Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 687 · 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 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 120°, then left 60°, then left 60°. What does the gyro read now (0° to 359°)?
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.⚙️ 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
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
6. 6.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🧭 A robot faces south. It does: turn around, turn around, turn left. Which way does it face now? (a) east (b) north (c) south (d) west
8. 8.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 21. What is under the sensor? (a) the black line (b) the white floor
9. 9.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
10. 10.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
11. 11.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
12. 12.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
13. 13.True or false: to warn if motors get hot, use a light sensor. (a) False (b) True
14. 14.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
15. 15.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
16. 16.Which job needs a touch sensor? (a) warn if motors get hot (b) stay balanced upright (c) feel a bump into a wall (d) spot a red ball
17. 17.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.Which job needs a gyro sensor? (a) hear a whistle (b) measure a turn angle (c) start on a hand clap (d) measure how far a box is
19. 19.True or false: to start on a hand clap, use a sound sensor. (a) False (b) True
20. 20.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black soaks up light (d) black is wet
21. 21.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
22. 22.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 35. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
25. 25.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
27. 27.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.📡 A robot is 230 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
29. 29.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) wheels (c) propellers (d) tracks
30. 30.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
31. 31.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a cow (c) a snail (d) a bat
32. 32.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
33. 33.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) tyre (d) driver gear
34. 34.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times bigger (d) 3 times slower
35. 35.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 66. What is under the sensor? (a) the black line (b) the white floor
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) wheel size (d) motor volts
37. 37.⚙️ A motor makes 40 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
38. 38.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) tracks (c) legs (d) propellers
39. 39.⚙️ A motor makes 160 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
40. 40.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?

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