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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
1.4m views

4.2k comments

Guys please suggest any one good full length mock for paper-1.. Except forum because I have given many mocks with forum and I don't want to be polarised in my preparation... 

I want to give a final full length mock before the D-day.. 


atishmathur.com 


@Purplesunbird thanks !! CA compilations on the website look really great for last-minute revision. Others can also have a look.

@HeNeArKr are you talking about final lap 3  files schemes reports and yearly

Yeah just had a cursory reading, looked useful to me! 

This is good stuff. Especially environment and economy for last minute revisions. 

3.6k views
A can do work in 30 days
B is 25% more efficient than A
How many days B will take to finish?

In one YouTube video ans is 24 but cant we apply percentage and say B will do in 22.5 days
4k views
A can do work in 30 days
B is 25% more efficient than A
How many days B will take to finish?

In one YouTube video ans is 24 but cant we apply percentage and say B will do in 22.5 days

B is more efficient so you add not subtract. the factor here would be 5/4 not 3/4. Given same duration  B will do 125 unit of work while A only 100 units


Villanelle,
3.4k views
@PursuitofHappyness Post the whole question here 


3.4k views

Arent these answers incorrect? d and a hona chahiye

3.1k views

largest Indus Valley Site Both Overall and in India?


3.6k views
@Zlatan07 Rakhigarhi


Villanelle,sstarrr
3.2k views
Q 31 - D because 13 and 17 Both has 1 and 1 remainder and it is asking for unique

Q32 - A 

What's the point of having such a huge coaching center basic question ke answer galat de rakhe hai

Dionysus,Villanelleand2 otherslike this
3.1k views

Q 31 - D because 13 and 17 Both has 1 and 1 remainder and it is asking for unique

Q32 - A 

What's the point of having such a huge coaching center basic question ke answer galat de rakhe hai

lol thats what i thought.


The letters from A to Z are numbered from 1 to 26 respectively. If GHI = 1578 and DEF = 912, then what is ABC equal to?
(a) 492
(b) 468
(c) 262
(d) 246

cant figure this one

3k views

D503said

» show previous quotes» show previous quotes» show previous quotes

lol thats what i thought.


The letters from A to Z are numbered from 1 to 26 respectively. If GHI = 1578 and DEF = 912, then what is ABC equal to?
(a) 492
(b) 468
(c) 262
(d) 246

cant figure this one

The sequence is just twice of each group’s position 

so ABC is 123x2 so D

captainhaddock,
3.2k views

D503said

Q 31 - D because 13 and 17 Both has 1 and 1 remainder and it is asking for unique

Q32 - A 

What's the point of having such a huge coaching center basic question ke answer galat de rakhe hai

lol thats what i thought.


The letters from A to Z are numbered from 1 to 26 respectively. If GHI = 1578 and DEF = 912, then what is ABC equal to?
(a) 492
(b) 468
(c) 262
(d) 246

cant figure this one out.

G=7,H=8,I=9, GHI=789 *2=1578

ABC=123*2=246

PS- I don't think these type of questions come in CSAT is it a PYQ?

3.6k views

D503said

Q 31 - D because 13 and 17 Both has 1 and 1 remainder and it is asking for unique

Q32 - A 

What's the point of having such a huge coaching center basic question ke answer galat de rakhe hai

lol thats what i thought.


The letters from A to Z are numbered from 1 to 26 respectively. If GHI = 1578 and DEF = 912, then what is ABC equal to?
(a) 492
(b) 468
(c) 262
(d) 246

cant figure this one out.

G=7,H=8,I=9, GHI=789 *2=1578

ABC=123*2=246

PS- I don't think these type of questions come in CSAT is it a PYQ?

2020 ka hai shyad :P

3.1k views

D503said

Q 31 - D because 13 and 17 Both has 1 and 1 remainder and it is asking for unique

Q32 - A 

What's the point of having such a huge coaching center basic question ke answer galat de rakhe hai

lol thats what i thought.


The letters from A to Z are numbered from 1 to 26 respectively. If GHI = 1578 and DEF = 912, then what is ABC equal to?
(a) 492
(b) 468
(c) 262
(d) 246

cant figure this one out.

G=7,H=8,I=9, GHI=789 *2=1578

ABC=123*2=246

PS- I don't think these type of questions come in CSAT is it a PYQ?

2020 ka hai shyad :P

Ohh... level badha dia h kaafi :p

Villanelle,
3.1k views

D503said

Arent these answers incorrect? d and a hona chahiye

Q32 is a reasoning question. So solve it via Venn diagram.

Even if it's a mathematics one, it is still wrong. A- {2,4,6,8...} and  B- {3,6,9,...}


sstarrr,
3.6k views

D503said

» show previous quotes» show previous quotes» show previous quotes

lol thats what i thought.


The letters from A to Z are numbered from 1 to 26 respectively. If GHI = 1578 and DEF = 912, then what is ABC equal to?
(a) 492
(b) 468
(c) 262
(d) 246

cant figure this one

The sequence is just twice of each group’s position 

so ABC is 123x2 so D

lol . brain cells stopped working


Villanelle,captainhaddock
2.7k views
» show previous quotes

G=7,H=8,I=9, GHI=789 *2=1578

ABC=123*2=246

PS- I don't think these type of questions come in CSAT is it a PYQ?

wow and i was doing every operation except simple multiplication
feelsdumb.exe


Villanelle,HeNeArKrand1 otherslike this
2.7k views
Is there any open test portal where topicwise PYQs can be practiced? Vision has only till 2015.
2.7k views

Mastersaid

Is there any open test portal where topicwise PYQs can be practiced? Vision has only till 2015.

Insights  from 2015

3k views
@PursuitofHappyness Post the whole question here 


@ArchAngel96 ....we should not apply percentages to days then?

3k views
Can someone share any document which has all the impt SC cases ? Those mentioned in Lakshmikant- kihoto holahan and all. TIA :)
2.4k views
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