2. A time can come when we will be able to design a machine which can go on working for ever without the expenditure of energy. Is it possible ?

a) No
b) Yes
c) In due course time
d) Very soon
e) None of these

D and C can be omitted straightaway because we can not say anything about these two options presently.

B: well, one of the basics of mechanics is that to be able to do work, energy must be spent. So this can not be the answer.

A: Umm, what if the basic laws of mechanics change in future? Theories once widely accepted and acknowledged were rejected later on: e.g; Earth's orbital motion etc


E: None of these; might be a democratic answer.. I would have gone with these one, just like we get the polls on geo which has three options:

Han.
Na
Pata nahi

This is the trickiest question of the paper, i would like to see more comments on this one.