Indiana Science Grade 7

Chapter 15: Electronics and Computers

Standardized Test Practice

1.
What term describes the silicon in the illustration?

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A)metalloid
B)actinide
C)lanthanide
D)nonmetal
2.
Why is arsenic added to the silicon?

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A)to decrease conductivity
B)to decrease density
C)to increase density
D)to increase conductivity
3.
Which of the following is the computer's short-term memory that stores programs and documents?
A)hard disk
B)microprocessor
C)RAM
D)ROM
4.
How is an analog signal different from a digital signal?
A)It uses electric current.
B)It is made by sampling.
C)It cannot be digitized.
D)It varies continuously.
5.
What binary number is represented by the switches in the illustration?

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A)0010
B)0011
C)0100
D)1010
6.
How many combinations of binary digits are possible using the set of digits?

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A)8
B)24
C)32
D)16
7.
Which of these is a type of magnetic storage?
A)CD
B)RAM
C)hard disk
D)ROM
8.
What process enables background noise to be removed from a digitized music file?
A)signal processing
B)digitizing
C)sampling
D)signal splicing
9.
Which is a component that can be used to ampify signals or to act as switches?
A)diode
B)transistor
C)microprocessor
D)semiconductor
10.
How many combinations does a binary number with 3 digits have?
A)6
B)8
C)24
D)27
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