What do you see in the given picture?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

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

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

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

What is the word or phrase?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

I have Rs.50 and I spend it in the way as below.

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?