What occurs twice in a week, once in a year but never in a day?

Can you name some countries which do not have the alphabet 'A' in them?

What does the rebus below mean?

TEN BADTION

Can you solve the maths in the below-given picture equation?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

The more you take me, the more you leave me behind.
Who Am I?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?