Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 517 · 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.🛞 Circumference = π × … (a) diameter (b) speed (c) radius only (d) weight
2. 2.🦾 A servo moves from 30° to 120°. How many degrees does it turn?
3. 3.🔢 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)
4. 4.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 30. What is under the sensor? (a) the black line (b) the white floor
5. 5.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
6. 6.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they are too cheap (c) too fast on floors (d) they never tire
7. 7.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
8. 8.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
9. 9.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) propellers (b) wheels (c) legs (d) tracks
10. 10.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22/7 (d) 22
13. 13.🧭 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 90°. It turns left 120°, then left 30°, then left 90°. What does the gyro read now (0° to 359°)?
14. 14.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
15. 15.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
16. 16.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
17. 17.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) turns right (b) turns left (c) stays still (d) spins right on the spot
18. 18.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 11 seconds (in cm)?
19. 19.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
20. 20.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) a gear (d) an output
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
22. 22.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
23. 23.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
24. 24.🧭 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 135°, then left 45°. What does the gyro read now (0° to 359°)?
25. 25.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) not at all (c) faster but weaker (d) slower but stronger
26. 26.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
27. 27.🧭 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 60°, then right 45°, then left 45°. What does the gyro read now (0° to 359°)?
28. 28.True or false: “moving under water” suits propellers. (a) False (b) True
29. 29.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
31. 31.🧭 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 left 30°, then left 135°, then right 135°. What does the gyro read now (0° to 359°)?
32. 32.⬛ 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
33. 33.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 45. What is under the sensor? (a) the white floor (b) the black line
34. 34.📡 A robot is 240 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
35. 35.True or false: to read a QR code, use a camera. (a) False (b) True
36. 36.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
38. 38.True or false: to spot a red ball, use a camera. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?

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