Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 137 · 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 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
2. 2.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
5. 5.🔍 Why do robots need sensors? (a) to look colourful (b) to know their world (c) to be heavier (d) to use more power
6. 6.📡 A robot is 150 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 3 seconds (in cm)?
7. 7.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
9. 9.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
11. 11.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
12. 12.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
13. 13.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) harder to balance (d) they never tire
14. 14.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
15. 15.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
16. 16.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
18. 18.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
19. 19.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) tyre (d) driven gear
20. 20.Which job needs a distance sensor? (a) measure how far a box is (b) warn if motors get hot (c) start on a hand clap (d) spot a red ball
21. 21.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
23. 23.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) in opposite directions (c) one up, one down (d) the same direction
24. 24.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
26. 26.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?
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 left 45°, then left 135°. What does the gyro read now (0° to 359°)?
28. 28.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
29. 29.⬛ 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
30. 30.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) water (d) black
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 30. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
32. 32.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 34. What is under the sensor? (a) the black line (b) the white floor
33. 33.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) propellers (c) tracks (d) wheels
34. 34.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) wheels (c) tracks (d) legs
35. 35.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its circumference (d) its diameter
36. 36.🧭 A robot should turn right 45°, but its gyro shows it turned 30°. How many degrees must it turn more to the right?
37. 37.⚙️ 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
38. 38.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
39. 39.True or false: to hear a whistle, use a camera. (a) True (b) False
40. 40.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?

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