What brings you down but never up?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

How many runs at maximum can a batsman score in a normal one-day match? Consider the fact that the conditions are ideal and there are no No Balls, no Wide Balls and no Extras in that match.

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What does the below rebus riddle means?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

A Car is crossing a bridge 2 miles long. The bridge can only hold 10000 lbs, which is the exact weight of the car. The Car makes it half way across the bridge and stops. A bird lands on the car. Does the bridge collapse? Explain.

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???