Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 544 · 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 30-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
2. 2.📡 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
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
4. 4.📡 Why do we halve the echo’s total path? (a) sound is slow (b) it goes there and back (c) to make it smaller (d) the sensor is half
5. 5.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
6. 6.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
7. 7.🦾 A servo program runs:
   angle = 150
   angle = angle − 20
   angle = angle + 50
   angle = angle − 10
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
8. 8.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) propellers (c) wheels (d) legs
9. 9.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
11. 11.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
12. 12.True or false: to read a QR code, use a temperature sensor. (a) True (b) False
13. 13.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 1 (d) 2
14. 14.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) legs (c) propellers (d) wheels
15. 15.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
17. 17.🧭 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 60°, then left 45°. What does the gyro read now (0° to 359°)?
18. 18.🛞 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 2 times. How far does the robot roll (in cm)?
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
21. 21.📡 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)?
22. 22.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) they are too cheap (d) harder to balance
23. 23.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) tyre (d) driver gear
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 40. What is under the sensor? (a) the white floor (b) the black line
26. 26.Which job needs a camera? (a) spot a red ball (b) start on a hand clap (c) warn if motors get hot (d) measure a turn angle
27. 27.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
28. 28.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
29. 29.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
30. 30.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
31. 31.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
32. 32.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
34. 34.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
35. 35.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
36. 36.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the top speed (d) the wheel size
37. 37.⚙️ A motor makes 400 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
38. 38.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its weight (c) its diameter (d) its circumference
39. 39.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 360° (d) 180°
40. 40.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise

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