NST 121 Midterm Practice

What type of memory can be accessed faster than RAM?

• Main Memory

• Cache

• Hard Disk

• SSD (Solid State Drive)

How many nanoseconds are in one second?

• one hundred thousand

• one thousand

• one billion

• one million

Assuming an 8-bit word computer, convert the decimal number 43 to binary.

(a)  

Answer explanation

This law states: "The cost of capital equipment to build semiconductors will double every 4 years"

• Rock's Law

• Moore's Law

• The Law of Equivalence of Hardware and Software

• The Law of Semiconductors

These are the universal logic gates. (Choose 2)

• AND

• NOR

• NOT

• NAND

• XOR

Answer explanation

Any Boolean function can be constructed using only these 2 gates. Plus, they are inexpensive to build!

Which logic gate has a truth table that looks like this?

• NOT

• NAND

• OR

• AND

• XOR

What is DeMorgan's law?

• (x + y)' = x'y'

• x + 1 = 1

• x * x = x

• (x + y) + z =

  x + (y + z)

What is the name of the 7-bit character encoding system that also makes up part of Unicode?

(a)  

Which option lists the basic Boolean operations in order of priority (highest to lowest)?

• 1. NOT

  2. OR

  3. AND

• 1. OR

  2. AND

  3. NOT

• 1. NOT

  2. AND

  3. OR

• 1. AND

  2. NOT

  3. OR

How do you find the two's complement of the signed magnitude number 01101001?

• Flip the bits and add 2

• Flip the bits

• Flip the bits and add 1

• Nothing. The two's complement is the same as the binary number.

Answer explanation

In signed magnitude, the most significant bit indicates the sign of the number. If the MSB is 0, the number is positive, and if it is 1, the number is negative. The one's and two's complements of positive numbers are the same as the original number.