Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 892 · 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 servo program runs:
   angle = 50
   angle = angle + 40
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.🧭 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 120°, then left 135°. What does the gyro read now (0° to 359°)?
3. 3.Which of these suits propellers? (a) deep mud (b) moving under water (c) a flat road (d) a long factory floor
4. 4.🔍 Which sensor helps a robot know a button is pressed? (a) a camera (b) a light sensor (c) a touch sensor (d) a distance sensor
5. 5.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
6. 6.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22 (c) 22/7 (d) 7/22
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
9. 9.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
10. 10.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster but weaker
11. 11.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) see colours (c) hear claps (d) smell smoke
12. 12.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
13. 13.🦾 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 straight up (b) points up and left (c) points up and right (d) points right
14. 14.True or false: to follow a black line, use a temperature sensor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
16. 16.📡 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?
17. 17.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) propellers (c) tracks (d) wheels
18. 18.Which of these suits wheels? (a) loose sand dunes (b) a field of tall boulders (c) deep mud (d) a hospital corridor
19. 19.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
20. 20.🛞 Circumference = π × … (a) diameter (b) weight (c) radius only (d) speed
21. 21.🦾 A servo moves from 170° to 130°. How many degrees does it turn?
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
23. 23.🧭 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 left 60°, then right 30°, then right 135°. What does the gyro read now (0° to 359°)?
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
25. 25.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
27. 27.True or false: to know a button is pressed, use a gyro sensor. (a) True (b) False
28. 28.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
29. 29.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
31. 31.🧭 A robot faces south. It does: turn right, turn right, turn right. Which way does it face now? (a) east (b) north (c) west (d) south
32. 32.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
33. 33.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) the same direction (d) in opposite directions
34. 34.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to be heavier (d) to look colourful
35. 35.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
36. 36.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 308 cm?
37. 37.📡 A robot is 160 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
38. 38.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
39. 39.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times slower (d) 3 times faster
40. 40.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 33. What is under the sensor? (a) the black line (b) the white floor

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