I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

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

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

John, Jack and Jill are in a desert. John doesn't like Jill and hence decides to murder him. He poisons the water supply of Jill. Since it is a desert area, Jill must drink or he will die of thirst.

Jack does not know of the actions of John and also decides to murder Jill. To succeed in his ill motives, he removes the water supply of Jill so he dies of thirst.

Jill dies due to thirst. Who murdered Jill?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

What will you call your mother's brother's brother-in-law?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Can you name some countries which do not have the alphabet 'A' in them?

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

How many letters are in the alphabet?