Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 266 · 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.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is loud (d) black is wet
2. 2.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
3. 3.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) propellers (c) wheels (d) tracks
4. 4.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times slower (d) 3 times bigger
5. 5.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
6. 6.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points right (c) points up and left (d) points up and right
7. 7.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
8. 8.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
10. 10.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points up and right (c) points up and left (d) points straight up
11. 11.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a distance sensor (c) a gyro sensor (d) a touch sensor
12. 12.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) water (d) black
13. 13.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 45 seconds (in cm)?
14. 14.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
15. 15.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
17. 17.Which job needs a distance sensor? (a) feel a bump into a wall (b) stay balanced upright (c) measure how far a box is (d) find the brightest spot
18. 18.True or false: to follow a black line, use a touch sensor. (a) False (b) True
19. 19.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
20. 20.True or false: to hear a whistle, use a distance sensor. (a) True (b) False
21. 21.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
22. 22.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
24. 24.Which of these suits wheels? (a) hovering over a roof (b) a field of tall boulders (c) a smooth classroom floor (d) moving under water
25. 25.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a gyro sensor (c) a light sensor (d) a distance sensor
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
27. 27.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
28. 28.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) driver teeth (d) number of gears
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
30. 30.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
32. 32.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a sound sensor (c) a touch sensor (d) a camera
33. 33.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
34. 34.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
35. 35.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster and weaker
36. 36.🧭 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 180°. It turns right 120°, then left 45°. What does the gyro read now (0° to 359°)?
37. 37.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a soft foam cushion (d) a metal door
38. 38.📡 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?
39. 39.Which job needs a temperature sensor? (a) warn if motors get hot (b) start on a hand clap (c) spot a red ball (d) measure a turn angle
40. 40.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?

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