Science 10

In this visible spectrum, which color has the longest wavelength?

• blue

• green

• red

• violet

Which of the following best describes electromagnetism?

• A magnet that is produced by electric current

• A coil wire that uses current to produce a magnetic field

• A phenomenon in which a current-carrying wire produces a magnetic field

• A phenomenon in which electricity is produced by changing the magnetic field

The black metallic ore that has the property of attracting pieces of iron are called

• Magnesium

• Magnetite

• Lodestone

• Loadstone

Substances that are slightly attracted by strong magnets are said to be

• diamagnetic

• paramagnetic

• ferromagnetic

• none of these

A device that turns electric energy into sound energy is

• a speaker

• a VCD player

• a generator

• a transformer

If a magnet is brought near a magnet suspended on a string, the

• N poles attract each other

• N poles attract the S poles

• S poles attract each other

• N poles attract each other

A magnetic field can make a compass needle turn because the field

• attracts N pole

• is produced by a magnet

• comes from the center of the earth

• exerts forces on the atomic currents in the compass needle

The scientist who discovered that an electric current can affect the action of a magnetic needle was

• Andre Marie Ampere

• Hans Christian Oersted

• Michael Faraday

• William Gilbert

A certain radio station broadcasts at a frequency of 675KHz. What is the wavelength of the radio waves?

• 280 m

• 324 m

• 400 m

• 444 m

What type of electromagnetic waves is used in cell phones?

• infrared waves

• microwaves

• radio waves

• ultraviolet rays