General Knowledge

China has constructed the world's longest sea bridge, the Hong Kong-Zhuhai-Macau Bridge, which spans approximately 55 kilometers. This makes China the correct answer for the country that built the longest sea bridge.

World Homeopathy Day is observed every year on 8th April to honor Dr. Christian Friedrich Samuel Hahnemann, the founder of homeopathy, on his birth anniversary.

The abbreviation 'OPF' stands for 'Overseas Pakistanis Foundation,' which is a government organization working for the welfare of overseas Pakistanis. This matches option C exactly.

World Refugee Day is observed annually on June 20th to raise awareness about the situation of refugees worldwide, as designated by the United Nations.

The 1951 Asian Games, held in New Delhi, India, were officially known as the First Asian Games, marking the inaugural edition of this continental multi-sport event.

The study of sound is called acoustics, which deals with the production, transmission, and effects of sound waves. The other options relate to different fields: paleontology (study of fossils), mineralogy (study of minerals), and cartography (map making).

Khojak Pass is a mountain pass in Balochistan, Pakistan, connecting Qila Abdullah with Chaman. It is also known as Khojak Gap or simply Khojak Pass. The name 'Toba Chaman' is not an alternate name for Khojak Pass; rather, Toba Achakzai is the mountain range through which the Khojak Pass runs. Therefore, none of the options A, B, or C are correct alternate names for Khojak Pass.

STAR stands for Standard Terminal Arrival Route, which is a published flight procedure used by aircraft to transition from en-route flight to an approach phase at an airport.

Dapsang is another name for Rakaposhi, a prominent mountain in the Karakoram range of Pakistan. The other options are different mountains with distinct names.

World Sports Journalists Day is celebrated on July 1 every year to honor sports journalists worldwide. Therefore, option A is correct.