I can be found in seconds, minutes and centuries, but not in days, years or decades.
U always follow me but I am rarely seen. What am I?See answer
What is black when it is clean and white when it is dirty?See answer
I am million people's wakeup call. What am I?See answer
Select a pack of riddles and try to solve it in an interesting way.
This riddle appears in the following downloadable PDF files: