Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 790 · 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 stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
2. 2.Which job needs a camera? (a) stay balanced upright (b) spot a red ball (c) know a button is pressed (d) stop before a wall
3. 3.⚙️ 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
4. 4.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
5. 5.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 360° (d) 90°
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 85. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
7. 7.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
8. 8.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
9. 9.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
10. 10.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
11. 11.🦾 A servo moves from 70° to 140°. How many degrees does it turn?
12. 12.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) propellers (c) legs (d) tracks
13. 13.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a temperature sensor (c) a gyro sensor (d) a light sensor
19. 19.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
20. 20.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to use more power (d) to know their world
21. 21.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
22. 22.True or false: “a flat road” suits wheels. (a) False (b) True
23. 23.🧭 A robot faces east. It does: turn right, turn around. Which way does it face now? (a) east (b) south (c) north (d) west
24. 24.🔍 What does a gyro sensor measure? (a) sound (b) temperature (c) turning (rotation) (d) colour
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
27. 27.🧭 A robot should turn right 180°, but its gyro shows it turned 165°. How many degrees must it turn more to the right?
28. 28.Which job needs a touch sensor? (a) start on a hand clap (b) stop before a wall (c) measure a turn angle (d) feel a bump into a wall
29. 29.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
30. 30.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
31. 31.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
32. 32.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
34. 34.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points right (c) points left (d) points straight up
35. 35.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
36. 36.True or false: to hear a whistle, use a distance sensor. (a) False (b) True
37. 37.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
38. 38.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 360° (d) 180°
39. 39.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
40. 40.🛞 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) spins left on the spot (b) stays still (c) goes straight forward (d) spins right on the spot

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