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

If your uncle’s sister is not your aunt, what relation is she to you?

A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?

You can hear me, but you can't touch or see me.

What am I?

If you say my name, I will no longer exist. What am I?

What is the centre of gravity?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?