Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

Can you find the mistake in the below statement?

What has many teeth, but cannot bite?

John was drowned by he was not wet. How?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
In House H1, The boy plays for Mexico Youth academy and the other child plays baseball.
In House H2, The boy Plays soccer for his school in Mexico and they recently have a newborn.

Can you prove that the probability of House-H1 having a girl child is more than that of House-H2?

I got a bee but no honey.
got an eye but am still blind.
got a sea but no water.
got a tea but no coffee.
got a why but no answer.

What Am I?