Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 317 · 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 wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
2. 2.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
3. 3.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a gyro sensor (c) a sound sensor (d) a temperature sensor
4. 4.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
5. 5.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
6. 6.🔍 Why do robots need sensors? (a) to look colourful (b) to know their world (c) to be heavier (d) to use more power
7. 7.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 84. What is under the sensor? (a) the white floor (b) the black line
8. 8.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) between the two sensors (d) under the left sensor
9. 9.🧭 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 right 30°. What does the gyro read now (0° to 359°)?
10. 10.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
11. 11.📡 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
12. 12.🧭 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°. What does the gyro read now (0° to 359°)?
13. 13.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) pins (c) spokes (d) tyres
14. 14.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
15. 15.🧭 A robot faces north. It does: turn around, turn right. Which way does it face now? (a) south (b) west (c) north (d) east
16. 16.Which job needs a camera? (a) stay balanced upright (b) warn if motors get hot (c) read a QR code (d) follow a black line
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
18. 18.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
19. 19.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) the same direction (d) they do not turn
20. 20.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
21. 21.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) propellers (c) tracks (d) wheels
22. 22.📡 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?
23. 23.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
24. 24.🔍 Which sensor helps a robot stop before a wall? (a) a touch sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
25. 25.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a wheel (d) a gear
26. 26.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 66 cm?
27. 27.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
28. 28.Which job needs a camera? (a) stay balanced upright (b) measure how far a box is (c) follow a black line (d) spot a red ball
29. 29.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
31. 31.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
33. 33.Which job needs a touch sensor? (a) hear a whistle (b) spot a red ball (c) feel a bump into a wall (d) stop before a wall
34. 34.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) slower (d) faster
35. 35.🧭 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 left 180°, then left 60°. What does the gyro read now (0° to 359°)?
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 10. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
37. 37.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “stepping over wide gaps” suits tracks. (a) True (b) False
39. 39.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 36 times. How many times does the driven gear turn?
40. 40.⚙️ A motor makes 140 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?

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