Robotics Mock 2023

WASSCE style · Study mode

Robotics Mock 2023

Question 1 of 50

The three main functions of a robot are

A. eat, sleep and move B. sense, think (process) and act C. print, scan and copy D. store, send and delete

Question 2 of 50

The part of a robot that processes information and makes decisions is the

A. wheel B. chassis C. controller (microcontroller) D. battery

Question 3 of 50

An LDR is used to detect

A. humidity B. sound C. pressure D. light level

Question 4 of 50

A motor that can be turned to a precise angle, such as 90°, is a

A. solenoid B. DC motor without feedback C. AC fan motor D. servo motor

Question 5 of 50

A control system that uses feedback from sensors is

A. closed-loop B. open-loop C. manual D. random

Question 6 of 50

In Arduino code, the function that runs repeatedly is

A. loop() B. setup() C. main() D. start()

Question 7 of 50

The Arduino function delay(1000) pauses the program for

A. 1 second B. 1 minute C. 1,000 seconds D. 0.1 second

Question 8 of 50

Before working on a robot's wiring you should

A. disconnect the power B. increase the voltage C. run the motors D. remove the sensors only

Question 9 of 50

Industrial robots are often surrounded by safety fences to

A. keep people out of their working area B. make them faster C. cool them D. hide them

Question 10 of 50

Lithium batteries in robots should be

A. charged with the correct charger and never punctured B. heated C. soaked in water D. short-circuited

Question 11 of 50

Laser cutters are used in robotics to

A. cut precise parts from acrylic or plywood B. program robots C. charge batteries D. test sensors

Question 12 of 50

Tinkercad and Fusion 360 are examples of

A. CAD software B. operating systems C. browsers D. spreadsheets

Question 13 of 50

A chassis in a mobile robot is the

A. main frame that holds the parts B. program C. sensor D. battery

Question 14 of 50

An "if" statement in a robot program is used to

A. make decisions based on conditions B. repeat forever C. store data D. draw shapes

Question 15 of 50

A variable in a program is

A. a named storage location for data B. a motor C. a sensor D. a battery

Question 16 of 50

When troubleshooting a robot that does not move, you should first check

A. the power supply and connections B. the paint colour C. the program comments D. the robot's name

Question 17 of 50

A multimeter can help troubleshoot a robot by

A. checking battery voltage and continuity B. writing code C. printing parts D. cutting acrylic

Question 18 of 50

An autonomous robot is one that

A. has no sensors B. is always remote-controlled C. cannot move D. makes decisions and acts without human control

Question 19 of 50

A robot vacuum cleaner is an example of a

A. military drone B. industrial welding robot C. service robot D. humanoid

Question 20 of 50

A humanoid robot is designed to

A. swim only B. look like a car C. fly only D. resemble the human body

Question 21 of 50

The power supply of a mobile robot is usually a

A. petrol engine B. rechargeable battery C. solar panel only D. wind turbine

Question 22 of 50

Wheels, tracks and legs are examples of

A. controllers B. sensors C. locomotion systems D. programs

Question 23 of 50

A gripper is a type of

A. program B. sensor C. battery D. end effector

Question 24 of 50

A touch (bump) sensor detects

A. sound B. light C. physical contact D. temperature

Question 25 of 50

A colour sensor can help a robot to

A. measure weight B. sort objects by colour C. hear sounds D. charge itself

Question 26 of 50

Torque is the

A. voltage of a battery B. speed of a motor C. turning force of a motor D. weight of a robot

Question 27 of 50

An open-loop control system

A. corrects errors automatically B. always uses sensors C. does not use feedback D. is the same as PID

Question 28 of 50

In block-based coding (e.g. Scratch), a "forever" block

A. stops the program B. runs once C. repeats the enclosed instructions continuously D. deletes code

Question 29 of 50

The Arduino function pinMode(9, OUTPUT) sets pin 9 as

A. an output B. an input C. a ground D. an analogue reader

Question 30 of 50

A function in a program is

A. a named block of code that performs a task B. a sensor C. a wire D. a battery

Question 31 of 50

Each independent movement of a robot arm is a

A. cycle B. gear ratio C. sensor D. degree of freedom

Question 32 of 50

An ultrasonic sensor measures distance by

A. measuring light colour B. timing the echo of sound waves C. detecting heat D. weighing objects

Question 33 of 50

A sensor used to follow a black line on a white floor is an

A. temperature sensor B. ultrasonic sensor C. infrared (IR) reflectance sensor D. microphone

Question 34 of 50

The speed of a DC motor is commonly controlled by

A. changing its colour B. pulse-width modulation (PWM) C. adding sensors D. reversing the battery

Question 35 of 50

A circuit used to reverse the direction of a DC motor is an

A. voltage divider only B. LDR C. H-bridge D. LED driver

Question 36 of 50

In a PID controller, the "I" stands for

A. integral B. input C. inverse D. instant

Question 37 of 50

The Arduino command to set pin 13 HIGH is

A. digitalWrite(13, HIGH); B. analogRead(13); C. pinMode(HIGH, 13); D. digitalRead(13, HIGH);

Question 38 of 50

A light curtain around a robot cell

A. stops the robot when someone enters B. lights the room C. charges the robot D. paints the robot

Question 39 of 50

Collaborative robots (cobots) are designed to

A. work safely alongside humans B. work only in cages C. replace all workers D. move at maximum speed always

Question 40 of 50

A robot following a line uses an algorithm that repeatedly

A. reads the sensors and adjusts the motors B. turns off C. prints messages only D. charges the battery

Question 41 of 50

In a PID controller, the proportional term responds to the

A. current error B. past errors C. future error D. battery level

Question 42 of 50

Gears in a robot are used to

A. store energy B. change speed and torque C. sense light D. run code

Question 43 of 50

A gyroscope sensor measures

A. sound level B. distance C. colour D. rotation or orientation

Question 44 of 50

An encoder on a motor measures

A. light B. temperature C. how far the shaft has turned D. air pressure

Question 45 of 50

Analogue sensors give

A. only sound B. only 0 or 1 C. no output D. a range of values

Question 46 of 50

A stepper motor moves in

A. continuous random spins B. precise fixed steps C. jumps only when hot D. reverse only

Question 47 of 50

Batteries connected in series

A. reduce voltage B. add their capacities only C. cancel out D. add their voltages

Question 48 of 50

A motor driver is needed because microcontroller pins

A. are too powerful B. cannot supply enough current for motors C. have no voltage D. only work with LEDs

Question 49 of 50

A thermostat is an example of

A. manual control only B. open-loop control C. no control D. closed-loop control

Question 50 of 50

The set point in a control system is the

A. measured value B. desired value C. error D. output only

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