Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 666 · 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 should turn right 90°, but its gyro shows it turned 88°. How many degrees must it turn more to the right?
2. 2.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
3. 3.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
4. 4.🧭 A robot faces east. It does: turn around, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
5. 5.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
6. 6.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they look funny (c) they float (d) they climb stairs
7. 7.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
10. 10.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) at the same speed (c) slower but stronger (d) not at all
11. 11.🧭 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 left 90°, then left 45°. What does the gyro read now (0° to 359°)?
12. 12.True or false: to know a button is pressed, use a camera. (a) False (b) True
13. 13.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
14. 14.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
15. 15.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
16. 16.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
17. 17.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
18. 18.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
19. 19.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 60
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a goldfish (d) a bat
21. 21.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
22. 22.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
23. 23.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
25. 25.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
26. 26.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
28. 28.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
29. 29.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times bigger (d) 3 times louder
30. 30.🧭 A robot should turn right 180°, but its gyro shows it turned 179°. How many degrees must it turn more to the right?
31. 31.True or false: to read a QR code, use a light sensor. (a) True (b) False
32. 32.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
33. 33.Which of these suits wheels? (a) moving under water (b) a flat road (c) soft snow (d) a muddy building site
34. 34.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
35. 35.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
36. 36.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
37. 37.Which job needs a temperature sensor? (a) warn if motors get hot (b) find the brightest spot (c) hear a whistle (d) follow a black line
38. 38.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
39. 39.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a metal door (c) a wooden box (d) a soft foam cushion
40. 40.Which of these suits propellers? (a) deep mud (b) a smooth classroom floor (c) a field of tall boulders (d) hovering over a roof

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