61. The notion of a stored-program computer is important because

a. it allows programs to run faster
b. it saves disk space by storing programs in memory
c. it saves us from rewiring the computer to perform different tasks
d. it allows programs to execute in parallel




















62. Which of the following is NOT part of a transistor?

a. collector
b. control wire
c. emitter
d. base




















63. Which of the following is NOT an efficiency achieved by integrated circuits?

a. circuits no longer had to be wired together manually
b. different types of circuits could be combined on one circuit board
c. circuits could be made smaller
d. circuits could be duplicated




















64. The difference between a normally-open switch and a normally-closed switch is that

a. current can flow through the former, but not the latter
b. the former has a control wire; the latter doesn't
c. the former allows current to pass when its control is on; the latter allows current to pass when its control is off
d. the former represents high voltage by 1; the latter represents high voltage by 0.




















65. How many rows are needed in a truth table for 4 variables?

a. 4
b. 8
c. 16
d. 32




















66. A half-adder circuit is so-named because

a. it can only add numbers with values less than 1
b. it can only add two numbers at once
c. it has a provision for a carry input, but not one for a carry output
d. it has a provision for indicating a carry output, but not one for a carry input




















67. Most modern computers represent numbers

a. in binary, serial form
b. in decimal, serial form
c. in binary, parallel form
d. in decimal, parallel form




















68. Multiplexors are used in computers to

a. allow a variety of arithmetic and logical operations
b. allow all possible operations to be performed at once
c. select the desired output for a given operation
d. process many languages on a single computer




















69. How many select lines would be required to build an arithmetic-logic unit with 16 operations?

a. 2
b. 3
c. 4
d. 8




















70. A latch is

a. a circuit for storing a single bit
b. a circuit for storing the result of one arithmetic operation
c. a circuit for connecting a computer's ALU with its memory
d. a circuit for controlling normally-open and normally-closed switches




















 
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