# IOQs Discussion

This discussion is mainly for the NSEs, including NSEP, NSEC, NSEJS, NSEB, NSEA held in India. However, anyone who wants to practice good Science questions, you are welcome! Edit : IOQ instead of NSE. The rules are:

• Post problems related to Science

• Don't post repeated problems(I mean if someone has posted it already, don't post again).

• Past year problems are also welcome.

• Don't post comments not related to any problem.

• If you are not posting a problem yourself, and find a good problem in the Community(old or new), please post it here.

• If you learnt any new concept, do share it with us!

• I request everyone to please share the links of the previous deleted discussion.

• Let's together learn Science!

Note by Vinayak Srivastava
6 months, 2 weeks ago

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

• Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
• Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
• Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold
- bulleted- list
• bulleted
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1. numbered2. list
1. numbered
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Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1paragraph 2

paragraph 1

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[example link](https://brilliant.org)example link
> This is a quote
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    # I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in $$ ... $$ or $ ... $ to ensure proper formatting.
2 \times 3 $2 \times 3$
2^{34} $2^{34}$
a_{i-1} $a_{i-1}$
\frac{2}{3} $\frac{2}{3}$
\sqrt{2} $\sqrt{2}$
\sum_{i=1}^3 $\sum_{i=1}^3$
\sin \theta $\sin \theta$
\boxed{123} $\boxed{123}$

Sort by:

- 1 week ago

LOL I qualified from UP with only 48 marks, but I will get 0 in INJSO anyway. :)

- 1 week ago

- 1 week, 4 days ago

All the best to everyone giving the Senior IOQs!

- 3 weeks ago

Hey @Vinayak Srivastava, I did not give IOQM this time because of my jee prep., is it better to give it in class 12, or should I leave it??

- 2 weeks, 6 days ago

But, if you have never appeared in IOQM/PRMO, then I'll say it's a worthy experience to give and prepare for it. But if you want to give, don't do too much preparation as it will affect JEE and also don't do zero preparation as demotivation is quite bad. I have experienced demotivation in 9th. :)

- 2 weeks, 6 days ago

Hi. IOQM is suitable to give only till class 11th, as it's syllabus is quite different from JEE syllabus and so you have to divert your attention to IOQM which might be bad for JEE. Also, I feel it's never worthy to give exams without preparation as it becomes quite a demotivation if we don't do good, which is bad at a crucial time of JEE. So, in my opinion, I think you might leave it. :)

- 2 weeks, 6 days ago

@Dibyojyoti Bhattacharjee You are eligible for it until Your age $\leq 19years$

- 2 weeks, 6 days ago

In my opinion, it's always a good idea to give any exam. No matter what the result is, or how much you were prepared for, it will give you a unique experience and teach you something. Now if someone is not at all interested in Biology or Physics, then it is obviously a futile thought to give or even prepare for its respective exam. But if you are really interested in mathematics, then sure, go ahead. I would! For preparation, decide your priorities first. Is JEE prep more important or PRMO? it's most probably JEE that's important. Then preparing for PRMO rigorously is not a good idea. You can still search for problems occasionally or solve some problems every night. Anyways, I would suggest you give the exam! Hope this helps.

- 2 weeks, 6 days ago

Hey! I don't think I am the best person to answer this, I think you should ask others more experienced and then decide. Sorry. I am mentioning few people whose opinion may help you: @Zakir Husain, @Aryan Sanghi, @Siddharth Chakravarty, @Mahdi Raza

- 2 weeks, 6 days ago

I am myself busy with the JEE and SAT prep 😅

- 2 weeks, 6 days ago

What is your SAT date? 13 March?

- 2 weeks, 6 days ago

I also have 1 doubt in Vertical Circular Motion. Any help will be highly appreciated.

If in a vertical circle, the velocity at lowest point is $\sqrt{2gR}$ [$R$ is radius of circle] then after reaching the horizontal point, what will happen to the particle? Will it continue in the semi-circular arc, will it fall freely in straight line, or fall like a projectile?

- 1 month, 1 week ago

Look the velocity at any height h from the lowest point is $\sqrt{u^{2}-2gh}$ where u is the velocity at the lowest point. So at the horizontal point, it is at a height h=R from the lowest point and the initial velocity is $\sqrt{2gR}$ as per you, so the velocity at the horizontal point should come out to be 0, which means the particle is at rest there but still gravity would act on it, and it will again fall down, and then go on the opposite side, come back down, and so on, and thus the system becomes a pendulum.

- 1 month, 1 week ago

- 3 weeks, 4 days ago

All the best to everyone giving IOQM and/or IOQJS tomorrow!

- 1 month, 1 week ago

Ya thanks!!!!!!

- 1 month, 1 week ago

Try this problem by me Edge Case Of Rolling!!

- 3 months, 3 weeks ago

Try this problem by me Bouncy Bouncing Balls!!

