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[ Official ] How was the Prelims 2021 paper?

How was the paper guys ? 

jack_Sparrow,curious_kidand28 otherslike this
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4.8k comments

@kohliwag syllogism of cars chair almaihra
Which is the best key for CSAT?


assistant,
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kohliwagsaid

@mounikamouni24_h944 Ball hitting the ground was 5. You can solve it once again, it’s easy. And regarding which is heaviest, we need both the statements to solve this to say C is the heaviest.


I disagree with heaviest question. 

A and D should be before B, E and F. But since they are not heaviest, there should be one which should be

It only leaves C to be heaviest. So, one can derive C as heaviest from statement 1 only. 

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@mounikamouni24_h944 sorry I didn’t solve them


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@kohliwag for ball hitting ground I am getting 6 as answer...how it would be 5....first 6 time it will hit the ground


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@parle ji_ what is the answer for ball hitting ground


parle ji_,Aurang_mirasudar
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@parle ji_ in the statement1, the “none of them”is mentioning about BEF (as the statement is comparing A and D with BEF). If the statement could have been “all of them” then A and D also included. So statement 2 is also need. Having said the UPSC goes with the question creator. 


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Sureshot Mishit toll now So 

magnetite 124,arcot2 only,right to city 23

7.98 marks up or down 
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@mounikamouni24_h944 let me solve once again to check whether I did a mistake 


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mounikamouni24_h944said

@parle ji_ what is the answer for ball hitting ground


 I calculated it in exam. 

Drop from 1.5m

After, 1st tip pe 1.2m

After, 2nd tip pe 0.96m

After, 3rd tip pe 0.768m

After, 4th tip pe 0.6144m

After, 5th pe 0.49m 

And since it is less than 0.5m/ 50cm, the ball would stop. 

So Answer 5

kohliwag,shaanu4595684
3.6k views
@kohliwag but, one can definitely say that B, E, F have low weights than A and D (because, given). If you rank it, only A and D can be heavier than B, E, F but statement also says A and D are not heaviest so, that leaves only C. I don't think there is much doubt. 😅


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From 150 m the ball was dropped,that was first hit...after that it bounces to 120m.....I think u missed the first hit

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1 wrong

2 right. i marked C correct acc to SR but considering wrong

3 wrong

4 right. i marked all correct and convinced by vivek sir explanation. considered wrong

5 right

6 right

7 wrong

8 i dont remeber the answer but all coachings are right

9 all will be correct 

ATB

GOT8,
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@parle ji_ yes this how I solved. Answer is 5


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mounikamouni24_h944said

From 150 m the ball was dropped,that was first hit...after that it bounces to 120m.....I think u missed the first hit

I would request you mark these heights vertically on a paper and then count the no. of tips. I'm sure you will find it to be 5 tips.

I'm editing my previous answer too. It might help. 

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ball drop question. answer is 6 without a doubt
mounikamouni24_h944,
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initial hit —— came back to 1.2 m
second hit —— came back to 96 cm
third hit —— came back to 0.768
fourth hit —— came back to 0.6144
fift hit —— came back to 0.49 
and will not bounce


parle ji_,
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@parle ji_ you are right. I just solved the heaviest question. Answer should be statement 1 only. Because they already said A and D is heavier than BEF. I made a mistake. Fortunately csat won’t be a problem for me 


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@parle ji_  with only first statement we can't find solution as C can be equal to A and D as nowhere it is written as all have distinct weights. Only with second statement we can know the relation of C with A D 
Soo  both statements are
required


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@mounikamouni24_h944 inguess it is C


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