What does an Island and the letter T have in common?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?

Name a key which is hardest to turn.

Find the next number in the series below.

6 18 270 72090 ?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Do you know who was buried in John's tomb?