Test Preparation on Science Olympiad Class-7 Test Prep-2

Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to the group?

Which one number is wrong in the following series?
42, 110, 132, 210, 440, 506

Q, R, S, T, U and V are seated in a straight line facing
north. S is second to the right of T and T is second to the
right of Q. R is to the left of Q and is second to the left of
V.How many persons are seated between T and V?

B C D : F G H :: L M N : ?

Five girls took part in a race, Rajni finished before Meenu but behind Geeta. While Aruna finished before Seema but behind Meenu. Who won the race?