# Number Systems and Codes

MCQsQuestion.com has 151 Question/Answers about Topic Number Systems and Codes

## Resistors—usually 300 apiece—inserted between a decoder and a 7-segment display are ________.

- A. pull-up resistors to keep logic HIGH when the input is open
- B. sense resistors to enable a test of logic levels
- C. current limiting resistors for the 7-segment display
- D. surge resistors to prevent damage from power-line variations
- Correct Answer: Option C

## An unweighted code in which only one bit changes from one code number to the next is ________.

- A. BCD
- B. Excess-3
- C. Gray
- D. ASCII
- Correct Answer: Option C

## The decimal equivalent of the BCD number 1010 is ________.

- A. 8
- B. 10
- C. 12
- D. invalid
- Correct Answer: Option D

## The column weight of the “1” in the hexadecimal number 1AB is ________.

- A. 64
- B. 256
- C. 512
- D. 1024
- Correct Answer: Option B

## Overflow can occur if two signed numbers are added and ________.

- A. they have opposite signs
- B. they have the same sign
- C. both of the above
- D. none of the above
- Correct Answer: Option B

## The decimal number –128 is represented in the signed 2’s complement system as ________.

- A. 1111 1110
- B. 0111 1111
- C. 1000 0000
- D. 1111 1111
- Correct Answer: Option C

## The 2’s complement of the binary number 1000 is ________.

- A. 111
- B. 0110
- C. 1110
- D. 1000
- Correct Answer: Option D

## The decimal fraction 1/4 can be written in binary as________.

- A. 0.010
- B. 0.100
- C. 0.110
- D. 0.011
- Correct Answer: Option A

## The largest BCD number that can be represented with four binary bits is ________.

- A. 9
- B. 10
- C. 15
- D. 16
- Correct Answer: Option A

## The largest unsigned decimal number that can be represented in binary using six bits is ________.

- A. 63
- B. 64
- C. 127
- D. 128
- Correct Answer: Option A

## A typical CD-ROM can store ________ of digital data.

- A. 90 minutes
- B. analog portions
- C. 650 megabytes
- D. octal bytes
- Correct Answer: Option C

## Whenever information is transmitted from one device to another, there is a possibility that ________.

- A. one device is off
- B. errors will occur
- C. there is a full moon
- D. the data will be received as transmitted
- Correct Answer: Option B

## A complete alphanumeric code would include 26 lowercase letters, 26 uppercase letters, 10 numeric digits, 7 punctuation marks, and anywhere from ________ to ________ other characters.

- A. 5, 10
- B. 10, 15
- C. 10, 20
- D. 20, 40
- Correct Answer: Option D

## Most computers store data in strings of ________ bits called a ________.

- A. 8, word
- B. 8, byte
- C. 16, word
- D. 16, byte
- Correct Answer: Option B

## Odd-parity 9E16 is ________ decimal.

- A. 30
- B. 158
- C. 78
- D. Nothing. Parity does not check.
- Correct Answer: Option A