Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 10 · 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 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
2. 2.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) tracks (c) legs (d) wheels
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
8. 8.⚙️ A 20-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
9. 9.True or false: to stop before a wall, use a sound sensor. (a) False (b) True
10. 10.Which of these suits wheels? (a) loose sand dunes (b) a muddy building site (c) crossing stepping-stones (d) a flat road
11. 11.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
12. 12.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
13. 13.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
14. 14.Which of these suits legs? (a) a muddy building site (b) moving under water (c) crossing stepping-stones (d) a smooth classroom floor
15. 15.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
16. 16.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
17. 17.🧭 A robot faces west. It does: turn right, turn left. Which way does it face now? (a) south (b) west (c) north (d) east
18. 18.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a wooden box (c) a metal door (d) a flat wall
20. 20.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
22. 22.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
23. 23.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 180° (d) 90°
24. 24.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) between the two sensors (d) under the right sensor
25. 25.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) radio music (c) bright light (d) water drops
26. 26.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
27. 27.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) harder to balance (c) they are too cheap (d) too fast on floors
28. 28.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and left
29. 29.🧭 A robot should turn right 90°, but its gyro shows it turned 87°. How many degrees must it turn more to the right?
30. 30.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
31. 31.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
32. 32.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
33. 33.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
34. 34.🧭 A robot faces west. It does: turn left, turn right. Which way does it face now? (a) north (b) east (c) west (d) south
35. 35.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
36. 36.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
37. 37.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
38. 38.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
39. 39.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
40. 40.📡 A robot is 190 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 13 seconds (in cm)?

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