Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 198 · 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: “has just two wires” is true of a DC motor. (a) False (b) True
2. 2.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
3. 3.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) north (b) east (c) west (d) south
5. 5.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
6. 6.📡 A robot is 110 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
7. 7.True or false: to follow a black line, use a light sensor. (a) False (b) True
8. 8.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
9. 9.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
10. 10.True or false: “flying over a field” suits propellers. (a) True (b) False
11. 11.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
12. 12.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the right sensor (c) far behind it (d) under the left sensor
13. 13.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) propellers (c) tracks (d) wheels
14. 14.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a cow (d) a snail
15. 15.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
16. 16.⚙️ 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
17. 17.🦾 A servo moves from 10° to 180°. How many degrees does it turn?
18. 18.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
19. 19.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 4 (d) 3
20. 20.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
21. 21.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a track (c) a caster wheel (d) a servo
22. 22.⚙️ A 10-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
23. 23.🛞 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) turns left (b) spins left on the spot (c) goes straight forward (d) goes straight back
24. 24.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 3 cm (c) 340 cm (d) 1 km
25. 25.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a wooden box (c) a soft foam cushion (d) a flat wall
26. 26.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times louder (d) 3 times slower
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) big (slow and strong) (c) never important (d) zero
28. 28.⚙️ A 16-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
29. 29.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
30. 30.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
31. 31.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
32. 32.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
33. 33.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) wheels (c) legs (d) propellers
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
36. 36.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) tracks (c) propellers (d) legs
37. 37.Which of these suits wheels? (a) deep mud (b) hovering over a roof (c) a long factory floor (d) crossing stepping-stones
38. 38.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
39. 39.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor

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