General Knowledge

A double landlocked country is one that is landlocked and surrounded only by other landlocked countries. Uzbekistan and Liechtenstein are the only two such countries in the world, making option A correct.

Alexander the Great's famous horse was named Bucephalus. This is a well-known historical fact, and none of the other options correspond to his horse's name.

Ahmed Shehzad was the first Pakistani cricketer to score a century in T20 Internationals, achieving this milestone against Bangladesh in 2014. None of the other listed players reached a T20I hundred before him.

Charles Prior Hall, a California furniture designer and design student at San Francisco State University, invented the modern waterbed in 1968. Initially, he aimed to create an innovative chair but shifted focus to a bed using a vinyl bladder filled with water. He patented the waterbed in 1971 (U.S. Patent 3,585,356) and founded Innerspace Environments to manufacture and sell it. The waterbed uses water as a support medium, distinguishing it from traditional beds, and became popular in the 1970s and 1980s. This invention is well-documented and credited to Charles Prior Hall, confirming that option C, Waterbed, is correct.

Diego Garcia is a United States military base located in the Indian Ocean, specifically on an atoll in the Chagos Archipelago. This location is strategic for military operations in the region.

Maize, rice, and wheat are all types of cereal crops, which are grasses cultivated for their edible grains. They are not root crops or legumes, making 'Cereal Crops' the correct category.

Cuba is historically known as the 'sugar bowl of the world' due to its large-scale production and export of sugar. This nickname reflects its significant role in the global sugar industry.

A standard modern piano typically has 88 keys, which includes 52 white keys and 36 black keys. This is the widely accepted standard for an ordinary piano.

The first modern Olympic Games held in Athens in 1896 had 280 male athletes from 12 countries participating. Although some sources mention 13 or 14 nations, the officially recognized number of participating countries is 12. Therefore, the correct answer is 12, but since 12 is option A and the original correct answer was A, the question options need correction to reflect the accurate number. The closest correct number is 12, which corresponds to option C after correction.

Project Skybender is a Facebook initiative aimed at boosting 5G internet speeds using high-altitude drones. Therefore, the correct answer is Facebook, not Google.