Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 988 · 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.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
3. 3.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
4. 4.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
5. 5.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
6. 6.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
7. 7.True or false: “hovering over a roof” suits legs. (a) False (b) True
8. 8.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) driven gear (d) tyre
9. 9.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) water (d) the sky
10. 10.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points up and left (c) points up and right (d) points straight up
13. 13.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
14. 14.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
16. 16.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) they are too cheap (d) harder to balance
17. 17.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 1 km (d) 3 cm
18. 18.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
19. 19.⚙️ A 12-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
20. 20.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
21. 21.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) turn by exact angles (d) hear claps
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
23. 23.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 20
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
26. 26.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) propellers (c) tracks (d) wheels
27. 27.True or false: “moving under water” suits propellers. (a) True (b) False
28. 28.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
29. 29.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
31. 31.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
32. 32.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
33. 33.Which job needs a gyro sensor? (a) feel a bump into a wall (b) measure a turn angle (c) find the brightest spot (d) measure how far a box is
34. 34.Which of these suits propellers? (a) flying over a field (b) a muddy building site (c) a long factory floor (d) a flat road
35. 35.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 85. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
37. 37.Which job needs a sound sensor? (a) start on a hand clap (b) warn if motors get hot (c) know a button is pressed (d) find the brightest spot
38. 38.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
39. 39.Which of these suits wheels? (a) crossing stepping-stones (b) a smooth classroom floor (c) stepping over wide gaps (d) deep mud
40. 40.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =

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