Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 222 · 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.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
2. 2.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a camera (c) a gyro sensor (d) a sound sensor
3. 3.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
4. 4.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
7. 7.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
8. 8.⚙️ 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
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 176 cm?
10. 10.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
11. 11.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a snail (d) a cow
12. 12.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 53. What is under the sensor? (a) the white floor (b) the black line
13. 13.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
14. 14.🔍 Why do robots need sensors? (a) to look colourful (b) to know their world (c) to use more power (d) to be heavier
15. 15.⚙️ A motor makes 300 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
16. 16.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
17. 17.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are shiny (c) they are round (d) they spin in the air
18. 18.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
19. 19.🔦 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 right sensor (c) the left sensor (d) neither sensor
20. 20.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🛞 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 forward. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) spins left on the spot (d) turns left
23. 23.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
24. 24.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 90° (d) 180°
25. 25.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
26. 26.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 360° (d) 180°
27. 27.📡 A robot is 160 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)?
28. 28.🧭 A robot faces west. It does: turn around, turn left, turn left. Which way does it face now? (a) north (b) south (c) west (d) east
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
30. 30.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
31. 31.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 38. What is under the sensor? (a) the white floor (b) the black line
32. 32.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
33. 33.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
34. 34.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
35. 35.⚙️ A motor makes 150 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
36. 36.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
37. 37.⚙️ A motor makes 280 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
39. 39.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°

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