Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 641 · 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.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 1 (d) 3
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
3. 3.🔍 Which sensor helps a robot follow a black line? (a) a touch sensor (b) a gyro sensor (c) a light sensor (d) a camera
4. 4.Which job needs a distance sensor? (a) read a QR code (b) follow a black line (c) stop before a wall (d) warn if motors get hot
5. 5.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
6. 6.Which of these suits tracks? (a) a hospital corridor (b) hovering over a roof (c) a flat road (d) a muddy building site
7. 7.Which of these suits wheels? (a) soft snow (b) crossing stepping-stones (c) flying over a field (d) a smooth classroom floor
8. 8.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
9. 9.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
10. 10.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its weight (c) its diameter (d) its circumference
11. 11.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times faster (d) 3 times bigger
12. 12.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
13. 13.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) black (d) white
15. 15.🦾 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 right (b) points up and left (c) points left (d) points straight up
16. 16.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
17. 17.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
18. 18.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.🛞 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
21. 21.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
22. 22.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a touch sensor (c) a sound sensor (d) a light sensor
23. 23.Which of these suits wheels? (a) soft snow (b) hovering over a roof (c) flying over a field (d) a flat road
24. 24.📡 A robot is 120 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
25. 25.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black is hot (d) black soaks up light
26. 26.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
27. 27.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
28. 28.Which of these suits wheels? (a) deep mud (b) a muddy building site (c) a long factory floor (d) a field of tall boulders
29. 29.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
30. 30.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they look funny (c) they float (d) they climb stairs
31. 31.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
32. 32.🧭 A robot faces south. It does: turn around, turn around. Which way does it face now? (a) north (b) east (c) west (d) south
33. 33.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) one wheel runs faster (d) it uses a sail
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
35. 35.📡 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?
36. 36.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
37. 37.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) in opposite directions (d) one up, one down
38. 38.🔍 Which sensor helps a robot find the brightest spot? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
39. 39.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right

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