Questions

A Jig saw puzzle pieces are in different colors which have different shapes. 

You can put it anywhere you like but there is only one right place for it to be fit in it.

Investment and asset are really close in meaning. Investment is when you put your money in stock, bond or other financial instruments. Whereas Asset is what you own generally reffered to land, proprietorship , factory, etc.

The most important polymer present in the nucleus is DNA- the master molecule. It is a polymer of Nucleotides.

Bartholomew Diaz reached the point in 1487, which the Portuguese named Cape of Good Hope (the southern most point of Africa).

Any of the above given options can be a reason for the damage of the relationship of a couple or a two families or two friends etc...

Without trust relationship cannot be maintained, people not spending time with one another or without meeting the expectations of the opponents can also damage the relationship.

Dull means not sharp, not shining, not bright, ...

Hence, the given words are all that means the opposite of dull.