Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 757 · 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 small gear drives a big gear. The big gear turns … (a) slower but stronger (b) at the same speed (c) faster and weaker (d) not at all
2. 2.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) one wheel runs faster (d) it jumps
3. 3.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
4. 4.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) propellers (d) tracks
5. 5.🦾 A servo program runs:
   angle = 140
   angle = angle + 30
   angle = angle − 50
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
6. 6.🧭 A robot should turn right 45°, but its gyro shows it turned 55°. How many degrees must it turn back to the left?
7. 7.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 15. What is under the sensor? (a) the black line (b) the white floor
8. 8.Which of these suits legs? (a) hovering over a roof (b) crossing stepping-stones (c) a long factory floor (d) a flat road
9. 9.🛞 Circumference = π × … (a) weight (b) radius only (c) speed (d) diameter
10. 10.🧭 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 60°, then right 60°. What does the gyro read now (0° to 359°)?
11. 11.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
12. 12.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
13. 13.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
15. 15.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
16. 16.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
17. 17.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a camera (c) a temperature sensor (d) a touch sensor
18. 18.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
19. 19.⚙️ A motor makes 20 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?
20. 20.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) wheels (d) tracks
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
23. 23.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 28 times. How many times does the driven gear turn?
24. 24.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
26. 26.📡 A robot is 120 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
27. 27.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 46. What is under the sensor? (a) the white floor (b) the black line
29. 29.Which job needs a touch sensor? (a) stop before a wall (b) start on a hand clap (c) feel a bump into a wall (d) warn if motors get hot
30. 30.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ A motor makes 350 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
32. 32.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
33. 33.🧭 A robot faces south. It does: turn around, turn around. Which way does it face now? (a) east (b) north (c) south (d) west
34. 34.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 19. What is under the sensor? (a) the black line (b) the white floor
35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
36. 36.📡 A robot is 180 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
37. 37.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
38. 38.True or false: to measure how far a box is, use a camera. (a) False (b) True
39. 39.⚙️ A motor makes 100 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
40. 40.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =

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