Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 488 · 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.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
2. 2.Which of these suits tracks? (a) a smooth classroom floor (b) deep mud (c) a field of tall boulders (d) hovering over a roof
3. 3.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
4. 4.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
5. 5.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
6. 6.Which job needs a touch sensor? (a) read a QR code (b) measure a turn angle (c) follow a black line (d) feel a bump into a wall
7. 7.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
8. 8.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster and weaker
9. 9.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) legs (c) tracks (d) propellers
10. 10.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
11. 11.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
12. 12.Which of these suits propellers? (a) flying over a field (b) a flat road (c) loose sand dunes (d) a hospital corridor
13. 13.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) teeth (d) spokes
14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
15. 15.🦾 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 right (b) points up and right (c) points left (d) points up and left
16. 16.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
17. 17.Which of these suits tracks? (a) hovering over a roof (b) a field of tall boulders (c) loose sand dunes (d) a flat road
18. 18.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 85. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
21. 21.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.⚙️ 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
23. 23.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
24. 24.True or false: “hovering over a roof” suits propellers. (a) False (b) True
25. 25.🧭 A robot should turn right 90°, but its gyro shows it turned 105°. How many degrees must it turn back to the left?
26. 26.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
29. 29.True or false: “a muddy building site” suits tracks. (a) False (b) True
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
31. 31.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
32. 32.🧭 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 135°. What does the gyro read now (0° to 359°)?
33. 33.📡 A robot is 170 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
34. 34.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
35. 35.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
36. 36.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
37. 37.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a camera (c) a distance sensor (d) a gyro sensor
38. 38.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
39. 39.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
40. 40.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a sound sensor (c) a touch sensor (d) a distance sensor

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