Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 957 · 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.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) hear claps (d) smell smoke
2. 2.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
3. 3.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🦾 A servo program runs:
   angle = 150
   angle = angle − 10
   angle = angle − 20
   angle = angle + 50
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
5. 5.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
6. 6.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
7. 7.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
8. 8.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a track (c) a gear (d) a caster wheel
9. 9.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster but weaker
10. 10.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) tracks (d) wheels
11. 11.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
12. 12.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
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 right 135°, then right 30°. What does the gyro read now (0° to 359°)?
14. 14.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
15. 15.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
16. 16.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
17. 17.🧭 How many degrees is a full turn? (a) 360° (b) 90° (c) 100° (d) 180°
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
19. 19.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a touch sensor (c) a camera (d) a gyro sensor
20. 20.🧭 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 45°, then left 90°, then right 30°. What does the gyro read now (0° to 359°)?
21. 21.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 60. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
24. 24.🧭 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 right 30°, then right 180°. What does the gyro read now (0° to 359°)?
25. 25.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
29. 29.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
30. 30.🧭 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 left 45°, then right 60°. What does the gyro read now (0° to 359°)?
31. 31.⚙️ A 12-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
32. 32.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 40
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
34. 34.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
35. 35.🧭 A robot should turn right 90°, but its gyro shows it turned 86°. How many degrees must it turn more to the right?
36. 36.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
37. 37.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times louder (d) 3 times slower
38. 38.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
39. 39.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
40. 40.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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