What is the longest word in the dictionary?

What do you see in the image below

Forwards I am heavy, backward I am not. What am I?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Tell me the Hindi name of a Vegetable which if we remove 1st word will become a precious Stone and by removing the last word it will become a sweet eatable.

Which word does the below Plexor means ?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

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?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?