What does it mean?

What's a single-digit number with no value?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

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?

How could a baby fall out of a twenty-story building onto the ground and live?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?