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

O_er_t_o_

Complete the missing letters of the given word.

If an electric train is travelling south, then which way is the smoke going?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word 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?

I am white when I am dirty, and black when I am clean. What am I?

What you cannot hold but it is yours?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?