Explanation

• The velocity of a wave (v) is equal to the product of its wavelength (λ) and frequency (f).
• This is expressed mathematically as: v = λf

Explanation

• When fuel is burned, carbon dioxide gas (CO₂) is primarily produced.
• The combustion of fuel, particularly hydrocarbons, typically results in the formation of carbon dioxide and water vapor (H₂O).

Explanation

• A concentrated solution has a high amount of solute relative to the solvent.
• Indicating that there is a large quantity of the dissolved substance compared to the amount of solvent.

Explanation

• The solvent is the substance that dissolves the solute, typically present in a larger amount than the solute.
• It can be a solid, liquid, or gas, and its molecules or atoms separate the solute molecules or atoms, allowing them to dissolve.
• Examples: water, alcohol, and acetone.

Explanation

• Carbon Dioxide (CO2) is a greenhouse gas that traps heat in the Earth's atmosphere.
• It contributing to the greenhouse effect and global warming.

Explanation

• Wood is an insulator and cannot conduct electricity.
• So it cannot be used to complete a circuit.

Explanation

• A closed circuit provides a complete path for the current to flow through.
• It allowing electricity to flow from the power source, through the wire, and back to the power source.

Explanation

An inclined plane is a slanting surface connecting a lower level to a higher level.

It is a simple machine that helps to lift or move loads to a higher position, and is commonly used in:

• Ramps
• Staircases
• Slides
• Ski lifts
• Hilly roads

Explanation

• A pulley is a simple machine that uses grooved wheels and a rope to raise, lower, or move a load.
• It changes the direction of the force, making it easier to lift or move heavy loads.
• Examples: Raising a load and A flag pulley.

Explanation

Marasmus is a form of severe protein-energy malnutrition, characterized by a lack of sufficient protein and calories in the diet.

It is most commonly seen in children under the age of 5, particularly in developing countries where access to nutritious food is limited.

Marasmus is caused by a severe deficiency of protein and calories, leading to:

• Wasting of muscles and tissues
• Weight loss
• Fatigue
• Weakness
• Poor growth and development