- 4 months ago

- 4 months, 1 week ago

@Vinayak Srivastava,Have you tried the problem?

- 4 months, 1 week ago

- 5 months ago

- 5 months, 2 weeks ago

- 5 months, 2 weeks ago

Thanks you sir for awaring this to all.

- 5 months, 2 weeks ago

You mean - "Thanks sir, for bringing this to our notice" or "Thank you sir, for sharing this with us". Bad grammar is the reason most fail their English exams @SRIJAN Singh, but not me, I have a Business English degree :)

- 5 months, 2 weeks ago

I was in hurry,little bit weak in english btw the notice is non of @Percy Jackson business because it is for Indian exams

- 5 months, 2 weeks ago

Ya I know bud, but as a person with a Business English degree I'm supposed to correct others English to annoy them :)

- 5 months, 2 weeks ago

Yup! Percy Jackson

- 5 months, 2 weeks ago

Thanks for teached of English grammer, I hope that these will turned out to be very usedful to ours, because I has pretty weak on the English subject. LOL, I realised now how long does it take to write something incorrect.

- 5 months, 2 weeks ago

LOL its super-hard to get something incorrect if you know how it is correct. Used to typing the correct words I guess lol

- 5 months, 2 weeks ago

- 5 months, 2 weeks ago

Try this

- 5 months, 2 weeks ago

@Vinayak Srivastava,you might like this

- 5 months, 3 weeks ago

Nice, but easy. Pure logic is enough to solve it. Though I must point out @Kriti Kamal, that leaves are not exactly green, rather they appear green due to the green pigment chlorophyll present in the chloroplasts. This is because leaves can be other colors as well. These kind of leaves just have chlorophyll in minority compared to the other colored pigments. Though this doesn't change the answer.

- 5 months, 3 weeks ago

if it does not changes the answer,then i will not argue with you。

- 5 months, 3 weeks ago

It doesn't change the answer, but it deems your solution to be partially wrong. This is not an argument. Stating facts that are only partially right is a flaw in the solution, so your solution is imperfect, but you can change it, if you wish to, which in my opinion you should, but then again, that's my opinion. @Kriti Kamal

- 5 months, 3 weeks ago

- 5 months, 3 weeks ago

No problem :)

- 5 months, 3 weeks ago

This might help

- 5 months, 3 weeks ago

Great thank to @Zakir Husain for giving his support towards the young wonders including me

- 5 months, 3 weeks ago

Please see this problem and please post a solution : May the Potential Energy be with you!

- 5 months, 3 weeks ago

Try this problem Moving Wedge

- 5 months, 4 weeks ago

New problem: A constrained pulley!

- 5 months, 4 weeks ago

- 5 months, 4 weeks ago

Try this problem instead Graphical Mechanics (part 4)

- 6 months ago

Try this problem Graphical Mechanics (part 3)

- 6 months, 1 week ago

No, we thought we would think about it together :( Maybe Pt.4

- 6 months, 1 week ago

Ohk. We'll think of part 4 together. :)

- 6 months, 1 week ago

Btw, check I posted the problem I gave to you Link

- 6 months, 1 week ago

I solved it......

- 6 months, 1 week ago

Please post a solution then :)

- 6 months, 1 week ago

Ohk...... I'll post it tomorrow....... Going to sleep. :)

- 6 months, 1 week ago

Try this problem Graphical Mechanics!! (Part 2)

- 6 months, 1 week ago

- 6 months, 1 week ago

no,@Vinayak Srivastava wants book

- 6 months, 1 week ago

No, I need questions. Others may need books, some may need these websites.

- 6 months, 1 week ago

Uhh.....don't the papers have questions @Vinayak Srivastava ?

thinking to myself : do they?

- 6 months, 1 week ago

Yes, but they are Previous Year Questions, I want original ones. I will solve PYQs in the end.

- 6 months, 1 week ago

Ok (some text)

- 6 months, 1 week ago

bro ,if you will not have books then how will you do questions

- 6 months, 1 week ago

I have books already, I don't want more. @Siddharth Chakravarty has also given a lot of books, it will take me many years to read them lol

- 6 months, 1 week ago

- 6 months, 1 week ago

He never specified that, but lmgtfy :)

Actually, @Vinayak Srivastava can find atleast a million things like this on Google, so he can Google it himself, so lmgtfy doesn't work here :)

- 6 months, 1 week ago

@Vinayak Srivastava - NSE stuff links :)

- 6 months, 1 week ago

@Percy Jackson.do you have some books that are effective for nse's

- 6 months, 1 week ago

I'm not much of a book guy. And NSE's are Indian competitions bro.

PS - Today is August 18th, a very special day. Google if you want. @SRIJAN Singh

- 6 months, 1 week ago

yes, books bore me also, I like questions.

