Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 694 · 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.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
2. 2.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
3. 3.📡 A robot is 150 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 13 seconds (in cm)?
4. 4.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
5. 5.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 30. What is under the sensor? (a) the white floor (b) the black line
6. 6.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) faster and weaker (c) at the same speed (d) not at all
7. 7.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
8. 8.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
10. 10.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
11. 11.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) driven gear (c) idler gear (d) tyre
12. 12.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
13. 13.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
14. 14.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
15. 15.🔍 Which sensor helps a robot stop before a wall? (a) a touch sensor (b) a temperature sensor (c) a distance sensor (d) a gyro sensor
16. 16.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
18. 18.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) one up, one down (d) the same direction
19. 19.⚙️ 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
20. 20.True or false: to follow a black line, use a light sensor. (a) True (b) False
21. 21.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
22. 22.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) a wheel (d) an input
23. 23.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) stays still (b) turns left (c) goes straight back (d) spins right on the spot
24. 24.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) legs (b) wheels (c) tracks (d) propellers
25. 25.🧭 A robot should turn right 180°, but its gyro shows it turned 185°. How many degrees must it turn back to the left?
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
27. 27.Which job needs a gyro sensor? (a) measure a turn angle (b) stop before a wall (c) warn if motors get hot (d) feel a bump into a wall
28. 28.True or false: “deep mud” suits legs. (a) True (b) False
29. 29.🔍 Which sensor helps a robot spot a red ball? (a) a sound sensor (b) a camera (c) a touch sensor (d) a distance sensor
30. 30.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
31. 31.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22 (d) 22/7
33. 33.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) stays still (d) goes straight back
34. 34.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
37. 37.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
39. 39.⚙️ A motor makes 120 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
40. 40.🦾 A servo moves from 30° to 80°. How many degrees does it turn?

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