Free Grade 10 Reading Comprehension Passages & Answers

A fundamental principle of kinematics is that horizontal and vertical motions are completely independent of one another. Imagine a physics professor conducting an experiment in a vacuum chamber, free of air resistance. She holds two identical steel spheres. She drops the first sphere straight down, while simultaneously firing the second sphere perfectly horizontally from a spring-loaded launcher. Even though the second sphere travels a great distance horizontally before hitting the floor, both spheres will strike the ground at the exact same fraction of a second. This occurs because the only force acting vertically on both spheres is gravity, which accelerates them downward at the identical rate of 9.8 m/s², regardless of their horizontal velocity.

In economics, “Price Elasticity of Demand” measures how sensitive consumers are to a change in the price of a product. If a product is “elastic,” a small increase in price will cause a massive drop in consumer demand. This usually happens with luxury goods or items with many substitutes, like a specific brand of cereal. Conversely, if a product is “inelastic,” a change in price will have very little effect on the quantity demanded. Essential goods, such as life-saving medications or basic utilities like water, are highly inelastic. Even if the price of insulin doubles, diabetic patients will continue to purchase it because it is necessary for their survival, giving the supplier immense pricing power.

One of the most powerful features of Object-Oriented Programming (OOP) in languages like C++ is “inheritance.” Inheritance allows a programmer to create a new class (the derived class) that automatically takes on the attributes and behaviors of an existing class (the base class). Imagine programming a video game. You could write a base class called `Enemy` that contains basic attributes like `health` and `speed`. Instead of writing the exact same code from scratch for a new monster, you can create a derived class called `FlyingDragon` that *inherits* from `Enemy`. The `FlyingDragon` immediately possesses `health` and `speed`, but the programmer can also add unique behaviors to it, such as a `breatheFire()` function. This promotes code reusability and dramatically reduces debugging time.

For over a thousand years, the medical world blindly accepted the anatomical theories of the ancient Greek physician Galen, who wrongly believed that blood flowed between the ventricles of the heart through invisible pores in the septum. This unchallenged dogma was finally corrected in the 13th century by the brilliant Islamic polymath Ibn al-Nafis. Through rigorous observation and early empirical methods, Ibn al-Nafis proved that the septum between the right and left ventricles is solid. He accurately theorized that blood must exit the right ventricle, travel to the lungs to be mixed with air, and then return to the left side of the heart. His groundbreaking discovery of “pulmonary circulation” predated European claims to the same discovery by nearly three hundred years.

Zain stared intensely at Question 14 on his O-Level Mathematics D paper. It was a multi-stage probability question about drawing colored marbles from a bag. The catch? The prompt explicitly stated: “without replacement.” He knew this changed everything. He quickly sketched a probability tree diagram in the margin. For the first branch, the probability of drawing a red marble was 4/10. However, for the second branch, because the red marble was *not* put back, the total number of marbles dropped to 9, and the red marbles dropped to 3. He carefully labeled the second branch as 3/9. Multiplying along the branches, he arrived at the final probability of drawing two consecutive red marbles. He boxed his answer, confident in his rigorous, step-by-step logic.