Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 358 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
2. 2.📡 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)?
3. 3.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
4. 4.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
6. 6.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a gyro sensor (c) a distance sensor (d) a temperature sensor
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
8. 8.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
9. 9.Which of these suits wheels? (a) moving under water (b) a field of tall boulders (c) flying over a field (d) a hospital corridor
10. 10.📡 A robot is 160 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?
11. 11.🧭 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 right 120°, then right 45°, then left 45°. What does the gyro read now (0° to 359°)?
12. 12.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
13. 13.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
14. 14.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) legs (c) wheels (d) tracks
15. 15.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
17. 17.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) not at all (c) slower but stronger (d) at the same speed
18. 18.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times slower (d) 3 times faster
19. 19.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
20. 20.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) the sky (d) black
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.🛞 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) spins left on the spot (c) turns left (d) goes straight forward
24. 24.Which of these suits propellers? (a) deep mud (b) a hospital corridor (c) stepping over wide gaps (d) flying over a field
25. 25.🧭 A robot should turn right 90°, but its gyro shows it turned 88°. How many degrees must it turn more to the right?
26. 26.🧭 A robot faces north. It does: turn left, turn right, turn right. Which way does it face now? (a) west (b) north (c) south (d) east
27. 27.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
28. 28.📡 A robot is 290 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 50 seconds (in cm)?
29. 29.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 54. What is under the sensor? (a) the white floor (b) the black line
30. 30.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
31. 31.🧭 A robot spins 15° every second. How many seconds does it take to turn 180°?
32. 32.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
33. 33.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
34. 34.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 360° (d) 100°
35. 35.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
36. 36.Which job needs a sound sensor? (a) warn if motors get hot (b) follow a black line (c) start on a hand clap (d) know a button is pressed
37. 37.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
39. 39.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
40. 40.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) zero (d) big (slow and strong)

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