Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 88 · 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 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
2. 2.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
5. 5.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a gyro sensor (c) a camera (d) a sound sensor
6. 6.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) legs (c) propellers (d) wheels
7. 7.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.🦾 A servo program runs:
   angle = 60
   angle = angle − 10
   angle = angle + 60
   angle = angle − 60
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
9. 9.🧭 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 90°. It turns left 180°, then right 135°, then right 60°. What does the gyro read now (0° to 359°)?
10. 10.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
11. 11.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) tyre (d) driver gear
12. 12.🧭 A robot should turn right 90°, but its gyro shows it turned 94°. How many degrees must it turn back to the left?
13. 13.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) small (fast, weak) (d) zero
15. 15.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
16. 16.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
17. 17.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) under the right sensor (d) far behind it
18. 18.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) faster but weaker (c) not at all (d) slower but stronger
19. 19.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
20. 20.🧭 A robot faces east. It does: turn right, turn right, turn right. Which way does it face now? (a) north (b) west (c) south (d) east
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.🧭 A robot should turn right 180°, but its gyro shows it turned 167°. How many degrees must it turn more to the right?
24. 24.⚙️ A motor makes 480 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
26. 26.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
27. 27.🧭 A robot should turn right 180°, but its gyro shows it turned 194°. How many degrees must it turn back to the left?
28. 28.📡 A robot is 290 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 3 seconds (in cm)?
29. 29.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
30. 30.📡 A robot is 160 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 13 seconds (in cm)?
31. 31.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is hot (d) black is loud
32. 32.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 180° (d) 45°
33. 33.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
34. 34.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
35. 35.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
36. 36.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) tracks (c) legs (d) wheels
37. 37.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) water drops (c) bright light (d) sound too high to hear
38. 38.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points right (c) points up and right (d) points up and left
39. 39.Which job needs a camera? (a) know a button is pressed (b) measure a turn angle (c) read a QR code (d) follow a black line
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right

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