Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 5 · 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 job needs a light sensor? (a) follow a black line (b) spot a red ball (c) hear a whistle (d) know a button is pressed
2. 2.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
3. 3.Which of these suits wheels? (a) a muddy building site (b) a field of tall boulders (c) a hospital corridor (d) moving under water
4. 4.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
5. 5.Which job needs a distance sensor? (a) follow a black line (b) know a button is pressed (c) measure a turn angle (d) stop before a wall
6. 6.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
7. 7.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) water (d) white
8. 8.True or false: to measure a turn angle, use a gyro sensor. (a) True (b) False
9. 9.Which of these suits tracks? (a) a long factory floor (b) loose sand dunes (c) hovering over a roof (d) crossing stepping-stones
10. 10.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times faster (d) 3 times louder
11. 11.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a dark tunnel (d) a white surface
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
13. 13.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) slower but stronger (c) faster and weaker (d) not at all
14. 14.🦾 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 left (b) points up and right (c) points up and left (d) points right
15. 15.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
16. 16.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) big (slow and strong) (d) small (fast, weak)
17. 17.Which of these suits tracks? (a) moving under water (b) a muddy building site (c) stepping over wide gaps (d) a hospital corridor
18. 18.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
19. 19.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black soaks up light (d) black is loud
20. 20.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
21. 21.📡 A robot is 180 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 2 seconds (in cm)?
22. 22.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
23. 23.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 45° (d) 180°
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 54. What is under the sensor? (a) the black line (b) the white floor
26. 26.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
27. 27.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 62. What is under the sensor? (a) the white floor (b) the black line
28. 28.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
29. 29.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
32. 32.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
34. 34.🧭 A robot should turn right 90°, but its gyro shows it turned 95°. How many degrees must it turn back to the left?
35. 35.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
36. 36.Which job needs a sound sensor? (a) warn if motors get hot (b) follow a black line (c) know a button is pressed (d) start on a hand clap
37. 37.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
38. 38.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 45. What is under the sensor? (a) the black line (b) the white floor
39. 39.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
40. 40.🧭 A robot should turn right 45°, but its gyro shows it turned 55°. How many degrees must it turn back to the left?

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