Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Name a key which is hardest to turn.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?