What month of the year has 28 days?

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

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

The more of this there is, the less you see. What is it?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.