Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 355 · 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 way of moving suits this best: “hovering over a roof”? (a) wheels (b) propellers (c) legs (d) tracks
2. 2.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
3. 3.Which of these suits wheels? (a) loose sand dunes (b) flying over a field (c) a flat road (d) stepping over wide gaps
4. 4.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
5. 5.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
7. 7.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
8. 8.🧭 A robot should turn right 180°, but its gyro shows it turned 166°. How many degrees must it turn more to the right?
9. 9.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.🧭 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 right 180°. What does the gyro read now (0° to 359°)?
11. 11.True or false: “a muddy building site” suits tracks. (a) False (b) True
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 40. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
13. 13.Which of these suits wheels? (a) flying over a field (b) a long factory floor (c) soft snow (d) hovering over a roof
14. 14.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
16. 16.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
18. 18.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
19. 19.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) stays still (c) spins left on the spot (d) spins right on the spot
20. 20.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) black (d) white
21. 21.🔍 What does a gyro sensor measure? (a) sound (b) colour (c) temperature (d) turning (rotation)
22. 22.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
23. 23.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
24. 24.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) a gear (d) an input
25. 25.🧭 A robot should turn right 45°, but its gyro shows it turned 44°. How many degrees must it turn more to the right?
26. 26.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a temperature sensor (c) a light sensor (d) a camera
27. 27.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times bigger (d) 3 times louder
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns left (b) spins left on the spot (c) turns right (d) stays still
29. 29.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
30. 30.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 340 cm (c) 1 km (d) 34 cm
31. 31.⚙️ 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
32. 32.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
33. 33.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
35. 35.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) wheels (c) tracks (d) legs
36. 36.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
39. 39.Which of these suits tracks? (a) hovering over a roof (b) flying over a field (c) a smooth classroom floor (d) loose sand dunes
40. 40.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 54. What is under the sensor? (a) the white floor (b) the black line

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