With the help clues provided in the image, can you find the 5 digit key?

In the picture given below, can you find out which digit will take place of the question mark?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

A bomb exploded in a room full of married couples and no one died. How?

What brings you down but never up?

Can you solve below mathematical equation?

2^1234 - 2^1233

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

Prove that the below maths equation is true.

8 + 8 = 91