How many words can a pen with half refill write?

What time is it when an elephant sits on a fence?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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

What does Alexander the Great and Winnie the Pooh have in common?

In the given picture, in how many ways can you read the word "Tiger"?

What has many keys but can’t open a single lock?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

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