How can you make number one disappear by adding something to it?

Why is the Hole below a Lock?

Spot 5 differences in two Christmas tree below:

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Identify the 10 differences between the two given pictures.

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

Can you tell a 3D object that has just two surfaces?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?