Yashraj Namdev Deshmukh from Sahyadri English School, Loha, Nanded
Class : Class 7
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HARSHAL KUTE from cambridge school buldhana, Buldhana
Subject :NSO    Class : Class 6

Ans 1:

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 2:

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

Ans 3:

Rasha Ranjan from DPS NOIDA , Vaishali
Class : Class 6

Ans 4:

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 5:

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

Ans 6:

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

Ans 7:

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 8:

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

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

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 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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

Ans 17:

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

Ans 18:

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 19:

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

Ans 20:

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

Ans 21:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

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

Ans 8:

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 9:

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

Ans 10:

aadav sagar from indian school al ghubrah , muscat
Class : Class 6
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