Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 772 · 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 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
2. 2.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 49. What is under the sensor? (a) the black line (b) the white floor
3. 3.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
4. 4.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 180° (d) 45°
5. 5.🦾 A servo moves from 50° to 100°. How many degrees does it turn?
6. 6.📡 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)?
7. 7.True or false: “a long factory floor” suits tracks. (a) True (b) False
8. 8.📡 A robot is 180 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 3 seconds (in cm)?
9. 9.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
11. 11.🧭 A robot faces west. It does: turn left, turn left, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
12. 12.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
13. 13.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a white surface (d) a dark tunnel
14. 14.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the right sensor (c) far behind it (d) under the left sensor
15. 15.⚙️ 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 small driver gear (b) a big driver gear
16. 16.⚙️ A motor makes 50 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?
17. 17.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
18. 18.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
19. 19.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
20. 20.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 33. What is under the sensor? (a) the black line (b) the white floor
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
25. 25.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a light sensor (c) a touch sensor (d) a distance sensor
26. 26.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
27. 27.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a touch sensor (c) a camera (d) a sound sensor
28. 28.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
29. 29.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a wooden box (c) a soft foam cushion (d) a flat wall
30. 30.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
31. 31.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
32. 32.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
33. 33.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
34. 34.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the black/white cut-off (d) the wheel size
35. 35.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) propellers (c) legs (d) wheels
36. 36.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times slower (d) 3 times faster
37. 37.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
38. 38.Which job needs a sound sensor? (a) find the brightest spot (b) spot a red ball (c) read a QR code (d) hear a whistle
39. 39.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
40. 40.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops

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