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

What goes up but never comes down?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

Different lights make me strange by changing me into different sizes. What am I?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

why number 8549176320 is one of a kind?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

I have Rs.50 and I spend it in the way as below.

In the image below, can you find the value of an angle(y)

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?