Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 372 · 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 of these suits wheels? (a) a smooth classroom floor (b) a muddy building site (c) stepping over wide gaps (d) soft snow
2. 2.True or false: to spot a red ball, use a sound sensor. (a) False (b) True
3. 3.🧭 A robot should turn right 180°, but its gyro shows it turned 186°. How many degrees must it turn back to the left?
4. 4.🦾 A servo program runs:
   angle = 20
   angle = angle + 40
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
5. 5.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
6. 6.🦾 A servo program runs:
   angle = 60
   angle = angle − 40
   angle = angle + 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
8. 8.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
9. 9.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
10. 10.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
11. 11.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 34 cm (d) 3 cm
12. 12.Which job needs a sound sensor? (a) stay balanced upright (b) spot a red ball (c) follow a black line (d) hear a whistle
13. 13.🧭 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 0°. It turns right 90°, then left 120°, then left 45°. What does the gyro read now (0° to 359°)?
14. 14.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
15. 15.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
16. 16.🧭 A robot should turn right 90°, but its gyro shows it turned 78°. How many degrees must it turn more to the right?
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False
19. 19.Which of these suits legs? (a) a smooth classroom floor (b) a long factory floor (c) moving under water (d) a field of tall boulders
20. 20.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 28. What is under the sensor? (a) the black line (b) the white floor
21. 21.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 360° (d) 100°
22. 22.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
23. 23.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a gyro sensor (c) a distance sensor (d) a touch sensor
24. 24.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
25. 25.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🧭 A robot spins 15° every second. How many seconds does it take to turn 60°?
27. 27.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
28. 28.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 31 seconds (in cm)?
29. 29.🛞 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)?
30. 30.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.📡 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)?
32. 32.True or false: “a long factory floor” suits tracks. (a) False (b) True
33. 33.📡 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)?
34. 34.Which job needs a touch sensor? (a) feel a bump into a wall (b) measure how far a box is (c) read a QR code (d) find the brightest spot
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
36. 36.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 1 (d) 3
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
38. 38.📡 A robot is 240 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 17 seconds (in cm)?
39. 39.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
40. 40.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) wheels (c) tracks (d) propellers

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