Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 49 · 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 70 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
2. 2.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
3. 3.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
4. 4.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they are too cheap (d) they never tire
5. 5.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
6. 6.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 78. What is under the sensor? (a) the black line (b) the white floor
7. 7.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
9. 9.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 360° (d) 90°
10. 10.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
12. 12.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) in opposite directions (c) they do not turn (d) one up, one down
13. 13.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
14. 14.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 50
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
16. 16.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 1 km (d) 3 cm
18. 18.Which job needs a sound sensor? (a) spot a red ball (b) know a button is pressed (c) start on a hand clap (d) stop before a wall
19. 19.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
20. 20.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
22. 22.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
23. 23.🔍 Which sensor helps a robot measure how far a box is? (a) a temperature sensor (b) a touch sensor (c) a gyro sensor (d) a distance sensor
24. 24.🦾 A servo moves from 50° to 100°. How many degrees does it turn?
25. 25.📡 A robot is 240 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
26. 26.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) fast and easy on floors (d) they float
27. 27.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) an output (d) a wheel
28. 28.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
29. 29.🛞 Which way of moving suits this best: “a muddy building site”? (a) tracks (b) propellers (c) legs (d) wheels
30. 30.🛞 Which way of moving suits this best: “moving under water”? (a) propellers (b) wheels (c) tracks (d) legs
31. 31.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a track (c) a gear (d) a servo
32. 32.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
33. 33.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.⚙️ A motor makes 360 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?
36. 36.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) tracks (c) propellers (d) wheels
37. 37.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
38. 38.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1188 cm?
39. 39.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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