Computing Mock 2020

WASSCE style · Study mode

Computing Mock 2020

Question 1 of 50

A multi-core processor

A. has more RAM B. has more than one processing unit on a chip C. has a bigger screen D. uses vacuum tubes

Question 2 of 50

The Boolean expression for an AND gate with inputs A and B is

A. Ā B. A + B C. A · B D. A ⊕ B

Question 3 of 50

What is the output of: x = 5; x += 3; print(x)

A. 53 B. 5 C. 3 D. 8

Question 4 of 50

Which data type is the value 3.14 in Python?

A. int B. float C. str D. bool

Question 5 of 50

Which symbol starts a comment in Python?

A. -- B. // C. /* D. #

Question 6 of 50

Which keyword is used to return a value from a function?

A. yield only B. print C. return D. break

Question 7 of 50

Linear search checks items

A. by halving the list B. one by one from the start C. randomly D. only at the end

Question 8 of 50

The protocol that transfers files between computers on a network is

A. DNS B. SMTP C. FTP D. HTML

Question 9 of 50

A database table is made up of

A. records (rows) and fields (columns) B. only images C. only formulas D. slides

Question 10 of 50

A query in a database is used to

A. retrieve specific information B. draw pictures C. format text D. print slides

Question 11 of 50

Malware that demands payment to unlock files is

A. ransomware B. adware C. spyware D. a firewall

Question 12 of 50

The Internet of Things (IoT) refers to

A. everyday devices connected to the internet B. only computers C. printed books D. telephone lines only

Question 13 of 50

Cloud computing means

A. using computing services over the internet B. computing during rain C. storing data only on paper D. using a calculator

Question 14 of 50

The motherboard connects

A. the internet B. only the monitor C. only the printer D. the CPU, memory and other components

Question 15 of 50

Utility software performs

A. games B. word processing C. maintenance tasks such as backup and antivirus D. web design

Question 16 of 50

An example of system software is

A. a photo editor B. a spreadsheet C. a game D. an operating system

Question 17 of 50

A server in a network

A. only displays B. only prints C. provides services or resources to other computers D. has no storage

Question 18 of 50

A selection construct in a program allows

A. repeating forever B. choosing between paths based on a condition C. storing data only D. printing only

Question 19 of 50

The <img> tag is used to

A. display an image on a web page B. create a link C. make a heading D. start a table

Question 20 of 50

The <p> tag defines a

A. paragraph B. picture C. program D. page link

Question 21 of 50

A barcode reader reads data using

A. reflected light B. magnetism C. sound D. heat

Question 22 of 50

RAM stands for

A. Random Access Memory B. Read Access Memory C. Run All Memory D. Real Active Memory

Question 23 of 50

The von Neumann architecture stores

A. instructions on paper B. only data in memory C. program instructions and data in the same memory D. data only in the CPU

Question 24 of 50

The accumulator is a register that

A. controls the screen B. holds the next instruction address C. stores files D. holds the results of ALU calculations

Question 25 of 50

The MAR holds the

A. current instruction B. data being transferred C. address of the memory location being accessed D. result of a calculation

Question 26 of 50

A NOR gate outputs 1 only when

A. inputs differ B. all inputs are 1 C. one input is 1 D. all inputs are 0

Question 27 of 50

How many rows are in the truth table of a 3-input logic gate?

A. 6 B. 8 C. 3 D. 9

Question 28 of 50

What does range(5) produce?

A. 0 to 5 inclusive B. 1, 2, 3, 4, 5 C. 0, 1, 2, 3, 4 D. 5 only

Question 29 of 50

What is the output of print("Hi" * 3)?

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

Question 30 of 50

What is the output of print(10 > 3 and 2 > 5)?

A. error B. True C. 10 D. False

Question 31 of 50

Bubble sort repeatedly

A. picks a pivot B. splits the list in half C. swaps adjacent items that are in the wrong order D. reverses the list

Question 32 of 50

A tree data structure has a top node called the

A. stack B. leaf C. branch D. root

Question 33 of 50

TCP/IP is

A. an operating system B. a type of cable C. a browser D. the suite of protocols the internet uses

Question 34 of 50

A packet in networking is

A. a type of cable B. a small unit of data sent over a network C. a router D. a website

Question 35 of 50

Latency in a network is the

A. number of users B. amount of data C. delay before data begins to transfer D. cable length

Question 36 of 50

The SQL command to change existing data is

A. UPDATE B. SELECT C. INSERT D. CREATE

Question 37 of 50

Agile software development works in

A. short iterations with frequent feedback B. one long phase C. no planning D. paper only

Question 38 of 50

Social engineering attacks

A. trick people into revealing confidential information B. damage hardware C. cool servers D. speed up networks

Question 39 of 50

The power supply unit converts

A. DC to AC B. mains AC to low-voltage DC for components C. data to light D. sound to data

Question 40 of 50

A router forwards data between

A. one computer's parts B. different networks C. keyboard and mouse D. printer and paper

Question 41 of 50

Pattern recognition in computational thinking means

A. typing fast B. drawing patterns C. coding colours D. spotting similarities between problems

Question 42 of 50

Simplify A · Ā.

A. 0 B. 1 C. A D. Ā

Question 43 of 50

Simplify A + 1.

A. 1 B. A C. 0 D. Ā

Question 44 of 50

Touchscreens detect input by

A. sensing pressure or electrical changes from touch B. sound C. smell D. heat only

Question 45 of 50

A hybrid topology

A. combines two or more topologies B. uses no cables C. has one computer D. is a ring only

Question 46 of 50

A two-dimensional array is like a

A. table with rows and columns B. single list C. tree D. stack

Question 47 of 50

A brute-force attack tries to

A. guess passwords by trying all combinations B. flood a network C. trick users by email D. encrypt files

Question 48 of 50

In the waterfall model, each phase

A. is completed before the next begins B. runs in parallel C. is repeated weekly D. is skipped

Question 49 of 50

Encryption with a public and private key pair is

A. asymmetric encryption B. symmetric encryption C. hashing D. compression

Question 50 of 50

A hash function is used to

A. produce a fixed-length digest of data B. decrypt files C. compress images D. route packets

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