Explanation

• The electricity used in homes and schools is typically Alternating Current (AC).
• It is the type of electric current that periodically changes direction.
• This is the type of current provided by power plants and distributed through the grid.

Explanation

• Car brakes are typically hydraulic systems, not pneumatic systems.

The examples of pneumatic systems:

• Spray gun: uses compressed air to atomize and spray paint or other materials.
• Bicycle pump: uses compressed air to inflate tires.
• Vacuum cleaner: uses compressed air to create suction and lift dust and debris.

Explanation

• The Earth is part of the Milky Way Galaxy.
• It is a barred spiral galaxy containing hundreds of billions of stars, gas, and dust.

Explanation

• Sugar and water is a classic example of a solution, where sugar (the solute) is dissolved in water (the solvent).
• The resulting mixture is a homogeneous solution, where the sugar molecules are evenly distributed throughout the water.

Explanation

• The solute is the component of a solution that is dissolved in the solvent.
• It can be a solid, liquid, or gas, and it is typically present in a smaller amount than the solvent.
• Examples: sugar, salt, and coffee.

Explanation

• Crystallization is the process of separating a soluble solid from a solution by allowing the solution to cool and form crystals.
• This process is used to purify substances and obtain a solid in a pure form.

Explanation

• When the Moon and the Sun are on opposite sides of the Earth, we see a Full Moon.
• This occurs when the entire face of the Moon is illuminated by the Sun, making it visible all night long.

Explanation

• In a solid, the particles are closely packed and have a fixed position.
• But they still have some freedom to vibrate or oscillate in place, due to their thermal energy.

Explanation

• When a magnet is suspended freely, its north pole will point towards the Earth's magnetic South pole (which is located near the Earth's geographic North pole), and its south pole will point towards the Earth's magnetic North pole (which is located near the Earth's geographic South pole).
• This is because opposite poles attract, and the Earth's magnetic field is strong enough to align the magnet's poles.

Explanation

A screw is a simple machine that is an inclined plane wrapped around a cylinder. 

It is used to fasten objects together, and it is used in:

• Fastening parts together
• Holding things in place
• Providing a secure grip

Examples include:

• Wood screws (used in woodworking and construction)
• Machine screws (used in machinery and equipment)
• Self-tapping screws (used in plastic and metal)
• Bolts (used in heavy-duty applications)
• Lag screws (used in heavy construction)
• Deck screws (used in decking and outdoor construction)
• Drywall screws (used in drywall installation)
• Anchor screws (used in concrete and masonry)