Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 15 · 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 gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
2. 2.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a touch sensor (c) a temperature sensor (d) a sound sensor
3. 3.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
4. 4.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) propellers (b) legs (c) wheels (d) tracks
5. 5.Which job needs a light sensor? (a) measure a turn angle (b) measure how far a box is (c) find the brightest spot (d) know a button is pressed
6. 6.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
7. 7.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
8. 8.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
9. 9.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a white surface (d) a black line
10. 10.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 4 (d) 3
11. 11.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
12. 12.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) north (b) east (c) south (d) west
13. 13.🛞 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)?
14. 14.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.⬛ 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 hot (d) black is loud
16. 16.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
17. 17.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
19. 19.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
20. 20.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) spins right on the spot (b) stays still (c) turns left (d) turns right
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
22. 22.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
23. 23.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 180° (d) 90°
24. 24.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points straight up (c) points right (d) points up and right
25. 25.🧭 A robot faces east. It does: turn left, turn right, turn around, turn left. Which way does it face now? (a) north (b) south (c) east (d) west
26. 26.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 35. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
28. 28.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
29. 29.Which of these suits legs? (a) a muddy building site (b) crossing stepping-stones (c) soft snow (d) a flat road
30. 30.🔍 Which sensor helps a robot start on a hand clap? (a) a camera (b) a sound sensor (c) a distance sensor (d) a light sensor
31. 31.Which job needs a gyro sensor? (a) know a button is pressed (b) stay balanced upright (c) warn if motors get hot (d) measure how far a box is
32. 32.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
33. 33.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
34. 34.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
35. 35.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 63. What is under the sensor? (a) the black line (b) the white floor
37. 37.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) between the two sensors (d) under the left sensor
38. 38.🦾 A servo moves from 40° to 90°. How many degrees does it turn?
39. 39.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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