Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 616 · 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.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a sound sensor (c) a light sensor (d) a camera
2. 2.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) small (fast, weak) (d) never important
3. 3.Which of these suits wheels? (a) loose sand dunes (b) crossing stepping-stones (c) a long factory floor (d) stepping over wide gaps
4. 4.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
5. 5.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black is hot (d) black soaks up light
6. 6.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) propellers (c) wheels (d) tracks
8. 8.Which job needs a light sensor? (a) measure how far a box is (b) measure a turn angle (c) stay balanced upright (d) find the brightest spot
9. 9.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a white surface (c) a dark tunnel (d) a black surface
10. 10.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
11. 11.📡 A robot is 190 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
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 sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
14. 14.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) east (b) west (c) north (d) south
15. 15.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
17. 17.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) tracks (c) wheels (d) legs
18. 18.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
19. 19.Which job needs a gyro sensor? (a) know a button is pressed (b) measure how far a box is (c) warn if motors get hot (d) stay balanced upright
20. 20.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) in opposite directions (d) they do not turn
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
22. 22.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.Which of these suits wheels? (a) stepping over wide gaps (b) a smooth classroom floor (c) a field of tall boulders (d) loose sand dunes
24. 24.🧭 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 left 135°, then right 90°. What does the gyro read now (0° to 359°)?
25. 25.🧭 A robot spins 15° every second. How many seconds does it take to turn 120°?
26. 26.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
27. 27.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
28. 28.🔍 What does a gyro sensor measure? (a) turning (rotation) (b) sound (c) temperature (d) colour
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
30. 30.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ A motor makes 100 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?
32. 32.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) turns right (c) spins right on the spot (d) turns left
33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
37. 37.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
38. 38.🧭 A robot faces north. It does: turn right, turn around, turn right, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
39. 39.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
40. 40.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?

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