Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Can you name some countries which do not have the alphabet 'A' in them?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

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?

Look at the picture and find out which square is not linked with any of the other squares.

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?