Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 620 · 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 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
2. 2.🦾 A servo program runs:
   angle = 180
   angle = angle − 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
5. 5.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
6. 6.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
7. 7.True or false: to find the brightest spot, use a camera. (a) False (b) True
8. 8.🧭 A robot faces south. It does: turn around, turn right, turn around. Which way does it face now? (a) north (b) south (c) west (d) east
9. 9.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
10. 10.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) driver gear (d) tyre
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the top speed (d) the wheel size
13. 13.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
14. 14.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
15. 15.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
17. 17.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to know their world (d) to be heavier
18. 18.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
19. 19.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
20. 20.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
21. 21.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) faster and weaker (d) at the same speed
22. 22.True or false: to start on a hand clap, use a camera. (a) True (b) False
23. 23.📡 A robot is 230 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 24 seconds (in cm)?
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
26. 26.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
27. 27.🔍 Which sensor helps a robot know a button is pressed? (a) a sound sensor (b) a light sensor (c) a camera (d) a touch sensor
28. 28.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
30. 30.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
31. 31.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.🦾 A servo moves from 70° to 60°. How many degrees does it turn?
33. 33.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) faster but weaker (c) not at all (d) slower but stronger
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
36. 36.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a caster wheel (c) a gear (d) a track
37. 37.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 81. What is under the sensor? (a) the black line (b) the white floor
38. 38.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 1 (d) 2
39. 39.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a white surface (d) a dark tunnel
40. 40.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) wheels (c) legs (d) tracks

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