1. The electromagnetic spectrum is a continuous range of waves extending from: a
ID: 1768672 • Letter: 1
Question
1. The electromagnetic spectrum is a continuous range of waves extending from:
a) infrared waves to radio waves
b) gamma rays to x-rays
c) UV rays to radio waves
d) microwave to x-rays
e) none of the above
2. The smallest band of EM waves lies with the:
a) gamma rays b) x rays c) UV rays d) visible light e) microwaves
3. The EM wave of lowest frequency is the:
a) microwave b) radio waves c) UV d) X-rays e} gamma rays
4. The EM wave:
a) requires a specific medium in which to travel.
b) does not require a specific medium for travel
c) neither a or b
5. Which EM wave may cause skin cancer?
a) x- rays b) microwaves c) infrared wave d) UV ray e) all of the above
6. The electric company charges a home on the basis of consumption of
a) power b) energy c) voltage d) resistance e) current
7. Coulomb's Law deals with
a) waves b) charges c) heat d) light
8. Insulators allow the electrons
a) to move freely b) to move only to the left c) to move only to the right d) do not move right or left
True or False
9. Magnetic poles are exactly due north
10. Alternating current is produced by a battery
11. Direct current comes from the power from direct currents.
12. Our homes rely on power from direct currents
Explanation / Answer
1. e ==> its gamma rays to radio waves
2. d=> visible light ~ 300 nm.
3. e ==> gamma rays
4. b
5.d
6. b
7.b
8. d
9. FALSE --Magnetic north, which is the place where compass needles actually point, is near but not exactly in the same place as the geographic North Pole. Right now, magnetic north is close to Canada's Ellesmere Island.
10. FALSE -- dc - batteries produce current by a chemical reaction where electrons move from on part of a battery or cell to another. Always in the same direction.
ac is produced by a dynamo or generator. The electrons go back and forward.
11. FASLE -- The first commercial electric power transmission (developed by Thomas Edison in the late nineteenth century) used direct current. Because of the significant advantages of alternating current over direct current in transforming and transmission, electric power distribution is nearly all alternating current today.
12. FALSE: -- AC definitely. Strangely most of the appliances used today are rectified to DC, like your PC, phone charger, TV in fact just about everything without a motor uses DC. We are supplied with AC, because it is transformable therefore it can be supplied over distance. You can't transform DC so Eddison lost because of that, but he was right, really, DC is much safer and easier to use.
But yes, your house is supplied with AC.
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