Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 252 · 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: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
2. 2.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
3. 3.⚙️ 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
4. 4.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
6. 6.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
7. 7.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 2 (d) 1
8. 8.🧭 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 270°. It turns left 90°, then left 60°. What does the gyro read now (0° to 359°)?
9. 9.🛞 Circumference = π × … (a) weight (b) speed (c) radius only (d) diameter
10. 10.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 60
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.📡 A robot is 230 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
14. 14.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) slower but stronger (c) not at all (d) at the same speed
15. 15.True or false: “crossing stepping-stones” suits tracks. (a) False (b) True
16. 16.📡 A robot is 130 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
17. 17.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
18. 18.True or false: to stop before a wall, use a light sensor. (a) True (b) False
19. 19.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
20. 20.🔍 Which sensor helps a robot warn if motors get hot? (a) a light sensor (b) a gyro sensor (c) a temperature sensor (d) a camera
21. 21.Which of these suits propellers? (a) moving under water (b) soft snow (c) a flat road (d) stepping over wide gaps
22. 22.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) between the two sensors (d) under the left sensor
23. 23.🧭 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 right 30°, then left 60°. What does the gyro read now (0° to 359°)?
24. 24.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a camera (c) a temperature sensor (d) a touch sensor
25. 25.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) west (b) north (c) east (d) south
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
27. 27.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
28. 28.🛞 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)?
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
30. 30.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
31. 31.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) tyres (d) teeth
32. 32.Which job needs a distance sensor? (a) hear a whistle (b) stay balanced upright (c) stop before a wall (d) know a button is pressed
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
35. 35.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 2/7 (c) 7/22 (d) 22/7
36. 36.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
38. 38.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
39. 39.Which job needs a temperature sensor? (a) feel a bump into a wall (b) measure a turn angle (c) stop before a wall (d) warn if motors get hot
40. 40.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?

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