Explanation

A spectrum is a band of seven colors that appear when white light is passed through a prism or a similar device, separating the different wavelengths of light.

The seven colors of the spectrum, in order, are:

1. Red
2. Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet

Explanation

Binoculars use a combination of lenses and prisms to magnify and redirect light, relying on total internal reflection to ensure minimal light loss and a bright, clear image.

Explanation

• Burning of wood is a chemical change, as it involves a chemical reaction between the wood and oxygen.
• Resulting in a change in chemical composition and the formation of new substances (ashes, carbon dioxide, water vapor, etc).

Explanation

• Hydrocarbon compounds are typically derived from fossil fuels and consist of hydrogen and carbon atoms.
• Examples include fuels like gasoline, natural gas, and propane, as well as waxes like candle wax and paraffin wax.

Explanation

• Melting of ice is a physical change, as it only involves a change in state (from solid to liquid) without a change in chemical composition.

The examples of chemical changes:

• Burning of fuel
• Explosion of firework
• Burning of wood
• Cooking of food (breakfast, lunch, dinner)
• Bursting of crackers
• Burning of wax
• Rusting of iron
• Heating sulphur with iron fillings (to produce iron sulphide)
• Digestion of food
• Respiration in living things
• Photosynthesis in plants

Explanation

• Navigation satellites, such as GPS (Global Positioning System), GLONASS, and Galileo.
• They are used to provide location information and precision timing signals to GPS receivers on the ground.
• It allowing for precise navigation and tracking of vehicles, ships, and aircraft.

Explanation

• Carbon dioxide (gas) dissolves in water (liquid).
• It forming a gas-liquid solution.

Explanation

• Axe, Knife, and Push pin are all examples of wedges, as they are used to split, separate, or lift things.
• Ramp is an inclined plane used to lift or move heavy objects, but it is not a wedge.

Explanation

• In a liquid, the particles are close together, but not fixed in place.
• It allowing them to move past each other and take the shape of their container.

Explanation

• A liquid is a state of matter that has a fixed volume but not a fixed shape.
• It takes the shape of its container and maintains its volume unless an external force is applied to change it.
• Solid: A solid has both a fixed shape and a fixed volume.
• Gas: A gas has neither a fixed shape nor a fixed volume. It expands to fill its container.