Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 423 · 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 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) goes straight back (b) spins right on the spot (c) stays still (d) turns left
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points up and left (c) points left (d) points straight up
3. 3.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
5. 5.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
6. 6.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
7. 7.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
8. 8.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a caster wheel (d) a track
9. 9.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
10. 10.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
11. 11.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
13. 13.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
14. 14.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) propellers (c) tracks (d) wheels
15. 15.Which job needs a touch sensor? (a) follow a black line (b) spot a red ball (c) find the brightest spot (d) feel a bump into a wall
16. 16.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
17. 17.🧭 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 45°, then right 45°. What does the gyro read now (0° to 359°)?
18. 18.True or false: to feel a bump into a wall, use a distance sensor. (a) False (b) True
19. 19.🧭 A robot faces east. It does: turn left, turn around, turn left. Which way does it face now? (a) west (b) north (c) south (d) east
20. 20.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
22. 22.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) between the two sensors (d) under the right sensor
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and left (b) points left (c) points up and right (d) points straight up
24. 24.⚙️ A 10-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
25. 25.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns right (b) spins left on the spot (c) turns left (d) stays still
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) teeth (c) pins (d) tyres
28. 28.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) one up, one down (d) in opposite directions
29. 29.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
30. 30.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
31. 31.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
32. 32.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times louder (d) 3 times slower
35. 35.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
38. 38.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
40. 40.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) legs (c) propellers (d) wheels

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