What does below rebus means ?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

When can we add 2 to 11 and get 1 as the correct answer?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

The cream is heavier than Milk. True or False?

Can you identify the Oscar-winning movie from the rebus below?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

Count the number of triangles in the picture below:

Where do fish keep their money?

Complete the table series riddle by finding the number that can replace "??".