Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 123 · 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.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
2. 2.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
3. 3.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
4. 4.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it uses a sail (d) it stops for ever
5. 5.🧭 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 270°. It turns right 120°, then right 30°, then right 135°. What does the gyro read now (0° to 359°)?
6. 6.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) driven gear (d) tyre
7. 7.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
8. 8.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
9. 9.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) propellers (c) legs (d) wheels
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
11. 11.Which job needs a touch sensor? (a) follow a black line (b) spot a red ball (c) warn if motors get hot (d) feel a bump into a wall
12. 12.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
13. 13.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
14. 14.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
15. 15.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
16. 16.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 74. What is under the sensor? (a) the white floor (b) the black line
17. 17.⚙️ A 15-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
20. 20.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
21. 21.🔍 Which sensor helps a robot stay balanced upright? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a gyro sensor
22. 22.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
23. 23.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
24. 24.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) driver teeth (d) number of gears
25. 25.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is loud (d) black is hot
26. 26.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
27. 27.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) sound is slow (d) the sensor is half
28. 28.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a cow (c) a snail (d) a bat
29. 29.True or false: to measure how far a box is, use a camera. (a) False (b) True
30. 30.📡 A robot is 190 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 16 seconds (in cm)?
31. 31.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times bigger (d) 3 times faster
32. 32.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 7/22 (d) 22
33. 33.True or false: “soft snow” suits tracks. (a) False (b) True
34. 34.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
35. 35.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
36. 36.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
37. 37.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 57. What is under the sensor? (a) the white floor (b) the black line
38. 38.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.True or false: to measure how far a box is, use a distance sensor. (a) True (b) False
40. 40.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?

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