Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 881 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
2. 2.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 360° (d) 100°
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 90°. It turns right 30°, then right 60°. What does the gyro read now (0° to 359°)?
4. 4.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
5. 5.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 3 seconds (in cm)?
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
7. 7.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driven gear (c) driver gear (d) idler gear
8. 8.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
9. 9.Which job needs a distance sensor? (a) follow a black line (b) read a QR code (c) warn if motors get hot (d) measure how far a box is
10. 10.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
11. 11.🧭 A robot should turn right 180°, but its gyro shows it turned 170°. How many degrees must it turn more to the right?
12. 12.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
13. 13.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?
14. 14.🧭 A robot faces west. It does: turn right, turn left, turn around. Which way does it face now? (a) south (b) west (c) north (d) east
15. 15.🔍 Which sensor helps a robot start on a hand clap? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a touch sensor
16. 16.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) propellers (c) legs (d) tracks
17. 17.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black is wet (d) black soaks up light
18. 18.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) propellers (d) tracks
19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
20. 20.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
21. 21.Which of these suits tracks? (a) a flat road (b) stepping over wide gaps (c) hovering over a roof (d) loose sand dunes
22. 22.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 90° (c) 45° (d) 360°
23. 23.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
24. 24.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
26. 26.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 2/7 (c) 7/22 (d) 22/7
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
28. 28.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) colour (d) temperature
29. 29.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a wheel (d) a gear
31. 31.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
33. 33.📡 A robot is 260 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 30 seconds (in cm)?
34. 34.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
35. 35.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) harder to balance (d) they are too cheap
36. 36.⚙️ A motor makes 40 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
37. 37.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
39. 39.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
40. 40.True or false: to know a button is pressed, use a temperature sensor. (a) True (b) False

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