Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

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

They are three errirs in this question. Can you find them?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

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

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

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