I shave every day, but my beard stays the same. What am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

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?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

Which is the rope you never skip with?

How is the moon similar to a dollar?

Which wheel of car does not rotate when you turn your car right?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?