Assignment: Multiple Choice Answer Questions

Assignment

Multiple Choice Answer Questions

1. You and a friend are spending the weekend making up missed lab experiments. You are on to second semester material and are studying the electrostatic interaction of two charges. You notice that two charges are exerting a certain force on one another. If the distance between two electric charges doubles, then the force they exert on each other changes by how much?

A) 4 times as largeB) 2 times as largeC) ½ as largeD) ¼ as large

2. You and a friend are spending a weekend at a carnival. You get bored and begin to make electrostatics measurements. It turns out that you have a charge of +3 Coulombs and your friend a charge of -5 Coulombs. What is the net electric charge?

A) +2 CoulombsB) -2 CoulombsC) +8 CoulombsD) -8 Coulombs

3. You stick two pieces of adhesive tape on a glass window and then pull them off suddenly. If you now hold the tape pieces near each other, they will be

A) repelled because they have like chargesB) repelled because they have opposite chargesC) attracted because they have like chargesD) attracted because they have opposite charges

4. After running a plastic comb through you hair several times you hold it above a small scrap of paper. The paper jumps off the table and sticks to the comb because the paper becomes

A) magneticB) electrically chargedC) conductingD) electrically polarized

5. A charged object is able to repel

A) only charged objectsB) neutral objects and neutral particlesC) neutral objects but not neutral particles D) only neutral particles

6. In the dark, the photoconductors used in most xerographic copiers are

A) insulatorsB) semi-conductorsC) conductorsD) super-conductors

7. The surface of a photoconductor has been coated with electric charge. This charge will remain in place until you expose the surface to

A) an electric fieldB) a magnetic fieldC) both an electric field and a magnetic fieldD) light

8. Semiconductors

A) do not obey Ohm's lawB) obey Ohm's lawC) do not use electrons to conduct electricity.D) need light to work

9. You are an engineer and are building metal objects for a science lab that are supposed to hold charge for a long time. The object should not be

A) insulated from everything elseB) smooth C) sharp and pointedD) circular

10. Suppose you have a semiconductor and are not able to bias it such that any electrons leave the valence band. This object really then is a (an)

A) conductorB) insulatorC) metalD) lightning rod

11. You decide to help your physics professor do an interactive classroom demonstration. You are standing on a plastic bench that insulates you from your surroundings. Both you and the helium balloon you are holding are electrically neutral. You now rub the balloon against your sweater, so that the balloon becomes negatively charged, and then let the balloon float away. You are left

A) with no negative electrically charged particles in your bodyB) with a negative electric chargeC) electrically neutralD) with a positive electric charge

12. Your cat has chewed the cord to your desk lamp and has created a short circuit ...