Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 130 · 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 job needs a temperature sensor? (a) hear a whistle (b) warn if motors get hot (c) measure a turn angle (d) start on a hand clap
2. 2.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
3. 3.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
5. 5.Which of these suits tracks? (a) deep mud (b) moving under water (c) a field of tall boulders (d) a smooth classroom floor
6. 6.📡 A robot is 230 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 13 seconds (in cm)?
7. 7.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) in opposite directions (d) the same direction
8. 8.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22 (c) 7/22 (d) 22/7
9. 9.🔍 Which sensor helps a robot stop before a wall? (a) a sound sensor (b) a camera (c) a light sensor (d) a distance sensor
10. 10.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
11. 11.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) propellers (c) tracks (d) legs
12. 12.Which job needs a sound sensor? (a) warn if motors get hot (b) feel a bump into a wall (c) hear a whistle (d) measure how far a box is
13. 13.🧭 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 60°, then left 135°. What does the gyro read now (0° to 359°)?
14. 14.🔍 Which sensor helps a robot measure how far a box is? (a) a light sensor (b) a temperature sensor (c) a gyro sensor (d) a distance sensor
15. 15.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
16. 16.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
17. 17.Which of these suits tracks? (a) a hospital corridor (b) a long factory floor (c) stepping over wide gaps (d) soft snow
18. 18.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
19. 19.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
20. 20.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
21. 21.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
22. 22.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points straight up (c) points up and right (d) points right
24. 24.🧭 A robot should turn right 180°, but its gyro shows it turned 167°. How many degrees must it turn more to the right?
25. 25.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
26. 26.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
27. 27.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 54. What is under the sensor? (a) the white floor (b) the black line
28. 28.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
29. 29.🧭 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 left 90°, then left 135°, then left 135°. What does the gyro read now (0° to 359°)?
30. 30.Which of these suits propellers? (a) loose sand dunes (b) moving under water (c) stepping over wide gaps (d) a flat road
31. 31.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
33. 33.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
35. 35.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it uses a sail (c) one wheel runs faster (d) it jumps
36. 36.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
37. 37.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
39. 39.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points straight up (c) points right (d) points left

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