Science Unit 3 Review

Which of the following is a ferromagnetic material?

• Aluminum

• Copper

• Diamond

• Iron

What is the name of the instrument that measures, detects, and determines the direction of a small electric current?

• Amplifier

• Inductor

• Galvanometer

• Solenoid

When particles from the sun travel towards the earth, the earth's magnetic field pulls them towards the poles. These solar particles interact with particles in Earth's atmosphere and can create a beautiful light display in the sky. What is the light display called?

• Aurora

• Geographic Pole

• Radiation Belt

• Solar Flare

Which of the following best describes alternating current?

• Current that constantly turns on and off

• Current in which charges change direction

• Current that gains and loses electrons

• Current that increases and decreases in temperature

Which best describes electromagnetism?

• The electrical component of a magnet

• The flow of electricity between two magents

• The interaction between electricity and magnetism

• The flow of a magnetic field between two electrons

Tags

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Huckleberry learns that all magnets have two magnetic poles. Which of the following observations would best support this statement?

• When a bar magnet is cut in half, each half has a north pole and south pole

• The north pole of a compass needle is attracted to the south pole of a bar magnet

• When an electric current flows through a wire, a magnetic field forms around the wire

• The strength of a horseshoe magnet's magnetic field decreases as the magnet is pulled away from another object

Computers use binary digits to transmit information. What is this binary digit called?

• Binary Code

• Bit

• Microprocessor

• Signal

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Which of the following correctly explains why people should not use frayed electrical cords?

• Frayed electrical cords expose users to electric circuits, creating the risk of electric shock.

• Frayed electrical cords are good conductors of electricity, increasing the likelihood of a uncontrolled surge of electricity

• Frayed electrical cords use electricity very inefficiently, increasing the demand on power plants and wasting energy resources

• Frayed electrical cords are series circuits, which means if one part of the circuit breaks, no current can flow through the circuit

Huckleberry wants to make his school a safer place to be during a lightning storm. What can he do?

• Remove circuit breakers from the school

• Dig a small pond in the back of the school

• Help mount a lightning rod on top of the school

• Design a plan to increase the height of the school

Tags

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Which of these is NOT an electrical insulator?

• Copper Wire

• Cotton Gloves

• Plastic

• Rubber Tubing