Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 287 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
3. 3.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 270°. It turns right 30°, then left 135°. What does the gyro read now (0° to 359°)?
4. 4.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is wet (d) black is hot
5. 5.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
7. 7.🔍 Which sensor helps a robot hear a whistle? (a) a light sensor (b) a touch sensor (c) a sound sensor (d) a camera
8. 8.🔍 What does a gyro sensor measure? (a) sound (b) colour (c) temperature (d) turning (rotation)
9. 9.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns right 180°, then left 45°, then right 120°. What does the gyro read now (0° to 359°)?
10. 10.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
11. 11.Which job needs a gyro sensor? (a) follow a black line (b) feel a bump into a wall (c) measure how far a box is (d) measure a turn angle
12. 12.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.True or false: “moving under water” suits propellers. (a) True (b) False
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 85. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
15. 15.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
16. 16.True or false: to measure how far a box is, use a light sensor. (a) False (b) True
17. 17.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.Which job needs a gyro sensor? (a) spot a red ball (b) start on a hand clap (c) stay balanced upright (d) feel a bump into a wall
19. 19.🧭 A robot spins 30° every second. How many seconds does it take to turn 60°?
20. 20.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.Which job needs a light sensor? (a) stop before a wall (b) feel a bump into a wall (c) know a button is pressed (d) follow a black line
22. 22.Which of these suits legs? (a) a smooth classroom floor (b) soft snow (c) hovering over a roof (d) crossing stepping-stones
23. 23.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
24. 24.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
25. 25.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns left 180°, then right 180°, then right 180°. What does the gyro read now (0° to 359°)?
26. 26.⚙️ The gear fixed to the motor is called the … (a) tyre (b) idler gear (c) driver gear (d) driven gear
27. 27.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
28. 28.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
29. 29.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a goldfish (d) a snail
30. 30.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are round (c) they spin in the air (d) they are shiny
31. 31.🧭 A robot should turn right 180°, but its gyro shows it turned 186°. How many degrees must it turn back to the left?
32. 32.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
33. 33.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 Circumference = π × … (a) speed (b) weight (c) radius only (d) diameter
35. 35.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a light sensor (c) a sound sensor (d) a camera
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
37. 37.🧭 A robot should turn right 90°, but its gyro shows it turned 75°. How many degrees must it turn more to the right?
38. 38.True or false: to read a QR code, use a camera. (a) False (b) True
39. 39.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
40. 40.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?

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