Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 862 · 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.True or false: “a hospital corridor” suits tracks. (a) True (b) False
2. 2.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
3. 3.🧭 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 90°. It turns left 60°, then left 60°, then right 60°. What does the gyro read now (0° to 359°)?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
5. 5.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) hear claps (d) smell smoke
6. 6.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
8. 8.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
9. 9.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the right sensor (d) under the left sensor
10. 10.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 3 (d) 2
11. 11.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
12. 12.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22/7 (c) 22 (d) 7/22
13. 13.True or false: “a long factory floor” suits wheels. (a) True (b) False
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
15. 15.Which of these suits tracks? (a) deep mud (b) a smooth classroom floor (c) a hospital corridor (d) hovering over a roof
16. 16.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
17. 17.True or false: “a smooth classroom floor” suits tracks. (a) True (b) False
18. 18.🛞 Which way of moving suits this best: “hovering over a roof”? (a) propellers (b) tracks (c) legs (d) wheels
19. 19.Which job needs a light sensor? (a) spot a red ball (b) feel a bump into a wall (c) measure a turn angle (d) find the brightest spot
20. 20.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.📡 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?
22. 22.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
24. 24.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
25. 25.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
26. 26.Which of these suits propellers? (a) flying over a field (b) a long factory floor (c) loose sand dunes (d) a smooth classroom floor
27. 27.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
28. 28.📡 A robot is 110 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
29. 29.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 50
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🧭 A robot faces north. It does: turn right, turn right, turn left. Which way does it face now? (a) west (b) south (c) east (d) north
34. 34.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) propellers (c) tracks (d) legs
36. 36.⚙️ A motor makes 240 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
37. 37.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it uses a sail (d) it stops for ever
38. 38.🧭 A robot should turn right 180°, but its gyro shows it turned 167°. How many degrees must it turn more to the right?
39. 39.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
40. 40.🛞 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)?

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