Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 832 · 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.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
2. 2.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
3. 3.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
4. 4.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
6. 6.🛞 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) stays still (b) turns left (c) spins left on the spot (d) spins right on the spot
7. 7.🧭 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 270°. It turns right 45°, then left 135°. What does the gyro read now (0° to 359°)?
8. 8.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) tracks (c) legs (d) wheels
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
11. 11.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black is wet (d) black soaks up light
12. 12.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) it goes there and back (d) to make it smaller
13. 13.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
14. 14.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 90° (d) 360°
17. 17.🔍 Which sensor helps a robot find the brightest spot? (a) a temperature sensor (b) a gyro sensor (c) a sound sensor (d) a light sensor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
19. 19.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
20. 20.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
21. 21.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
22. 22.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
23. 23.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
24. 24.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.🛞 Circumference = π × … (a) diameter (b) weight (c) radius only (d) speed
26. 26.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
28. 28.True or false: to hear a whistle, use a gyro sensor. (a) False (b) True
29. 29.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
30. 30.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are shiny (c) they are round (d) they spin in the air
31. 31.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
32. 32.True or false: “a flat road” suits propellers. (a) False (b) True
33. 33.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a sound sensor (c) a camera (d) a temperature sensor
34. 34.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
35. 35.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
37. 37.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a caster wheel (d) a servo
38. 38.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
39. 39.True or false: “a flat road” suits tracks. (a) True (b) False
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

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