Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 781 · 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 motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
2. 2.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
3. 3.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
4. 4.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) legs (c) wheels (d) tracks
6. 6.True or false: “a field of tall boulders” suits wheels. (a) False (b) True
7. 7.🧭 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 right 135°, then left 135°. What does the gyro read now (0° to 359°)?
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
10. 10.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22 (d) 22/7
11. 11.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
12. 12.🔍 Which sensor helps a robot stay balanced upright? (a) a temperature sensor (b) a gyro sensor (c) a camera (d) a distance sensor
13. 13.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
14. 14.📡 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)?
15. 15.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
16. 16.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
17. 17.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
18. 18.⚙️ A motor makes 140 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
19. 19.True or false: “a muddy building site” suits tracks. (a) False (b) True
20. 20.🧭 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 left 135°, then left 60°. What does the gyro read now (0° to 359°)?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 30. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
22. 22.⚙️ A motor makes 50 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
23. 23.Which job needs a camera? (a) follow a black line (b) know a button is pressed (c) warn if motors get hot (d) spot a red ball
24. 24.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 180° (d) 90°
25. 25.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
26. 26.🦾 A servo moves from 160° to 120°. How many degrees does it turn?
27. 27.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
28. 28.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a cow (d) a bat
29. 29.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
30. 30.🧭 A robot should turn right 180°, but its gyro shows it turned 185°. How many degrees must it turn back to the left?
31. 31.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) it goes there and back (d) sound is slow
32. 32.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
33. 33.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
34. 34.⚙️ 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
35. 35.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points right (c) points straight up (d) points up and right
36. 36.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 4 (d) 1
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
38. 38.🧭 A robot faces north. It does: turn around, turn right, turn right. Which way does it face now? (a) south (b) west (c) east (d) north
39. 39.🛞 Circumference = π × … (a) speed (b) radius only (c) weight (d) diameter
40. 40.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big

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