Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 154 · 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: to stay balanced upright, use a gyro sensor. (a) False (b) True
2. 2.🧭 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 right 30°, then left 60°. What does the gyro read now (0° to 359°)?
3. 3.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 360° (d) 180°
4. 4.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
5. 5.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a white surface (d) a dark tunnel
6. 6.🧭 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 right 90°, then right 30°, then right 120°. What does the gyro read now (0° to 359°)?
7. 7.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
9. 9.🧭 A robot faces north. It does: turn around, turn around, turn left, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
10. 10.🧭 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 120°, then left 135°, then right 120°. What does the gyro read now (0° to 359°)?
11. 11.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
14. 14.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
17. 17.True or false: “a long factory floor” suits wheels. (a) False (b) True
18. 18.🔍 Which sensor helps a robot start on a hand clap? (a) a camera (b) a touch sensor (c) a light sensor (d) a sound sensor
19. 19.⚙️ A motor makes 100 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
20. 20.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
21. 21.Which of these suits propellers? (a) a flat road (b) stepping over wide gaps (c) flying over a field (d) crossing stepping-stones
22. 22.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
23. 23.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
24. 24.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
25. 25.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False
26. 26.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times bigger (d) 3 times louder
27. 27.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 616 cm?
28. 28.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🧭 A robot faces north. It does: turn right, turn around, turn left, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
30. 30.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
31. 31.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 34 cm (d) 1 km
32. 32.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
33. 33.🧭 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 90°, then left 60°, then left 90°. What does the gyro read now (0° to 359°)?
34. 34.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
35. 35.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) nowhere (d) backwards
36. 36.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) black (d) water
37. 37.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
38. 38.🧭 A robot should turn right 180°, but its gyro shows it turned 185°. How many degrees must it turn back to the left?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.Which of these suits tracks? (a) hovering over a roof (b) a smooth classroom floor (c) a muddy building site (d) a field of tall boulders

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