Explanation

Inertia is the property of an object to resist any change in its state of rest or uniform motion.

It is described in Newton’s First Law of Motion, also called the Law of Inertia.

Explanation

The bubble in a spirit level is formed by leaving an air gap inside a sealed liquid vial.

This air gap naturally moves to the highest point, helping indicate level alignment.

Explanation

A solar eclipse occurs when the Moon comes between the Earth and the Sun.

Most commonly, we observe a partial eclipse, where only part of the Sun is obscured by the Moon.

Explanation

Light signals, such as semaphore flags or lantern flashes, were commonly used by sailors to communicate over distances.

These signals conveyed messages visually before the invention of modern communication tools.

Explanation

An inclined plane with one end higher is called a ramp, which is a type of simple machine.

It helps reduce the effort needed to lift objects by allowing them to be pushed or rolled upward.

Explanation

Transverse waves in earthquakes are called S-waves (Secondary waves) because they move the ground perpendicular to the wave direction.

P-waves are longitudinal waves, while S-waves are slower and arrive after them.

Explanation

Pitch determines whether a sound is shrill (high-pitched) or grave (low-pitched).

It depends on the frequency of the sound waves — higher frequency means higher pitch.

Explanation

Explanation

Explanation

Lunar Seas, or maria, are large, dark basaltic plains on the Moon's surface.

It formed by ancient volcanic eruptions.

They are not actual seas filled with water.