What is so fragile that saying its name breaks it?

You can see it everyday, But cannot touch it at will. What is it?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

It belongs to you, but other people use it more than you do. What is it?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?