Which country has the oldest written constitution still in force?

The Constitution of the United Kingdom is known as:

Which country adopted its constitution in 1950?

The Constitution of Japan came into force in:

Which constitution is considered the lengthiest written constitution in the world?

The Constitution of France (Fifth Republic) was adopted in:

Which country follows a Federal system under its constitution?

The Constitution of China was adopted in:

Which country’s constitution begins with the phrase “We the People”?

The Constitution of South Africa came into effect in: