Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 224 · 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 servo program runs:
   angle = 140
   angle = angle − 60
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) goes straight forward (c) spins right on the spot (d) turns right
3. 3.🧭 A robot should turn right 90°, but its gyro shows it turned 94°. How many degrees must it turn back to the left?
4. 4.🦾 A servo moves from 60° to 160°. How many degrees does it turn?
5. 5.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) too fast on floors (d) harder to balance
6. 6.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a wooden box (d) a metal door
7. 7.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
9. 9.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a touch sensor (c) a camera (d) a gyro sensor
10. 10.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
11. 11.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to know their world (d) to use more power
12. 12.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
13. 13.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a temperature sensor (c) a gyro sensor (d) a light sensor
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
16. 16.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.True or false: “a hospital corridor” suits tracks. (a) False (b) True
18. 18.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
19. 19.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
20. 20.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
21. 21.True or false: “deep mud” suits tracks. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.🦾 A servo moves from 100° to 140°. How many degrees does it turn?
24. 24.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
25. 25.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
26. 26.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 45° (d) 180°
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
28. 28.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 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
30. 30.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a gyro sensor (c) a sound sensor (d) a camera
31. 31.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
32. 32.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
33. 33.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns right (b) goes straight back (c) turns left (d) spins right on the spot
34. 34.True or false: “loose sand dunes” suits tracks. (a) True (b) False
35. 35.🧭 A robot faces south. It does: turn right, turn left, turn around, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
36. 36.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black is loud (d) black soaks up light
40. 40.🧭 A robot faces south. It does: turn right, turn around. Which way does it face now? (a) south (b) north (c) east (d) west

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