How many words can a pen with half refill write?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

Which English verb becomes past tense just by rearranging the letters?

Who are the happiest people in IPL match?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Which alphabet letter is a question?