Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 606 · 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.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
2. 2.Which of these suits wheels? (a) stepping over wide gaps (b) a field of tall boulders (c) soft snow (d) a smooth classroom floor
3. 3.True or false: “hovering over a roof” suits tracks. (a) True (b) False
4. 4.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
5. 5.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
6. 6.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
7. 7.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 3 (c) 1 (d) 2
8. 8.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) propellers (c) tracks (d) wheels
9. 9.🧭 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 60°, then left 180°. What does the gyro read now (0° to 359°)?
10. 10.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
11. 11.Which job needs a gyro sensor? (a) follow a black line (b) read a QR code (c) warn if motors get hot (d) measure a turn angle
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
13. 13.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster and weaker
17. 17.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they never tire (c) they are too cheap (d) too fast on floors
18. 18.⬛ The threshold of a light sensor is … (a) the top speed (b) the black/white cut-off (c) the battery size (d) the wheel size
19. 19.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
20. 20.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 72. What is under the sensor? (a) the black line (b) the white floor
21. 21.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
22. 22.🧭 A robot should turn right 90°, but its gyro shows it turned 80°. How many degrees must it turn more to the right?
23. 23.⚙️ 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
24. 24.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a servo (d) a gear
25. 25.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) goes straight forward (b) turns right (c) stays still (d) spins right on the spot
26. 26.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
27. 27.🧭 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 60°, then right 180°. What does the gyro read now (0° to 359°)?
28. 28.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 2/7 (d) 7/22
29. 29.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
30. 30.Which of these suits tracks? (a) a field of tall boulders (b) loose sand dunes (c) hovering over a roof (d) a smooth classroom floor
31. 31.🔦 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
32. 32.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.🧭 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 135°, then left 45°, then left 90°. What does the gyro read now (0° to 359°)?
35. 35.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a touch sensor (c) a sound sensor (d) a distance sensor
37. 37.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
38. 38.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
39. 39.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a touch sensor (c) a gyro sensor (d) a camera
40. 40.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True

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