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MCQs — Computer Systems

Practice questions for Computer Science.

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Question 201

What is the decimal value of the hexadecimal digit F?

A. 10

B. 14

C. 15

D. 16

Question 202

Why is hexadecimal often used to write binary values?

A. Each hex digit stands for exactly four bits, so numbers become shorter

B. Computers cannot store binary

C. It uses fewer digits than decimal

D. It is the only system a CPU understands

Question 203

What is the decimal value of the hexadecimal number 2F?

A. 37

B. 57

C. 215

D. 47

Question 204

What is the decimal value of the hexadecimal number A5?

A. 165

B. 105

C. 155

D. 175

Question 205

A colour code uses FF for the maximum intensity of one colour channel. What is FF in decimal?

A. 16

B. 256

C. 255

D. 225

Question 206

Which statement about data inside a computer is correct?

A. Text is stored as letters, and pictures as photographs

B. All data is represented internally as patterns of 0s and 1s

C. Only numbers can be stored in binary

D. Sound cannot be stored in a computer

Question 207

In ASCII, the letters and symbols on the keyboard are stored as:

A. Photographs

B. Numeric codes in binary

C. Sounds

D. Handwritten shapes

Question 208

How many bytes are needed to store the word HELLO if each character uses one byte?

A. 5

B. 4

C. 6

D. 8

Question 209

A small black-and-white image has 16 pixels, and each pixel is either black or white. What is the minimum number of bits needed to store it?

A. 4

B. 8

C. 32

D. 16

Question 210

How is a picture stored in a computer?

A. As a grid of pixels, each represented by numbers

B. As a printed sheet inside the CPU

C. As a sound file only

D. As a set of letters typed by the user

Question 211

What is the binary equivalent of the decimal number 13?

A. 1011

B. 1101

C. 1110

D. 1001

Question 212

What is the binary equivalent of the decimal number 20?

A. 10100

B. 10010

C. 11000

D. 10101

Question 213

Convert the binary number 1110 to decimal.

A. 12

B. 15

C. 14

D. 16

Question 214

Convert the decimal number 30 to hexadecimal.

A. 1F

B. 1E

C. 2E

D. E1

Question 215

What is the binary equivalent of the hexadecimal number 3B?

A. 111011

B. 110111

C. 101011

D. 111101

Question 216

Convert the binary number 10101111 to hexadecimal.

A. AE

B. FA

C. BF

D. AF

Question 217

Hardware engineering is the field concerned with:

A. Writing programs and apps

B. Designing, developing and testing the physical parts of computers

C. Creating websites and web pages

D. Managing databases and records

Question 218

Which activity belongs to hardware engineering?

A. Writing a mobile game

B. Designing a database for a school

C. Designing a circuit board for a computer

D. Creating a website layout

Question 219

Why is testing an important stage in hardware engineering?

A. To make sure the components work reliably and safely before being produced in large numbers

B. To decide what colour the software should be

C. To write the program code

D. To avoid using any electricity

Question 220

Software engineering is best described as:

A. The manufacturing of computer chips

B. The repair of broken keyboards

C. The assembly of computer cases

D. A systematic approach to designing, developing, testing and maintaining software

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