What Deficiency does the below rebus represent?

VIT_MIN

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

What is the Surname of Barbie Doll?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

What word is pronounced the same if you take away four of its five letters?

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?

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