Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 609 · 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.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) big (slow and strong) (d) small (fast, weak)
2. 2.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
3. 3.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
4. 4.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
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 right (b) points up and left (c) points straight up (d) points right
7. 7.⚙️ A motor makes 160 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
8. 8.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) legs (c) wheels (d) tracks
9. 9.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black soaks up light (d) black is wet
11. 11.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 32. What is under the sensor? (a) the black line (b) the white floor
12. 12.Which of these suits wheels? (a) moving under water (b) flying over a field (c) a field of tall boulders (d) a flat road
13. 13.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
14. 14.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
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 0°. It turns right 135°, then left 135°. What does the gyro read now (0° to 359°)?
17. 17.⚙️ A motor makes 120 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
18. 18.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
19. 19.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
20. 20.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
21. 21.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) the sky (d) white
22. 22.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
23. 23.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
24. 24.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
25. 25.🧭 A robot should turn right 90°, but its gyro shows it turned 82°. How many degrees must it turn more to the right?
26. 26.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
28. 28.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
29. 29.True or false: “loose sand dunes” suits tracks. (a) True (b) False
30. 30.Which job needs a sound sensor? (a) stop before a wall (b) start on a hand clap (c) read a QR code (d) find the brightest spot
31. 31.🦾 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 up and left (b) points right (c) points straight up (d) points left
32. 32.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
33. 33.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
34. 34.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the wheel size (d) the black/white cut-off
35. 35.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
36. 36.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
37. 37.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
38. 38.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
39. 39.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a touch sensor (c) a temperature sensor (d) a sound sensor
40. 40.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids