Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 244 · 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.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
2. 2.True or false: “a smooth classroom floor” suits legs. (a) True (b) False
3. 3.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) big (slow and strong) (d) zero
4. 4.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 90° (d) 180°
5. 5.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 49. What is under the sensor? (a) the black line (b) the white floor
6. 6.⚙️ 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
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
8. 8.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
9. 9.📡 A robot is 160 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
10. 10.📡 Why do we halve the echo’s total path? (a) sound is slow (b) the sensor is half (c) to make it smaller (d) it goes there and back
11. 11.🧭 A robot faces east. It does: turn around, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
12. 12.🧭 A robot faces west. It does: turn right, turn left, turn left. Which way does it face now? (a) west (b) east (c) north (d) south
13. 13.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
14. 14.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times bigger (c) 3 times faster (d) 3 times louder
15. 15.True or false: to know a button is pressed, use a gyro sensor. (a) True (b) False
16. 16.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spread the weight (d) they spin in the air
17. 17.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.🧭 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 180°. It turns left 90°, then right 180°, then left 180°. What does the gyro read now (0° to 359°)?
20. 20.🧭 A robot faces east. It does: turn around, turn around. Which way does it face now? (a) north (b) west (c) south (d) east
21. 21.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
23. 23.True or false: “flying over a field” suits propellers. (a) False (b) True
24. 24.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
26. 26.True or false: to spot a red ball, use a camera. (a) False (b) True
27. 27.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.📡 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)?
29. 29.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) tracks (d) propellers
30. 30.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
31. 31.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black soaks up light (d) black is loud
32. 32.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
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 440 cm?
34. 34.True or false: “stepping over wide gaps” suits wheels. (a) True (b) False
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 75. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
36. 36.🔍 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
37. 37.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points right (c) points up and left (d) points straight up
38. 38.Which job needs a gyro sensor? (a) spot a red ball (b) follow a black line (c) stay balanced upright (d) find the brightest spot
39. 39.Which job needs a distance sensor? (a) start on a hand clap (b) know a button is pressed (c) feel a bump into a wall (d) stop before a wall
40. 40.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids