English
History
Biology
Maths
Physics
100

This definite article is used before a noun to indicate that the noun refers to something specific and known to the listener.

What is "the"?

100

The first industry transformed by the Industrial Revolution.

What is the textile industry?

100

This sense allows you to feel textures and temperatures, and it involves receptors in your skin.

What is touch?

100

This term refers to the measure of space occupied by a three-dimensional object, like a box or a can of soda.  

What is volume?

100

This celestial body is closest to Earth and provides light and warmth.

What is the Sun?

200

This word is used to introduce additional information about a place.

What is "where"?

200

This energy source powered steam engines.

What is coal?

200

This sense relies on chemoreceptors in your nose.

What is smell?

200

What geometric property determines the volume of a prism or cylinder?

What is the area of the base multiplied by the height?

200

This force keeps planets in orbit around the Sun and moons around planets.

What is gravity?

300

This term refers to a natural combination of words that are frequently used together, such as "make a decision" or "take a break."

What is a collocation?

300

The creation of different social classes during the Industrial Revolution.

What is the new class system?

300

This part of the eye controls the amount of light that enters by changing size in response to light intensity.

What is the pupil?

300

These types of equations commonly form a U-shaped graph.

What are quadratic equations?

300

This planet is known for its beautiful rings made up of ice and rock particles.

What is Saturn?

400

This word is used to introduce a clause providing essential information about a noun.

What is "which" (when used restrictively without commas)?

400

This movement advocated for individual freedoms and democracy.

What is liberalism?

400

These specialized cells in the nervous system transmit impulses to and from the brain.

What are neurons?

400

To find the solutions to a quadratic equation, one method involves setting the equation equal to zero and finding these points where it crosses the x-axis.

What are roots or zeros?

400

These objects have such strong gravity that not even light can escape from them.

What are black holes?

500

This rule determines when to use the definite article "the" before the names of geographical features, such as rivers and mountain ranges.

What is when the feature is unique or considered a collective entity (e.g., the Amazon, the Alps).

500

The growth of cities during the Industrial Revolution often led to this environmental consequence.

What is pollution?

500

Prolonged exposure to sounds above this decibel level can cause permanent hearing damage.

What is 85 decibels?

500

Beyond math class, these equations are used in real-life scenarios such as determining the trajectory of objects in flight or optimizing shapes in architecture.

What are applications in physics, engineering, or economics?

500

This theory proposes that the universe began as an incredibly dense and hot state approximately 13.8 billion years ago.

What is the Big Bang theory?