John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

I make two people out of one. What am I?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

Can you replace the question mark with the correct number?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?