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

What Deficiency does the below rebus represent?

VIT_MIN

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

What can you see in the middle of March and April that you can never see in any other month?

What number divided by 4 is the same as that number minus 4?

You can see three almost identical images below. Can you spot the odd one out from them?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?