Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 417 · 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 motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
2. 2.🧭 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 right 180°, then right 120°. What does the gyro read now (0° to 359°)?
3. 3.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
4. 4.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.🧭 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 45°, then left 45°, then left 180°. What does the gyro read now (0° to 359°)?
6. 6.⚙️ An 8-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
8. 8.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 7/22 (c) 22 (d) 2/7
9. 9.📡 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)?
10. 10.🦾 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 right (b) points up and left (c) points left (d) points right
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🔢 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
13. 13.🧭 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 180°. It turns right 135°, then right 45°, then right 30°. What does the gyro read now (0° to 359°)?
14. 14.Which of these suits legs? (a) a smooth classroom floor (b) loose sand dunes (c) hovering over a roof (d) crossing stepping-stones
15. 15.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
16. 16.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
17. 17.True or false: to hear a whistle, use a gyro sensor. (a) False (b) True
18. 18.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) number of gears (d) driver teeth
19. 19.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
20. 20.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
21. 21.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
22. 22.Which of these suits wheels? (a) moving under water (b) a hospital corridor (c) a muddy building site (d) stepping over wide gaps
23. 23.📡 Why do we halve the echo’s total path? (a) sound is slow (b) the sensor is half (c) to make it smaller (d) it goes there and back
24. 24.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
25. 25.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
26. 26.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
27. 27.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a gyro sensor (c) a temperature sensor (d) a light sensor
28. 28.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
29. 29.📡 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)?
30. 30.🛞 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
31. 31.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
32. 32.🔍 Which sensor helps a robot measure how far a box is? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a gyro sensor
33. 33.🧭 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 120°, then left 60°, then right 90°. What does the gyro read now (0° to 359°)?
34. 34.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) a wheel (d) an input
35. 35.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
36. 36.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
37. 37.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
38. 38.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
39. 39.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
40. 40.⚙️ 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

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