The correct answer is 45m. In a standard 400m hurdles race, the first hurdle is placed 45 meters from the starting line. The race has a total of 10 hurdles, with the distance between each hurdle being 35 meters, and the final hurdle is placed 40 meters from the finish line.
Options 14.2m and 30m are distances used in other track events (like the 110m hurdles), and 50m is too far from the start.
The correct answer is Tajikistan. Tajikistan is a landlocked country in Central Asia, meaning it has no direct access to any ocean or sea. It is bordered by Afghanistan, China, Kyrgyzstan, and Uzbekistan. Nepal is also landlocked, but Tajikistan is the correct answer among the given options.
Sri Lanka is an island nation with many seaports, and Cuba also has extensive coastlines.
The correct answer is 1971. The first electronic mail message was sent in 1971 by American computer engineer Ray Tomlinson, who implemented a system to send messages between users on different computers across the ARPANET, the precursor to the modern Internet.
Therefore, the first email was sent in 1971.
The correct answer is Firmware. Firmware is a specific type of software programmed permanently into a hardware device's non‑volatile memory, such as ROM, EPROM, or flash memory. It provides the low‑level control instructions that allow the physical device to function and communicate with other systems.
Thus, the software that is permanently embedded into hardware is called firmware.
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The correct answer is 28. To find the unknown number, we translate the percentage statement into an algebraic equation and solve for the variable.
Hence, the number is 28.
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The correct answer is A ∩ B = φ. This notation states that the intersection of events A and B is the empty set, which perfectly describes mutual exclusivity.
Therefore, the correct relation for mutually exclusive events A and B is A ∩ B = φ.
The correct answer is 720. The factorial notation (!) means multiplying all positive integers from the number down to 1. The expression 10! / 7! can be simplified by expanding the factorials and cancelling common terms.
Thus, 10! / 7! equals 720.
The correct answer is 300. We are told that 45% of the participants are boys, and the number of boys is 135. Using this information, we can find the total number of students by setting up a simple percentage equation.
Hence, the total number of students participating is 300.
The correct answer is -1. This is a basic linear equation. We will isolate the variable x step by step using algebraic operations.
Therefore, the value of x is -1.
The correct answer is 25%. Percentage increase is calculated by finding the absolute increase (new value minus original value), dividing it by the original value, and then multiplying by 100.
Thus, the increasing percentage is 25%.
The correct answer is Embedded AI. Embedded AI refers to artificial intelligence that is integrated directly into a physical device or hardware system, enabling it to perform real‑time, context‑aware tasks without constant cloud connectivity.
Therefore, when AI is embedded physically for real‑time work, it is called Embedded AI.
The correct answer is 50p² + 72q². This algebraic simplification uses the identities for the square of a binomial: (a - b)² = a² - 2ab + b² and (a + b)² = a² + 2ab + b². When added, the middle terms cancel beautifully.
Thus, the simplified expression is 50p² + 72q².
The correct answer is Line Chart. A line chart is specifically designed to display data points connected by straight line segments, making it the most effective chart type for visualizing trends, patterns, and changes over a continuous time period.
Hence, the chart that shows time trend changes is the line chart.
The correct answer is Fixes bugs and security. A software patch is a set of changes designed to update, repair, or improve a computer program. Its primary and most critical function is to correct errors (bugs) and close security vulnerabilities that could be exploited by attackers.
Thus, the function of patch software is to fix bugs and security issues.
The correct answer is IPS. IPS (In‑Plane Switching) is a type of LED‑backlit LCD panel technology widely used in premium computer monitors, smartphones, and televisions because of its superior color reproduction and wide viewing angles.
Therefore, advanced monitors typically use IPS panels.
The correct answer is Address Resolution Protocol. ARP is a fundamental network communication protocol used to map an Internet Protocol (IP) address to a physical machine address, also known as a Media Access Control (MAC) address, on a local area network.
Hence, ARP stands for Address Resolution Protocol.
The correct answer is Converts into machine codes. A compiler is a specialized program that translates the entire source code of a high‑level programming language (like C, C++, or Java) into machine code, bytecode, or another lower‑level form that a computer's processor can directly execute.
Thus, a compiler's main function is to convert source code into machine codes.
The correct answer is MS Word. Microsoft Word is a word processing application used to create and edit text documents. It is not a programming language, which is a set of instructions and syntax used to develop software, scripts, or applications.
Therefore, MS Word is not a programming language.
The correct answer is Unlimited. Microsoft PowerPoint does not impose a hard, fixed limit on the total number of slides in a presentation file. The practical number is effectively unlimited, constrained only by the computer's available memory and storage.
Hence, you can insert an unlimited number of slides in PowerPoint.
The correct answer is Tin. The process of coating steel cans with a thin layer of tin is known as tinning, and it is fundamental to the manufacturing of "tin cans" used widely for preserving food and beverages.
Thus, tin is the element used for coating in can manufacturing.
The correct answer is 10%. Nuclear power currently supplies approximately 10% of the world's total electricity generation, which, when translated into global primary energy demand, represents roughly 4‑5%. However, the most commonly cited statistic in such contexts is that nuclear energy provides about 10% of the planet's electricity.
Therefore, nuclear energy accounts for about 10% of world electricity demand.
The correct answer is Primary water Treatment. Sedimentation is a fundamental physical process used in the first major stage of municipal wastewater treatment to remove large, settleable solids from raw sewage.
Hence, sedimentation is an integral part of primary water treatment.
The correct answer is Particulate Matter. While smog is a complex mixture of various air pollutants, the specific particle that is a defining component of smog—especially the classic "London‑type" and modern photochemical smog—is particulate matter (PM), a suspension of fine solid and liquid particles in the air.
Thus, the specific particle added in smog is particulate matter.
The correct answer is Coring. Coring is the culinary and food‑processing technique used specifically to remove the tough, inedible central part (core) from fruits like apples, pears, and pineapples, which houses the seeds and fibrous placenta.
Therefore, removing the inedible central part of seeds from a fruit is called coring.
The correct answer is Paleozoic. The Phanerozoic Eon is the current and most recent of the four geologic eons, spanning the last 541 million years. It is divided into three major eras: the Paleozoic, the Mesozoic, and the Cenozoic.
Thus, the Paleozoic is the era that belongs to the Phanerozoic Eon.