Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 302 · 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 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
2. 2.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
4. 4.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.Which job needs a light sensor? (a) hear a whistle (b) stop before a wall (c) follow a black line (d) know a button is pressed
7. 7.🦾 A servo moves from 70° to 90°. How many degrees does it turn?
8. 8.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
9. 9.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
10. 10.Which of these suits legs? (a) a flat road (b) a muddy building site (c) crossing stepping-stones (d) loose sand dunes
11. 11.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a gear (d) a wheel
12. 12.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.🧭 A robot spins 30° every second. How many seconds does it take to turn 270°?
14. 14.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 47. What is under the sensor? (a) the black line (b) the white floor
15. 15.True or false: “a muddy building site” suits legs. (a) True (b) False
16. 16.🧭 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 0°. It turns right 180°, then right 45°, then right 180°. What does the gyro read now (0° to 359°)?
17. 17.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a wooden box (d) a metal door
18. 18.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) tyre (c) idler gear (d) driver gear
19. 19.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a camera (c) a light sensor (d) a distance sensor
20. 20.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
21. 21.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 360° (d) 90°
22. 22.Which job needs a gyro sensor? (a) warn if motors get hot (b) follow a black line (c) know a button is pressed (d) stay balanced upright
23. 23.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
24. 24.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) not at all (d) slower but stronger
25. 25.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
26. 26.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
27. 27.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
28. 28.Which of these suits tracks? (a) stepping over wide gaps (b) soft snow (c) flying over a field (d) a flat road
29. 29.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
30. 30.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points straight up (b) points right (c) points up and left (d) points up and right
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
32. 32.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
33. 33.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
34. 34.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 180° (d) 360°
35. 35.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
36. 36.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its circumference (d) its weight
37. 37.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
38. 38.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) pins (d) teeth
39. 39.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.⚙️ A 12-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower

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