[APFC] Answerkey for APFC 2012, with Explanation, sources and analysis for All 4 series A,B,C,D Booklets

[APFC] Answerkey for APFC 2012, with Explanation, sources and analysis for All 4 series A,B,C,D Booklets

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  1. Topicwise breakup
  2. Aptitude
  3. Environment and Biodiversity (EnB)
  4. Current Affairs
  5. Economy
  6. English: Reading Comprehension
  7. English: Vocabulary
  8. Geography
  9. History
  10. Labour
  11. Polity
  12. Science
  13. Yearbook
  14. Lessons for future
  15. Cut offs for APFC 2012

Ok here goes the UnOfficial Answerkey for APFC 2012 with explanation and references for all series A, B,C and D.

  1. I’ve tried to solve the questions from standard reference sources (NCERT, India Yearbook, M.Laxmikanth, GS Manual etc) and resorted to Wikipedia/googling only as last resort.
  2. Where the source is not mentioned- assume that answer was too obvious or obtained through googling.
  3. Some answers are debatable; I’ve mentioned it at respective places and therefore I don’t make claim that mine is 100% authentic answerkey.
  4. For the aptitude questions, only answer and hints are given, full calculation and concepts will be explained in future youtube videos.

Topicwise breakup

Topic No.of Qs Source
Geography 2 2 from NCERT
Biodiversity 5 2 from NCERT
Current Affairs (GK) 6
Aptitude 8
Yearbook 8 4 of them from India Yearbook
History 9 7 from NCERT
Labour 10 5 from India Yearbook
Science 11 3 from NCERT
English 12
Economy 14
Polity 15 13 from M.Laxmikanth
Total 100 36

^”Sources” not exhaustive, but are given to show that UPSC papers don’t fall from sky, and therefore you should always refer and revise standard reference books rather than some readymade jholachhap material (a lot of that junk is flooding the market right now).


Note: The full calculations, concepts will be explained in separate youtube videos later.
1. If 20% of P = 30% of Q = 1/6 of R., then P: Q : R is :
(a) 2 : 3 : 16
(b) 3 : 2 : 16
(c) 10 : 15 : 18
(d) 15 : 10 18

2. A tree increases annually by 1/8th of its height. What will be its height after 2 years, if it stands today 64 cm high ?
(a) 72 cm
(b) 74 cm
(c) 81 cm
(d) 85 cm
Compound Interest Rate problem. Applying the formula, (9/8)^2 x 64=81 cm. Answer is C
Also refer the concept on http://mrunal.org/2012/04/aptitude-compound-interest-rate.html

3. The sides of a triangle GHL are GH= 65 m, HL = 75 m and LG=80 m. What is the area of this triangle (square meters)?
(a) 2100
(b) 2160
(c) 2200
(d) 2280
Apply Hero’s formula. Answer is D

4. Three sets of data on comparable situations are available as under :

Observation No of data Mean value Std Deviation
1 9 8 1.6
2 12 7 12
3 15 9 1.4

Considering all the data sets together, the overall mean value would be ..
(a) 7.24
(b) 7.66
(c) 8.08
(d) 8.50
This is the concept of Weighted Average. Answer is C

5. A train travels at a certain average speed for a distance of 63 km. Thereafter it travels a distance of 72 km with an average speed of 6 km/hour more than the original speed. Total time taken to complete the journey is 3 hours. What is the original average speed of the train ?
(a) 36 kmph
(b) 42 kmph
(c) 48 kmph
(d) 54 kmph
Our STD table approach. Answer is (B)

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