why number 8549176320 is one of a kind?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

What does below rebus means ?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

What two things can you never eat for breakfast?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What do you get if you add 2 to 100 four times?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)