Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 675 · 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.Which of these suits tracks? (a) a flat road (b) a hospital corridor (c) moving under water (d) deep mud
2. 2.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) legs (c) tracks (d) wheels
3. 3.🛞 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)?
4. 4.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) teeth (d) tyres
5. 5.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) slower but stronger (d) at the same speed
6. 6.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points right (c) points straight up (d) points left
7. 7.🔍 Which sensor helps a robot know a button is pressed? (a) a gyro sensor (b) a temperature sensor (c) a light sensor (d) a touch sensor
8. 8.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
9. 9.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
10. 10.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a temperature sensor (c) a touch sensor (d) a light sensor
11. 11.📡 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?
12. 12.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
13. 13.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
14. 14.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 360° (d) 90°
15. 15.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
16. 16.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
17. 17.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
18. 18.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
19. 19.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
20. 20.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
21. 21.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
23. 23.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) small (fast, weak) (d) never important
24. 24.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a snail (d) a goldfish
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
26. 26.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
27. 27.🧭 A robot should turn right 45°, but its gyro shows it turned 47°. How many degrees must it turn back to the left?
28. 28.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
29. 29.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) slower but stronger (c) not at all (d) at the same speed
30. 30.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
32. 32.📡 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?
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 20. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
35. 35.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
36. 36.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a camera (c) a light sensor (d) a sound sensor
37. 37.🔍 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
38. 38.🧭 A robot faces west. It does: turn around, turn right, turn right. Which way does it face now? (a) north (b) east (c) south (d) west
39. 39.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
40. 40.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?

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