Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 469 · 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 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
2. 2.Which job needs a touch sensor? (a) start on a hand clap (b) stop before a wall (c) measure how far a box is (d) feel a bump into a wall
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
4. 4.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
5. 5.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) black (d) white
6. 6.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
7. 7.Which job needs a camera? (a) feel a bump into a wall (b) read a QR code (c) measure how far a box is (d) hear a whistle
8. 8.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) wheels (c) propellers (d) tracks
9. 9.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
10. 10.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 70. What is under the sensor? (a) the black line (b) the white floor
11. 11.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
12. 12.True or false: to read a QR code, use a touch sensor. (a) True (b) False
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
14. 14.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 3 cm (d) 34 cm
15. 15.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
16. 16.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) tracks (c) legs (d) propellers
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
19. 19.Which job needs a light sensor? (a) stay balanced upright (b) read a QR code (c) follow a black line (d) warn if motors get hot
20. 20.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) one wheel runs faster (c) it stops for ever (d) it jumps
21. 21.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) tyre (d) driver gear
22. 22.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they are shiny (d) they spin in the air
23. 23.📡 A robot is 100 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 10 seconds (in cm)?
24. 24.True or false: “a hospital corridor” suits wheels. (a) False (b) True
25. 25.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
26. 26.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 180° (d) 45°
27. 27.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
28. 28.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 3 (c) 2 (d) 1
29. 29.True or false: to measure a turn angle, use a touch sensor. (a) False (b) True
30. 30.🔍 Which sensor helps a robot read a QR code? (a) a gyro sensor (b) a touch sensor (c) a temperature sensor (d) a camera
31. 31.🧭 What does a gyro help a robot do? (a) hear claps (b) turn by exact angles (c) smell smoke (d) see colours
32. 32.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 22/7 (d) 2/7
33. 33.📡 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)?
34. 34.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
35. 35.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 27. What is under the sensor? (a) the white floor (b) the black line
36. 36.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
37. 37.Which of these suits tracks? (a) crossing stepping-stones (b) stepping over wide gaps (c) loose sand dunes (d) hovering over a roof
38. 38.⚙️ A 10-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
39. 39.🔍 Which sensor helps a robot measure how far a box is? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
40. 40.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?

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