Here is a mathematical expression that also secretly tells a movie name. What movie is that?

I cannot talk, but I always reply when spoken to. What am I?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

I am quite hot but become too cold if you remove the first two letters. What am I?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What is the word or phrase?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

Find the value of "?" in the ball picture Riddle below: