A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

What word begins and ends with an E, but has only one letter?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

What is the riddle which can be asked all day with a different correct answer each time.

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

What is more useful when it is broken?