Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 909 · 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 light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
2. 2.Which job needs a light sensor? (a) measure how far a box is (b) follow a black line (c) spot a red ball (d) know a button is pressed
3. 3.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
4. 4.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points straight up (b) points left (c) points up and left (d) points right
5. 5.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?
6. 6.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
7. 7.🧭 A robot should turn right 180°, but its gyro shows it turned 176°. How many degrees must it turn more to the right?
8. 8.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) not at all (c) at the same speed (d) slower but stronger
9. 9.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
10. 10.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
13. 13.Which of these suits tracks? (a) loose sand dunes (b) a field of tall boulders (c) stepping over wide gaps (d) a long factory floor
14. 14.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a servo (c) a gear (d) a track
15. 15.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
16. 16.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a gyro sensor
17. 17.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black surface (d) a black line
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
19. 19.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they are shiny (c) they spin in the air (d) they spread the weight
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
21. 21.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) the same direction (d) they do not turn
22. 22.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
23. 23.⬛ The threshold of a light sensor is … (a) the top speed (b) the black/white cut-off (c) the battery size (d) the wheel size
24. 24.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
25. 25.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
28. 28.🔍 Which sensor helps a robot start on a hand clap? (a) a light sensor (b) a camera (c) a gyro sensor (d) a sound sensor
29. 29.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
30. 30.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
31. 31.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
32. 32.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 71. What is under the sensor? (a) the black line (b) the white floor
33. 33.📡 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)?
34. 34.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
35. 35.🧭 A robot faces north. It does: turn left, turn right, turn around, turn around. Which way does it face now? (a) north (b) west (c) south (d) east
36. 36.True or false: “loose sand dunes” suits wheels. (a) False (b) True
37. 37.⚙️ A 20-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
38. 38.🧭 A robot faces north. It does: turn left, turn left, turn left. Which way does it face now? (a) south (b) east (c) north (d) west
39. 39.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
40. 40.🦾 A servo moves from 60° to 40°. How many degrees does it turn?

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