Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 472 · 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.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to use more power (d) to know their world
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
3. 3.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) tracks (d) wheels
4. 4.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
5. 5.Which of these suits legs? (a) a long factory floor (b) soft snow (c) hovering over a roof (d) crossing stepping-stones
6. 6.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.⚙️ A 24-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
8. 8.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) driver teeth (d) number of gears
9. 9.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it uses a sail (c) it jumps (d) one wheel runs faster
10. 10.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 3 cm (d) 340 cm
11. 11.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
12. 12.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
13. 13.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the battery size (d) the top speed
14. 14.🧭 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 180°, then left 45°. What does the gyro read now (0° to 359°)?
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🛞 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) turns left (d) spins left on the spot
17. 17.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
18. 18.🧭 A robot spins 15° every second. How many seconds does it take to turn 255°?
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
20. 20.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a distance sensor
21. 21.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) spokes (d) teeth
22. 22.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points right (c) points up and right (d) points up and left
23. 23.⚙️ A 20-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
24. 24.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) tracks (c) legs (d) propellers
25. 25.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) faster (c) slower (d) nowhere
26. 26.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
27. 27.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driver gear (c) driven gear (d) idler gear
28. 28.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 68. What is under the sensor? (a) the white floor (b) the black line
29. 29.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) fast and easy on floors (d) they look funny
30. 30.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) legs (c) propellers (d) wheels
31. 31.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
32. 32.True or false: to measure how far a box is, use a camera. (a) True (b) False
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
34. 34.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
36. 36.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
37. 37.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
40. 40.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?

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