Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 840 · 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 light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
2. 2.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
5. 5.📡 Why do we halve the echo’s total path? (a) sound is slow (b) the sensor is half (c) it goes there and back (d) to make it smaller
6. 6.⚙️ A motor makes 60 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
7. 7.🦾 A servo program runs:
   angle = 70
   angle = angle + 50
   angle = angle − 20
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
9. 9.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
10. 10.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
11. 11.🧭 A robot faces north. It does: turn right, turn around, turn around, turn right. Which way does it face now? (a) west (b) north (c) south (d) east
12. 12.🧭 A robot faces south. It does: turn right, turn left, turn around, turn around. Which way does it face now? (a) south (b) west (c) east (d) north
13. 13.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
14. 14.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 20 seconds (in cm)?
15. 15.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a light sensor (c) a gyro sensor (d) a distance sensor
16. 16.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
17. 17.🧭 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 0°. It turns left 180°, then left 90°. What does the gyro read now (0° to 359°)?
18. 18.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
19. 19.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 45. What is under the sensor? (a) the white floor (b) the black line
20. 20.Which of these suits propellers? (a) a smooth classroom floor (b) a long factory floor (c) stepping over wide gaps (d) hovering over a roof
21. 21.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
22. 22.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
23. 23.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
25. 25.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 90° (c) 45° (d) 360°
26. 26.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) propellers (c) legs (d) wheels
28. 28.🔍 Which sensor helps a robot feel a bump into a wall? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a touch sensor
29. 29.🦾 A servo moves from 120° to 50°. How many degrees does it turn?
30. 30.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
31. 31.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
32. 32.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
33. 33.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) big (slow and strong) (d) never important
34. 34.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times bigger (d) 3 times slower
35. 35.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 20. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
39. 39.Which job needs a gyro sensor? (a) find the brightest spot (b) spot a red ball (c) measure a turn angle (d) start on a hand clap
40. 40.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor

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