What does this rebus riddle means ?

The King of a distant land had heard that Birbal was one of the wisest men in the East and so desired to meet Birbal. He sent Birbal an invitation to visit his country.

In due course, Birbal arrived in the distant kingdom. When he entered the palace he was flabbergasted to find not one but six kings seated there. All looked alike. All were dressed in kingly robes. Who was the real king?

The very next moment he got his answer. Confidently, he approached the king and bowed to him.

How did Birbal know who was the real king?

Which letter of the alphabet has the most water?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

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?

During an interview, the interviewer ordered hot coffee for the candidate to relieve the stress. The coffee was kept before him. After a minute, the interviewer asked him, 'What is before you?' He replied 'Tea'.

The candidate was selected immediately. Why?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Can you count the number of lines in the below picture?