239 + Mcqs in Number Systems And Codes Page 2 McqOptions

51.	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
Answer» D. ASCII

Discussion

52.	Hexadecimal 44 is ________ in binary.
A.	1000100
B.	10011010
C.	1011000
D.	10001100
Answer» B. 10011010

Discussion

53.	Octal-to-binary conversion is accomplished by simply replacing each octal digit with its 4-bit binary equivalent.
A.	1
B.
Answer» C.

Discussion

54.	The ________ number system has a base of sixteen.
A.	Johnson
B.	hexadecimal
C.	binary
D.	octal
Answer» C. binary

Discussion

55.	A debugging utility is used to take the "bugs" out of a program.
A.	1
B.
Answer» B.

Discussion

56.	A string of 64 bits has 9 bytes.
A.	1
B.
Answer» C.

Discussion

57.	________ symbols are needed to represent all digits in hexadecimal.
A.	Six
B.	Ten
C.	Twelve
D.	Sixteen
Answer» E.

Discussion

58.	Adding a zero to the leftmost bit of an ASCII code is called ________.
A.	extra zero
B.	zero padding
Answer» C.

Discussion

59.	The Gray code has a base of eight.
A.	1
B.
Answer» C.

Discussion

60.	The hexadecimal equivalent of a decimal number would produce a larger number than the original decimal number.
A.	1
B.
Answer» C.

Discussion

61.	ASCII stands for American Standard Code for Information Interchange.
A.	1
B.
Answer» B.

Discussion

62.	The decimal number system consists of the digits 0‚Äì10.
A.	1
B.
Answer» C.

Discussion

63.	Hexadecimal 44 is ________ in decimal.
A.	6810
B.	7410
C.	7710
D.	9810
Answer» B. 7410

Discussion

64.	The 2's complement of the binary number 1000 is ________.
A.	111
B.	110
C.	1110
D.	1000
Answer» E.

Discussion

65.	In the decimal number 481, the powers-of-10 weight of the digit 4 is ________.
A.	400
B.	102
C.	104
D.	100
Answer» C. 104

Discussion

66.	The 1's complement of a binary number is derived by changing 0s to 1s and 1s to 0s.
A.	1
B.
Answer» B.

Discussion

67.	Each position in a decimal multidigit number will have a weighting factor based on a power of only 10.
A.	1
B.
Answer» B.

Discussion

68.	Decimal 2875 is ________ bytes in binary.
A.	2
B.	3
C.	4
D.	5
Answer» B. 3

Discussion

69.	The decimal equivalent of the BCD number 1010 is ________.
A.	8
B.	10
C.	12
D.	invalid
Answer» E.

Discussion

70.	Hexadecimal 12 is ________in binary.
A.	10111
B.	10100
C.	10010
D.	100001
Answer» D. 100001

Discussion

71.	A parity bit is used to detect an error in data transmission caused by noise.
A.	1
B.
Answer» B.

Discussion

72.	The ASCII code is a special code that represents all alphanumeric data.
A.	1
B.
Answer» B.

Discussion

73.	A byte has 8 bits.
A.	1
B.
Answer» B.

Discussion

74.	Repeated division-by-10 is used to convert decimal numbers to binary numbers.
A.	1
B.
Answer» C.

Discussion

75.	Odd-parity 9E16 is ________ decimal.
A.	30
B.	158
C.	78
D.	Nothing. Parity does not check.
Answer» B. 158

Discussion

76.	Binary 0010111101111110 is ________ in hexadecimal.
A.	77F216
B.	4EEE16
C.	2F7E16
D.	2F7716
Answer» D. 2F7716

Discussion

77.	In even parity, the sum of the individual bits in the code group must be even.
A.	1
B.
Answer» C.

Discussion

78.	The BCD equivalent of 73 is 01001001.
A.	1
B.
Answer» C.

Discussion

79.	Resistors‚Äîusually 300 apiece‚Äîinserted 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
Answer» D. surge resistors to prevent damage from power-line variations

Discussion

80.	When converting from decimal to binary by the repeated division-by-two method, the initial remainder becomes the MSD.
A.	1
B.
Answer» C.

Discussion

81.	The primary advantage of the hexadecimal numbering system is the ease in conversion between the binary and hexadecimal systems.
A.	1
B.
Answer» C.

Discussion

82.	Decimal 12 is ________ in hexadecimal.
A.	1216
B.	C16
C.	A216
D.	A16
Answer» C. A216

Discussion

83.	The decimal fraction 1/4 can be written in binary as________.
A.	0.01
B.	0.1
C.	0.11
D.	0.011
Answer» B. 0.1

Discussion

84.	A good example of the use of a digital representation of an analog quantity is the audio recording of music.
A.	1
B.
Answer» C.

