Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 398 · 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.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a gyro sensor (c) a distance sensor (d) a camera
2. 2.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
3. 3.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
4. 4.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a track (c) a gear (d) a servo
5. 5.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
6. 6.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
8. 8.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.🛞 Circumference = π × … (a) speed (b) weight (c) radius only (d) diameter
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
11. 11.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a light sensor (c) a distance sensor (d) a touch sensor
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
13. 13.⚙️ An 8-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) slower (c) faster
14. 14.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
16. 16.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight back (b) stays still (c) spins right on the spot (d) goes straight forward
17. 17.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
19. 19.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 360° (c) 45° (d) 90°
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
23. 23.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) stays still (b) turns left (c) turns right (d) goes straight forward
24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
26. 26.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) never important (d) small (fast, weak)
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) turns right (c) spins right on the spot (d) turns left
29. 29.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
30. 30.True or false: to stay balanced upright, use a touch sensor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 10
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) wheels (c) propellers (d) tracks
33. 33.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
34. 34.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
35. 35.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
36. 36.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
38. 38.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
39. 39.Which job needs a touch sensor? (a) start on a hand clap (b) feel a bump into a wall (c) stop before a wall (d) find the brightest spot
40. 40.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?

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