Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 397 · 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.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) legs (c) propellers (d) wheels
2. 2.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
3. 3.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
4. 4.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
5. 5.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black is wet (d) black soaks up light
6. 6.⚙️ 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 big driver gear (b) a small driver gear
7. 7.🧭 A robot faces west. It does: turn left, turn left, turn around. Which way does it face now? (a) north (b) west (c) east (d) south
8. 8.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a touch sensor (c) a light sensor (d) a camera
9. 9.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
10. 10.🔍 Why do robots need sensors? (a) to use more power (b) to know their world (c) to be heavier (d) to look colourful
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
12. 12.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
13. 13.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
14. 14.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
15. 15.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) it goes there and back (d) to make it smaller
16. 16.🔍 Which sensor helps a robot spot a red ball? (a) a camera (b) a temperature sensor (c) a sound sensor (d) a distance sensor
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 70. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
18. 18.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
19. 19.📡 A robot is 230 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 16 seconds (in cm)?
20. 20.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
21. 21.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) an output (d) a wheel
22. 22.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
23. 23.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) wheels (c) propellers (d) legs
24. 24.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 34 cm (d) 3 cm
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
28. 28.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
29. 29.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
30. 30.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
31. 31.🧭 A robot faces west. It does: turn around, turn right, turn right, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
32. 32.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) big (slow and strong) (c) zero (d) never important
33. 33.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 43. What is under the sensor? (a) the black line (b) the white floor
34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
35. 35.🧭 A robot faces south. It does: turn around, turn around, turn around, turn left. Which way does it face now? (a) west (b) north (c) south (d) east
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
39. 39.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) the same direction (d) one up, one down
40. 40.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall

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