- 6 months, 1 week ago

Same (some text)

- 6 months, 1 week ago

why,which day is today

- 6 months, 1 week ago

Google the relation between today and Percy Jackson :)

- 6 months, 1 week ago

I have a 30GB folder on stuff like this for science, math and more. How do I send it to you though @Vinayak Srivastava???

- 6 months, 1 week ago

can you share to me

- 6 months, 1 week ago

- 6 months, 1 week ago

Bro you have drive ?

- 6 months, 1 week ago

No I don't have a car LOL yes I have drive, but I can't send to some person I don't know from Google Drive :)

- 6 months, 1 week ago

have you store all the books in drive?

- 6 months, 1 week ago

- 6 months, 1 week ago

Try this problem Graphical Mechanics

- 6 months, 2 weeks ago

@Vinayak Srivastava.hey have you understood the high level science or mathematics

- 6 months, 2 weeks ago

?? Means?

- 6 months, 2 weeks ago

means have you read something in science and mathematics (special folder link) and understood

- 6 months, 2 weeks ago

No, I haven't read anything, I'll see to in in a few days when my school exams are done.

- 6 months, 2 weeks ago

It is effective bro I am reading that only (now)

- 6 months, 2 weeks ago

hey Tell me something about Neeraj(Oi doug)

- 6 months, 2 weeks ago

@Vinayak Srivastava @SRIJAN Singh Check the link now, I have uploaded separate files in the folder 'Books'.

- 6 months, 2 weeks ago

Thank you! I will download a few today, I see there is a very big collection of books!

- 6 months, 2 weeks ago

nice @Siddharth Chakravarty.Thanks for your support towards young one's

- 6 months, 2 weeks ago

- 6 months, 2 weeks ago

@Siddharth Chakravarty.hey what have you inserted in (special folder link) ? and give some more books of maths and science

- 6 months, 2 weeks ago

@Siddharth Chakravarty. how much megabytes does (special folder link) is?

- 6 months, 2 weeks ago

A little less than 2000 mb

- 6 months, 2 weeks ago

- 6 months, 2 weeks ago

yeah ! at 1.76 GB my internet interepted @Siddharth Chakravarty

- 6 months, 2 weeks ago

Ok @Vinayak Srivastava and @SRIJAN Singh I will make different folders and upload

- 6 months, 2 weeks ago

When

- 6 months, 2 weeks ago

I am working on it, I will let you all know.

- 6 months, 2 weeks ago

- 6 months, 2 weeks ago

These lecture may be helpful in physics :

Classical mechanics

- 6 months, 2 weeks ago

(Posting my comment again)

@Vinayak Srivastava here is a special folder link for you, and anybody who wants it. I have added some books which are interesting and explain the concepts very well along with some problem-solving tricks. It contains Physics, Maths and Chemistry books. I have a lot more books, let me know if you want. Others can find it useful too, I have added some of my university books also

- 6 months, 2 weeks ago

@Siddharth Chakravarty, while opening the link, my name appears in the folder name, even though the folder is yours. Have you only named it like that, or it happens with everyone? I am using Drive for first time, so I am asking, as I want to know more about Drive. Also, can you tell which software I can use to extract as a zip and download? And If you have named it mine, please remove it, I am not the author of the books, and I haven't worked as hard as you to collect the books, as I don't like seeing my name in something I haven't done, you should write your name instead, as you have done the $F \cdot S$. \begin{aligned} &~~~\LARGE{\cdot \cdot} \\ &\Huge{\smile} \\ \end{aligned}

- 6 months ago

- 6 months ago

The extracting works, thanks for that! It downloads directly also, I see now, but it takes more data.

- 6 months ago

@Vinayak Srivastava,@Siddharth Chakravarty..As i open the folder and if I click on book section it isn't opening ..if vinayak has the same problem ...so make a solution for this.

- 5 months, 4 weeks ago

But @Vinayak Srivastava said he downloaded the books, and plus I also don't face any problems. Maybe you are having some problem, explain what is going wrong while opening so I can understand and suggest what to do.

- 5 months, 4 weeks ago

No worries it's opening now .There was some of the servers down from google

- 5 months, 4 weeks ago

I don't like seeing my name in things I haven't done, please name it "Brilliant books" or something like that, I request you. Also, how do you know my middle name?

- 6 months ago

Ok I will change the name, once I get access to my laptop.

- 6 months ago

- 6 months ago

Lol.The name appears on my side also .extract with zip

- 6 months ago

What? 1.9 GB in zip? How do I convert it? lol

- 6 months, 2 weeks ago

Download the zip, and then you will see the folders in the zip. You can use apps like WinRAR to extract it.

- 6 months, 2 weeks ago

Ok, then I'll download tomorrow, I don't have that much net today.

- 6 months, 2 weeks ago

In google drive, you might see some third-party app to just see what's inside the zip, for now.

- 6 months, 2 weeks ago

I tried, its not working, I'll see tomorrow, thanks!

- 6 months, 2 weeks ago

No worries either :)

- 6 months, 2 weeks ago