How many sides does a circle have?

What has one letter and starts with an E?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

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

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I am the fastest animal but cannot climb the tree. What am I?

What has to be broken before you can use it?

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?

Before Mount Everest was discovered, what was the highest mountain in the world?