Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 71 · 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 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) goes straight forward (b) goes straight back (c) turns right (d) spins right on the spot
2. 2.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
3. 3.🔍 Which sensor helps a robot start on a hand clap? (a) a gyro sensor (b) a sound sensor (c) a touch sensor (d) a camera
4. 4.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
5. 5.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a servo (d) a caster wheel
6. 6.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driven gear (c) driver gear (d) idler gear
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
8. 8.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
9. 9.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
10. 10.⚙️ A 30-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
11. 11.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 29. What is under the sensor? (a) the black line (b) the white floor
12. 12.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to be heavier (d) to look colourful
13. 13.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
14. 14.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
16. 16.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
17. 17.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
18. 18.🧭 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 60°, then right 180°. What does the gyro read now (0° to 359°)?
19. 19.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
20. 20.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) wheels (c) legs (d) tracks
21. 21.🧭 A robot spins 15° every second. How many seconds does it take to turn 135°?
22. 22.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
23. 23.Which of these suits propellers? (a) deep mud (b) moving under water (c) loose sand dunes (d) crossing stepping-stones
24. 24.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 45° (d) 180°
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 180°. It turns left 45°, then right 135°, then left 135°. What does the gyro read now (0° to 359°)?
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
27. 27.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 1 km (d) 3 cm
28. 28.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
30. 30.📡 A robot is 220 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 11 seconds (in cm)?
31. 31.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
33. 33.📡 A robot is 170 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)?
34. 34.🦾 A servo moves from 180° to 100°. How many degrees does it turn?
35. 35.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.⚙️ A motor makes 120 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
37. 37.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) turning (rotation) (d) sound
38. 38.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
39. 39.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
40. 40.🧭 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 30°, then right 60°, then left 45°. What does the gyro read now (0° to 359°)?

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