How can one talk without saying a single word?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

What goes up but never comes down?

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

You can see three almost identical images below. Can you spot the odd one out from them?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day