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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

The answer to Q.no. 74 is 45.375?

3.8k views
@Voyager is it B? 
15.125


2.9k views
@Voyager is it B? 
15.125


Yeah can you pls explain that tree diagram? 

3.8k views

Compound Interest - P{(1+r/100)^t} = 8000*1.025*1.025*1.025 = 8615.125

SI = PRT/100 + P = 8000+(8000*2.5*3/100)= 8600

Difference is 15.125

Rashmirathi,Voyager
3.6k views
@Voyager 
1st year -SI and CI both 200


2nd -
    SI -200
    CI would be 200+2.5% of 200= 405


3rd 
    SI - 200    
    CI - 200+ 2.5% of 400

took 400 because that's the cumulative SI of prev 2 years  


Voyager,
2.8k views
@captainhaddock While you are correct in arriving at the answer, a small logical correction. The formulae that you mentioned calculate "amount" and not the interest itself. It did not matter in this case because they asked difference. Principal just cancels out. But, for eg, if they had asked ratio then it would have mattered and your answer would have gone wrong, since the question is asking about difference in CI, SI and not in the "amounts" of CI, SI. So, correct way would be:
CI= 8615.125 - 8000 = 615.125
SI= 8600 - 8000 = 600
Now, CI - SI = 15.125
in case they ask ratio it would be 615.125/600 and here you can see the difference in answers coming.


Voyager,captainhaddock
3.1k views

Yeah can you pls explain that tree diagram? 

2.5% = 1/40 


Voyager,
3.6k views
@Voyager Simple trick 
difference bw CI& SI for two years is =P(R/100)^2 & for three years =P( R/100)^2*(300+R/100)


Voyager,
2.9k views
@captainhaddock While you are correct in arriving at the answer, a small logical correction. The formulae that you mentioned calculate "amount" and not the interest itself. It did not matter in this case because they asked difference. Principal just cancels out. But, for eg, if they had asked ratio then it would have mattered and your answer would have gone wrong, since the question is asking about difference in CI, SI and not in the "amounts" of CI, SI. So, correct way would be:
CI= 8615.125 - 8000 = 615.125
SI= 8600 - 8000 = 600
Now, CI - SI = 15.125
in case they ask ratio it would be 615.125/600 and here you can see the difference in answers coming.


Yes yes of course... Just thought about answering this particular question!!

jassikamboj16303,
3.4k views

Thank you thank you 

@Rashmirathi @Hououin_Kyouma @captainhaddock @Purplesunbird 

I had taken 600 three times instead of 200! May be mind needs some rest .

captainhaddock,
3.6k views
Are we allowed to take calculators for the CSAT paper?
Shailputri,
2.7k views
Are we allowed to take calculators for the CSAT paper?

:D 

I wish! 

Omen,captainhaddock
2.7k views

Please explain your answer. 

Mine is A. Does slow down mean fall in absolute gdp? 

2.7k views

The Environment Protection Act, 1986 empowers the Government of India to

  1. state the requirement of public participation in the process of environmental protection, and the procedure and manner in which it is sought
  2. lay down the standards for emission or discharge of environmental pollutants from various sources

Official answer key says answer is 2 only. Isn't public participation a part of EPA?

2.6k views

The Environment Protection Act, 1986 empowers the Government of India to

  1. state the requirement of public participation in the process of environmental protection, and the procedure and manner in which it is sought
  2. lay down the standards for emission or discharge of environmental pollutants from various sources

Official answer key says answer is 2 only. Isn't public participation a part of EPA?

I think the first statement is specifically a part of environmental impact assessment

sstarrr,
2.6k views

Please explain your answer. 

Mine is A. Does slow down mean fall in absolute gdp? 

Yeah It should be A only. 2010 me they didn't give answer key maybe this website has given the wrong answer.

Shailputri,
2.6k views

The Environment Protection Act, 1986 empowers the Government of India to

  1. state the requirement of public participation in the process of environmental protection, and the procedure and manner in which it is sought
  2. lay down the standards for emission or discharge of environmental pollutants from various sources

Official answer key says answer is 2 only. Isn't public participation a part of EPA?

I think the first statement is specifically a part of environmental impact assessment

I know the answer is B. But reason cannot be eia as eia is itself under epa 1986. 

captainhaddock,
2.7k views

The Environment Protection Act, 1986 empowers the Government of India to

  1. state the requirement of public participation in the process of environmental protection, and the procedure and manner in which it is sought
  2. lay down the standards for emission or discharge of environmental pollutants from various sources

Official answer key says answer is 2 only. Isn't public participation a part of EPA?

EPA doesn't contain this provision specifically afaik. 

2.4k views

The Environment Protection Act, 1986 empowers the Government of India to

  1. state the requirement of public participation in the process of environmental protection, and the procedure and manner in which it is sought
  2. lay down the standards for emission or discharge of environmental pollutants from various sources

Official answer key says answer is 2 only. Isn't public participation a part of EPA?

I think the first statement is specifically a part of environmental impact assessment

Yeah I agree, but how would we know if it is not there in EPA as public participation is present in almost every act of GOI.

2.6k views
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