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Doubt Clearance Thread: UPSC 2021

"When in doubt, observe and ask questions. When certain, observe at length and ask many more questions."

Created this thread as a one stop solution for all members so that all the doubts wherein any conceptual clarification is required can be solved here. 

jack_Sparrow,curious_kidand122 otherslike this
1.3m views

4.2k comments

Archandsaid

jassikamboj16303said

@Purplesunbird Rural-dual, urban-only RBI


Rural except PACS. PACS is not under RBI, I think? 

Right. They are under complete control of state govt.

Archand,
2.4k views

Archandsaid

jassikamboj16303said

@Purplesunbird Rural-dual, urban-only RBI


Rural except PACS. PACS is not under RBI, I think? 

Yes, because they're not covered under Banking regulation 1949

Archand,
2.4k views
Anyone can tell about how mining auctions in india happen? I have read minerals belong to states and they should conduct auction but then coal gate scam happens where centres name comes. What's the deal? I have been confused about this since all times. Any notes on this and about minerals topic in general? 
2.4k views
@sstarrr for minor minerals, state does the auction but for major minerals like coal, central government does that.


sstarrr,sjerngal
2.7k views

jassikamboj16303said

@Purplesunbird Rural-dual, urban-only RBI


I think duality of control is still there. Only mrunal says RBI is the sole regulator now.

captainhaddock,Apollo11
2.3k views

Jurgen_kloppsaid

If you have 2 straight sticks of length 7.5 feet and 3.25 feet what is min length can you measure. (PYQ2020)

A).05 FOOT  

B).25 FOOT

C)1FOOT

D)3.25 FOOT

how to do this question 

7.5-3.25 = 4.25 this you can measure by placing 2 roads parallel to each other. after you have measured it you can use 3.25m rod again to measure 4.25-3.25 =1. mistri aise hi naapte hai XD


Jurgen_klopp,sstarrr
2.3k views

Jurgen_kloppsaid

If you have 2 straight sticks of length 7.5 feet and 3.25 feet what is min length can you measure. (PYQ2020)

A).05 FOOT  

B).25 FOOT

C)1FOOT

D)3.25 FOOT

how to do this question 

Mark a line using 7.5 feet stick. On this line place 3.25 feet stick twice. Min length would be 7.5-(3.25*2) = 1 foot.

Jurgen_klopp,sstarrr
3.1k views
Hear me out in this, I think it should be 0.25 foot - the least count
Using 7.5 and 3.25 x 2, you get 1
Using 7.5 and 3.25 x 3, you get 2.25
Using 2.25 x 2 and 3.25, you get 1.25
Using 1.25 and 3.25 you get 2
We already have 2.25 and now using 2 we can measure 0.25
*just realised that the final one isn’t needed: 1.25 and 1 can also be used 

D503,muskand3 otherslike this
2.4k views
@Jurgen_klopp 0.25 foot 
750/100 ,325/100 -taking hcf of numerators and lcm of denominators =25/100=.25 foot


D503,Jurgen_kloppand1 otherslike this
2.4k views

Rashmirathisaid

@Jurgen_klopp 0.25 foot 
750/100 ,325/100 -taking hcf of numerators and lcm of denominators =25/100=.25 foot


so this was basically n HCF qsn ! *panic intensifies


RaGa,
2.2k views

D503said

Rashmirathisaid

@Jurgen_klopp 0.25 foot 
750/100 ,325/100 -taking hcf of numerators and lcm of denominators =25/100=.25 foot


so this was basically n HCF qsn ! *panic intensifies


I discovered that recently as well, until then I also did the way people have solved in earlier responses. 

If u go through 6th maths ncert then it would appear to be a pretty regular question. I did it to basically re understand HCF and LCM, it won't take a lot of time and would boost confidence. So if u can pls go ahead and read it, I too did it about a week ago.

D503,
2.4k views
@D503 so your method is wrong?


2.3k views

Jurgen_kloppsaid

@D503 so your method is wrong?


no. but this is much cleaner. I stopped after measuring 1, you can reach the answer after 3.25-1 = 2.25 then 2.25-1 and so on


Jurgen_klopp,
2.1k views

D503said

Rashmirathisaid

@Jurgen_klopp 0.25 foot 
750/100 ,325/100 -taking hcf of numerators and lcm of denominators =25/100=.25 foot


so this was basically n HCF qsn ! *panic intensifies


I also thought it was HCF question but couldn't solve it. 

D503,
2.1k views

Universal Law is the answer

Civils Mains:2017,2018,2020,2021,Forest Mains:2021.

UK01,sjerngal
2.3k views


How to handle questions like this one here? 
Is it mentioned anywhere or should I just ignore it as a bouncer question thrown by UPSC?

2k views

sjerngalsaid


How to handle questions like this one here? 
Is it mentioned anywhere or should I just ignore it as a bouncer question thrown by UPSC?

In RS sharma these things are mentioned but  time period is not mentioned as far as I remember. 

1.8k views
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dalpha,sjerngaland2 otherslike this
1.9k views

nerdfightersaid

sjerngalsaid


How to handle questions like this one here? 
Is it mentioned anywhere or should I just ignore it as a bouncer question thrown by UPSC?

My mind says All of the above. I ask, "kyun?". It says feeling aa rahi hai. 

Feeling ne dokha de dia hai.. Answer is (c)

1.8k views
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