Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 267 · 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 job needs a sound sensor? (a) hear a whistle (b) stop before a wall (c) feel a bump into a wall (d) spot a red ball
2. 2.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black soaks up light (d) black is wet
3. 3.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
5. 5.Which job needs a light sensor? (a) start on a hand clap (b) read a QR code (c) feel a bump into a wall (d) follow a black line
6. 6.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
7. 7.⚙️ 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 small driver gear (b) a big driver gear
8. 8.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
9. 9.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
10. 10.🔍 Which sensor helps a robot hear a whistle? (a) a light sensor (b) a distance sensor (c) a gyro sensor (d) a sound sensor
11. 11.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) big (slow and strong) (c) never important (d) zero
12. 12.⚙️ A 75-tooth driver gear turns a 15-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
13. 13.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
14. 14.Which of these suits tracks? (a) a hospital corridor (b) hovering over a roof (c) a flat road (d) loose sand dunes
15. 15.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
16. 16.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
17. 17.True or false: “a long factory floor” suits tracks. (a) False (b) True
18. 18.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a wooden box (d) a metal door
19. 19.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) it goes there and back (d) the sensor is half
20. 20.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) they never tire (c) too fast on floors (d) harder to balance
21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
22. 22.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a gyro sensor (c) a camera (d) a touch sensor
23. 23.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
25. 25.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) driver teeth (d) number of gears
26. 26.Which of these suits propellers? (a) crossing stepping-stones (b) stepping over wide gaps (c) hovering over a roof (d) a muddy building site
27. 27.⚙️ A 30-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
28. 28.🧭 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 60°, then right 60°, then right 180°. What does the gyro read now (0° to 359°)?
29. 29.🧭 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 45°, then right 90°, then left 45°. What does the gyro read now (0° to 359°)?
30. 30.Which of these suits propellers? (a) a hospital corridor (b) a smooth classroom floor (c) moving under water (d) soft snow
31. 31.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
32. 32.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) driver gear (c) idler gear (d) tyre
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
34. 34.🛞 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?
35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
36. 36.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
37. 37.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
38. 38.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
39. 39.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
40. 40.⬛ 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

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