Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 388 · 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.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°
2. 2.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
3. 3.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
4. 4.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
5. 5.🔍 Which sensor helps a robot spot a red ball? (a) a temperature sensor (b) a distance sensor (c) a touch sensor (d) a camera
6. 6.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
7. 7.True or false: “hovering over a roof” suits propellers. (a) False (b) True
8. 8.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
9. 9.🧭 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 right 45°, then left 90°, then left 135°. What does the gyro read now (0° to 359°)?
10. 10.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
12. 12.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
14. 14.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 6 seconds (in cm)?
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a metal door (c) a wooden box (d) a flat wall
16. 16.Which job needs a camera? (a) measure a turn angle (b) stop before a wall (c) read a QR code (d) follow a black line
17. 17.⚙️ 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
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
20. 20.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) wheels (c) tracks (d) propellers
21. 21.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
22. 22.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
23. 23.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
24. 24.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they climb stairs (c) they float (d) they look funny
25. 25.🧭 A robot spins 30° every second. How many seconds does it take to turn 150°?
26. 26.True or false: to stay balanced upright, use a temperature sensor. (a) False (b) True
27. 27.True or false: “a hospital corridor” suits propellers. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
29. 29.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
30. 30.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
31. 31.🧭 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 270°. It turns right 180°, then right 120°, then right 180°. What does the gyro read now (0° to 359°)?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.⚙️ 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
34. 34.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) propellers (c) wheels (d) legs
35. 35.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
36. 36.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) propellers (c) wheels (d) legs
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
38. 38.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
39. 39.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 7/22 (d) 2/7
40. 40.⚙️ A 30-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed

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