Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 983 · 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.True or false: “loose sand dunes” suits legs. (a) True (b) False
2. 2.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
3. 3.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
4. 4.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a light sensor
5. 5.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
6. 6.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
7. 7.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
8. 8.🧭 A robot faces south. It does: turn right, turn left, turn right, turn right. Which way does it face now? (a) east (b) west (c) south (d) north
9. 9.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.🧭 A robot faces north. It does: turn right, turn left, turn around. Which way does it face now? (a) north (b) west (c) east (d) south
11. 11.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
12. 12.🛞 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
13. 13.Which job needs a camera? (a) know a button is pressed (b) stay balanced upright (c) measure how far a box is (d) spot a red ball
14. 14.🛞 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 15 times. How far does the robot roll (in cm)?
15. 15.Which of these suits tracks? (a) loose sand dunes (b) a field of tall boulders (c) stepping over wide gaps (d) flying over a field
16. 16.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
17. 17.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.Which of these suits tracks? (a) hovering over a roof (b) a field of tall boulders (c) stepping over wide gaps (d) a muddy building site
19. 19.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 24 seconds (in cm)?
20. 20.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
22. 22.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
24. 24.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
25. 25.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they spin in the air (d) they are shiny
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
27. 27.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) in opposite directions (c) one up, one down (d) they do not turn
28. 28.⚙️ 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
29. 29.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 462 cm?
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 75. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
31. 31.🧭 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 270°. It turns right 60°, then left 60°, then right 45°. What does the gyro read now (0° to 359°)?
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
33. 33.🔍 Which sensor helps a robot start on a hand clap? (a) a gyro sensor (b) a camera (c) a sound sensor (d) a temperature sensor
34. 34.True or false: “deep mud” suits wheels. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 50
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
37. 37.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 180° (d) 360°
38. 38.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) slower (c) faster (d) backwards
39. 39.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) water (d) white
40. 40.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) tracks (c) legs (d) wheels

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