What is the Surname of Barbie Doll?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

Spot 5 differences in two Christmas tree below:

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

What always comes into a house through the keyhole?

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?