Easy Riddles

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?

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?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

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

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

There is something which is always coming but never arrives?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

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

Can anyone tell me a word in the English dictionary which has a silent 'z'?