North Carolina Science Grade 7

Chapter 15: Electronics and Computers

Electronics and Computers

1.
A changing electric current that carries information is a(n) __________.
A)alternating current
B)direct current
C)magnetic tape
D)electronic signal
2.
Which of the following is NOT a solid-state component?
A)transistor
B)diode
C)vacuum tube
D)integrated circuit
3.
Early televisions and radios were larger than their modern versions because they used __________.
A)transistors
B)semiconductors
C)vacuum tubes
D)silicon
4.
Which of the following base two numbers is equal to the base ten number 13?
A)1110
B)310
C)1101
D)221
5.
If the base ten number 15 is written 1111 in the binary system, how would it be written in base 5?
A)10
B)30
C)111
D)11
6.
An analog signal is created by __________.
A)a computer
B)digitization
C)an analog device
D)a binary number series
7.
A(n) __________ is a device that contains three layers of semiconductors and can be used as an electronic switch.
A)diode
B)binary
C)analog
D)transistor
8.
Which of the following statements about computer information storage is correct?
A)Information on a hard disk is stored magnetically.
B)Information on a hard disk is stored with electronic switches.
C)Information stored in ROM is lost when the computer is turned off.
D)Information stored on a hard disk can only be read and not changed.
9.
An electric current is a flow of __________ from one place to another.
A)atoms
B)electrons
C)protons
D)neutrons
10.
A number that is expressed using only the digits 0 and 1 is called __________.
A)a prime number
B)a binary number
C)binumeric
D)a base ten number
11.
Information stored in computers must be converted to a(n) __________.
A)hardware component
B)program
C)analog signal
D)digital signal
12.
The electrical conductivity of semiconductor elements can be changed by adding __________.
A)analogs
B)diodes
C)digital signals
D)impurities
13.
A(n) __________ is a series of instructions that tell the computer how to do a job.
A)hard disk
B)CPU
C)integrated circuit
D)program
14.
A computer's temporary memory is called __________.
A)C++
B)ROM
C)a hard disk
D)RAM
15.
Which of the following is an analog device?
A)computer
B)CD player
C)television
D)digital watch
16.
Which of the following is NOT computer hardware?
A)keyboard
B)word processing program
C)microprocessor
D)hard disk drive
17.
A(n) __________ is a semiconductor device that allows current to flow in only one direction.
A)transistor
B)chip
C)integrated circuit
D)diode
18.
Which of the following elements is a semiconductor?
A)strontium
B)silicon
C)sodium
D)selenium
19.
What is the base ten equivalent of the binary number 1100100?
A)13
B)1,200
C)128
D)100
20.
Which of the following is NOT a computer language?
A)Basic
B)Java
C)C++
D)Compiler
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