Your profile pic

computer MCQs

9th • Chapter 02

50 Questions TextBook
1

Which number system has a base of 10 and uses digits from 0 to 9?

A
Binary
B
Octal
C
Decimal
D
Hexadecimal
2

Why do computers primarily use the binary number system?

A
It is easy for humans to read
B
It fits well with the two-state (ON/OFF) nature of digital circuits
C
It can represent fractions easily
D
It uses fewer digits than decimal
3

What is the decimal equivalent of the binary number 1011?

A
10
B
11
C
12
D
13
4

How many binary digits (bits) does one octal digit represent?

A
2
B
3
C
4
D
8
5

Which number system uses digits 0-7?

A
Binary
B
Decimal
C
Octal
D
Hexadecimal
6

What is the base of the hexadecimal number system?

A
2
B
8
C
10
D
16
7

In hexadecimal, what decimal value does the letter 'F' represent?

A
10
B
12
C
14
D
15
8

To convert a decimal number to binary, you repeatedly divide the decimal number by what?

A
16
B
10
C
8
D
2
9

How many binary bits are equivalent to a single hexadecimal digit?

A
2
B
3
C
4
D
16
10

The binary number 1101011010110010 is equivalent to which hexadecimal number?

A
D6B2
B
C5A1
C
E7C3
D
F1B9
11

What does 'Z' represent in the context of data representation?

A
Whole Numbers
B
Real Numbers
C
Integers
D
Zero
12

Which set of numbers includes zero and all positive integers?

A
Integers (Z)
B
Real Numbers (R)
C
Whole Numbers (W)
D
Negative Numbers
13

What is the maximum value for a 1-byte (8-bit) unsigned whole number?

A
127
B
128
C
255
D
256
14

What method do computers use to store negative values?

A
Sign-magnitude
B
One's complement
C
Two's complement
D
Floating-point
15

In an 8-bit signed integer, what does the most significant bit (MSB) being '1' indicate?

A
The number is positive
B
The number is zero
C
The number is negative
D
An overflow has occurred
16

What is the first step in finding the two's complement of a binary number?

A
Add 1 to the LSB
B
Invert all the bits
C
Shift all bits to the left
D
Discard the MSB
17

What is the minimum value for an 8-bit signed integer?

A
-256
B
-128
C
-127
D
0
18

Real values with fractions or decimals are also known as what in computing?

A
Integers
B
Whole numbers
C
Boolean values
D
Floating-point numbers
19

In a 32-bit single-precision floating-point number, how many bits are allocated for the exponent?

A
1
B
8
C
23
D
32
20

In single-precision floating-point representation, how many bits are used for the mantissa?

A
1
B
8
C
23
D
32
21

What is the bias value that is added to the exponent in 32-bit single-precision format?

A
1023
B
255
C
127
D
64
22

In double-precision (64-bit) format, the actual exponent values range from -1022 to what?

A
+1023
B
+127
C
+2048
D
+1024
23

What is the result of the binary addition 1 + 1?

A
1
B
2
C
10 (0 with a carry of 1)
D
11
24

How can binary subtraction (e.g., 9 - 6) be performed?

A
By adding the two's complement of the subtrahend
B
By directly subtracting the bits
C
By converting to decimal first
D
It is not possible in binary
25

What is the result of multiplying the binary numbers 101 and 11?

A
1001
B
1111
C
1101
D
1011
26

Which of these is a key step in binary division?

A
Comparing the divisor with the dividend portion
B
Always adding the numbers
C
Inverting all bits
D
Multiplying by 2
27

What does ASCII stand for?

A
American Standard for Computer Information Interchange
B
Advanced Standard Code for Information Interchange
C
American Standard Code for Information Interchange
D
American Symbolic Code for Internet Interchange
28

How many characters can the original 7-bit ASCII standard represent?

A
64
B
128
C
256
D
512
29

Which encoding scheme is backward compatible with ASCII?

A
UTF-32
B
UTF-16
C
EBCDIC
D
UTF-8
30

Which Unicode format uses a fixed length of 4 bytes for every character?

A
UTF-8
B
UTF-16
C
UTF-32
D
ASCII
31

How many bytes are there in one kilobyte (KB) according to computer storage standards?

A
1000
B
1024
C
100
D
8
32

Images in computers are made up of tiny dots called what?

A
Bits
B
Bytes
C
Pixels
D
Nodes
33

What does RGB stand for in color representation?

A
Red, Green, Black
B
Red, Gray, Blue
C
Red, Green, Blue
D
Right, Green, Blue
34

Which image file format is best used for simple animations and images with few colors?

A
JPEG
B
PNG
C
GIF
D
TIFF
35

Which storage device uses flash memory for faster access times?

A
Hard Disk Drive (HDD)
B
Solid State Drive (SSD)
C
Cloud Storage
D
Magnetic Tape
36

The octal number system has a base of what?

A
2
B
16
C
10
D
8
37

The hexadecimal number '1A3' is equal to what decimal number?

A
419
B
259
C
355
D
500
38

How is the decimal number -5 represented as an 8-bit two's complement binary number?

A
00000101
B
11111010
C
11111011
D
10000101
39

In floating-point representation, what does the mantissa represent?

A
The sign of the number
B
The position of the decimal point
C
The significant digits of the number
D
The size in bytes
40

What is the bias for the exponent in 64-bit double-precision floating-point numbers?

A
127
B
255
C
1023
D
2047
41

The result of the binary subtraction 1001 - 0110 using two's complement is what?

A
0011
B
1101
C
0101
D
0010
42

Which text encoding scheme can represent over a million characters from the world's writing systems?

A
ASCII
B
Extended ASCII
C
Unicode
D
EBCDIC
43

What is the ASCII code for the uppercase letter 'A'?

A
41
B
97
C
65
D
80
44

What will a pixel with RGB values (255, 0, 0) look like?

A
Bright Green
B
Bright Blue
C
White
D
Bright Red
45

What does PNG stand for?

A
Portable Network Graphics
B
Private Network Graphics
C
Permanent Numeric Graphics
D
Photo Network Group
46

Which number system is not directly used by modern computers for work but helps in representing large binary numbers compactly?

A
Decimal
B
Binary
C
Octal
D
Metric
47

What is the binary representation of the decimal number 5?

A
101
B
110
C
011
D
111
48

A 4-Byte whole number consists of how many bits?

A
4
B
8
C
16
D
32
49

The binary addition of 1101 and 1011 results in?

A
11000
B
10100
C
01110
D
11100
50

The first hard drive created in 1956 could store how many bytes?

A
5,000,000
B
500,000
C
5,000
D
5,000,000,000