Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 376 · 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: “stepping over wide gaps” suits wheels. (a) True (b) False
2. 2.📡 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?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
6. 6.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points up and right (c) points straight up (d) points left
7. 7.Which job needs a camera? (a) feel a bump into a wall (b) spot a red ball (c) stop before a wall (d) hear a whistle
8. 8.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 75. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
11. 11.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
12. 12.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle − 10
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
14. 14.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) black (d) water
15. 15.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) legs (c) tracks (d) propellers
16. 16.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
17. 17.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they are too cheap (c) they never tire (d) too fast on floors
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 35. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
19. 19.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
20. 20.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
21. 21.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
22. 22.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
23. 23.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
25. 25.📡 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?
26. 26.🧭 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 left 135°, then right 45°, then right 180°. What does the gyro read now (0° to 359°)?
27. 27.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
28. 28.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) colour (c) sound (d) temperature
29. 29.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
30. 30.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a camera (c) a touch sensor (d) a distance sensor
31. 31.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a metal door (d) a soft foam cushion
32. 32.Which job needs a temperature sensor? (a) measure how far a box is (b) follow a black line (c) warn if motors get hot (d) start on a hand clap
33. 33.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
34. 34.📡 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?
35. 35.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
36. 36.True or false: “loose sand dunes” suits legs. (a) False (b) True
37. 37.Which of these suits propellers? (a) soft snow (b) a smooth classroom floor (c) hovering over a roof (d) a hospital corridor
38. 38.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a temperature sensor (c) a touch sensor (d) a gyro sensor
39. 39.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 22 (d) 7/22
40. 40.Which of these suits tracks? (a) hovering over a roof (b) soft snow (c) moving under water (d) flying over a field

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