By what process could you make a 'Tea-Table' into food?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

What has no start, end, or centre?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

The more you take me, the more you leave me behind.
Who Am I?

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

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

What goes up but never comes down?