Current Affairs MCQs – Page 98 (Q971-980)

February has 29 days during a leap year, one additional day beyond its usual 28, added specifically to help synchronize the calendar with the Earth's actual orbital period around the Sun, which is slightly longer than 365 standard calendar days. This extra day, known as leap day, occurs on February 29 once every four years under the modern Gregorian calendar system. 28, 30 and 31 are tempting distractors, with 28 actually corresponding instead to February's usual day count during a common, non-leap year. People born specifically on February 29 are sometimes informally called leaplings, and they technically only have a true birthday once every four years.

One dozen consists of 12 individual items, a traditional counting unit with ancient origins, believed to have gained popularity partly because the number 12 can be evenly divided by many smaller whole numbers, including 2, 3, 4 and 6, making it especially practical for everyday commerce and trade. Eggs and baked goods, such as donuts, are commonly still sold by the dozen today. 16, 14 and 10 are simple numerical distractors that do not match the actual, correct number of items in a dozen. A related but far less common unit, the baker's dozen, traditionally refers to a quantity of 13 items.

One century consists of 100 years, a standard unit commonly used to measure and discuss longer spans of historical time, dividing recorded human history into more easily comprehensible, sequentially numbered blocks. Centuries are conventionally numbered based on the years they contain, such that the 21st century runs from the year 2001 through 2100. 1,000, 10 and 50 are simple numerical distractors that do not match the actual, correct number of years in a century. A related but much larger unit, the millennium, refers instead to a span of 1,000 years.

One decade consists of 10 years, a commonly used unit for discussing shorter, more recent spans of time, often referenced informally by decade nicknames such as the 1980s or the 1990s, capturing shared cultural, musical or political trends of a particular ten-year span. Ten decades together make up a full century, following the same consistent base-ten pattern used throughout most calendar and historical time units. 5, 100 and 20 are simple numerical distractors that do not match the actual, correct number of years in a decade. Journalists and historians frequently use decades as a convenient organizing framework for describing broader social, economic and technological trends over time.

A complete circle contains 360 degrees, a division system with ancient origins believed to trace back to the Babylonians, whose base-60 sexagesimal numbering system made 360, a number divisible by many smaller whole numbers, a particularly practical choice for dividing a circle into convenient angular units. This same ancient numbering tradition also explains why there are 60 minutes in an hour and 60 seconds in a minute. 400, 180 and 270 are tempting distractors, with 180 actually corresponding instead to the number of degrees in a straight line or half a circle. The 360-degree system remains the standard method used worldwide today for measuring angles in mathematics, navigation and engineering.

A right angle contains exactly 90 degrees, representing precisely one-quarter of a complete 360-degree circle, and is formed whenever two lines or surfaces meet at a perfectly perpendicular angle to one another. Right angles are fundamental throughout geometry, architecture and everyday construction, forming the basis of squares, rectangles and countless structural designs. 120, 180 and 45 are tempting distractors, with 180 actually corresponding instead to a straight angle and 45 corresponding to exactly half of a right angle. The small square symbol commonly used in geometric diagrams to denote a right angle is a widely recognized mathematical convention.

One gross, a traditional counting unit, consists of 144 items, equivalent to a dozen dozens, historically used in commerce and manufacturing for counting and packaging larger quantities of small goods more conveniently. The unit remains occasionally used today in certain wholesale and industrial contexts, particularly for items like pencils, screws or other small hardware components. 150, 120 and 100 are simple numerical distractors that do not match the actual, correct number of items in a gross. A related, much larger traditional unit, the great gross, refers to 1,728 items, equivalent to a dozen gross.

A nautical speed unit called a knot is equal to one nautical mile per hour, a measurement traditionally used in maritime and aviation navigation rather than the standard miles or kilometres per hour used for typical land-based travel speeds. A nautical mile itself is slightly longer than a standard land mile, based on the Earth's spherical geometry rather than an arbitrary fixed land distance. Second, minute and day are tempting distractors, as each is a different unit of time that does not correctly complete the knot's actual defining ratio. The term knot reportedly originated from an old nautical practice of measuring ship speed using a rope with evenly spaced knots paid out over a set period of time.

Seven continents are generally recognized in most geography classifications: Africa, Antarctica, Asia, Australia, Europe, North America and South America, though some educational systems and countries occasionally use slightly different models, such as combining Europe and Asia into a single Eurasian landmass. This seven-continent model remains the most widely taught framework in schools across much of the English-speaking world, including Pakistan. 5, 6 and 8 are tempting distractors, with 6 corresponding to alternative models that either combine or separate certain continents differently. Asia is by far the largest continent both by land area and by population, while Australia is the smallest inhabited continent.

Five major oceans are recognized in most modern geography classifications, including the Southern Ocean: the Pacific, Atlantic, Indian, Arctic and Southern Oceans, with the Southern Ocean surrounding Antarctica having gained more widespread formal recognition as a distinct ocean in relatively recent decades. Previously, many classifications recognized only four major oceans, treating the waters around Antarctica as simply southern extensions of the Pacific, Atlantic and Indian Oceans. 3, 6 and 4 are tempting distractors, with 4 corresponding to the older, more traditional classification that excluded the separately recognized Southern Ocean. The Pacific Ocean remains by far the largest and deepest of all the world's oceans.