Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 910 · 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.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) between the two sensors (c) under the left sensor (d) under the right sensor
2. 2.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
3. 3.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
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.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
6. 6.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
7. 7.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
9. 9.🧭 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 90°, then right 180°. What does the gyro read now (0° to 359°)?
10. 10.🧭 A robot spins 90° every second. How many seconds does it take to turn 180°?
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
14. 14.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a distance sensor (c) a touch sensor (d) a temperature sensor
15. 15.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) sound is slow (d) it goes there and back
16. 16.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
18. 18.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) propellers (c) legs (d) wheels
19. 19.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
20. 20.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) tracks (d) propellers
21. 21.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) tyre (d) driver gear
22. 22.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
23. 23.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
24. 24.📡 A robot is 270 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 16 seconds (in cm)?
25. 25.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
26. 26.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) water (d) black
27. 27.🧭 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 left 30°, then left 45°. What does the gyro read now (0° to 359°)?
28. 28.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
30. 30.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a camera (c) a distance sensor (d) a gyro sensor
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
32. 32.⚙️ A motor makes 480 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
33. 33.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
34. 34.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
35. 35.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
36. 36.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 17. What is under the sensor? (a) the black line (b) the white floor
37. 37.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
39. 39.🧭 A robot faces south. It does: turn around, turn around. Which way does it face now? (a) north (b) west (c) east (d) south
40. 40.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?

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