Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 940 · 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 gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
2. 2.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
3. 3.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) legs (c) propellers (d) tracks
4. 4.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) tracks (c) wheels (d) propellers
5. 5.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) pins (c) tyres (d) teeth
6. 6.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a goldfish (d) a bat
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.Which of these suits legs? (a) a flat road (b) loose sand dunes (c) flying over a field (d) crossing stepping-stones
9. 9.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
10. 10.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
11. 11.True or false: to follow a black line, use a touch sensor. (a) True (b) False
12. 12.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
13. 13.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 23. What is under the sensor? (a) the white floor (b) the black line
14. 14.True or false: “stepping over wide gaps” suits propellers. (a) True (b) False
15. 15.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 90° (d) 360°
16. 16.🦾 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 left (b) points straight up (c) points up and right (d) points right
17. 17.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
18. 18.🔦 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 black line (b) the white floor
19. 19.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points up and right (c) points straight up (d) points right
20. 20.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
23. 23.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 63. What is under the sensor? (a) the white floor (b) the black line
24. 24.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
27. 27.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
28. 28.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
29. 29.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
30. 30.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
31. 31.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is hot (d) black is wet
32. 32.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
33. 33.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 180° (d) 360°
34. 34.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
35. 35.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
36. 36.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
37. 37.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) zero (d) small (fast, weak)
38. 38.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
39. 39.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
40. 40.🧭 A robot should turn right 180°, but its gyro shows it turned 167°. How many degrees must it turn more to the right?

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