Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 570 · 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.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.Which of these suits legs? (a) moving under water (b) a flat road (c) a field of tall boulders (d) a hospital corridor
3. 3.Which of these suits legs? (a) stepping over wide gaps (b) loose sand dunes (c) moving under water (d) a hospital corridor
4. 4.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) smell smoke (c) see colours (d) hear claps
5. 5.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a temperature sensor (c) a touch sensor (d) a distance sensor
6. 6.True or false: to follow a black line, use a light sensor. (a) True (b) False
7. 7.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
10. 10.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a distance sensor (c) a temperature sensor (d) a camera
11. 11.Which of these suits propellers? (a) moving under water (b) stepping over wide gaps (c) a hospital corridor (d) a smooth classroom floor
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.Which job needs a camera? (a) find the brightest spot (b) read a QR code (c) know a button is pressed (d) measure a turn angle
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
16. 16.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they spin in the air (d) they are round
17. 17.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
18. 18.🛞 Circumference = π × … (a) radius only (b) weight (c) speed (d) diameter
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
21. 21.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
22. 22.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 50
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
24. 24.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a touch sensor
25. 25.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black soaks up light (d) black is hot
26. 26.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
27. 27.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) driver teeth (d) motor volts
28. 28.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
29. 29.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its diameter (c) its radius (d) its weight
30. 30.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
31. 31.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
32. 32.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
33. 33.True or false: “a long factory floor” suits wheels. (a) False (b) True
34. 34.📡 A robot is 210 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
36. 36.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
37. 37.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 23. What is under the sensor? (a) the white floor (b) the black line
38. 38.🔍 Which sensor helps a robot start on a hand clap? (a) a light sensor (b) a sound sensor (c) a touch sensor (d) a camera
39. 39.Which job needs a light sensor? (a) start on a hand clap (b) follow a black line (c) hear a whistle (d) measure a turn angle
40. 40.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1188 cm?

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