Test 9

Question 1

What early device was developed to store electric charge?

Answer 1

Leyden jar

Question 2

What is the general term for a device that transforms the energy of an electric current into another useful form of energy?

Answer 2

load

Question 3

What is the SI unit of resistance?

Answer 3

ohm

Question 4

What device consists of one or more electrochemical cells connected in series to produce a single source of current?

Answer 4

battery

Question 5

What device converts pulses of electricity into sound waves?

Answer 5

loudspeaker

Question 6

What communication device uses electromagnets to reproduce messages by means of audible clicks?

Answer 6

telegraph

Question 7

What is a material that allows current to flow through it with no resistance?

Answer 7

superconductor

Question 8

Who built the first electrostatic generator?

Answer 8

Otto von Guericke

Question 9

What is the transfer of an electric charge by direct contact between objects?

Answer 9

conduction

Question 10

What device converts absorbed sunlight directly into electricity?

Answer 10

photovoltaic cell

Question 11

What type of generator works by passing a conducting fluid through a magnetic field?

Answer 11

magnetohydrodynamic generator

Question 12

What is an electric field with even strength throughout?

Answer 12

uniform

Question 13

What is the method of magnetism in which an object is permanently magnetized by stroking a magnet against the object?

Answer 13

magnetizing by contact

Question 14

What is a semiconductor device that produces light when a direct current is applied?

Answer 14

light-emitting diode

Question 15

What is the line connecting all points where a compass needle points true north?

Answer 15

agonic

Question 16

What is the imaginary line that circles Earth halfway between the two magnetic poles?

Answer 16

magnetic equator

Question 17

What is the final attraction force between two charged objects when the distance is reduced to 1/5 of the original distance?

Answer 17

25 times the original force

Question 18

What is a small, relatively inexpensive computer designed for use by one user at a time?

Answer 18

personal computer

Question 19

What is a large, extremely powerful computer designed for rapidly performing complex calculations?

Answer 19

supercomputer

Question 20

What allows a computer to communicate with the outside world or a user to communicate with the computer?

Answer 20

input/output device

Question 21

What part of a computer controls all other systems of the computer?

Answer 21

central processing unit

Question 22

What is the largest computer network?

Answer 22

internet

Question 23

What is a single chip that contains a complete CPU?

Answer 23

microprocessor

Question 24

What is a collection of programs that contain instructions for displaying words and images on the screen for a user?

Answer 24

operating system

Question 25

What type of computer memory is used for temporary storage?

Answer 25

RAM

Question 26

What is the SI unit of electric charge?

Answer 26

coulomb

Question 27

What are the actual physical components of a computer called?

Answer 27

hardware

Question 28

What is the smallest directly accessible unit of data in a computer?

Answer 28

byte

Question 29

What are the imaginary lines that indicate the direction and strength of a magnetic field called?

Answer 29

lines of flux

Question 30

What is the electrostatic method of reproducing images on paper?

Answer 30

xerography

Question 31

What is an electrical switch operated by an electromagnet called?

Answer 31

relay

Question 32

What process produces an electric current in a vacuum using a heated cathode?

Answer 32

thermionic emission

Question 33

What are pieces of information stored in computers called?

Answer 33

data

Question 34

electronic device that processes information using electrical circuits

Answer 34

computer

Question 35

produces a single binary output based on one or more binary inputs

Answer 35

logic gate

Question 36

uses a narrow strip of metal in a protective, insulated case to limit current through a circuit

Answer 36

fuse

Question 37

electrical device designed to add resistance to a circuit

Answer 37

resistor

Question 38

uses electromagnetic induction to produce electricity

Answer 38

generator

Question 39

produces a strong magnetic field when electricity passes through it

Answer 39

electromagnet

Question 40

simple device that converts electricity to back-and-forth motion

Answer 40

solenoid

Question 41

semiconductor device that can perform the same functions a vacuum-tube triode, such as acting as a switch and amplifying weak signals

Answer 41

transistor

Question 42

increases or decreases the voltage of an alternating current using electromagnetic induction

Answer 42

transformer

Question 43

The stored information and set of instructions that direct a computer to perform certain tasks is the _______.

Answer 43

software

Question 44

The rate of charge flow is called _______.

Answer 44

current

Question 45

The branch of the study of electricity that deals with the behavior and motion of electrons in a vacuum or in semiconductors is ______.

Answer 45

electronics

Question 46

The process of replacing atoms of a semiconductor with atoms of another element is called ______.

Answer 46

doping

Question 47

What is a simple vacuum tube consisting of three electrodes?

Answer 47

triode

Question 48

What are large computers designed to store and retrieve vast amounts of information?

Answer 48

mainframes

Question 49

What type of data can have any possible value within a specified range?

Answer 49

analog

Question 50

The positive terminal of a voltaic or storage cell contacts the cell's ______.

Answer 50

cathode

Question 51

What number system is based on powers of sixteen?

Answer 51

hexadecimal

Question 52

What is a semiconductor that lacks electrons?

Answer 52

p-type

Question 53

What type of electrochemical cell is not designed to be recharged?

Answer 53

voltaic

Question 54

The most common type of transistor used today is the _______ transistor.

Answer 54

field-effect

Question 55

What was America's first mass-produced computer?

Answer 55

UNIVAC I

Question 56

Substances that can be easily magnetized are considered magnetically ______.

Answer 56

soft