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

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Why do we preferably have round manhole covers and not square ones?

A man was found murdered on Sunday morning. His wife immediately called the police. The police questioned the wife and staff and got these alibis: The Wife said she was sleeping. The Cook was cooking breakfast. The Gardener was picking vegetables. The Maid was getting the mail. The Butler was cleaning the closet. The police instantly arrested the murderer. Who did it and how did they know?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

What's the only room from which no one can enter or leave