How is a fly different from a mosquito?

Find out the number of circles in the given picture having Illusion

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.

Can you find the key in the picture below?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Which is the correct shadow of the bird?

Can you name four days which start with the letter 'T'?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?