Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 647 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.Which of these suits wheels? (a) crossing stepping-stones (b) deep mud (c) a field of tall boulders (d) a hospital corridor
3. 3.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 16. What is under the sensor? (a) the black line (b) the white floor
4. 4.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
5. 5.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a touch sensor
6. 6.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
7. 7.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they never tire (d) they are too cheap
8. 8.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 2 (d) 3
9. 9.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 61. What is under the sensor? (a) the black line (b) the white floor
10. 10.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 56. What is under the sensor? (a) the white floor (b) the black line
11. 11.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
12. 12.🧭 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 120°, then left 180°, then left 45°. What does the gyro read now (0° to 359°)?
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) spins left on the spot (c) turns left (d) turns right
14. 14.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) temperature (c) colour (d) sound
15. 15.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) slower but stronger (c) faster and weaker (d) not at all
16. 16.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its radius (d) its weight
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
18. 18.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
19. 19.Which job needs a camera? (a) stay balanced upright (b) feel a bump into a wall (c) measure how far a box is (d) read a QR code
20. 20.🧭 What does a gyro help a robot do? (a) hear claps (b) turn by exact angles (c) smell smoke (d) see colours
21. 21.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
24. 24.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 11. What is under the sensor? (a) the black line (b) the white floor
28. 28.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
29. 29.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
30. 30.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) driven gear (d) tyre
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
32. 32.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
34. 34.🔢 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
35. 35.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a gyro sensor
36. 36.🧭 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 120°, then right 180°. What does the gyro read now (0° to 359°)?
37. 37.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
38. 38.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black is loud (d) black soaks up light
39. 39.🧭 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 45°, then left 45°. What does the gyro read now (0° to 359°)?
40. 40.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor

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