Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 778 · 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 makes 200 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
2. 2.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
3. 3.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to know their world (d) to use more power
4. 4.🧭 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 left 90°, then left 45°, then left 135°. What does the gyro read now (0° to 359°)?
5. 5.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
6. 6.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
7. 7.📡 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?
8. 8.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
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 90°. It turns right 30°, then left 45°, then right 30°. What does the gyro read now (0° to 359°)?
10. 10.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a sound sensor (c) a camera (d) a touch sensor
11. 11.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
12. 12.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🦾 A servo moves from 140° to 130°. How many degrees does it turn?
14. 14.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) north (b) east (c) south (d) west
15. 15.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a light sensor (c) a camera (d) a distance sensor
16. 16.🛞 Circumference = π × … (a) speed (b) diameter (c) radius only (d) weight
17. 17.🧭 A robot should turn right 90°, but its gyro shows it turned 82°. How many degrees must it turn more to the right?
18. 18.🧭 A robot faces south. It does: turn left, turn right. Which way does it face now? (a) west (b) east (c) south (d) north
19. 19.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
20. 20.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a snail (c) a cow (d) a goldfish
21. 21.📡 A robot is 200 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
22. 22.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
23. 23.True or false: “a long factory floor” suits wheels. (a) False (b) True
24. 24.🧭 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 30°, then right 45°, then right 135°. What does the gyro read now (0° to 359°)?
25. 25.Which of these suits legs? (a) crossing stepping-stones (b) a muddy building site (c) loose sand dunes (d) a hospital corridor
26. 26.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
27. 27.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
28. 28.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) an input (d) a wheel
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
32. 32.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
33. 33.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
34. 34.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 70. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
37. 37.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 180° (d) 45°
39. 39.Which of these suits propellers? (a) hovering over a roof (b) crossing stepping-stones (c) deep mud (d) a hospital corridor
40. 40.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) wheels (c) tracks (d) legs

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