Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 702 · 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 common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
2. 2.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) in opposite directions (c) one up, one down (d) the same direction
3. 3.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
4. 4.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 594 cm?
7. 7.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
8. 8.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
9. 9.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
10. 10.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
12. 12.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) propellers (c) tracks (d) legs
13. 13.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) big (slow and strong) (c) never important (d) zero
14. 14.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black surface (d) a black line
15. 15.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the top speed (d) the wheel size
16. 16.🔍 What does a gyro sensor measure? (a) temperature (b) colour (c) sound (d) turning (rotation)
17. 17.🧭 A robot spins 45° every second. How many seconds does it take to turn 180°?
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
20. 20.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) legs (c) propellers (d) wheels
21. 21.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.🔍 Which sensor helps a robot warn if motors get hot? (a) a light sensor (b) a gyro sensor (c) a camera (d) a temperature sensor
24. 24.🧭 A robot faces west. It does: turn right, turn right, turn left. Which way does it face now? (a) east (b) west (c) north (d) south
25. 25.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) a wheel (c) an output (d) an input
26. 26.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
27. 27.True or false: “a muddy building site” suits legs. (a) False (b) True
28. 28.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
29. 29.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
30. 30.🧭 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 45°, then right 90°. What does the gyro read now (0° to 359°)?
31. 31.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
32. 32.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) propellers (c) legs (d) wheels
33. 33.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) tracks (c) legs (d) propellers
34. 34.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
35. 35.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
36. 36.🧭 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 120°, then right 180°. What does the gyro read now (0° to 359°)?
37. 37.⚙️ A motor makes 30 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
38. 38.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points straight up (c) points up and right (d) points right
39. 39.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
40. 40.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor

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