Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 39 · 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 should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
2. 2.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
3. 3.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
4. 4.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
5. 5.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
6. 6.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
7. 7.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
10. 10.Which job needs a gyro sensor? (a) feel a bump into a wall (b) hear a whistle (c) measure a turn angle (d) measure how far a box is
11. 11.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
13. 13.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
15. 15.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a gear (c) a track (d) a servo
16. 16.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to use more power (d) to know their world
17. 17.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
18. 18.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 26 seconds (in cm)?
19. 19.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
21. 21.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
23. 23.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
26. 26.Which of these suits tracks? (a) hovering over a roof (b) stepping over wide gaps (c) loose sand dunes (d) moving under water
27. 27.🧭 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 60°, then right 45°, then left 90°. What does the gyro read now (0° to 359°)?
28. 28.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
33. 33.🛞 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 forward. What does the robot do? (a) spins right on the spot (b) goes straight back (c) goes straight forward (d) stays still
34. 34.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
35. 35.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
36. 36.🧭 What does a gyro help a robot do? (a) smell smoke (b) hear claps (c) turn by exact angles (d) see colours
37. 37.True or false: “a muddy building site” suits tracks. (a) False (b) True
38. 38.Which of these suits wheels? (a) soft snow (b) a flat road (c) hovering over a roof (d) loose sand dunes
39. 39.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) driver gear (d) tyre
40. 40.Which job needs a distance sensor? (a) spot a red ball (b) read a QR code (c) measure how far a box is (d) feel a bump into a wall

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