science exam

Question 1

what is the transfer of electric charge between objects

Answer 1

conduction

Question 2

who built the 1st electrostatic generator

Answer 2

otto von Guericke

Question 3

the SI unit of resistance

Answer 3

ohm

Question 4

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

Answer 4

super conductor

Question 5

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

Answer 5

telegraph

Question 6

What device converts pulses of electricity into sound waves?

Answer 6

loudspeaker

Question 7

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

Answer 7

battery

Question 8

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

Answer 8

load

Question 9

What early device was developed to store electric charge?

Answer 9

laden jar

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 field

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 13

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

Answer 13

light-emitting diode (LED)

Question 14

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

Answer 14

agonic line

Question 15

the imaginary line that circles Earth halfway between the two magnetic poles

Answer 15

magnetic equator

Question 16

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

Answer 16

25 times the original force

Question 17

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

Answer 17

personal computer

Question 18

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

Answer 18

supercomputer

Question 19

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

Answer 19

input/output device

Question 20

the largest computer network

Answer 20

internet

Question 21

a single chip that contains a complete CPU

Answer 21

micro processor

Question 22

What type of computer memory is used for temporary storage?

Answer 22

RAM

Question 23

the SI unit of electric charge

Answer 23

coulomb

Question 24

the actual physical components of a computer

Answer 24

hardware

Question 25

the smallest directly accessible unit of date in a computer

Answer 25

byte

Question 26

an electronic device that processes information using electrical circuits

Answer 26

computer

Question 27

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

Answer 27

logic gates

Question 28

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

Answer 28

fuse

Question 29

electrical device designed to add resistance to a circuit

Answer 29

resistor

Question 30

uses electromagnetic induction to produce electricity

Answer 30

generator

Question 31

produces a strong magnetic field when electricity passes through it

Answer 31

electromagnetic

Question 32

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

Answer 32

solenoid

Question 33

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

Answer 33

transistor

Question 34

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

Answer 34

transformer

Question 35

pieces of information stored in computers

Answer 35

data

Question 36

an electrical switch operated by an electromagnet

Answer 36

relay

Question 37

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

Answer 37

thermionic emission

Question 38

the imaginary lines that indicate the direction and strength of a magnetic field

Answer 38

lines of flux

Question 39

the electrostatic method of reproducing images on paper

Answer 39

xerography

Question 40

the stored information and set of instructions that direct a computer to perform certain tasks

Answer 40

software

Question 41

a simple vacuum tube consisting of three electrodes

Answer 41

triode

Question 42

the process of replacing atoms of a semiconductor with atoms of another element

Answer 42

doping

Question 43

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

Answer 43

electronics

Question 44

the rate of charge flow

Answer 44

current

Question 45

the type of data than can have any possible value within a specified range, is digital data

Answer 45

false, analog data

Question 46

the number system that is based on powers of sixteen is this number system, is binary system

Answer 46

false, hexadecimal

Question 47

a semiconductor that lacks electrons is a n-type semiconductor

Answer 47

false, p-type

Question 48

America's first mass-produced computer, is ENICA

Answer 48

false, UNVIA 1

Question 49

substances that can be easily magnetized, is hard

Answer 49

false, soft

Question 50

the most common type of transistor used today, is field effect

Answer 50

true

Question 51

the type of electrochemical cell that is not designed to be recharged, is voltaic cell

Answer 51

true

Question 52

the positive terminal of a voltaic or storage cell contacts the cell's, cathode

Answer 52

true, cathode

Question 53

large computers designed to store and retrieve vast amounts of information

Answer 53

true, mainframes

Question 54

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

Answer 54

solenoid