Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 993 · 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.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
2. 2.🛞 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)?
3. 3.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
4. 4.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 51. What is under the sensor? (a) the black line (b) the white floor
5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
6. 6.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) wheels (c) tracks (d) propellers
7. 7.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is hot (d) black is loud
8. 8.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
9. 9.Which of these suits wheels? (a) loose sand dunes (b) a flat road (c) deep mud (d) flying over a field
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
11. 11.🧭 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 180°. It turns left 120°, then left 45°, then right 30°. What does the gyro read now (0° to 359°)?
12. 12.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) propellers (c) tracks (d) wheels
13. 13.⚙️ A motor makes 140 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
14. 14.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
15. 15.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
17. 17.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a metal door (c) a wooden box (d) a flat wall
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
19. 19.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) tracks (c) wheels (d) propellers
20. 20.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
21. 21.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky
22. 22.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) turn by exact angles (d) hear claps
23. 23.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
24. 24.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 63. What is under the sensor? (a) the white floor (b) the black line
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
26. 26.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
27. 27.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
28. 28.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
29. 29.🔢 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
30. 30.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it jumps (c) it uses a sail (d) it stops for ever
31. 31.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
32. 32.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster but weaker
33. 33.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
34. 34.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.📡 A robot is 220 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
36. 36.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 360° (d) 90°
37. 37.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
38. 38.📡 A robot is 120 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)?
39. 39.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
40. 40.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km

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