Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 605 · 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 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
2. 2.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
3. 3.Which job needs a gyro sensor? (a) read a QR code (b) stay balanced upright (c) spot a red ball (d) hear a whistle
4. 4.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
5. 5.🧭 A robot faces east. It does: turn right, turn right. Which way does it face now? (a) south (b) west (c) north (d) east
6. 6.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
7. 7.🦾 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 right (b) points up and left (c) points right (d) points straight up
8. 8.True or false: “deep mud” suits propellers. (a) False (b) True
9. 9.📡 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)?
10. 10.⚙️ A motor makes 200 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
11. 11.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
13. 13.🧭 A robot spins 15° every second. How many seconds does it take to turn 315°?
14. 14.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
15. 15.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
16. 16.Which of these suits tracks? (a) a field of tall boulders (b) soft snow (c) flying over a field (d) a smooth classroom floor
17. 17.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
18. 18.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
19. 19.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 24. What is under the sensor? (a) the white floor (b) the black line
20. 20.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
22. 22.True or false: “flying over a field” suits propellers. (a) True (b) False
23. 23.⚙️ 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
24. 24.📡 A robot is 200 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 12 seconds (in cm)?
25. 25.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
26. 26.📡 A robot is 190 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
27. 27.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) in opposite directions (d) the same direction
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight back (b) spins left on the spot (c) turns left (d) spins right on the spot
29. 29.📡 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
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
31. 31.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.🔍 Which sensor helps a robot spot a red ball? (a) a distance sensor (b) a light sensor (c) a touch sensor (d) a camera
33. 33.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) white (d) black
35. 35.Which job needs a sound sensor? (a) spot a red ball (b) start on a hand clap (c) stay balanced upright (d) measure a turn angle
36. 36.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) wheels (c) tracks (d) propellers
37. 37.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) small (fast, weak) (d) big (slow and strong)
38. 38.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?

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