Number System and Codes MCQ
2.
Convert the following decimal number to 8-bit binary.187
A.
101110112
B.
110111012
C.
101111012
D.
101111002
Answer: Option A
3.
Convert binary 111111110010 to hexadecimal.
A.
EE216
B.
FF216
C.
2FE16
D.
FD216
Answer: Option B
4.
Convert the following binary number to decimal. 010112
A.
11
B.
35
C.
15
D.
10
Answer: Option A
5.
Convert the binary number 1001.00102 to decimal.
A.
90.125
B.
9.125
C.
125
D.
12.5
Answer: Option B
6
The voltages in digital electronics are continuously variable.
A.
True
B.
False
Answer: Option B
7.
One hex digit is sometimes referred to as a(n):
A.
byte
B.
nibble
C.
grouping
D.
instruction
Answer: Option B
8.
Which of the following is the most widely used alphanumeric code for computer input and output?
A.
Gray
B.
ASCII
C.
Parity
D.
EBCDIC
Answer: Option B
9.
If a typical PC uses a 20-bit address code, how much memory can the CPU address?
A.
20 MB
B.
10 MB
C.
1 MB
D.
580 MB
Answer: Option C
10.
Convert 59.7210 to BCD.
A.
111011
B.
01011001.01110010
C.
1110.11
D.
0101100101110010
Answer: Option B
11.
Convert 8B3F16 to binary.
A.
35647
B.
011010
C.
1011001111100011
D.
1000101100111111
Answer: Option D
12.
Which is typically the longest: bit, byte, nibble, word?
A.
Bit
B.
Byte
C.
Nibble
D.
Word
Answer: Option D
13.
Convert decimal 64 to binary.
A.
01010010
B.
01000000
C.
00110110
D.
01001000
Answer: Option B
14.
Convert hexadecimal value C1 to binary.
A.
11000001
B.
1000111
C.
111000100
D.
111000001
Answer: Option A
15.
Convert the following octal number to decimal. 178
A.
51
B.
82
C.
57
D.
15
Answer: Option D
16.
Convert the following binary number to octal.
0101111002
A.
1728
B.
2728
C.
1748
D.
2748
Answer: Option D
17.
The BCD number for decimal 347 is ________.
A.
1100 1011 1000
B.
0011 0100 0111
C.
0011 0100 0001
D.
1100 1011 0110
Answer: Option B
18.
How many binary digits are required to count to 10010?
A.
7
B.
2
C.
3
D.
100
Answer: Option A
19.
The binary number for octal 458 is ________.
A.
100010
B.
100101
C.
110101
D.
100100
Answer: Option B
20.
The sum of 11101 + 10111 equals ________.
A.
110011
B.
100001
C.
110100
D.
100100
Answer: Option C
21.
Convert the following binary number to decimal.
100110102
A.
154
B.
155
C.
153
D.
157
Answer: Option A
22.
The decimal number 188 is equal to the binary number ________.
A.
10111100
B.
0111000
C.
1100011
D.
1111000
Answer: Option A
23.
Convert the following binary number to octal.
0011010112
A.
1538
B.
3518
C.
2538
D.
3528
Answer: Option A
24.
How many bits are in an ASCII character?
A.
16
B.
8
C.
7
D.
4
Answer: Option C
25.
A binary number's value changes most drastically when the ________ is changed.
A.
MSB
B.
frequency
C.
LSB
D.
duty cycle
Answer: Option A
26.
Convert decimal 213 to binary.
A.
11001101
B.
11010101
C.
01111001
D.
11100011
Answer: Option B
29.
27.The sum of the two BCD numbers, 0011 + 0011, is ________.
A.
0110
B.
0111
C.
0011
D.
1100
Answer: Option A
28.Which is not a word size?
A.
64
B.
28
C.
16
D.
8
Answer: Option B
29.The octal numbering system:
A.
simplifies tasks
B.
groups binary numbers in groups of 4
C.
saves time
D.
simplifies tasks and saves time
Answer: Option D
30.When using even parity, where is the parity bit placed?
A.
Before the MSB
B.
After the LSB
C.
In the parity word
D.
After the odd parity bit
Answer: Option A
31.An analog signal has a range from 0 V to 5 V. What is the total number of analog possibilities within this range?
A.
5
B.
50
C.
250
D.
infinite
Answer: Option D
32.Hexadecimal letters A through F are used for decimal equivalent values from:
A.
1 through 6
B.
