Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Why is a river so rich ?

How is the moon similar to a dollar?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Can you count the number of quadrilaterals in the picture below?

You can hear me, but you can't touch or see me.

What am I?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?