The Ultimate General Knowledge Quiz

The correct answer is "human immunodeficiency virus." HIV stands for Human Immunodeficiency Virus, which is a virus that attacks the immune system, specifically the CD4 cells (T cells), and weakens the body's ability to fight off infections and diseases. It is the virus that causes AIDS (Acquired Immunodeficiency Syndrome).

Triskaidekaphobia is the fear of the number 13. This phobia is often associated with superstitions and is considered unlucky in many cultures. The prefix "triskaideka" means thirteen in Greek, and "phobia" refers to an irrational fear. Therefore, triskaidekaphobia specifically refers to the fear of the number 13.

The correct answer is 3.141592654. This number is the closest approximation to the mathematical constant pi, which is approximately equal to 3.14159. The given number has eleven digits, just like the question asks for, and it matches the known digits of pi up to the seventh decimal place. Therefore, it is the correct answer.

Homeostasis refers to the maintenance of a constant internal environment within an organism. This includes the regulation of various physiological processes such as body temperature, pH levels, blood sugar levels, and water balance. The body continuously works to maintain these internal conditions within a narrow range, despite changes in the external environment. This balance is crucial for the proper functioning of cells, tissues, and organs, allowing them to carry out their functions optimally.

The correct answer is antananarivo. Antananarivo is the capital of Madagascar. It is the largest city in the country and is located in the central highlands. The city is known for its rich history, cultural heritage, and unique architecture.