9 through 14
C.
10 through 15
D.
11 through 17
Answer: Option C
33.A decimal 11 in BCD is ________.
A.
00001011
B.
00001100
C.
00010001
D.
00010010
Answer: Option C
34.What is the resultant binary of the decimal problem 49 + 01 = ?
A.
01010101
B.
00110101
C.
00110010
D.
00110001
Answer: Option C
35.The difference of 111 – 001 equals ________.
A.
100
B.
111
C.
001
D.
110
Answer: Option D
36.Convert the binary number 1100 to Gray code.
A.
0011
B.
1010
C.
1100
D.
1001
Answer: Option B
37.The binary number 11101011000111010 can be written in hexadecimal as ________.
A.
DD63A16
B.
1D63A16
C.
1D33A16
D.
1D63116
Answer: Option B
38.Which of the following is an invalid BCD code?
A.
0011
B.
1101
C.
0101
D.
1001
Answer: Option B
39.What decimal number does 25 represent?
A.
10
B.
31
C.
25
D.
32
Answer: Option D
40.Convert the Gray code 1011 to binary.
A.
1011
B.
1010
C.
0100
D.
1101
Answer: Option D
41. Determine the decimal equivalent of the signed binary number 11110100 in 1's complement.
A.
116
B.
–12
C.
11
D.
128
Answer: Option C
42.What is the difference between binary coding and binary-coded decimal?
A.
BCD is pure binary.
B.
Binary coding has a decimal format.
C.
BCD has no decimal format.
D.
Binary coding is pure binary.
Answer: Option D
43.Digital electronics is based on the ________ numbering system.
A.
decimal
B.
octal
C.
binary
D.
hexadecimal
Answer: Option C
44.An informational signal that makes use of binary digits is considered to be:
A.
solid state
B.
digital
C.
analog
D.
non-oscillating
Answer: Option B
45.The 1's complement of 10011101 is ________.
A.
01100010
B.
10011110
C.
01100001
D.
01100011
Answer: Option A
46.Convert the decimal number 151.75 to binary.
A.
10000111.11
B.
11010011.01
C.
00111100.00
D.
10010111.11
Answer: Option D
47.
The binary-coded decimal (BCD) system can be used to represent each of the 10 decimal digits as a(n):
A.
4-bit binary code
B.
8-bit binary code
C.
16-bit binary code
D.
ASCII code
Answer: Option A
48.The 2's complement of 11100111 is ________.
A.
11100110
B.
00011001
C.
00011000
D.
00011010
Answer: Option B
49.Convert the following decimal number to BCD.469
A.
100101101000
B.
010001101001
C.
100001101001
D.
100101100100
Answer: Option B
50.
Express the decimal number –37 as an 8-bit number in sign-magnitude.
A.
10100101
B.
00100101
C.
11011000
D.
11010001
Answer: Option A
51.Convert the following BCD number to decimal.010101101001bcd
A.
539
B.
2551
C.
569
D.
1552
Answer: Option C
52.The base of the hexadecimal system is:
A.
eight.
B.
sixteen.
C.
ten.
D.
two.
Answer: Option B
53.Select one of the following statements that best describes the parity method of error detection.
A.
Parity checking is best suited for detecting single-bit errors in transmitted codes.
B.
Parity checking is not suitable for detecting single-bit errors in transmitted codes.
C.
Parity checking is capable of detecting and correcting errors in transmitted codes.
D.
Parity checking is best suited for detecting double-bit errors that occur during the transmission of codes from one location to another.
Answer: Option A
54.Which of the following is the primary advantage of using the BCD code instead of straight binary coding?
A.
Fewer bits are required to represent a decimal number with the BCD code.
B.
The relative ease of converting to and from decimal.
C.
BCD codes are easily converted to hexadecimal codes.
D.
BCD codes are easily converted to straight binary codes.
Answer: Option B
55.How many BCD code bits and how many straight binary bits would be required to represent the decimal number 643?
A.
12 BCD, 12 binary
B.
12 BCD, 10 binary
C.
12 BCD, 9 binary
D.
16 BCD, 9 binary
Answer: Option B
56..
When using the repeated division by 2 method of converting from decimal to binary, one must write the first remainder as the:
A.
MSB
B.
MSB, provided the following sequence of remainders are written in descending order until the final remainder is achieved.
C.
LSB
D.
LSB, provided the final remainder is used to replace the original LSB, which is then moved to the MSB position.
Answer: Option A
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