Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 390 · 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.True or false: to measure how far a box is, use a sound sensor. (a) True (b) False
2. 2.⚙️ 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
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 90. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
4. 4.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
5. 5.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
6. 6.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
7. 7.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
8. 8.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a gyro sensor (d) a sound sensor
10. 10.🧭 A robot should turn right 180°, but its gyro shows it turned 187°. How many degrees must it turn back to the left?
11. 11.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
12. 12.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
13. 13.📡 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 8 seconds (in cm)?
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
15. 15.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
17. 17.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) tracks (c) propellers (d) wheels
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
19. 19.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
20. 20.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
21. 21.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
22. 22.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 7/22 (d) 2/7
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
24. 24.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
25. 25.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a metal door (c) a wooden box (d) a soft foam cushion
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.📡 A robot is 120 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 6 seconds (in cm)?
28. 28.🔍 Which sensor helps a robot stay balanced upright? (a) a light sensor (b) a temperature sensor (c) a gyro sensor (d) a distance sensor
29. 29.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 3 (c) 4 (d) 2
30. 30.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
31. 31.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) black (d) the sky
33. 33.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
34. 34.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
35. 35.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) big (slow and strong) (d) small (fast, weak)
36. 36.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
37. 37.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
38. 38.🧭 A robot faces north. It does: turn around, turn right, turn around, turn right. Which way does it face now? (a) east (b) west (c) south (d) north
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times louder (d) 3 times bigger

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