Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 876 · 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 should turn right 90°, but its gyro shows it turned 93°. How many degrees must it turn back to the left?
2. 2.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
3. 3.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times louder (d) 3 times slower
4. 4.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
5. 5.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22/7 (d) 22
7. 7.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a gyro sensor (c) a sound sensor (d) a distance sensor
8. 8.🔍 Which sensor helps a robot start on a hand clap? (a) a temperature sensor (b) a camera (c) a sound sensor (d) a distance sensor
9. 9.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 38. What is under the sensor? (a) the white floor (b) the black line
10. 10.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they spin in the air (d) they are shiny
11. 11.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a gyro sensor (c) a touch sensor (d) a temperature sensor
12. 12.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 1 (d) 2
13. 13.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) big (slow and strong) (d) zero
14. 14.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) legs (b) wheels (c) tracks (d) propellers
15. 15.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
16. 16.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) in opposite directions (d) they do not turn
17. 17.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns right (b) turns left (c) spins right on the spot (d) spins left on the spot
18. 18.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 90° (c) 360° (d) 45°
19. 19.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
21. 21.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
22. 22.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.🧭 A robot should turn right 90°, but its gyro shows it turned 98°. How many degrees must it turn back to the left?
27. 27.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
28. 28.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
29. 29.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
31. 31.⚙️ 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
32. 32.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
33. 33.🔍 Which sensor helps a robot stop before a wall? (a) a touch sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
34. 34.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to use more power (d) to know their world
35. 35.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is hot (c) black is loud (d) black is wet
36. 36.True or false: to follow a black line, use a light sensor. (a) True (b) False
37. 37.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
39. 39.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big

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