Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 529 · 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 robot keeps turning right by 45° at a time. How many turns make one full circle?
2. 2.🧭 A robot spins 15° every second. How many seconds does it take to turn 135°?
3. 3.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points up and right (c) points left (d) points up and left
5. 5.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
6. 6.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) a wheel (d) an input
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 15. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
8. 8.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) small (fast, weak) (d) never important
9. 9.🦾 A servo program runs:
   angle = 60
   angle = angle − 10
   angle = angle − 10
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) propellers (c) wheels (d) tracks
13. 13.🧭 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 120°, then left 180°. What does the gyro read now (0° to 359°)?
14. 14.True or false: “a long factory floor” suits legs. (a) False (b) True
15. 15.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a distance sensor (c) a touch sensor (d) a gyro sensor
16. 16.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
17. 17.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
19. 19.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops
20. 20.Which of these suits wheels? (a) crossing stepping-stones (b) flying over a field (c) a field of tall boulders (d) a smooth classroom floor
21. 21.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
22. 22.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
25. 25.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) slower (d) backwards
26. 26.🧭 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 270°. It turns left 180°, then left 90°. What does the gyro read now (0° to 359°)?
27. 27.🛞 Circumference = π × … (a) radius only (b) speed (c) diameter (d) weight
28. 28.Which job needs a gyro sensor? (a) know a button is pressed (b) find the brightest spot (c) stay balanced upright (d) feel a bump into a wall
29. 29.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a sound sensor
30. 30.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: to spot a red ball, use a camera. (a) True (b) False
32. 32.🧭 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 0°. It turns left 135°, then left 30°, then right 180°. What does the gyro read now (0° to 359°)?
33. 33.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a metal door (c) a soft foam cushion (d) a wooden box
34. 34.🛞 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?
35. 35.Which of these suits tracks? (a) a field of tall boulders (b) flying over a field (c) a long factory floor (d) deep mud
36. 36.Which job needs a gyro sensor? (a) start on a hand clap (b) spot a red ball (c) know a button is pressed (d) measure a turn angle
37. 37.🧭 A robot spins 15° every second. How many seconds does it take to turn 90°?
38. 38.⬛ 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
39. 39.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
40. 40.Which of these suits propellers? (a) a hospital corridor (b) crossing stepping-stones (c) a smooth classroom floor (d) moving under water

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