Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 501 · 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 light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🦾 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 straight up (c) points up and left (d) points up and right
4. 4.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
6. 6.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
7. 7.🧭 A robot faces west. It does: turn right, turn left, turn around, turn around. Which way does it face now? (a) east (b) west (c) north (d) south
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 75. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
10. 10.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
11. 11.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
12. 12.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its circumference (d) its diameter
13. 13.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
14. 14.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to know their world (d) to use more power
15. 15.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 10
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
17. 17.True or false: to warn if motors get hot, use a touch sensor. (a) True (b) False
18. 18.🧭 A robot faces south. It does: turn around, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
19. 19.True or false: to read a QR code, use a camera. (a) True (b) False
20. 20.True or false: to measure a turn angle, use a gyro sensor. (a) True (b) False
21. 21.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) driver gear (d) tyre
22. 22.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
24. 24.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a bat (c) a goldfish (d) a snail
26. 26.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) tracks (d) propellers
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
28. 28.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
29. 29.Which job needs a temperature sensor? (a) hear a whistle (b) stop before a wall (c) follow a black line (d) warn if motors get hot
30. 30.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.Which of these suits legs? (a) stepping over wide gaps (b) a flat road (c) a muddy building site (d) a smooth classroom floor
32. 32.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they look funny (d) they climb stairs
33. 33.🧭 A robot spins 15° every second. How many seconds does it take to turn 15°?
34. 34.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a track (d) a caster wheel
36. 36.🦾 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 up and right (b) points straight up (c) points up and left (d) points right
37. 37.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
38. 38.Which of these suits propellers? (a) stepping over wide gaps (b) flying over a field (c) a flat road (d) soft snow
39. 39.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) too fast on floors (c) harder to balance (d) they are too cheap
40. 40.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?

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