Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 720 · 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 43. What is under the sensor? (a) the black line (b) the white floor
2. 2.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
4. 4.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) one wheel runs faster (d) it uses a sail
5. 5.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
6. 6.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
7. 7.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 10 seconds (in cm)?
9. 9.⚙️ 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 big driver gear (b) a small driver gear
10. 10.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
11. 11.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a gyro sensor
12. 12.Which of these suits propellers? (a) hovering over a roof (b) a muddy building site (c) a flat road (d) a long factory floor
13. 13.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
14. 14.📡 A robot is 180 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 10 seconds (in cm)?
15. 15.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
16. 16.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
17. 17.📡 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)?
18. 18.Which job needs a distance sensor? (a) follow a black line (b) stay balanced upright (c) start on a hand clap (d) stop before a wall
19. 19.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 3 (d) 4
20. 20.⬛ The threshold of a light sensor is … (a) the wheel size (b) the black/white cut-off (c) the top speed (d) the battery size
21. 21.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times bigger (d) 3 times slower
22. 22.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) colour (d) temperature
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
24. 24.True or false: to measure how far a box is, use a distance sensor. (a) True (b) False
25. 25.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
27. 27.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.📡 A robot is 110 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 7 seconds (in cm)?
29. 29.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
30. 30.Which of these suits wheels? (a) loose sand dunes (b) deep mud (c) flying over a field (d) a hospital corridor
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
32. 32.📡 A robot is 220 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
33. 33.🧭 A robot faces north. It does: turn right, turn right, turn around, turn right. Which way does it face now? (a) east (b) north (c) west (d) south
34. 34.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
35. 35.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
36. 36.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
37. 37.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 180° (d) 90°
38. 38.📡 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?
39. 39.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False

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