Science Class

The students in a class are making a scale model. They need a material that they can easily bend into a circle. Which of the following objects is best for the students to use?

• copper wire
• glass rod
• lead pipe
• wooden stick

Jamal wants to make an electrical circuit, but he only has wires and a bulb. Which of the following must Jamal also have to make an electrical circuit?

• a motor
• a switch 
• a bar magnet 
• a power source 

Which part of the radio is designed to transform electrical energy into sound energy?

• digital display
• plastic case
• speaker
• tuner

A mixture of sand, salt, and iron filings is stirred into a beaker of water. The mixture is then allowed to settle. What will separate the iron filings from the mixture?

• Magnetism
• Filtration
• Flotation
• Sifting

Which material should Ahmad use for cooking?

• Aluminum, because it is a good electrical conductor
• Copper, because it is a good thermal conductor
• Glass, because it is a good electrical insulator
• Plastic, because it is a good thermal insulator