Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 566 · 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.🛞 Which way of moving suits this best: “moving under water”? (a) propellers (b) tracks (c) wheels (d) legs
2. 2.🛞 Circumference = π × … (a) weight (b) diameter (c) speed (d) radius only
3. 3.⚙️ A motor makes 40 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
4. 4.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
5. 5.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 58. What is under the sensor? (a) the white floor (b) the black line
6. 6.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
7. 7.📡 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)?
8. 8.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a light sensor (c) a distance sensor (d) a gyro sensor
9. 9.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
10. 10.Which job needs a touch sensor? (a) stay balanced upright (b) find the brightest spot (c) feel a bump into a wall (d) follow a black line
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 15. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
12. 12.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
13. 13.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
14. 14.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
15. 15.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
16. 16.🔢 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
17. 17.📡 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)?
18. 18.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a metal door (c) a wooden box (d) a soft foam cushion
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
20. 20.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
22. 22.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) at the same speed (c) slower but stronger (d) not at all
23. 23.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 27. What is under the sensor? (a) the white floor (b) the black line
24. 24.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 9. What is under the sensor? (a) the white floor (b) the black line
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
26. 26.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a servo (c) a caster wheel (d) a gear
27. 27.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 360° (d) 45°
28. 28.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
29. 29.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
30. 30.📡 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?
31. 31.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a sound sensor
32. 32.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
33. 33.⚙️ A motor makes 400 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
34. 34.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
35. 35.📡 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 12 seconds (in cm)?
36. 36.Which of these suits propellers? (a) stepping over wide gaps (b) a muddy building site (c) crossing stepping-stones (d) flying over a field
37. 37.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) turn by exact angles (d) hear claps
38. 38.🧭 A robot faces north. It does: turn right, turn around, turn around, turn right. Which way does it face now? (a) north (b) east (c) west (d) south
39. 39.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) never important (d) small (fast, weak)
40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor

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