Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 157 · 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.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) big (slow and strong) (d) small (fast, weak)
2. 2.True or false: to know a button is pressed, use a light sensor. (a) False (b) True
3. 3.True or false: “stepping over wide gaps” suits propellers. (a) True (b) False
4. 4.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
5. 5.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
7. 7.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a sound sensor (c) a touch sensor (d) a distance sensor
8. 8.🔍 What does a gyro sensor measure? (a) temperature (b) sound (c) colour (d) turning (rotation)
9. 9.🦾 A servo program runs:
   angle = 40
   angle = angle + 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
11. 11.Which job needs a light sensor? (a) spot a red ball (b) read a QR code (c) stop before a wall (d) follow a black line
12. 12.📡 A robot is 220 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 9 seconds (in cm)?
13. 13.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
14. 14.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
15. 15.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
16. 16.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
17. 17.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
18. 18.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
19. 19.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight back (b) turns right (c) spins right on the spot (d) goes straight forward
20. 20.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
21. 21.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
22. 22.⚙️ 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 small driver gear (b) a big driver gear
23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
24. 24.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
25. 25.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22/7 (d) 22
26. 26.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
27. 27.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.Which job needs a gyro sensor? (a) measure a turn angle (b) measure how far a box is (c) warn if motors get hot (d) start on a hand clap
29. 29.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points up and right (c) points left (d) points straight up
30. 30.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ A motor makes 200 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
32. 32.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
33. 33.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
34. 34.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
35. 35.🧭 A robot should turn right 90°, but its gyro shows it turned 77°. How many degrees must it turn more to the right?
36. 36.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
37. 37.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
38. 38.🧭 A robot should turn right 90°, but its gyro shows it turned 91°. How many degrees must it turn back to the left?
39. 39.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?

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