Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 937 · 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 motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
2. 2.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.True or false: “moving under water” suits tracks. (a) False (b) True
4. 4.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) one up, one down (d) they do not turn
5. 5.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
6. 6.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
7. 7.🧭 A robot should turn right 180°, but its gyro shows it turned 169°. How many degrees must it turn more to the right?
8. 8.🧭 What does a gyro help a robot do? (a) hear claps (b) see colours (c) turn by exact angles (d) smell smoke
9. 9.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 85. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
10. 10.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a gear (d) a servo
11. 11.True or false: to warn if motors get hot, use a touch sensor. (a) True (b) False
12. 12.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
13. 13.🦾 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 straight up (c) points up and right (d) points right
14. 14.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
15. 15.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
16. 16.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
17. 17.🧭 A robot faces west. It does: turn around, turn left. Which way does it face now? (a) west (b) south (c) north (d) east
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
19. 19.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black surface (c) a black line (d) a dark tunnel
20. 20.📡 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)?
21. 21.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
22. 22.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
23. 23.📡 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 21 seconds (in cm)?
24. 24.True or false: “a hospital corridor” suits legs. (a) True (b) False
25. 25.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
26. 26.Which job needs a camera? (a) measure how far a box is (b) start on a hand clap (c) find the brightest spot (d) spot a red ball
27. 27.📡 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?
28. 28.🔍 Which sensor helps a robot know a button is pressed? (a) a sound sensor (b) a distance sensor (c) a light sensor (d) a touch sensor
29. 29.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 34 cm (d) 3 cm
30. 30.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
31. 31.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
32. 32.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
33. 33.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
35. 35.🛞 Which way of moving suits this best: “hovering over a roof”? (a) propellers (b) legs (c) tracks (d) wheels
36. 36.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
37. 37.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
38. 38.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
39. 39.Which of these suits propellers? (a) loose sand dunes (b) crossing stepping-stones (c) hovering over a roof (d) soft snow
40. 40.🧭 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 right 60°, then right 30°. What does the gyro read now (0° to 359°)?

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