Welcome back, my friends, to the show that never ends.
  We’ re so glad you could attend,
Come inside, come inside.
Step inside, hello!
We’ ve the least amazing show.
  You’ ll enjoy it some, we know,
Step inside, step inside.
Rest assured, you’ ll get
your money’s worth.
  Easiest puzzles in Heaven or Hell or on Earth.
If you follow me, to our speciality,
real
gimmes
for you to see,
Simplicity, simplicity.
— adapted from
Karn Evil 9 YouTube
by Emerson, Lake & Palmer
Step right up to our traveling display case and be dumbstruck by the easiest puzzles you’ll ever see.
These abysmal abominations are so mind-numbingly vapid that we cannot even expose them to air, or they will spontaneously burst into solutions.   Ooo, you could swoon abashedly. Or you could shed all dignity and dare imagine just what it would be like to try and actually solve such crude puzzles, if permitted, quicker than they solve themselves.   Or, you could answer...
What might each puzzle be anyway?
For instance, the first puzzle might be
(though you should think of another)...
a. World’s easiest paperfolding puzzle:   Divide into two areas by folding the fewest possible times.
Puzzle h has the special condition that its answer cannot also suit puzzle e.   Thus Knight’s Tour, for example, could be an answer only for puzzle e, which would be a 1×1 chessboard with a single white square, even though puzzle h could be perceived as an equivalent black square.
Only puzzles h, i and j are meant to be at all challenging to identify, the rest intended as warm-ups with room for playfulness. Some, certainly puzzle e, can represent countless of the world’s easiest puzzles.   Each puzzle is meant not only as the world’s easiest but also as the simplest, so special instructions should be minimal, or else some simpler puzzle is more likely the one represented.
$\small\sf\color{black}{Hints \! :}$ Some specimens are displayed at deliberately misleading scales.
One of these sideshow geeks has a family member locked in The trunk of trivial trials.
Easier/simpler/additional samples, as improvements or new mysteries, are more than welcome!