Why did the Girl throw the butter out of the window?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

What goes up but never comes down?

I cannot talk, but I always reply when spoken to. What am I?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Why Aeroplane windows are round?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

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

Which is faster, Heat or Cold ? Explain.