Why is the Hole below a Lock?

What has no start, end, or centre?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Find out the number of circles in the given picture having Illusion

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

I have eight fingers and two thumbs but I do not live. What Am I?

What kind of storm is always in a rush?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?