Robotics Mock 2025

WASSCE style · Exam mode

Robotics Mock 2025

Question 1 of 50

In an Arduino sketch, the code inside loop() runs

A. once, when the board starts B. over and over again while the board has power C. only when a button is pressed D. once a day

Question 2 of 50

In a flowchart, a decision (a yes/no question) is drawn as a

A. rectangle B. diamond C. oval D. parallelogram

Question 3 of 50

Before working on a robot's moving parts, you should first

A. increase the motor speed B. remove the safety guard while it runs C. switch it off and disconnect its power D. touch the motor while it runs

Question 4 of 50

Which development is most closely linked with the First Industrial Revolution (Industry 1.0)?

A. steam-powered machines and mechanisation B. the Internet of Things C. programmable logic controllers D. cloud computing

Question 5 of 50

Cyber-physical systems, the Internet of Things and artificial intelligence are features of

A. Industry 1.0 B. Industry 2.0 C. Industry 3.0 D. Industry 4.0

Question 6 of 50

Roboethics is mainly concerned with

A. using robots responsibly, safely and fairly B. oiling robot joints C. the colour of robots D. robot battery sizes

Question 7 of 50

Which of these is an example of a smart home device?

A. a wooden chair B. a clay pot C. a thermostat that adjusts the room temperature by itself D. a hand broom

Question 8 of 50

Which job mainly involves operating, maintaining and repairing robots in a factory?

A. robotics technician B. patent attorney C. robot ethicist D. sales manager

Question 9 of 50

Which subsystem of a robot gathers information about its surroundings?

A. the actuation subsystem B. the power subsystem C. the sensing subsystem D. the mechanical structure

Question 10 of 50

A robot designed to work safely alongside people, sharing their workspace, is called a

A. collaborative robot (cobot) B. drone C. gantry crane D. conveyor

Question 11 of 50

A stepper motor has a step angle of 1.8°. How many steps make one full revolution?

A. 180 B. 360 C. 200 D. 100

Question 12 of 50

A robot's battery is rated 2,000 mAh. If the robot draws a steady 500 mA, roughly how long will it run?

A. 0.25 hours B. 1 hour C. 2,500 hours D. 4 hours

Question 13 of 50

A robot wheel has a diameter of 7 cm. Roughly how far does the robot move in one turn of the wheel? (Take π = 22/7.)

A. 7 cm B. 14 cm C. 22 cm D. 44 cm

Question 14 of 50

A control system that uses sensor feedback to correct its output is

A. an open-loop system B. a manual system C. a closed-loop system D. a random system

Question 15 of 50

A toaster that runs for a set time without checking how brown the bread is, is an example of

A. open-loop control B. closed-loop control C. PID control D. feedback control

Question 16 of 50

On an Arduino, what does digitalWrite(13, HIGH) do?

A. reads the value of pin 13 B. turns off the board C. sets pin 13 as an input D. sets pin 13 to a high voltage (turns it on)

Question 17 of 50

What path does a robot follow with this program? REPEAT 4 TIMES: move forward 10 cm, turn right 90°

A. a square B. a triangle C. a straight line 40 cm long D. it spins on the spot

Question 18 of 50

Electric power and moving assembly lines for mass production are features of which industrial revolution?

A. the first B. the second C. the third D. the fourth

Question 19 of 50

Electronics, computers, programmable logic controllers and the first industrial robots are linked with the

A. First Industrial Revolution B. Second Industrial Revolution C. Third Industrial Revolution D. Fourth Industrial Revolution

Question 20 of 50

Which list gives four organisational performance indicators often used to judge the effect of robots at work?

A. speed, colour, size and weight B. price, quality, flexibility and innovation C. profit, tax, rent and wages D. safety, noise, heat and light

Question 21 of 50

A factory robot can be reprogrammed in an hour to pack a new product. Which performance indicator does this mainly improve?

