Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 91 · 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 light sensor reads below 40 over a black line and above 40 over the white floor. It reads 36. What is under the sensor? (a) the white floor (b) the black line
2. 2.🦾 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 up and left (b) points up and right (c) points straight up (d) points right
3. 3.True or false: “deep mud” suits tracks. (a) False (b) True
4. 4.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
5. 5.⚙️ 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 small driver gear (b) a big driver gear
6. 6.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a cow (c) a snail (d) a bat
8. 8.Which of these suits wheels? (a) crossing stepping-stones (b) a smooth classroom floor (c) loose sand dunes (d) a field of tall boulders
9. 9.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
10. 10.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
11. 11.🧭 A robot should turn right 90°, but its gyro shows it turned 88°. How many degrees must it turn more to the right?
12. 12.🦾 A servo moves from 20° to 160°. How many degrees does it turn?
13. 13.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
14. 14.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
15. 15.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
16. 16.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
17. 17.🧭 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 0°. It turns left 135°, then left 45°, then right 30°. What does the gyro read now (0° to 359°)?
18. 18.🧭 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 0°. It turns left 90°, then right 90°. What does the gyro read now (0° to 359°)?
19. 19.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
21. 21.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
22. 22.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
23. 23.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its circumference (d) its diameter
24. 24.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) an output (d) a gear
25. 25.🧭 A robot faces north. It does: turn around, turn around, turn left. Which way does it face now? (a) west (b) north (c) east (d) south
26. 26.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the battery size (d) the black/white cut-off
27. 27.📡 A robot is 230 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
28. 28.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.⚙️ A motor makes 500 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
30. 30.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
31. 31.🛞 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?
32. 32.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
33. 33.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
34. 34.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
35. 35.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
36. 36.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times louder (d) 3 times bigger
37. 37.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
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) anticlockwise (b) clockwise
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
40. 40.True or false: to measure a turn angle, use a sound sensor. (a) False (b) True

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