Question

Laboratory preparation of hydrogen

Answer 1

put a windmill on the roof
run a dc generator with the windmill
put wires from the generator in a bucket of water
collect the gasses produced by electrolysis of the water at the two electrodes. H2 at one , O2 at the other.

Answer 2

put a query in google

Answer 3

Ingenious!!! However, just in case your laboratory doesn't have a windmill or an engineer to hook up those wires, you might try mixing Zn metal with a dilute solution of HCl to get this reaction.
Zn(s) + 2HCl(aq) ==> ZnCl2(aq) + H2(g)