Grade 5 - Reviewer about Properties of Matter and Circuits

Why is copper used for electrical wires?

• It is cheap and easy to bend.

• It is a good conductor of electricity.

• It is a strong material that can resist heat.

• It is transparent and light.

Why are cooking pots often made of stainless steel?

• It is a poor conductor of heat.

• It is lightweight and flexible.

• It resists rust and can withstand high temperatures.

•  It is a good electrical conductor.

Why is rubber used as insulation around electrical wires?

• It is a good conductor of electricity.

• It prevents electricity from escaping and causing harm.

• It is durable and heat-resistant.

• It is flexible and strong.

Why are non-stick coatings often used on frying pans?

• To make them heavier.

• To reduce the amount of heat they can absorb.

• To make it easier to clean and prevent food from sticking.

• To improve the taste of food.

Why is glass used for windows and bottles?

• It is a poor conductor of heat.

• It is transparent and durable.

• It is very flexible.

• It is a good electrical conductor.

Why is it important to choose a strong material for a bridge?

• To make the bridge look attractive.

• To ensure it can support heavy loads and prevent collapse.

• To make the bridge lighter.

• To reduce the cost of building the bridge.

Why should a helmet be made of hard, impact-resistant material?

• To keep it lightweight and easy to wear.

• To protect the head from injury during impact.

• To make it fashionable.

• To allow air to pass through for ventilation.

Why is wood used for furniture but not for cooking utensils?

• Wood is a good conductor of heat.

• Wood is not durable enough for cooking utensils.

• Wood can easily absorb food odors and heat, which is not safe for cooking.

• Wood is waterproof and ideal for cooking.

Why are fire-resistant materials important in the construction of buildings?

• To make the building more attractive.

• To prevent fires from spreading quickly and protect people inside.

• To reduce the cost of construction.

• To make the building lighter and easier to move

Why should a car's tires be made of rubber instead of plastic?

• Rubber is better for insulation.

• Rubber provides better grip and absorbs shocks.

• Plastic tires would make the car faster.

• Plastic is cheaper than rubber.