Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 905 · 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 big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster but weaker
2. 2.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
3. 3.Which job needs a gyro sensor? (a) find the brightest spot (b) hear a whistle (c) measure a turn angle (d) feel a bump into a wall
4. 4.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its diameter (d) its weight
5. 5.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
6. 6.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
7. 7.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black soaks up light (c) black is hot (d) black is wet
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
9. 9.🧭 A robot faces south. It does: turn right, turn right, turn left, turn around. Which way does it face now? (a) west (b) north (c) east (d) south
10. 10.⚙️ A motor makes 160 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
11. 11.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) between the two sensors (c) far behind it (d) under the left sensor
12. 12.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
13. 13.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 35 times. How many times does the driven gear turn?
14. 14.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 308 cm?
15. 15.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) legs (c) propellers (d) wheels
17. 17.🧭 A robot should turn right 45°, but its gyro shows it turned 51°. How many degrees must it turn back to the left?
18. 18.Which of these suits wheels? (a) deep mud (b) stepping over wide gaps (c) a hospital corridor (d) moving under water
19. 19.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
20. 20.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
21. 21.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
22. 22.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
23. 23.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
24. 24.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
25. 25.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) nowhere (d) faster
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 20. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
27. 27.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a light sensor (c) a sound sensor (d) a touch sensor
28. 28.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
29. 29.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
31. 31.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.🦾 A servo moves from 80° to 110°. How many degrees does it turn?
33. 33.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
34. 34.🧭 A robot should turn right 45°, but its gyro shows it turned 30°. How many degrees must it turn more to the right?
35. 35.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
36. 36.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points straight up
37. 37.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 2/7 (c) 22/7 (d) 7/22
40. 40.True or false: “moving under water” suits legs. (a) False (b) True

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