Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 122 · 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 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
3. 3.📡 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?
4. 4.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its weight (d) its diameter
5. 5.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a white surface (d) a black surface
6. 6.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
7. 7.🧭 A robot faces south. It does: turn left, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
8. 8.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
9. 9.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
10. 10.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
11. 11.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
12. 12.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
14. 14.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) hear claps (d) turn by exact angles
15. 15.🧭 A robot spins 60° every second. How many seconds does it take to turn 300°?
16. 16.🧭 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 left 135°. What does the gyro read now (0° to 359°)?
17. 17.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a gyro sensor (c) a light sensor (d) a touch sensor
18. 18.True or false: to start on a hand clap, use a sound sensor. (a) True (b) False
19. 19.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 45° (d) 180°
20. 20.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) teeth (d) spokes
21. 21.True or false: to follow a black line, use a light sensor. (a) False (b) True
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
24. 24.🧭 A robot faces north. It does: turn around, turn around, turn right, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
25. 25.🧭 A robot should turn right 180°, but its gyro shows it turned 169°. How many degrees must it turn more to the right?
26. 26.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
27. 27.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 360° (d) 100°
28. 28.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
29. 29.⚙️ A 36-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
30. 30.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
31. 31.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
32. 32.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
33. 33.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
34. 34.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
36. 36.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 95. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
38. 38.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 3 cm (d) 340 cm
39. 39.True or false: “deep mud” suits wheels. (a) False (b) True
40. 40.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points up and left

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