Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 799 · 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.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) sound is slow (c) it goes there and back (d) the sensor is half
2. 2.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
3. 3.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 27 times. How many times does the driven gear turn?
4. 4.True or false: “a field of tall boulders” suits propellers. (a) False (b) True
5. 5.True or false: “soft snow” suits legs. (a) False (b) True
6. 6.🛞 Circumference = π × … (a) speed (b) radius only (c) diameter (d) weight
7. 7.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
9. 9.🧭 A robot spins 30° every second. How many seconds does it take to turn 240°?
10. 10.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) wheels (c) propellers (d) legs
11. 11.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a temperature sensor (c) a sound sensor (d) a touch sensor
12. 12.🔍 Which sensor helps a robot follow a black line? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a touch sensor
13. 13.🧭 A robot should turn right 180°, but its gyro shows it turned 170°. How many degrees must it turn more to the right?
14. 14.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
16. 16.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
17. 17.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
18. 18.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
19. 19.⚙️ 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 small driver gear (b) a big driver gear
20. 20.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 340 cm (d) 3 cm
21. 21.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
22. 22.🧭 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 180°, then right 60°. What does the gyro read now (0° to 359°)?
23. 23.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
24. 24.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
25. 25.⚙️ An 8-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) faster (c) slower
26. 26.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
28. 28.🧭 A robot spins 15° every second. How many seconds does it take to turn 330°?
29. 29.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
30. 30.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) in opposite directions (d) the same direction
31. 31.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
33. 33.🧭 A robot should turn right 45°, but its gyro shows it turned 34°. How many degrees must it turn more to the right?
34. 34.🔍 Which sensor helps a robot warn if motors get hot? (a) a gyro sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
35. 35.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 34. What is under the sensor? (a) the black line (b) the white floor
36. 36.⚙️ A 20-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
37. 37.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
38. 38.⚙️ A motor makes 240 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
39. 39.🧭 A robot should turn right 45°, but its gyro shows it turned 47°. How many degrees must it turn back to the left?
40. 40.🔍 Which sensor helps a robot read a QR code? (a) a gyro sensor (b) a light sensor (c) a sound sensor (d) a camera

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