I have branches, but no fruit, trunk or leaves. What am I?

Which alphabet letter is a question?

Can you place three balls such that the equation shown in the picture holds true?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

If an electric train is travelling south, then which way is the smoke going?

What goes up but never comes down?