What Time Should the last watch show in the below figure?

What does this rebus mean?

O
N
C
E
TIME

What does does this rebus picture means ?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Find the last number in the series below:

voN luJ yaM raM ---

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

This is a picture puzzle. You have to guess the name of the movie that can be related to the picture.

What Deficiency does the below rebus represent?

VIT_MIN

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?