A. price B. quality C. innovation D. flexibility

Question 22 of 50

A machine that runs a fixed sequence and cannot sense or respond to changes around it is best described as

A. an autonomous robot B. a humanoid robot C. a cobot D. a non-robotic system

Question 23 of 50

In a feedback control system, the error signal is

A. the power supplied to the motor B. the difference between the desired output and the actual output C. the time the task takes D. the signal sent to a display

Question 24 of 50

In a control system, the reference input is

A. the desired value (set point) that the system aims for B. noise from the motor C. the final output D. a faulty sensor reading

Question 25 of 50

A fire alarm rings when someone breaks the glass and keeps ringing until it is reset. It is usually treated as

A. a PID controller B. a closed-loop speed controller C. a non-feedback (open-loop) system D. a feedback temperature controller

Question 26 of 50

In a finite-state machine (FSM) model of a traffic light, red, amber and green are the

A. inputs B. states C. sensors D. loops

Question 27 of 50

A robot must travel 1.5 m and its wheels have a diameter of 6 cm. Roughly how many turns must each wheel make? (Take π = 3.14.)

A. 25 B. 16 C. 8 D. 3

Question 28 of 50

A joint that rotates around an axis, like an elbow, is a

A. spherical wrist only B. prismatic joint C. fixed joint D. revolute joint

Question 29 of 50

A battery labelled 7.4 V, 2,200 mAh stores about how much energy?

A. 16.3 Wh B. 2.2 Wh C. 7.4 Wh D. 220 Wh

Question 30 of 50

analogWrite(9, 127) on an Arduino Uno sets pin 9 to about

A. 50% PWM duty cycle B. 127 V C. 100% duty cycle D. 0 V

Question 31 of 50

A capacitor across a DC motor's terminals helps to

A. reduce electrical noise B. reverse the motor C. increase its speed greatly D. store the program

Question 32 of 50

The derivative term in PID control helps to

A. reduce overshoot by responding to the rate of change of error B. increase error C. remove the sensor D. add noise

Question 33 of 50

If a robot oscillates around its target, a likely fix is to

A. reduce the proportional gain or add derivative control B. increase speed C. remove the sensor D. use a bigger battery

Question 34 of 50

The word "robot" comes from a Czech word meaning

A. machine B. forced labour C. computer D. metal man

Question 35 of 50

The Arduino function analogRead() returns a value between

A. −1 and 1 B. 0 and 1 C. 0 and 255 D. 0 and 1023

Question 36 of 50

A pull-up resistor ensures a digital input reads

A. HIGH when the switch is open B. LOW always C. random values D. nothing

Question 37 of 50

A gear ratio of 3 : 1 (driven : driver teeth) makes the output

A. slower but with more torque B. faster with less torque C. the same speed D. stop

Question 38 of 50

The integral term in PID control helps to

A. eliminate steady-state error B. cause oscillation only C. remove sensors D. reduce speed always

Question 39 of 50

A driver gear of 12 teeth turns a driven gear of 36 teeth. If the driver rotates at 90 rpm, the driven gear rotates at

A. 30 rpm B. 270 rpm C. 90 rpm D. 45 rpm

Question 40 of 50

Asimov's First Law of Robotics states that a robot may not

A. move without power B. obey orders C. protect itself D. injure a human or allow a human to come to harm

Question 41 of 50

A voltage divider with 10 kΩ and 20 kΩ across 9 V gives across the 20 kΩ resistor

A. 6 V B. 3 V C. 4.5 V D. 9 V

Question 42 of 50

An interrupt service routine (ISR) should be

A. short and fast B. long with delays C. full of print statements D. never used

Question 43 of 50

Forward kinematics of a robot arm calculates

A. the end-effector position from joint angles B. joint angles from position C. battery life D. motor current

Question 44 of 50

The bandwidth of a control loop relates to how

A. quickly the system responds to changes B. big the robot is C. much it costs D. long the cables are

Question 45 of 50

The Nyquist rule says a signal must be sampled at least

A. twice its highest frequency B. once per second C. at its highest frequency D. half its frequency

Question 46 of 50

A low-pass filter on a sensor signal

A. removes high-frequency noise B. removes the signal C. amplifies noise D. adds delay only

Question 47 of 50

A flip-flop is a circuit that

A. stores one bit of data B. amplifies signals C. converts AC to DC D. produces light

Question 48 of 50

Tolerance stacking in an assembly means

A. individual part tolerances add up and affect fit B. parts never fit C. tolerances cancel always D. only one part matters

Question 49 of 50

A finite state machine for a robot changes state based on

A. current state and inputs B. random numbers only C. battery colour D. time of day only

Question 50 of 50

Dead reckoning estimates a robot's position from

A. known speed, heading and time B. GPS only C. cameras only D. guessing

Time left

60:00

Answered0 / 50

Unanswered questions count as wrong.

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