When can we add 2 to 11 and get 1 as the correct answer?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

What goes up but never comes down?

Those who excel at picture puzzles to find hidden objects often possess keen attention to detail, high IQ, and the ability to process visual information at lightning speed.

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Which country gets ill every time?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Replace the question mark with the correct number in the below-given picture?

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