Chapter 4- Quiz A

Question 1

Magnetic flux is:

a.) curved lines of force in space
b.) magnetic material
c.) the magnetization of other materials
d.) groups of smaller magnets

Answer 1

a.) curved lines of force in space

Question 2

An adjustable form of a resistor is the:

a.) capacitor
b.) switch
c.) rheostat
d.) diode

Answer 2

c.) rheostat

Question 3

When a switch is closed, electric current _________ when a switch is opened, electric current _________.

a.) stops, turns to AC
b.) stops, flows
c.) becomes AC, becomes DC
d.) flows, stops

Answer 3

d.) flows, stops

Question 4

A transformer is constructed with 100 turns on the primary side and 10 turns on the secondary side. What type of transformer is this?

a.) step down transformer
b.) step up transformer

Answer 4

a.) step down transformer

Question 5

The removal of electrons from an object by rubbing it with another is electrification by:

a.) friction
b.) grounding
c.) induction
d.) contact

Answer 5

a.) friction

Question 6

If two magnets are brought together, north to north poles will _________ whereas north to south poles will __________

a.) attract, repel
b.) attract, attract
c.) repel, repel
d.) repel, attract

Answer 6

d.) repel, attract

Question 7

Electrostatics is also known as electricity

a.) true
b.) false

Answer 7

b.) false

Question 8

There are _________ pounds in 1 kg.

a.) 2.5
b.) 2.2
c.) 3.2
d.) 1.2

Answer 8

b.) 2.2

Question 9

The purpose of grounding is to:

a.) ensure constant voltage
b.) provide a source for electricity
c.) neutralize a charged object
d.) replace the circuit breaker

Answer 9

c.) neutralize a charged object

Question 10

A transformer with a greater number of wire turns on the primary side compared to the secondary side would be considered an:

a.) step down transformer
b.) autotransformer
c.) step up transformer

Answer 10

a.) step down transformer

Question 11

The experimental link connecting electric and magnetic forces was discovered by:

a.) faraday
b.) oersted
c.) lenz
d.) volta

Answer 11

b.) oersted

Question 12

1 kilohertz is equal to

Answer 12

1000 hertz

Question 13

The ability to do work because of a seperation of charges is:

a.) electrostatics
b.) electric potential
c.) resistance
d.) electric current

Answer 13

b.) electric potential

Question 14

The shift of electrons from one object to another without being in contact with each other is electrification by:

a.) grounding
b.) contact
c.) induction
d.) friction

Answer 14

c.) induction

Question 15

Which of the following would likely be classified as a ferromagnetic material?

a.) iron
b.) air
c.) lead
d.) water

Answer 15

a.) iron

Question 16

A diode allows electrons to flow in only one direction.

a.) true
b.) false

Answer 16

a.) true

Question 17

Which of the following conditions or envirometns will provide the least resistance?

a.) a large cross sectional area
b.) long conductor
c.) high temp conductor
d.) glass material

Answer 17

a.) a large crosss sectional area

Question 18

The resistance of electric flow through a circuit is measured in:

a.) joules
b.) volts
c.) amperes
d.) ohms

Answer 18

d.) ohms

Question 19

Circuit overloads occuring in sensitive components of an electrical circuit can be prevented by the use of which of the following devices?

a.) thermionic diodes
b.) fuses
c.) circuit breakers

Answer 19

B and C

Question 20

A material that ahs a large number of free electrons is a :

a.) good insulator
b.) good conductor
c.) poor conductor
d.) none of the above

Answer 20

b.) good conductor

Question 21

Which of the following is a method of electrification?

a.) difraction
b.) resonance
c.) induction
d.) excitation

Answer 21

c.) induction

Question 22

Nearly all discussion of electricity deals with the movement of:

a.) negative charge
b.) poitive charge
c.) neutral charge
d.) all of the above

Answer 22

a.) negative charge

Question 23

Device that increases or decreases voltage through EM induction

Answer 23

transformer

Question 24

Device that converts electrical energy to mechanical energy through EM induction

Answer 24

electrical motor

Question 25

a device that converts mechanical energy to electrical energy

Answer 25

generator

Question 26

a wire that melts if it recieves too much current

Answer 26

fuse

Question 27

device that inhibits the flow of electrons

Answer 27

resistor

Question 28

a one way valve that allows electrons to flow in only one direction

Answer 28

diode

Question 29

stores and electrical charge temporarily but cannot produce new electrons

Answer 29

capacitor

Question 30

produces electrons through a chemical reaction, stores electrical charge long term, and provides an electrical potential

Answer 30

battery