Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 263 · 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.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) radio music (d) sound too high to hear
2. 2.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
3. 3.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
4. 4.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
5. 5.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 56. What is under the sensor? (a) the black line (b) the white floor
6. 6.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
7. 7.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
8. 8.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) wheels (c) propellers (d) legs
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
10. 10.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
11. 11.Which job needs a sound sensor? (a) start on a hand clap (b) know a button is pressed (c) measure a turn angle (d) spot a red ball
12. 12.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
13. 13.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 11 seconds (in cm)?
14. 14.Which job needs a light sensor? (a) stop before a wall (b) know a button is pressed (c) warn if motors get hot (d) find the brightest spot
15. 15.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
18. 18.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
22. 22.True or false: to read a QR code, use a temperature sensor. (a) False (b) True
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
24. 24.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 100° (d) 360°
25. 25.📡 A robot is 230 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 12 seconds (in cm)?
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
27. 27.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the black/white cut-off (d) the battery size
28. 28.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
29. 29.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
30. 30.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
32. 32.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
33. 33.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a cow (d) a snail
34. 34.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) legs (c) tracks (d) propellers
35. 35.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) wheels (c) tracks (d) legs
36. 36.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) spokes (d) teeth
37. 37.🧭 What does a gyro help a robot do? (a) smell smoke (b) turn by exact angles (c) hear claps (d) see colours
38. 38.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) propellers (c) wheels (d) tracks
39. 39.🧭 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 right 45°, then right 120°. What does the gyro read now (0° to 359°)?
40. 40.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black is loud (d) black soaks up light

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