Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 838 · 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 robot faces east. It does: turn right, turn around, turn right, turn right. Which way does it face now? (a) north (b) south (c) east (d) west
2. 2.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a distance sensor (c) a touch sensor (d) a light sensor
3. 3.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) legs (c) propellers (d) wheels
4. 4.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
5. 5.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
6. 6.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
7. 7.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.⚙️ A 36-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
9. 9.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 180° (c) 45° (d) 90°
10. 10.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) wheels (c) tracks (d) legs
11. 11.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black soaks up light (c) black is wet (d) black is hot
13. 13.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its circumference (c) its diameter (d) its radius
14. 14.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) tracks (c) legs (d) propellers
15. 15.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
16. 16.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
17. 17.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times slower (d) 3 times louder
18. 18.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
19. 19.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 45° (d) 180°
20. 20.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
22. 22.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22/7 (d) 22
23. 23.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
24. 24.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an input (d) an output
25. 25.🧭 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 right 135°, then right 45°, then left 30°. What does the gyro read now (0° to 359°)?
26. 26.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
27. 27.True or false: “flying over a field” suits propellers. (a) True (b) False
28. 28.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a sound sensor (c) a camera (d) a gyro sensor
29. 29.⚙️ A motor makes 480 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
30. 30.🧭 A robot should turn right 90°, but its gyro shows it turned 97°. How many degrees must it turn back to the left?
31. 31.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) tyre (c) driver gear (d) driven gear
32. 32.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they are round (d) they spin in the air
33. 33.⚙️ A motor makes 360 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
34. 34.🔍 What does a gyro sensor measure? (a) sound (b) colour (c) temperature (d) turning (rotation)
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 20
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
37. 37.True or false: to stop before a wall, use a sound sensor. (a) True (b) False
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.📡 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)?
40. 40.⚙️ A motor makes 480 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?

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