Indiana Science Grade 7

Chapter 15: Electronics and Computers

Electronics and Computers

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