Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 270 · 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 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
2. 2.⬛ The threshold of a light sensor is … (a) the battery size (b) the wheel size (c) the black/white cut-off (d) the top speed
3. 3.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
4. 4.🧭 A robot faces south. It does: turn right, turn left. Which way does it face now? (a) west (b) east (c) south (d) north
5. 5.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
6. 6.Which job needs a sound sensor? (a) measure a turn angle (b) know a button is pressed (c) stop before a wall (d) start on a hand clap
7. 7.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they spread the weight (c) they are shiny (d) they are round
8. 8.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) turn by exact angles (d) hear claps
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
10. 10.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
11. 11.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
14. 14.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 360° (d) 100°
15. 15.⚙️ 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
16. 16.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
17. 17.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
18. 18.Which job needs a touch sensor? (a) follow a black line (b) feel a bump into a wall (c) stop before a wall (d) find the brightest spot
19. 19.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 45° (d) 360°
20. 20.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
21. 21.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
23. 23.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
24. 24.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
25. 25.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
26. 26.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
27. 27.🧭 A robot spins 15° every second. How many seconds does it take to turn 135°?
28. 28.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
29. 29.🧭 A robot should turn right 90°, but its gyro shows it turned 76°. How many degrees must it turn more to the right?
30. 30.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
31. 31.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a sound sensor (c) a gyro sensor (d) a touch sensor
32. 32.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
33. 33.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
35. 35.Which job needs a temperature sensor? (a) know a button is pressed (b) follow a black line (c) warn if motors get hot (d) spot a red ball
36. 36.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
37. 37.🦾 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 straight up (b) points up and right (c) points left (d) points up and left
38. 38.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
39. 39.📡 A robot is 110 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
40. 40.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear

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