Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 43 · 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.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
2. 2.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the battery size (d) the top speed
3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
4. 4.⚙️ 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
5. 5.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
6. 6.Which job needs a temperature sensor? (a) warn if motors get hot (b) follow a black line (c) measure a turn angle (d) read a QR code
7. 7.True or false: to follow a black line, use a touch sensor. (a) True (b) False
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
9. 9.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
10. 10.Which job needs a gyro sensor? (a) warn if motors get hot (b) feel a bump into a wall (c) hear a whistle (d) measure a turn angle
11. 11.⚙️ A motor makes 240 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
12. 12.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to look colourful (d) to use more power
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.True or false: to measure a turn angle, use a touch sensor. (a) False (b) True
15. 15.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
16. 16.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
17. 17.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) turns right (b) spins left on the spot (c) goes straight forward (d) stays still
18. 18.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
19. 19.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
20. 20.🛞 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) goes straight forward (b) curves to the left (c) curves to the right
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
22. 22.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
24. 24.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
25. 25.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 60
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.🧭 A robot faces south. It does: turn left, turn left. Which way does it face now? (a) west (b) south (c) east (d) north
27. 27.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
28. 28.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
29. 29.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
30. 30.🛞 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) goes straight forward (b) spins left on the spot (c) turns left (d) turns right
31. 31.📡 A robot is 200 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 11 seconds (in cm)?
32. 32.🦾 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 left (b) points up and right (c) points up and left (d) points straight up
33. 33.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a metal door (d) a soft foam cushion
34. 34.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
37. 37.⚙️ A motor makes 50 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
40. 40.📡 A robot is 230 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?

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