Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 540 · 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 black line (b) the white floor
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 straight up (b) points up and right (c) points up and left (d) points left
3. 3.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 34 cm (c) 1 km (d) 340 cm
4. 4.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
5. 5.⚙️ 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
6. 6.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
8. 8.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
9. 9.🦾 A servo moves from 120° to 90°. How many degrees does it turn?
10. 10.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
11. 11.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
12. 12.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) legs (c) wheels (d) propellers
14. 14.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
15. 15.⚙️ A motor makes 100 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
16. 16.⚙️ A motor makes 100 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?
17. 17.📡 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)?
18. 18.📡 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 21 seconds (in cm)?
19. 19.🔍 Which sensor helps a robot stay balanced upright? (a) a temperature sensor (b) a gyro sensor (c) a camera (d) a light sensor
20. 20.Which job needs a touch sensor? (a) start on a hand clap (b) stop before a wall (c) know a button is pressed (d) measure a turn angle
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 176 cm?
22. 22.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
24. 24.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
25. 25.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) tracks (c) legs (d) propellers
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
27. 27.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) wheels (c) tracks (d) legs
28. 28.🧭 A robot faces west. It does: turn right, turn left, turn around, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
29. 29.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it stops for ever (d) it jumps
30. 30.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
31. 31.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) wheels (c) tracks (d) propellers
32. 32.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
33. 33.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
34. 34.True or false: “soft snow” suits wheels. (a) True (b) False
35. 35.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
36. 36.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
37. 37.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
38. 38.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
39. 39.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
40. 40.⚙️ A 36-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed

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