World General Knowledge Quiz

The Moon has about 1/80th of Earth's mass, which is why it has much weaker gravity (about 1/6th of Earth's surface gravity). This significant mass difference explains why the Moon orbits Earth rather than them orbiting a common center of mass. The fraction 1/4 would make the Moon far too massive.

Florence Nightingale gained fame for her pioneering nursing work during the Crimean War (1853-1856), where she improved sanitary conditions and dramatically reduced mortality rates. She became known as 'The Lady with the Lamp' for her night rounds caring for wounded soldiers. World Wars I and II occurred much later (1914-1918 and 1939-1945).

Sher Shah Suri introduced the silver rupee coin during his reign in the 16th century, establishing a standardized currency system. The rupee continued to be used through the Mughal period and evolved into modern India's currency. Shahjahan came later, while the East India Company adopted the existing system.

Israel's official currency is the New Shekel (ILS), introduced in 1986 replacing the old Shekel. The Lira was Israel's currency before 1980. Won (South Korea) and Yen (Japan) are currencies of other Asian nations.

Egypt's currency is the Egyptian Pound (EGP), one of the oldest currencies still in use. The Pound has been Egypt's official currency since 1834, though it has undergone several revaluations. Dollar, Yen, and Euro are currencies of other nations.

Barbuda (part of Antigua and Barbuda) uses the East Caribbean Dollar as its official currency. The EC Dollar is shared by eight Caribbean island nations and has been pegged to the US Dollar since 1976. Pound and Lev are European currencies, while Won is Korean.

Cuba has two official currencies: the Cuban Peso (CUP) used by citizens and the Cuban Convertible Peso (CUC) for tourism and international trade. The Peso has been Cuba's currency since 1857. Krone is Scandinavian, Birr is Ethiopian, and Dollar is American/international.

Bangladesh's official currency is the Taka (BDT). The other options are currencies of different countries: Lev (Bulgaria), Birr (Ethiopia), and Won (North and South Korea).

Iran's official currency is the Rial (IRR). Dinar is used in several Middle Eastern countries but not Iran, Lira is Turkey's currency, and Peso is used in Latin American countries.

Iceland's official currency is the Krona (ISK). The Irish Pound is from Ireland (now uses Euro), Rupiah is Indonesian, and Rial is used in Iran and other Middle Eastern countries.

Poland's official currency is the Zloty (PLN). Kina is Papua New Guinea's currency, Zaire was an old Belgian currency, and Bolivar is Venezuela's currency.

South Africa's official currency is the Rand (ZAR). Peseta was Spain's currency (now Euro), Naira is Nigeria's currency, and Colon is Costa Rica's currency.

Tooth decay (dental caries) is the most common non-contagious disease globally, affecting people of all ages. It is caused by bacteria in the mouth breaking down sugars from food.

To answer this question, the user needs to know about the properties of fog and its effect on light.

Option A is incorrect because total internal reflection occurs when light travels from a more dense to a less dense medium at an angle greater than the critical angle. Fog consists of water droplets that are less dense than air, so total internal reflection does not occur.

Option B is incorrect because the fine drops of water in fog do not polarize the light. Polarization occurs when light waves are restricted to a single plane of vibration, which does not occur in the presence of fog.

Option C is incorrect because opaque objects completely block light, whereas fog allows some light to pass through.

Option D is correct because the fine drops of water in fog scatter most of the light that passes through them. This scattering makes it difficult for light to travel in a straight path, resulting in reduced visibility.

Therefore, the correct answer is:

The Answer is: D

Alauddin Khalji introduced market control and price regulation systems, especially for essential commodities like grains. His administrative reforms included setting fixed prices and preventing hoarding through a robust market control mechanism.

Tree age is determined by counting annual growth rings in the trunk stem. Each ring represents one year of growth, visible as concentric circles when the tree trunk is cut horizontally.

Koneru Humpy achieved the title of Woman Grandmaster (WGM) in 2002, becoming the first Indian woman to earn this prestigious FIDE title. She was also the first Indian woman to become a men's International Master.

Venus transits occur in pairs separated by 8 years, with over a century between successive pairs. The 2004 transit was the first since 1882, making it a 122-year gap. The next pair will occur in 2117 and 2125.

Dr. M.S. Swaminathan, renowned agricultural scientist and father of India's Green Revolution, was appointed chairman of the National Commission on Farmers in 2004. The commission was formed to address the growing agrarian crisis and farmer suicides.