Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 870 · 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 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
2. 2.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
3. 3.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times slower (d) 3 times bigger
4. 4.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) water drops (c) sound too high to hear (d) bright light
5. 5.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 1 (d) 4
6. 6.⚙️ A motor makes 350 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
7. 7.⚙️ 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
8. 8.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
9. 9.📡 A robot is 150 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 11 seconds (in cm)?
10. 10.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
11. 11.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
13. 13.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to be heavier (d) to know their world
14. 14.🧭 A robot faces west. It does: turn right, turn left. Which way does it face now? (a) west (b) north (c) east (d) south
15. 15.Which job needs a light sensor? (a) know a button is pressed (b) warn if motors get hot (c) follow a black line (d) measure a turn angle
16. 16.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
17. 17.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
18. 18.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a touch sensor (c) a temperature sensor (d) a sound sensor
19. 19.🧭 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 90°. It turns right 90°, then right 90°. What does the gyro read now (0° to 359°)?
20. 20.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
21. 21.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
22. 22.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
23. 23.🦾 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 up and left (b) points left (c) points straight up (d) points right
24. 24.📡 A robot is 260 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 15 seconds (in cm)?
25. 25.🧭 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 left 90°, then left 120°. What does the gyro read now (0° to 359°)?
26. 26.🧭 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 30°, then right 120°. What does the gyro read now (0° to 359°)?
27. 27.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
29. 29.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
30. 30.Which job needs a distance sensor? (a) spot a red ball (b) measure how far a box is (c) measure a turn angle (d) hear a whistle
31. 31.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a sound sensor (c) a gyro sensor (d) a touch sensor
32. 32.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) spins left on the spot (c) spins right on the spot (d) goes straight back
33. 33.True or false: “a hospital corridor” suits tracks. (a) False (b) True
34. 34.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a temperature sensor (c) a light sensor (d) a camera
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) turns right (b) stays still (c) goes straight back (d) turns left
38. 38.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster and weaker
39. 39.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
40. 40.True or false: to stop before a wall, use a distance sensor. (a) False (b) True

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