Crash Course Computer Science: ALU and Binary Addition

What is the primary function of the ALU in a computer?

• Controlling input and output devices

• Managing memory

• Performing arithmetic and logical operations

• Storing data

Which ALU was the first to fit entirely inside a single chip?

• Intel 4004

• AMD 2901

• Motorola 68000

• Intel 74181

What are the basic logic gates used to build an adding circuit?

• NOT, NAND, NOR, XNOR

• AND, OR, NAND, NOR

• NAND, NOR, XNOR, XOR

• AND, OR, NOT, XOR

What is the output of an XOR gate when both inputs are 1?

• 2

• Undefined

• 1

• 0

What additional component is needed to handle the carry bit in binary addition?

• NAND gate

• OR gate

• AND gate

• NOT gate

How many bits does a full adder take as input?

• 4

• 5

• 2

• 3

What is the term for when the result of an addition is too large to be represented by the number of bits used?

• Underflow

• Carry out

• Overflow

• Bit shift

What is a ripple carry adder?

• An adder where carry bits ripple forward to subsequent adders

• An adder that performs multiplication

• An adder that uses a single logic gate

• An adder that can only add two bits

What is the main advantage of using a carry-look-ahead adder over a ripple carry adder?

• It is faster

• It uses fewer logic gates

• It can perform multiplication

• It is simpler to design

Why do simple ALUs not have circuits for multiplication and division?

• They require too many logic gates

• They are not needed

• They are too slow

• They are too complex