Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 95 · 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 40-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
2. 2.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
3. 3.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) big (slow and strong) (c) never important (d) zero
4. 4.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.📡 A robot is 200 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 2 seconds (in cm)?
6. 6.🧭 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 left 60°, then right 45°, then left 30°. What does the gyro read now (0° to 359°)?
7. 7.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
8. 8.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a servo (d) a gear
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) the same direction (d) in opposite directions
11. 11.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 54. What is under the sensor? (a) the white floor (b) the black line
12. 12.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
13. 13.🧭 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 270°. It turns left 135°, then right 60°. What does the gyro read now (0° to 359°)?
14. 14.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
15. 15.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a sound sensor (c) a distance sensor (d) a light sensor
16. 16.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
17. 17.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the left sensor (d) under the right sensor
18. 18.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) propellers (c) tracks (d) legs
19. 19.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
20. 20.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 30
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
21. 21.⬛ 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 loud (d) black is hot
22. 22.Which of these suits legs? (a) moving under water (b) a long factory floor (c) crossing stepping-stones (d) a flat road
23. 23.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
24. 24.📡 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?
25. 25.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a touch sensor (d) a gyro sensor
26. 26.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a light sensor (c) a gyro sensor (d) a camera
27. 27.🧭 A robot should turn right 45°, but its gyro shows it turned 43°. How many degrees must it turn more to the right?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
29. 29.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 40
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🧭 A robot spins 15° every second. How many seconds does it take to turn 345°?
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
32. 32.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
33. 33.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) propellers (c) tracks (d) wheels
34. 34.🛞 Why do most indoor robots use wheels? (a) they float (b) they climb stairs (c) they look funny (d) fast and easy on floors
35. 35.🧭 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 270°. It turns left 120°, then left 60°. What does the gyro read now (0° to 359°)?
36. 36.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) west (b) south (c) north (d) east
37. 37.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
38. 38.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22 (d) 22/7
39. 39.⚙️ 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
40. 40.🛞 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) spins left on the spot (b) turns left (c) goes straight back (d) turns right

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