Discussion

85.	Decimal 474 is ________ in BCD.
A.	0100 0111 0100
B.	0100 1011 0101
C.	0100 1001 0011
D.	0110 1011 1001
Answer» B. 0100 1011 0101

Discussion

86.	The column weight of the "1" in the hexadecimal number 1AB is ________.
A.	64
B.	256
C.	512
D.	1024
Answer» C. 512

Discussion

87.	The hexadecimal number system consists of 16 digits, 0‚Äì15.
A.	1
B.
Answer» C.

Discussion

88.	The word size is defined as the number of bits in the binary word that a digital system operates on.
A.	1
B.
Answer» B.

Discussion

89.	Manufacturers of computers utilize 3-bit codes to indicate operations or instructions.
A.	1
B.
Answer» C.

Discussion

90.	1210 = 11012 = C16 = 00010010 BCD
A.	1
B.
Answer» C.

Discussion

91.	A binary number with four digits has a maximum value of 15.
A.	1
B.
Answer» B.

Discussion

92.	In binary, the decimal number 93 converts to ________ digits.
A.	seven
B.	eight
C.	11
D.	five
Answer» B. eight

Discussion

93.	A computer will use ASCII code to store information internally.
A.	1
B.
Answer» C.

Discussion

94.	The hexadecimal numbering system uses base 15.
A.	1
B.
Answer» C.

Discussion

95.	Many digital electronic systems work in hexadecimal instead of binary.
A.	1
B.
Answer» C.

Discussion

96.	The largest BCD number that can be represented with four binary bits is ________.
A.	9
B.	10
C.	15
D.	16
Answer» B. 10

Discussion

97.	A binary number can be converted to a decimal number by summing the decimal values of the weights of all the 1s in the binary number.
A.	1
B.
Answer» B.

Discussion

98.	Digital systems operate only on discrete digits that represent numbers, letters, or symbols.
A.	1
B.
Answer» B.

Discussion

99.	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
Answer» C. both of the above

Discussion

100.	A positive binary number is represented by a 1 sign bit.
A.	1
B.
Answer» C.

Discussion

Explore topic-wise MCQs in Digital Electronics.

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

Hexadecimal 44 is ________ in binary.

Octal-to-binary conversion is accomplished by simply replacing each octal digit with its 4-bit binary equivalent.

The ________ number system has a base of sixteen.

A debugging utility is used to take the "bugs" out of a program.

A string of 64 bits has 9 bytes.

________ symbols are needed to represent all digits in hexadecimal.

Adding a zero to the leftmost bit of an ASCII code is called ________.

The Gray code has a base of eight.

The hexadecimal equivalent of a decimal number would produce a larger number than the original decimal number.

ASCII stands for American Standard Code for Information Interchange.

The decimal number system consists of the digits 0‚Äì10.

Hexadecimal 44 is ________ in decimal.

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

In the decimal number 481, the powers-of-10 weight of the digit 4 is ________.

The 1's complement of a binary number is derived by changing 0s to 1s and 1s to 0s.

Each position in a decimal multidigit number will have a weighting factor based on a power of only 10.

Decimal 2875 is ________ bytes in binary.

The decimal equivalent of the BCD number 1010 is ________.

Hexadecimal 12 is ________in binary.

A parity bit is used to detect an error in data transmission caused by noise.

The ASCII code is a special code that represents all alphanumeric data.

A byte has 8 bits.

Repeated division-by-10 is used to convert decimal numbers to binary numbers.

Odd-parity 9E16 is ________ decimal.

Binary 0010111101111110 is ________ in hexadecimal.

In even parity, the sum of the individual bits in the code group must be even.

The BCD equivalent of 73 is 01001001.

Resistors‚Äîusually 300 apiece‚Äîinserted between a decoder and a 7-segment display are ________.

When converting from decimal to binary by the repeated division-by-two method, the initial remainder becomes the MSD.

The primary advantage of the hexadecimal numbering system is the ease in conversion between the binary and hexadecimal systems.

Decimal 12 is ________ in hexadecimal.

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

A good example of the use of a digital representation of an analog quantity is the audio recording of music.

Decimal 474 is ________ in BCD.

The column weight of the "1" in the hexadecimal number 1AB is ________.

The hexadecimal number system consists of 16 digits, 0‚Äì15.

The word size is defined as the number of bits in the binary word that a digital system operates on.

Manufacturers of computers utilize 3-bit codes to indicate operations or instructions.

1210 = 11012 = C16 = 00010010 BCD

A binary number with four digits has a maximum value of 15.

In binary, the decimal number 93 converts to ________ digits.

A computer will use ASCII code to store information internally.

The hexadecimal numbering system uses base 15.

Many digital electronic systems work in hexadecimal instead of binary.

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

A binary number can be converted to a decimal number by summing the decimal values of the weights of all the 1s in the binary number.

Digital systems operate only on discrete digits that represent numbers, letters, or symbols.

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

A positive binary number is represented by a 1 sign bit.