@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.
@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
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.
@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 DSoo both statements arerequired
I did the question rankwise and I did not put A and D on the top ( where top being heaviest) and all others are below it. If I answer with whatever is given, I can definitely say C is heaviest.
@kohliwag from 0.49m it again hit the ground...after that it won't bounce...we have to count that also...
It would not hit the ground as height is 0.49 m. Question explicitly says if height is less than 0.5m/50 cm it stops i.e it would not bounce and the counting should stop.
Also, the other options were in line with the context of Devi Lal contesting such an election.
