Objective Questions....

We all have written so many objective exams.
Consider a situation where each question has four options –A, B, C, and D respectively.
The examiner has set all ‘A’s as correct answer.
………..
You will solve the first Question correctly and tick ‘A’
You will solve the second question correctly and tick ‘A’
You will solve the third question correctly and think a lot before ticking ‘A’ …
By the time you reach the fourth question, you will start questioning your logic. Even if you would have found the correct answer, you will hesitate before ticking ‘A’.

Why so?
I guess mathematical ‘Probability’ comes into picture here. Probability of getting all As (or Bs, or Cs or Ds) in first 5 question is far less than probability of getting 1 or 2 or 3 or 4 - As in those 5 questions.

PS : Even the little toddler studying in Std. 2 will hesitate to tick the 5th questions' answer as 'A'.
So that raises one doubt : Are we, by birth,tuned to calculate probabilty without even knowing what it is?
Think about it :)

PS PS :

Adding one more case:

Consider there are 10 questions in an exam?
If the correct answer for first 9 questions is ‘A’ and the correct answer for 10th question is ‘B’, then what will happen?
After ticking first 9 answers as ‘A’, you will think a lot before ticking ‘B’ for the 10th question.
What is the logic in this case?