Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 13 · 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 30 over a black line and above 30 over the white floor. It reads 47. What is under the sensor? (a) the white floor (b) the black line
2. 2.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
4. 4.Which of these suits wheels? (a) a flat road (b) crossing stepping-stones (c) flying over a field (d) deep mud
5. 5.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
6. 6.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
7. 7.📡 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?
8. 8.🛞 Circumference = π × … (a) weight (b) diameter (c) speed (d) radius only
9. 9.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
10. 10.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is loud (d) black is wet
11. 11.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
12. 12.🧭 A robot should turn right 45°, but its gyro shows it turned 52°. How many degrees must it turn back to the left?
13. 13.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
16. 16.📡 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
17. 17.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
18. 18.🧭 How many degrees is a full turn? (a) 360° (b) 90° (c) 100° (d) 180°
19. 19.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
20. 20.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
21. 21.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) wheels (c) propellers (d) legs
22. 22.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) stays still (c) turns right (d) turns left
23. 23.True or false: “a hospital corridor” suits wheels. (a) False (b) True
24. 24.🧭 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 left 30°, then right 135°. What does the gyro read now (0° to 359°)?
25. 25.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
26. 26.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a distance sensor (c) a camera (d) a light sensor
27. 27.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
28. 28.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
31. 31.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) one wheel runs faster (d) it uses a sail
32. 32.📡 A robot is 180 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
33. 33.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
34. 34.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) wheels (c) propellers (d) tracks
35. 35.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
36. 36.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.Which of these suits tracks? (a) a hospital corridor (b) a smooth classroom floor (c) loose sand dunes (d) flying over a field
38. 38.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 46. What is under the sensor? (a) the white floor (b) the black line
39. 39.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to be heavier (d) to know their world
40. 40.Which of these suits wheels? (a) a muddy building site (b) deep mud (c) a hospital corridor (d) hovering over a roof

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