Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 473 · 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.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
2. 2.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) small (fast, weak) (d) never important
3. 3.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
4. 4.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black is wet (d) black soaks up light
5. 5.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
6. 6.True or false: “a hospital corridor” suits propellers. (a) False (b) True
7. 7.🧭 What does a gyro help a robot do? (a) smell smoke (b) hear claps (c) turn by exact angles (d) see colours
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 85. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
9. 9.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.🛞 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 12 times. How far does the robot roll (in cm)?
12. 12.Which of these suits propellers? (a) crossing stepping-stones (b) deep mud (c) stepping over wide gaps (d) flying over a field
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
14. 14.🧭 A robot spins 45° every second. How many seconds does it take to turn 270°?
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
17. 17.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) in opposite directions (d) one up, one down
18. 18.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
19. 19.Which of these suits wheels? (a) loose sand dunes (b) a smooth classroom floor (c) hovering over a roof (d) a muddy building site
20. 20.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a goldfish (d) a bat
21. 21.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 47 seconds (in cm)?
22. 22.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
23. 23.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
24. 24.🧭 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 left 90°, then right 180°, then left 60°. What does the gyro read now (0° to 359°)?
25. 25.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
26. 26.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its circumference (c) its diameter (d) its radius
28. 28.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
30. 30.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
31. 31.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
32. 32.True or false: “deep mud” suits tracks. (a) True (b) False
33. 33.⚙️ A motor makes 40 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
34. 34.🛞 Circumference = π × … (a) diameter (b) speed (c) radius only (d) weight
35. 35.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
36. 36.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to look colourful (d) to use more power
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.True or false: “a long factory floor” suits propellers. (a) True (b) False
39. 39.⚙️ 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
40. 40.🦾 A servo moves from 160° to 110°. How many degrees does it turn?

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