Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 456 · 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.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its radius (d) its circumference
2. 2.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 80. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
4. 4.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) far behind it (d) under the right sensor
5. 5.⚙️ 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 big driver gear (b) a small driver gear
6. 6.Which job needs a light sensor? (a) measure how far a box is (b) warn if motors get hot (c) find the brightest spot (d) start on a hand clap
7. 7.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) slower but stronger (c) at the same speed (d) not at all
8. 8.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
9. 9.True or false: “hovering over a roof” suits legs. (a) True (b) False
10. 10.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 180° (d) 360°
11. 11.True or false: “a muddy building site” suits legs. (a) True (b) False
12. 12.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) one up, one down (d) in opposite directions
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
14. 14.Which of these suits propellers? (a) deep mud (b) crossing stepping-stones (c) hovering over a roof (d) a muddy building site
15. 15.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
16. 16.Which job needs a light sensor? (a) hear a whistle (b) stay balanced upright (c) follow a black line (d) measure how far a box is
17. 17.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
18. 18.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
19. 19.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 54. What is under the sensor? (a) the black line (b) the white floor
20. 20.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
21. 21.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
22. 22.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
23. 23.Which job needs a gyro sensor? (a) start on a hand clap (b) follow a black line (c) measure how far a box is (d) measure a turn angle
24. 24.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
25. 25.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) teeth (c) tyres (d) spokes
26. 26.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
27. 27.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) black (d) water
28. 28.⚙️ A motor makes 350 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
29. 29.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
30. 30.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
31. 31.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
32. 32.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
35. 35.Which job needs a temperature sensor? (a) spot a red ball (b) find the brightest spot (c) start on a hand clap (d) warn if motors get hot
36. 36.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
37. 37.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
38. 38.Which of these suits legs? (a) flying over a field (b) a long factory floor (c) stepping over wide gaps (d) soft snow
39. 39.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor

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