Which of these is NOT a capital city?

Abuja

Cairo

Kinshasa

Johannesburg

Answer: Johannesburg

Explanation: Abuja is the capital of Nigeria, Kinshasa the capital of DRC (Democratic Republic of the Congo), Cairo is the capital of Egypt. Johannesburg is South Africa's biggest city but not capital, South Africa is one of the only countries in the world, that has more than 1 capital, South Africa's capitals are Cape Town, Pretoria, & Bloemfontein.