Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 129 · 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 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
3. 3.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
6. 6.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a distance sensor (c) a light sensor (d) a gyro sensor
7. 7.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
8. 8.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
9. 9.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
10. 10.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
12. 12.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
13. 13.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
14. 14.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the right sensor (d) under the left sensor
15. 15.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
16. 16.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) fast and easy on floors (d) they look funny
18. 18.📡 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
19. 19.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a goldfish (d) a bat
20. 20.Which job needs a gyro sensor? (a) feel a bump into a wall (b) measure how far a box is (c) measure a turn angle (d) find the brightest spot
21. 21.🔍 Why do robots need sensors? (a) to know their world (b) to be heavier (c) to use more power (d) to look colourful
22. 22.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle + 20
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.📡 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?
24. 24.True or false: to start on a hand clap, use a touch sensor. (a) False (b) True
25. 25.Which job needs a sound sensor? (a) warn if motors get hot (b) follow a black line (c) start on a hand clap (d) measure a turn angle
26. 26.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
28. 28.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) black (d) white
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.🧭 A robot faces south. It does: turn around, turn around. Which way does it face now? (a) south (b) north (c) east (d) west
31. 31.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
32. 32.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
33. 33.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
34. 34.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
35. 35.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
36. 36.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
37. 37.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
38. 38.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black soaks up light (d) black is hot
39. 39.⚙️ A motor makes 240 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
40. 40.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) faster (d) nowhere

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