Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 379 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
2. 2.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
3. 3.Which of these suits legs? (a) crossing stepping-stones (b) flying over a field (c) a smooth classroom floor (d) a long factory floor
4. 4.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
5. 5.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points right (c) points up and left (d) points up and right
6. 6.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) motor volts (d) number of gears
7. 7.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) legs (c) propellers (d) tracks
8. 8.🔍 Which sensor helps a robot find the brightest spot? (a) a temperature sensor (b) a light sensor (c) a touch sensor (d) a sound sensor
9. 9.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
10. 10.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
11. 11.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
13. 13.🔍 Which sensor helps a robot spot a red ball? (a) a distance sensor (b) a camera (c) a temperature sensor (d) a sound sensor
14. 14.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) under the left sensor (d) between the two sensors
15. 15.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its circumference (c) its radius (d) its diameter
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
17. 17.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 8 seconds (in cm)?
18. 18.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
19. 19.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
20. 20.🧭 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 120°, then right 180°. What does the gyro read now (0° to 359°)?
21. 21.🦾 A servo moves from 60° to 160°. How many degrees does it turn?
22. 22.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 10. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
24. 24.Which of these suits tracks? (a) a flat road (b) a muddy building site (c) hovering over a roof (d) a long factory floor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
26. 26.🔍 Which sensor helps a robot warn if motors get hot? (a) a sound sensor (b) a camera (c) a temperature sensor (d) a touch sensor
27. 27.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 110° to 70°. How many degrees does it turn?
29. 29.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
30. 30.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
31. 31.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
32. 32.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 110 cm?
33. 33.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) wheels (c) legs (d) propellers
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to know their world (d) to use more power
36. 36.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
38. 38.True or false: to feel a bump into a wall, use a gyro sensor. (a) True (b) False
39. 39.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
40. 40.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) temperature (c) sound (d) colour

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