Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 987 · 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.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) the same direction (d) one up, one down
2. 2.⚙️ 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
3. 3.True or false: to follow a black line, use a camera. (a) False (b) True
4. 4.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
5. 5.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
6. 6.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°
7. 7.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 90° (d) 180°
8. 8.🧭 A robot should turn right 90°, but its gyro shows it turned 97°. How many degrees must it turn back to the left?
9. 9.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
10. 10.Which job needs a light sensor? (a) follow a black line (b) measure a turn angle (c) stay balanced upright (d) feel a bump into a wall
11. 11.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
12. 12.⚙️ A motor makes 160 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins right on the spot (b) stays still (c) turns left (d) spins left on the spot
14. 14.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 594 cm?
15. 15.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a black surface (d) a white surface
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
17. 17.🧭 A robot spins 30° every second. How many seconds does it take to turn 240°?
18. 18.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) water (d) black
19. 19.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
20. 20.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
21. 21.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
22. 22.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are shiny (c) they spread the weight (d) they are round
23. 23.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) driver gear (d) tyre
24. 24.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
25. 25.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
26. 26.🦾 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 straight up (b) points up and left (c) points left (d) points right
27. 27.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
28. 28.True or false: “a long factory floor” suits wheels. (a) True (b) False
29. 29.Which job needs a sound sensor? (a) measure how far a box is (b) feel a bump into a wall (c) find the brightest spot (d) start on a hand clap
30. 30.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
31. 31.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) sound is slow (d) the sensor is half
32. 32.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is hot (c) black is wet (d) black is loud
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22/7 (d) 22
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
36. 36.True or false: to feel a bump into a wall, use a distance sensor. (a) True (b) False
37. 37.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
38. 38.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
39. 39.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
40. 40.🧭 A robot faces east. It does: turn around, turn around, turn left, turn left. Which way does it face now? (a) south (b) west (c) east (d) north

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