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

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

It belongs to you, but other people use it more than you do. What is it?

what one word does the below rebus identifies?

A man escapes from jail using help from his girlfriend. The investigators suspect four girls of being the man's girlfriend.

Out of those four girls, one is his girlfriend who is lying. Two of the girls are completely innocent and are speaking the truth. One of the girls is the man's sister who is helping the girlfriend lie. Following are the statements from all four of them:

Ariana: "Myrna is his girlfriend."
Jane: "Angelina is lying."
Angelina: "Ariana is lying."
Myrna: "Jane is not his sister."

Can you find out who is the man's sister among them?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

Replace the question mark with the correct number below.