Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 282 · 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.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) driver teeth (d) motor volts
2. 2.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
3. 3.⚙️ 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 big driver gear (b) a small driver gear
4. 4.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
5. 5.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
6. 6.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°
7. 7.🧭 A robot faces west. It does: turn right, turn left. Which way does it face now? (a) north (b) east (c) west (d) south
8. 8.Which job needs a gyro sensor? (a) start on a hand clap (b) spot a red ball (c) measure a turn angle (d) know a button is pressed
9. 9.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
10. 10.🔍 Which sensor helps a robot spot a red ball? (a) a distance sensor (b) a light sensor (c) a touch sensor (d) a camera
11. 11.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°
12. 12.🧭 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 135°, then right 45°, then right 90°. What does the gyro read now (0° to 359°)?
13. 13.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a touch sensor (c) a light sensor (d) a sound sensor
14. 14.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)
15. 15.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
16. 16.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
17. 17.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
18. 18.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a soft foam cushion (d) a flat wall
19. 19.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
20. 20.⚙️ A motor makes 400 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
21. 21.📡 A robot is 280 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
22. 22.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they look funny (d) they climb stairs
23. 23.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
26. 26.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a snail (d) a cow
27. 27.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
29. 29.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) wheels (c) propellers (d) legs
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) faster and weaker (d) at the same speed
32. 32.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
33. 33.🧭 A robot should turn right 180°, but its gyro shows it turned 194°. How many degrees must it turn back to the left?
34. 34.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
36. 36.Which of these suits tracks? (a) moving under water (b) loose sand dunes (c) flying over a field (d) stepping over wide gaps
37. 37.🧭 A robot faces east. It does: turn left, turn left. Which way does it face now? (a) south (b) north (c) west (d) east
38. 38.🧭 A robot should turn right 180°, but its gyro shows it turned 179°. How many degrees must it turn more to the right?
39. 39.📡 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?
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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