Free Grade 8 Reading Comprehension Passages & Answers

A common misconception about space travel is that rockets move forward by pushing their exhaust against the air behind them. If this were true, a rocket would be entirely useless in the vacuum of space, where there is no air to push against! In reality, rocket propulsion relies entirely on Newton’s Third Law of Motion, which states that for every action, there is an equal and opposite reaction. Inside the rocket’s engine, highly pressurized gas is ignited and expelled downward at incredible speeds. The “action” is the force of the rocket pushing the gas out of the nozzle. The “reaction” is the gas pushing back against the inside of the rocket engine with the exact same amount of force, propelling the massive vehicle upward into the sky.

Imagine you buy a non-refundable $15 ticket to a movie. After watching the first thirty minutes, you realize the movie is absolutely terrible. Do you stay and endure the next ninety minutes, or do you leave? In behavioral economics, staying simply because you already paid for the ticket is an example of the “sunk cost fallacy.” A sunk cost is money or time that has already been spent and cannot be recovered. Logical decision-making dictates that you should only consider future costs and benefits. Since the $15 is gone regardless of what you do, staying to watch a movie you hate only costs you an additional ninety minutes of your valuable time.

When learning a programming language like C++, students must quickly learn the difference between two types of bugs: syntax errors and semantic errors. A syntax error is like a grammatical mistake in English. If a programmer forgets a required semicolon at the end of a statement, the compiler will refuse to translate the code, and the program will not even run. A semantic error, however, is a flaw in the actual logic. The code is written perfectly according to the rules of C++, so the program runs without crashing. However, because the programmer accidentally used a plus sign instead of a minus sign in an equation, the program produces the completely wrong output. Semantic errors are notoriously much harder to debug.

During the 10th century, the city of Córdoba in Al-Andalus (modern-day Spain) was a shining center of science and learning. It was here that a brilliant physician named Al-Zahrawi wrote a monumental thirty-volume medical encyclopedia called the Al-Tasrif. The final volume of this massive work was dedicated entirely to surgery. Al-Zahrawi provided detailed illustrations and instructions for over two hundred surgical instruments, many of which he invented himself. Among his greatest contributions was the discovery of “catgut” for internal stitches. Because catgut is a natural material that dissolves safely inside the body over time, it revolutionized abdominal surgery and is a concept still utilized in modern operating rooms today.

Ayan sat at the kitchen table, drumming his pencil against his O-Level Mathematics D past paper. Question 7 featured a complex circle geometry diagram. There was a triangle drawn inside the circle, and he needed to find an unknown angle, x, located at the circumference. He knew this section of the syllabus didn’t involve complex algebraic formulas; it relied strictly on geometric logic. He traced the lines with his finger from the circumference back down to the center of the circle, where an angle of 110 degrees was clearly marked. Suddenly, the rule clicked in his mind: The angle at the center is exactly twice the angle at the circumference. He smiled, divided 110 by two, and confidently wrote down 55 degrees as his final answer.