Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 629 · 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 light sensor gets the most reflected light from … (a) a black surface (b) a white surface (c) a black line (d) a dark tunnel
2. 2.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
3. 3.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
4. 4.Which of these suits legs? (a) crossing stepping-stones (b) a muddy building site (c) moving under water (d) deep mud
5. 5.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
6. 6.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
7. 7.True or false: to know a button is pressed, use a light sensor. (a) False (b) True
8. 8.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
9. 9.🔍 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
10. 10.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a touch sensor
11. 11.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
14. 14.🧭 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 30°, then right 60°. What does the gyro read now (0° to 359°)?
15. 15.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
16. 16.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
17. 17.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is hot (d) black is loud
18. 18.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
19. 19.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
20. 20.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
21. 21.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) it goes there and back (d) sound is slow
22. 22.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
23. 23.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
24. 24.🧭 A robot faces east. It does: turn right, turn right. Which way does it face now? (a) west (b) south (c) north (d) east
25. 25.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
26. 26.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
27. 27.🧭 A robot should turn right 90°, but its gyro shows it turned 77°. How many degrees must it turn more to the right?
28. 28.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
29. 29.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) turning (rotation) (d) temperature
30. 30.🔍 Which sensor helps a robot stay balanced upright? (a) a distance sensor (b) a gyro sensor (c) a light sensor (d) a touch sensor
31. 31.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
32. 32.⚙️ A 36-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
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 180°. It turns right 135°, then left 135°. What does the gyro read now (0° to 359°)?
34. 34.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
35. 35.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
36. 36.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 50. What is under the sensor? (a) the white floor (b) the black line
37. 37.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🛞 Which way of moving suits this best: “soft snow”? (a) legs (b) propellers (c) wheels (d) tracks

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