Solution:

Sucide

Solution:

Kid1, he was left with one rock.

Solution:

Four

three placed flat on the table in a triangle(touching each other) and put the fourth one on top of them in the middle.

Solution:

The two babies are two of a set of triplets(or even more)

Solution:

The Letter 'A' is silent in the parliament.

Solution:

Assassination
(Ass ass i nation)

Solution:

It is mentioned that 'all but fifteen pencils' were used by him. This phrase means that except fifteen, all his pencils were used.

Thus, he is left with fifteen pencils.

Solution:

No

Solution:

Since every bacterium divides into two in two minutes and we know the fact that the dish was half filled with bacteria at 3 pm, after exactly 2 minutes, all will divide into two and will fill the petri dish. Thus, the petri dish will become full at 3:02 pm.

Solution:

The clerk said that every day the password is CHANGED. Changed is the password.