ZIMSEC O-Level Computer Science Paper 1 Question Paper

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL <br> General Certificate of Education Ordinary Level

**COMPUTER SCIENCE**

4021/1 1 hour

**PAPER 1 Multiple Choice**

SPECIMEN PAPER

Additional materials: Multiple Choice answer sheet Soft clean eraser Soft pencil (type B or HB is recommended)

INSTRUCTIONS TO CANDIDATES

Answer all questions. For each question, there are four possible answers, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) and \(\mathbf{D}\). Choose the correct answer. Record your choice in soft pencil on the separate answer sheet provided.

Read very carefully the instructions on the answer sheet.

INFORMATION FOR CANDIDATES

There are forty questions in this paper. Each correct answer will score one mark. Any rough working should be done in this question paper.

Question 1

A storage technology with fastest access time is

A SSD.

B HDD.

C Optical Disk.

D Flash Disk.

Question 2

Which software is used to organize and store student data for a school?

A Presentation software

B Database software

C Graphics software

D Word processing software

Question 3

Utility software is an example of

A application software.

B customized software.

C communication software.

D system software.

Question 4

HDD stands for

A Hardware Disk Drive.

B High Definition Device.

C Hard Disk Drive.

D High Disk Drive.

Question 5

Which one is a characteristic of a control system?

A Dedicated to one task

B Do not involve feedback

C Can have several tasks

D Lack of the ability to collect and analyse

Question 6

Which sensor is used in a greenhouse?

A Pressure sensor

B Proximity sensor

C Acoustic sensor

D Humidity sensor

Question 7

Android applications are packed in

A APK file format.

B Axe file format.

C ZIP file format.

D file format.

Question 8

Flight simulation is used to train pilots because

A flight simulations are more realistic than flying an actual plane.

B it enables dangerous flight situations in real life to be modeled.

C the modeled plane behaves more unpredictably.

D it is easier to fly a virtual plane.

Question 9

Which of the following logic gates represents a buffer gate?

Question 10

The truth table for an OR gate is

A Input A Input B Output

| 0 | 0 | 0 | | :---: | :---: | :---: | | 0 | 1 | 1 | | 1 | 0 | 1 | | 1 | 1 | 1 |

B Input A Input B Output

| 0 | 0 | 1 | | :---: | :---: | :---: | | 0 | 1 | 1 | | 1 | 0 | 1 | | 1 | 1 | 0 |

C Input A Input B Output

| 0 | 0 | 0 | | :--- | :--- | :--- | | 0 | 1 | 1 | | 1 | 0 | 1 | | 1 | 1 | 0 |

| Input A | Input B | Output | | :---: | :---: | :---: | | 0 | 0 | 1 | | 0 | 1 | 0 | | 1 | 0 | 0 | | 1 | 1 | 1 |

Question 11

A hexadecimal number \(\mathbf{A D}\) in binary is

A 10101101

B 11011010

C 10110101

D 10101100

Question 12

Which logic circuit represents the expression \(\mathbf{X}=\mathrm{A}+\mathrm{BC}\) ?

Question 13

A device responsible for finding an optimal route through which to send data packets on a WAN is

A modem.

B router.

C layer-2 switch.

D network interface card.

Question 14

A network model suitable for two friends sharing a PDF document using Bluetooth technology is

A PAN.

B LAN.

C Peer to peer.

D Client server.

Question 15

A computer is unable to access the internet but can communicate with the local network devices.

What should be checked first?

A router configuration

B cable connections

C cookies

D domain name system settings

Question 16

Error detection and correction at the destination is done in which layer of the OSI model?

A Application

B Network

C Data link

D Physical

Question 17

Which security measure is used to ensure data integrity by keying data twice?

A Check sum

B Firewall

C Format check

D Verification

Question 18

Authentication involves the use of

A passwords, biometric sensors and pincodes.

B firewall, magnetic stripes and pincodes.

C biometric sensors, proxy servers and tokens.

D antispyware, passwords and biometric sensors.

Question 19

A technique of scrambling data into a format that is not readable by unauthorized users is

A updating.

B authorization.

C encryption.

D validation.

Question 20

Which expert is hired to test security systems?

A white hat hacker

B black hat hacker

C programmer

D cracker

Question 21

The testing strategy performed to identify bugs before releasing software to real users or the public is

A Top down testing.

B White box testing.

C Alpha testing.

D Beta testing.

Question 22

The first step in the system development life cycle is

A system design.

B coding.

C system testing.

D preliminary investigation.

Question 23

The best test strategy to use when testing a code that deletes an old student record is

A integration testing.

B unit testing.

C module testing.

D system testing.

Question 24

Which system development stage performs cost benefit analysis?

A Design stage

B Feasibility

C Analysis

D Development

Question 25

If statements and select case statements are

A decision making constraints.

B sequence constraints.

C iteration constraints.

D looping constraints.

Question 26

Given the following algorithms

Start \(\mathrm{a}=2\) \(\mathrm{b}=3\) \(\mathrm{c}=4\) \(\mathrm{X}=\mathrm{a}+\mathrm{b}+\mathrm{c}\) Display X End

The output is

A 12.

B 20.