@Vishal_Watsal For Question #22:
On comparing Jumping of Astronant, He will take longer times to reach the top and a longer time to come down on moon as compared to earth.
Lets assume that your legs can supply the same amount of energy to the jump anywhere.
We know that
U = mgh, which gives us h = U/mg
So we can say that h is inversely proportional to g
This explains that the height you can jump is inversly proportional to gravity. Thus on moon you will be able to jump higher as compare to the earch.
h = U/mg = W/mg
Time to fall from height h is sqrt(2h/g)
As you can see t is also inversely proportional to gravity, thus time will increase. Ans for such events the time taken to reach the top is always equal to time taken to come down from top.
For Question #32: Why you think the answer is wrong, grpah clear shows that they have used drugs, so its the incorrect statement.