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

What is the Surname of Barbie Doll?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

A man plots the murder of his wife. His plan is full proof. Nobody saw them leaving their house. He stabbed her with a knife while driving. She died on the spot. He threw her body in a valley. He threw the knife carefully wiping his finger prints on a random garbage bin. Then he went back to his home and no one was watching him this time as well.

After an hour, he was called by the local police department who informed him that his wife was murdered. They asked him to reach the scene of crime immediately. But as soon as he arrived at the crime scene, he was arrested by them.

How did the police know that he himself is the murderer?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

When we see 2 but call 10?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)