What word begins and ends with an E, but has only one letter?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

If you say my name, I will no longer exist. What am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

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?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

The more you take me, the more you leave me behind.
Who Am I?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

What has to be broken before you can use it?