You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

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 ?