Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What Deficiency does the below rebus represent?

VIT_MIN

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?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

John bought a new car. He has a habit of eating ice cream from a particular ice cream shop while returning home from office. Whenever, he eats strawberry ice cream, he faces no problem. But whenever, he eats chocolate ice cream, the car starts giving problem. At first, he thinks, it is just a co-incidence but when this awkward incident happens for 3-4 times, he reports this problem to the company.

The mechanic of the company checks but finds no problem at all. The next day, when he stops by to eat chocolate ice cream, the car again starts giving problem.

Can you find the possible reason?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

You need to remove two matchsticks to make the below equation true. Can you do it ?