Explanation

A circle is a basic geometric shape with no edges or corners.

Explanation

A square box that stands out in a design draws attention and becomes the focal point.

The focal point is the center of interest in a composition.

Explanation

A set square is used to construct right angles (perpendiculars) in geometry.

It typically has angles of 90°, 45°, and 60° for constructing perpendicular lines.

Explanation

0° – Zero angle (no turn)

Less than 90° – Acute angle

Exactly 90° – Right angle

Between 90° and 180° – Obtuse angle

Exactly 180° – Straight angle

Between 180° and 360° – Reflex angle

Exactly 360° – Full rotation / Complete angle

Explanation

The correct order of planets starting from the closest to the Sun is Mercury, Venus, Earth, and Mars.

Mercury is the closest, followed by Venus, Earth, and then Mars.

Explanation

An anion is a negatively charged ion.

H⁻ (hydride ion) carries a negative charge, so it is an anion.

Explanation

Sodium chloride (NaCl) dissolves in water because it is an ionic compound that dissociates into ions.

Water molecules surround and separate the sodium and chloride ions, allowing it to dissolve.

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Explanation

The spinal cord controls movement by transmitting signals between the brain and body; damage can cause paralysis.

The severity depends on the injury location, but mobility loss is a common result.

Explanation

Phytoplankton are microscopic plants that perform photosynthesis and form the base of the marine food chain.

They provide energy for small marine animals, which are then eaten by larger predators.