Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 635 · 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 light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
2. 2.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
3. 3.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) turns right (b) goes straight back (c) turns left (d) goes straight forward
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
5. 5.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a distance sensor (c) a temperature sensor (d) a camera
6. 6.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
9. 9.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
12. 12.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) spins right on the spot (b) goes straight forward (c) goes straight back (d) spins left on the spot
13. 13.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) tracks (c) legs (d) propellers
14. 14.🧭 A robot should turn right 45°, but its gyro shows it turned 37°. How many degrees must it turn more to the right?
15. 15.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 3 (c) 4 (d) 1
17. 17.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
19. 19.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
20. 20.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
21. 21.🧭 A robot spins 30° every second. How many seconds does it take to turn 120°?
22. 22.🦾 A servo moves from 130° to 180°. How many degrees does it turn?
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.🧭 A robot should turn right 180°, but its gyro shows it turned 190°. How many degrees must it turn back to the left?
25. 25.🔍 Which sensor helps a robot start on a hand clap? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
26. 26.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
27. 27.🧭 A robot faces north. It does: turn around, turn left, turn around, turn right. Which way does it face now? (a) south (b) east (c) west (d) north
28. 28.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) fast and easy on floors (c) they float (d) they look funny
29. 29.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
30. 30.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its weight (d) its circumference
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) the sky (d) water
34. 34.True or false: “a field of tall boulders” suits legs. (a) True (b) False
35. 35.Which of these suits wheels? (a) flying over a field (b) stepping over wide gaps (c) loose sand dunes (d) a smooth classroom floor
36. 36.Which of these suits wheels? (a) a hospital corridor (b) flying over a field (c) loose sand dunes (d) stepping over wide gaps
37. 37.⚙️ A 12-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
38. 38.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) propellers (c) wheels (d) tracks
39. 39.📡 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?
40. 40.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?

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