Computing Mock 2021

WASSCE style · Study mode

Computing Mock 2021

Question 1 of 50

In a star topology, all devices connect to

A. a central switch or hub B. a single cable C. each other in a ring D. no central device

Question 2 of 50

In a bus topology, all devices share

A. a single main cable (backbone) B. a central switch C. a ring D. wireless only

Question 3 of 50

An array stores

A. elements of the same type in contiguous positions B. only one value C. files on disk D. web pages

Question 4 of 50

In most programming languages, the first index of an array is

A. 0 B. 1 C. −1 D. 10

Question 5 of 50

A queue follows the principle of

A. First In, First Out B. Last In, First Out C. random access D. sorted order only

Question 6 of 50

What does print(2 ** 3) output?

A. 8 B. 6 C. 9 D. 5

Question 7 of 50

Which loop runs while a condition is true?

A. while B. for each only C. if D. def

Question 8 of 50

What does "Ghana"[0] return?

A. G B. h C. a D. Ghana

Question 9 of 50

Which function converts the string "5" to an integer?

A. int() B. str() C. float() only D. len()

Question 10 of 50

Multitasking allows

A. several programs to run at the same time B. only one program to run C. the computer to shut down D. hardware to be removed

Question 11 of 50

A firewall in a network

A. filters incoming and outgoing traffic B. speeds up the CPU C. prints documents D. stores files

Question 12 of 50

Which storage medium uses lasers to read data?

A. optical disc (CD/DVD) B. hard disk C. flash drive D. magnetic tape

Question 13 of 50

A chatbot that answers questions in natural language is an example of

A. artificial intelligence B. a spreadsheet C. a compiler D. a hardware fault

Question 14 of 50

JavaScript is mainly used to

A. make web pages interactive B. design databases only C. build hardware D. format hard disks

Question 15 of 50

The SQL command to add a new record is

A. INSERT B. SELECT C. DROP D. ALTER

Question 16 of 50

The SQL clause used to filter records is

A. WHERE B. ORDER BY C. FROM D. GROUP

Question 17 of 50

Convert binary 1101 to denary.

A. 11 B. 13 C. 14 D. 9

Question 18 of 50

Magnetic Ink Character Recognition (MICR) is used mainly by

A. banks to read cheques B. schools to mark exams C. shops to read barcodes D. phones to read faces

Question 19 of 50

A mesh topology is reliable because

A. there are multiple paths between devices B. it uses one cable C. it has no connections D. it is cheap

Question 20 of 50

In a ring topology, data travels

A. around the ring from device to device B. only to a hub C. randomly D. only upward

Question 21 of 50

A linked list stores each element with

A. a pointer to the next element B. an index number only C. a fixed size D. no data

Question 22 of 50

The kernel is the

A. core part of an operating system B. screen saver C. web browser D. antivirus

Question 23 of 50

Disk defragmentation

A. rearranges file fragments so they are stored together B. deletes all files C. encrypts data D. formats the disk

Question 24 of 50

Virtual memory uses

A. part of the storage drive as extra RAM B. the internet C. the screen D. the keyboard

Question 25 of 50

DHCP automatically assigns

A. IP addresses to devices B. passwords C. file names D. MAC addresses

Question 26 of 50

Cat6 cable is a type of

A. twisted-pair Ethernet cable B. fibre-optic cable C. coaxial cable D. power cable

Question 27 of 50

A VPN provides

A. a secure encrypted connection over a public network B. free internet C. faster CPUs D. more storage

Question 28 of 50

Training data in machine learning is used to

A. teach the model patterns B. delete the model C. print reports D. cool the computer

Question 29 of 50

Bias in AI systems can arise from

A. unrepresentative training data B. fast processors C. large screens D. cloud storage

Question 30 of 50

A server-side language used with databases on websites is

A. PHP B. HTML C. CSS D. JPEG

Question 31 of 50

Convert denary 255 to hexadecimal.

A. EE B. F0 C. FF D. 100

Question 32 of 50

A colour image with 8 bits per pixel can show how many colours?

A. 8 B. 256 C. 16 D. 65,536

Question 33 of 50

Unicode was developed to

A. encrypt data B. compress images C. represent characters from all the world's writing systems D. speed up CPUs

Question 34 of 50

Lossy compression

A. only works on text B. keeps every bit C. increases file size D. permanently removes some data to reduce file size

Question 35 of 50

Add binary 1011 + 0110.

A. 1101 B. 10001 C. 10101 D. 11001

Question 36 of 50

What does print("Hi" * 3) display?

A. Hi Hi Hi B. Hi3 C. HiHiHi D. an error

Question 37 of 50

What does int("7") + 3 give?

A. 73 B. "73" C. 10 D. an error

Question 38 of 50

Pushing 1, 2, 3 onto a stack and popping once returns

A. 3 B. 1 C. 2 D. nothing

Question 39 of 50

DNS is used to

A. translate domain names into IP addresses B. encrypt data C. assign MAC addresses D. route packets

Question 40 of 50

The topology in which all nodes connect to a central switch is

A. star B. bus C. ring D. mesh

Question 41 of 50

A foreign key is a field that

A. refers to the primary key of another table B. uniquely identifies records in its table C. is always numeric D. is encrypted

Question 42 of 50

Which SQL clause filters rows?

A. WHERE B. ORDER BY C. SELECT D. FROM

Question 43 of 50

How many times does for i in range(2, 10, 3) loop?

A. 2 B. 8 C. 4 D. 3

Question 44 of 50

What does print(2 ** 3 ** 2) display?

A. 64 B. 512 C. 36 D. 12

Question 45 of 50

What is the output of print([x * 2 for x in range(3)])?

A. [2, 4, 6] B. [0, 2, 4] C. [0, 1, 2] D. [1, 2, 3]

Question 46 of 50

After a = [1, 2]; b = a; b.append(3), the value of a is

A. an error B. [1, 2] C. [3] D. [1, 2, 3]

Question 47 of 50

What is bool("") in Python?

A. True B. False C. None D. an error

Question 48 of 50

The maximum number of comparisons a binary search needs for 1,000 sorted items is about

A. 1000 B. 500 C. 10 D. 100

Question 49 of 50

How many usable host addresses are in a /24 IPv4 subnet?

A. 254 B. 256 C. 255 D. 24

Question 50 of 50

Normalisation aims mainly to

A. reduce data redundancy B. increase duplication C. speed up typing D. remove keys

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.