Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 350 · 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 light sensor reads below 60 over a black line and above 60 over the white floor. It reads 80. What is under the sensor? (a) the black line (b) the white floor
2. 2.True or false: “deep mud” suits wheels. (a) True (b) False
3. 3.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
4. 4.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a track (d) a caster wheel
5. 5.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
6. 6.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 2/7 (d) 7/22
7. 7.Which of these suits legs? (a) a flat road (b) loose sand dunes (c) moving under water (d) crossing stepping-stones
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 72. What is under the sensor? (a) the black line (b) the white floor
9. 9.🔍 Which sensor helps a robot know a button is pressed? (a) a gyro sensor (b) a touch sensor (c) a camera (d) a light sensor
10. 10.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
11. 11.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a snail (c) a cow (d) a goldfish
12. 12.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 28. What is under the sensor? (a) the black line (b) the white floor
13. 13.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) sound (c) temperature (d) colour
14. 14.True or false: “loose sand dunes” suits tracks. (a) True (b) False
15. 15.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
16. 16.🧭 A robot faces east. It does: turn left, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
17. 17.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) the same direction (d) they do not turn
18. 18.🧭 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 right 135°, then right 45°. What does the gyro read now (0° to 359°)?
19. 19.📡 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
20. 20.⚙️ 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
21. 21.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a light sensor (c) a gyro sensor (d) a temperature sensor
22. 22.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
23. 23.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a camera
24. 24.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
25. 25.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
27. 27.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
28. 28.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
30. 30.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the wheel size (d) the top speed
31. 31.🛞 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)? =
32. 32.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
33. 33.🔍 Why do robots need sensors? (a) to know their world (b) to look colourful (c) to be heavier (d) to use more power
34. 34.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 360° (d) 180°
35. 35.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
36. 36.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
37. 37.🧭 A robot should turn right 180°, but its gyro shows it turned 195°. How many degrees must it turn back to the left?
38. 38.True or false: “stepping over wide gaps” suits propellers. (a) False (b) True
39. 39.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
40. 40.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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