Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 920 · 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 robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
2. 2.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
3. 3.🧭 A robot should turn right 90°, but its gyro shows it turned 76°. How many degrees must it turn more to the right?
4. 4.Which job needs a distance sensor? (a) find the brightest spot (b) hear a whistle (c) measure a turn angle (d) measure how far a box is
5. 5.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) turns right (d) spins left on the spot
6. 6.True or false: “hovering over a roof” suits legs. (a) False (b) True
7. 7.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) propellers (c) legs (d) tracks
8. 8.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
9. 9.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points straight up
10. 10.True or false: “crossing stepping-stones” suits legs. (a) True (b) False
11. 11.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) they never tire (d) harder to balance
12. 12.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
13. 13.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) wheels (c) tracks (d) legs
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
15. 15.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
16. 16.Which job needs a sound sensor? (a) start on a hand clap (b) stay balanced upright (c) measure how far a box is (d) stop before a wall
17. 17.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
18. 18.🧭 A robot faces west. It does: turn left, turn right. Which way does it face now? (a) east (b) north (c) south (d) west
19. 19.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) it goes there and back (d) sound is slow
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
21. 21.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
22. 22.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
23. 23.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times louder (d) 3 times bigger
24. 24.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 54. What is under the sensor? (a) the white floor (b) the black line
25. 25.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a gyro sensor
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
27. 27.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🧭 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 180°. It turns left 90°, then right 90°, then left 45°. What does the gyro read now (0° to 359°)?
29. 29.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
30. 30.🔍 Which sensor helps a robot measure how far a box is? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a touch sensor
31. 31.⚙️ 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 big driver gear (b) a small driver gear
32. 32.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
33. 33.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 360° (c) 90° (d) 180°
34. 34.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
35. 35.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
36. 36.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it uses a sail (c) one wheel runs faster (d) it jumps
37. 37.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a camera (c) a sound sensor (d) a temperature sensor
38. 38.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
39. 39.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
40. 40.🦾 A servo moves from 130° to 180°. How many degrees does it turn?

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