Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 577 · 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 common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
2. 2.🧭 A robot should turn right 45°, but its gyro shows it turned 49°. How many degrees must it turn back to the left?
3. 3.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
4. 4.Which job needs a light sensor? (a) follow a black line (b) stop before a wall (c) measure a turn angle (d) hear a whistle
5. 5.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
7. 7.🛞 Circumference = π × … (a) diameter (b) weight (c) speed (d) radius only
8. 8.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 36. What is under the sensor? (a) the white floor (b) the black line
9. 9.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.⚙️ A motor makes 50 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
11. 11.🧭 A robot spins 45° every second. How many seconds does it take to turn 180°?
12. 12.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) legs (c) propellers (d) tracks
13. 13.📡 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?
14. 14.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
15. 15.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 360° (c) 90° (d) 45°
16. 16.🦾 A servo moves from 30° to 140°. How many degrees does it turn?
17. 17.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 20. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
20. 20.True or false: “a muddy building site” suits propellers. (a) True (b) False
21. 21.Which job needs a sound sensor? (a) follow a black line (b) read a QR code (c) start on a hand clap (d) measure a turn angle
22. 22.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
23. 23.🧭 A robot spins 15° every second. How many seconds does it take to turn 180°?
24. 24.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
25. 25.⬛ 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
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 95. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
28. 28.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a touch sensor (c) a camera (d) a distance sensor
31. 31.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 27 times. How many times does the driven gear turn?
32. 32.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
33. 33.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
34. 34.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
35. 35.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 22 (c) 2/7 (d) 7/22
36. 36.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
37. 37.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
38. 38.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
39. 39.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
40. 40.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big

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