Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 17 · 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 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
2. 2.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
3. 3.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🧭 A robot faces north. It does: turn around, turn right, turn right, turn left. Which way does it face now? (a) east (b) south (c) north (d) west
5. 5.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
6. 6.🧭 A robot spins 30° every second. How many seconds does it take to turn 60°?
7. 7.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) wheels (c) tracks (d) propellers
8. 8.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
9. 9.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
10. 10.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) backwards (d) slower
11. 11.🧭 A robot faces east. It does: turn right, turn around, turn right, turn around. Which way does it face now? (a) north (b) south (c) west (d) east
12. 12.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
13. 13.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
14. 14.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) tracks (c) propellers (d) legs
15. 15.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
16. 16.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
17. 17.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.Which of these suits wheels? (a) loose sand dunes (b) soft snow (c) deep mud (d) a smooth classroom floor
20. 20.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
22. 22.Which of these suits propellers? (a) a flat road (b) hovering over a roof (c) a muddy building site (d) crossing stepping-stones
23. 23.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
26. 26.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) in opposite directions (d) they do not turn
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
28. 28.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) tracks (c) legs (d) propellers
29. 29.🛞 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)?
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
32. 32.🧭 A robot should turn right 180°, but its gyro shows it turned 175°. How many degrees must it turn more to the right?
33. 33.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) wheels (c) propellers (d) tracks
34. 34.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
35. 35.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
37. 37.True or false: to hear a whistle, use a temperature sensor. (a) False (b) True
38. 38.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
39. 39.📡 A robot is 190 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 22 seconds (in cm)?
40. 40.⚙️ A motor makes 60 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?

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