General Knowledge

Igor Sikorsky began experimenting with helicopter designs as early as 1909 and 1910, but these early models were not practical or capable of free flight. The first practical and successful helicopter developed by Sikorsky was the Vought-Sikorsky VS-300, which had its first tethered flight on September 14, 1939, and its first free flight in 1940. This design led to the Sikorsky R-4, the world's first mass-produced helicopter, introduced in 1942. Therefore, the correct answer is 1939 (option B), the year when the first practical helicopter was developed and flown.

The Danyang-Kunshan Grand Bridge in China is the longest bridge in the world, stretching over 164 kilometers as part of the Beijing–Shanghai High-Speed Railway. This makes option B the correct answer.

Lahore is famously known as the 'City of Mosques' due to its numerous historic and architecturally significant mosques, such as the Badshahi Mosque and Wazir Khan Mosque. This nickname is not commonly associated with Peshawar, Dhaka, or Delhi.

The highest sand dunes in the world are not in the Sahara, Thar, or Gobi deserts, but the tallest sand dune is Duna Federico Kirbus in Argentina, which rises about 1,230 meters above its base. The Sahara desert has large dunes but they are not the highest. The Thar desert and Gobi desert also do not have the highest dunes. Among the options given, the Sahara desert (option A) is the most well-known for large sand dunes, but the highest dunes globally are in places like Argentina (not listed) and the Namib Desert in Africa. Since the question asks for the highest sand dunes and the Sahara is the only correct desert among the options with significant dunes, option A is the best answer. The original option C 'Thank desert' is a misspelling and does not exist as a desert name.

Pristina is the capital city of Kosovo, making option B the correct answer. The other options are countries with different capitals.

Habib Bourguiba declared Tunisia's independence from France in 1956, marking the end of French colonial rule and the establishment of Tunisia as a sovereign nation.

The modern examination system is most commonly attributed to Henry Fischel, an American businessman and philanthropist in the late 19th century. He standardized written exams as a systematic method to assess student knowledge and reasoning, earning him recognition as the "father of the modern exam." However, the concept of examinations dates back much earlier, notably to the Imperial Examination system established in Ancient China during the Sui Dynasty in 605 AD, which was the first formal merit-based exam system. The other options (Pythagoras, Sergey Brin, Wilhelm Wundt) are unrelated to the founding of the modern examination system.

The number of commissioners appointed by the U.S. Congress to select the site for the capital was three. These commissioners were responsible for surveying and choosing the location along the Potomac River, which became Washington, D.C.

Mario Puzo is the author of the novel "The Godfather," which is a famous crime novel published in 1969. The other options are not associated with this work.

The official currency of Lebanon is the Lebanese Pound, also known as the Lira. This makes option A the correct answer.