Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 234 · 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.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
2. 2.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
3. 3.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) tracks (d) propellers
4. 4.True or false: to measure how far a box is, use a light sensor. (a) True (b) False
5. 5.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
6. 6.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is hot (d) black is loud
7. 7.True or false: “flying over a field” suits tracks. (a) False (b) True
8. 8.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
10. 10.⚙️ A motor makes 250 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
11. 11.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a flat wall (c) a soft foam cushion (d) a wooden box
12. 12.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
13. 13.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
14. 14.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
15. 15.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
16. 16.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
17. 17.Which of these suits wheels? (a) deep mud (b) loose sand dunes (c) a flat road (d) soft snow
18. 18.📡 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?
19. 19.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
20. 20.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.Which of these suits tracks? (a) a hospital corridor (b) a smooth classroom floor (c) crossing stepping-stones (d) soft snow
22. 22.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
23. 23.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 990 cm?
24. 24.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
25. 25.🔍 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
26. 26.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a servo (c) a caster wheel (d) a gear
27. 27.🧭 What does a gyro help a robot do? (a) smell smoke (b) hear claps (c) see colours (d) turn by exact angles
28. 28.🧭 A robot faces south. It does: turn around, turn right. Which way does it face now? (a) south (b) west (c) east (d) north
29. 29.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to be heavier (d) to look colourful
30. 30.🧭 A robot spins 30° every second. How many seconds does it take to turn 60°?
31. 31.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) far behind it (d) under the right sensor
32. 32.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they look funny (d) they climb stairs
33. 33.🔍 Which sensor helps a robot measure a turn angle? (a) a touch sensor (b) a light sensor (c) a temperature sensor (d) a gyro sensor
34. 34.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
35. 35.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
36. 36.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
38. 38.🧭 A robot should turn right 180°, but its gyro shows it turned 177°. How many degrees must it turn more to the right?
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
40. 40.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =

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