Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 782 · 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 robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
2. 2.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
3. 3.🧭 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 180°. It turns left 45°, then right 45°. What does the gyro read now (0° to 359°)?
4. 4.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 90. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
6. 6.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
7. 7.⚙️ A motor makes 270 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
8. 8.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
10. 10.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times louder (d) 3 times faster
11. 11.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the wheel size (d) the black/white cut-off
12. 12.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
13. 13.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) in opposite directions (c) they do not turn (d) one up, one down
14. 14.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) radio music (d) water drops
15. 15.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a touch sensor (c) a temperature sensor (d) a light sensor
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
17. 17.True or false: to spot a red ball, use a gyro sensor. (a) True (b) False
18. 18.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) faster (d) nowhere
20. 20.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
21. 21.Which job needs a light sensor? (a) stop before a wall (b) feel a bump into a wall (c) know a button is pressed (d) follow a black line
22. 22.🧭 A robot should turn right 90°, but its gyro shows it turned 97°. How many degrees must it turn back to the left?
23. 23.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) an output (d) a wheel
24. 24.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
25. 25.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) water (d) the sky
26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
27. 27.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black surface (d) a black line
28. 28.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
29. 29.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.Which job needs a sound sensor? (a) start on a hand clap (b) feel a bump into a wall (c) read a QR code (d) know a button is pressed
32. 32.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) big (slow and strong) (d) small (fast, weak)
33. 33.True or false: “flying over a field” suits tracks. (a) True (b) False
34. 34.🛞 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?
35. 35.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
36. 36.📡 A robot is 160 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
37. 37.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) tracks (c) propellers (d) wheels
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
40. 40.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) slower but stronger (d) at the same speed

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